Pub Date : 2022-01-01DOI: 10.30791/1028-978x-2022-12-5-11
S. Muslov, A. Lotkov, P. Sukhochev
In this paper, to analyze the elastic properties of Ti49Ni51 (at. %) and TiNi – TiFe crystals with and without martensitic transformations Every’s and Blackman’s diagrams are used as two ways to characterize the elastic properties of cubic materials. Paired correlations between the parameters (s2, s3), (s3, s1) и (F44, F12) are calculated. The evolution of the Cauchy pressure pC value depending on the content of iron atoms in the crystal lattice of alloys is considered. It is established that, regardless of the composition of the alloys, the Cauchy pressure is greater than zero and decreases almost monotonically from 100.5 to 35.0 GPa with an increase in the content of Fe atoms in the B2 crystal lattice of the TiNi – TiFe phase and an increase in its stability with respect to martensitic transformations (up to complete stabilization). This evolution of pC corresponds to the data according to which a significant component of the bonding forces in TiNi is a metallic bond, and with an increase in the concentration of Fe atoms in alloys instead of Ni atoms and approaching the composition of TiFe, the proportion of the covalent component of the bonding forces increases.
{"title":"Every, Blackman diagrams, Cauchy pressure and analysis of elastic properties of the crystal lattice of Ti49Ni51 (at. %) and TiNi – TiFe alloys with and without martensitic transformations","authors":"S. Muslov, A. Lotkov, P. Sukhochev","doi":"10.30791/1028-978x-2022-12-5-11","DOIUrl":"https://doi.org/10.30791/1028-978x-2022-12-5-11","url":null,"abstract":"In this paper, to analyze the elastic properties of Ti49Ni51 (at. %) and TiNi – TiFe crystals with and without martensitic transformations Every’s and Blackman’s diagrams are used as two ways to characterize the elastic properties of cubic materials. Paired correlations between the parameters (s2, s3), (s3, s1) и (F44, F12) are calculated. The evolution of the Cauchy pressure pC value depending on the content of iron atoms in the crystal lattice of alloys is considered. It is established that, regardless of the composition of the alloys, the Cauchy pressure is greater than zero and decreases almost monotonically from 100.5 to 35.0 GPa with an increase in the content of Fe atoms in the B2 crystal lattice of the TiNi – TiFe phase and an increase in its stability with respect to martensitic transformations (up to complete stabilization). This evolution of pC corresponds to the data according to which a significant component of the bonding forces in TiNi is a metallic bond, and with an increase in the concentration of Fe atoms in alloys instead of Ni atoms and approaching the composition of TiFe, the proportion of the covalent component of the bonding forces increases.","PeriodicalId":20003,"journal":{"name":"Perspektivnye Materialy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87438302","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.30791/1028-978x-2022-7-25-34
M. Kalinina, N. Y. Fedorenko, M. Rubina, D. Suslov, Y. Andozhskaya, L. N. Efimova, O. Shilova
Nanodispersed xerogels and powders (average size 9 nm) were obtained by co-precipitation of hydroxides in the ZrO2–Y2O3–Al2O3. Solid-state sintering of samples from the initial [(ZrO2)0,97(Y2O3)0,03]0,8(Al2O3)0,2 powder with pore-forming additives using a patented technology strong highly porous ceramics was produced. Dopplerography was used to assess the volume of blood flow in arterioles and capillaries on 150 and 250 days after implantation of the plates. Thus, microcirculatory Doppler sonography seems to be a promising intravital method for assessing blood flow in the plate location area and, possibly, inside the plate. It was found that ceramic plates based on zirconium dioxide, placed in the body of experimental animals, do not cause a negative reaction of the animal’s body. The results of studies under in vivo conditions suggest that the obtained bioceramic based on zirconium dioxide is promising for use as a material for endo-prosthetics.
{"title":"Influence of high porous ceramic material-implant based on ZrO2–Y2O3–Al2O3 system on life activity","authors":"M. Kalinina, N. Y. Fedorenko, M. Rubina, D. Suslov, Y. Andozhskaya, L. N. Efimova, O. Shilova","doi":"10.30791/1028-978x-2022-7-25-34","DOIUrl":"https://doi.org/10.30791/1028-978x-2022-7-25-34","url":null,"abstract":"Nanodispersed xerogels and powders (average size 9 nm) were obtained by co-precipitation of hydroxides in the ZrO2–Y2O3–Al2O3. Solid-state sintering of samples from the initial [(ZrO2)0,97(Y2O3)0,03]0,8(Al2O3)0,2 powder with pore-forming additives using a patented technology strong highly porous ceramics was produced. Dopplerography was used to assess the volume of blood flow in arterioles and capillaries on 150 and 250 days after implantation of the plates. Thus, microcirculatory Doppler sonography seems to be a promising intravital method for assessing blood flow in the plate location area and, possibly, inside the plate. It was found that ceramic plates based on zirconium dioxide, placed in the body of experimental animals, do not cause a negative reaction of the animal’s body. The results of studies under in vivo conditions suggest that the obtained bioceramic based on zirconium dioxide is promising for use as a material for endo-prosthetics.","PeriodicalId":20003,"journal":{"name":"Perspektivnye Materialy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85585321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.30791/1028-978x-2022-3-24-35
K. V. Antipov, I. Benarieb, Y. S. Oglodkova, A. Rudchenko
The results of comprehensive studies of a set of properties of experimental-industrial sheets and extruded profiles made of a new aluminum alloy V-1381 Al – Mg – Si – Cu systems (6xxxx series) are presented in the article. The alloy has shown high manufacturability in industrial production under extrusion, as well as in hot and cold rolling. Using the Thermo-Calc software package, the quenching mode of semi-finished products was selected, as well as the modes of artificial aging modes were investigated. It is shown that the alloy V-1381T1 is not inferior in its mechanical properties to the foreign analogue alloy AA6013, is characterized by a good combination of mechanical properties at room temperature (σu ≥ 380 MPa, σ0.2 ≥ 360 MPa, δ5 ≥ 13 %) and elevated temperatures, exceeds the widely used alloy D16chT in yield strength by 20%, while possessing a lower density, better corrosion resistance and ability to obtain welded joints. The new alloy V-1381 can be recommended for use in fuselage structural elements of aviation equipment, including replacing less corrosion-resistant non-welded alloys of the D16 type, which will increase the weight efficiency of the structure both due to increased strength and due to the replacement of riveted joints withwelded ones.
本文介绍了一种新型铝合金V-1381 Al - Mg - Si - Cu系(6xxxx系列)的实验-工业板材和挤压型材的一系列性能的综合研究结果。在工业生产中，该合金在挤压、冷轧和热轧条件下均表现出较高的可加工性。利用heat - calc软件选择了半成品的淬火方式，并对人工时效方式进行了研究。结果表明:V-1381T1合金的力学性能不逊于国外同类合金AA6013，具有良好的室温力学性能(σu≥380 MPa， σ0.2≥360 MPa， δ5≥13 %)与高温力学性能的结合，屈服强度比广泛使用的合金D16chT高20%，同时具有较低的密度、较好的耐腐蚀性和获得焊接接头的能力。新合金V-1381可以推荐用于航空设备的机身结构元件，包括取代抗腐蚀性较差的D16型非焊接合金，这将增加结构的重量效率，因为增加了强度，并且由于用焊接接头代替了铆接接头。
{"title":"Structure and properties of industrial semi-products of weldable corrosion-resistant Al – Mg – Si – Cu system aluminum alloy","authors":"K. V. Antipov, I. Benarieb, Y. S. Oglodkova, A. Rudchenko","doi":"10.30791/1028-978x-2022-3-24-35","DOIUrl":"https://doi.org/10.30791/1028-978x-2022-3-24-35","url":null,"abstract":"The results of comprehensive studies of a set of properties of experimental-industrial sheets and extruded profiles made of a new aluminum alloy V-1381 Al – Mg – Si – Cu systems (6xxxx series) are presented in the article. The alloy has shown high manufacturability in industrial production under extrusion, as well as in hot and cold rolling. Using the Thermo-Calc software package, the quenching mode of semi-finished products was selected, as well as the modes of artificial aging modes were investigated. It is shown that the alloy V-1381T1 is not inferior in its mechanical properties to the foreign analogue alloy AA6013, is characterized by a good combination of mechanical properties at room temperature (σu ≥ 380 MPa, σ0.2 ≥ 360 MPa, δ5 ≥ 13 %) and elevated temperatures, exceeds the widely used alloy D16chT in yield strength by 20%, while possessing a lower density, better corrosion resistance and ability to obtain welded joints. The new alloy V-1381 can be recommended for use in fuselage structural elements of aviation equipment, including replacing less corrosion-resistant non-welded alloys of the D16 type, which will increase the weight efficiency of the structure both due to increased strength and due to the replacement of riveted joints withwelded ones.","PeriodicalId":20003,"journal":{"name":"Perspektivnye Materialy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78748514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.30791/1028-978x-2022-1-48-54
A. G. Meilakh, Yu. V. Kontsevoy, E. Y. Goida, A. Shubin
By pressing, rolling and sintering, a composite material (CM) based on copper powder clad with Fe-Cu pseudo-alloy (PA) was created for the working layer of two-layer ruptured electrical contacts. Powder of activated carbon (CA) with a surface of 1000 m2/g served as the arc suppression component. Highly dispersed powders of Al2O3, Fe2Al5, and Fe were also used as additional components. Experimental linear dependences of the conductivity and hardness of copper-based composites on the concentration of individual functional additives have been established. With the addition of mixtures of additional components, CMs were obtained for the working layer of the contact with the following characteristics: electrical resistance — 3.2 – 4.5 μOhm·cm, hardness HB — 790 – 1030 MPa. For a given conductivity of a two-layer contact, which is ≥ 75 % of the conductivity of copper, the dependence of the maximum allowable resistivity of theworking layer (ρ) on the ratio of its thickness to the thickness of the copper layer is calculated. The optimal chemical composition of the working layer of the contact has been determined — 97 % Cu + 1 % CA + 2 % PA, providing high hardness 1030 MPa and electrical resistance 3.2 μOhm·cm. These characteristics allow creating an electrical contact with a ratio of the thickness of the working and copper layer equal to 1:1.
通过压制、轧制和烧结，制备了一种基于铜粉包覆Fe-Cu伪合金(PA)的复合材料(CM)，用于两层断裂电触点的工作层。活性炭粉(CA)的表面为1000 m2/g，作为灭弧组分。高分散的Al2O3、Fe2Al5和Fe粉末也被用作附加组分。建立了铜基复合材料的电导率和硬度随各功能添加剂浓度的线性关系。通过添加其他组分的混合物，获得了电阻为3.2 ~ 4.5 μOhm·cm，硬度HB为790 ~ 1030 MPa的接触面工作层cm。对于给定的两层接触的电导率≥铜电导率的75%，计算了工作层的最大允许电阻率(ρ)与其厚度与铜层厚度之比的依赖关系。确定了触点工作层的最佳化学成分- 97% Cu + 1 % CA + 2% PA，具有较高的硬度1030 MPa和电阻3.2 μOhm·cm。这些特性使工作层和铜层厚度的比例等于1:1的电接触成为可能。
{"title":"Electro-contact material based on copper powder clad with Fe – Cu pseudo-alloy","authors":"A. G. Meilakh, Yu. V. Kontsevoy, E. Y. Goida, A. Shubin","doi":"10.30791/1028-978x-2022-1-48-54","DOIUrl":"https://doi.org/10.30791/1028-978x-2022-1-48-54","url":null,"abstract":"By pressing, rolling and sintering, a composite material (CM) based on copper powder clad with Fe-Cu pseudo-alloy (PA) was created for the working layer of two-layer ruptured electrical contacts. Powder of activated carbon (CA) with a surface of 1000 m2/g served as the arc suppression component. Highly dispersed powders of Al2O3, Fe2Al5, and Fe were also used as additional components. Experimental linear dependences of the conductivity and hardness of copper-based composites on the concentration of individual functional additives have been established. With the addition of mixtures of additional components, CMs were obtained for the working layer of the contact with the following characteristics: electrical resistance — 3.2 – 4.5 μOhm·cm, hardness HB — 790 – 1030 MPa. For a given conductivity of a two-layer contact, which is ≥ 75 % of the conductivity of copper, the dependence of the maximum allowable resistivity of theworking layer (ρ) on the ratio of its thickness to the thickness of the copper layer is calculated. The optimal chemical composition of the working layer of the contact has been determined — 97 % Cu + 1 % CA + 2 % PA, providing high hardness 1030 MPa and electrical resistance 3.2 μOhm·cm. These characteristics allow creating an electrical contact with a ratio of the thickness of the working and copper layer equal to 1:1.","PeriodicalId":20003,"journal":{"name":"Perspektivnye Materialy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73796443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.30791/1028-978x-2022-12-43-56
M. Ostapenko, V. Semin, A. A. Neiman, F. D’yachenko, L. Meisner
TiNi shape memory alloys exhibiting martensitic transformations are attractive materials in the industry of micromechanical systems. The key issue responsible for degradation of functional properties of TiNi during operation is residual stresses arising from the sample processing and surface treatments. In this work, we investigated TiNi substrates modified after synthesis of Ti – Ni – Ta – Si surface alloys (SA) by additive thin film electron-beam (ATF-EB) method. The effect of electron-beam treatments of the system “[Ti – Ni – Ta – Si]SA/TiNi substrate” at the energy density (ES = 1.7 J/cm2) and pulse number n = 10 on the elastic-stress state of the B2 phase in TiNi substrate has been studied. Detailed analysis by X-ray diffraction (XRD) and transmission electron microscopy (TEM) has shown the formation of two isostructured B2 phases with different lattice parameters, chemical composition, and microstructure. It has been found that changes in the B2 lattice parameters are closely related to the variation of the chemical composition and residual elastic stresses of the first kind. The study of residual stresses in the samples reveals that compression stresses in the direction perpendicular to the irradiated surface reach a value of –350 MPa. After additional electron-beam treatment, the compression stress value decreases to –270 MPa.
以马氏体相变为特征的TiNi形状记忆合金是微机械系统中极具吸引力的材料。在操作过程中，导致TiNi功能性能退化的关键问题是样品加工和表面处理产生的残余应力。本文研究了用薄膜电子束(ATF-EB)法合成Ti - Ni - Ta - Si表面合金(SA)后对TiNi衬底进行改性的方法。研究了能量密度(ES = 1.7 J/cm2)、脉冲数n = 10的“[Ti - Ni - Ta - Si]SA/TiNi衬底”体系电子束处理对TiNi衬底中B2相弹性应力态的影响。通过x射线衍射(XRD)和透射电子显微镜(TEM)的详细分析表明，形成了两种具有不同晶格参数、化学成分和微观结构的等结构B2相。研究发现，B2晶格参数的变化与化学成分和第一类残余弹性应力的变化密切相关。样品残余应力的研究表明，垂直于辐照表面方向的压缩应力达到-350 MPa。经过额外的电子束处理后，压缩应力值降至-270 MPa。
{"title":"Effect of electron-beam treatments on the level and evolution of residual stresses in the “surface Ti – Ni – Ta – Si alloy/TiNi-substrate” system","authors":"M. Ostapenko, V. Semin, A. A. Neiman, F. D’yachenko, L. Meisner","doi":"10.30791/1028-978x-2022-12-43-56","DOIUrl":"https://doi.org/10.30791/1028-978x-2022-12-43-56","url":null,"abstract":"TiNi shape memory alloys exhibiting martensitic transformations are attractive materials in the industry of micromechanical systems. The key issue responsible for degradation of functional properties of TiNi during operation is residual stresses arising from the sample processing and surface treatments. In this work, we investigated TiNi substrates modified after synthesis of Ti – Ni – Ta – Si surface alloys (SA) by additive thin film electron-beam (ATF-EB) method. The effect of electron-beam treatments of the system “[Ti – Ni – Ta – Si]SA/TiNi substrate” at the energy density (ES = 1.7 J/cm2) and pulse number n = 10 on the elastic-stress state of the B2 phase in TiNi substrate has been studied. Detailed analysis by X-ray diffraction (XRD) and transmission electron microscopy (TEM) has shown the formation of two isostructured B2 phases with different lattice parameters, chemical composition, and microstructure. It has been found that changes in the B2 lattice parameters are closely related to the variation of the chemical composition and residual elastic stresses of the first kind. The study of residual stresses in the samples reveals that compression stresses in the direction perpendicular to the irradiated surface reach a value of –350 MPa. After additional electron-beam treatment, the compression stress value decreases to –270 MPa.","PeriodicalId":20003,"journal":{"name":"Perspektivnye Materialy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77893444","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.30791/1028-978x-2022-10-64-82
I. Krylov, N. Korneeva, V. Kudinov
An universal method “Break upon Impact and Static” (RUS) has been developed for the experimental determination of the ultimate strength properties of polymer composite materials based on multifilament nanocrystalline ultra-high molecular weight polyethylene (UHMWPE) fibers, which differs in the method of fixing the sample in a testing machine.The method is carried out using a uniform BIS-sample with an intermediate matrix at the ends and equipment for its attachment to the platforms of testing machines. The sample is a round composite rod composed of the fibers and matrices under investigation, which is held in the tooling by an additional matrix that fixtures it under various loading rates. The RUS method was used to study the properties and mechanisms of destruction upon impact and in a static situation of anisotropic polymer and hybrid composite materials (PCM and HCM) based on flexible and rigid matrices reinforced with hybrid fibers of carbon, aramid, and UHMWPE-fibers activated by non-equilibrium low-temperature plasma. The breaking loads under low-velocity impact and static bending conditions, relative deformation, specific absorbed-in-fracture energy, work of adhesion, shear strength, and other properties are determined. It was found out that the plasticity of the matrix and the hybrid fiber composition affect the properties and fracture mode of PCM and HCM. For the destruction of HCM with a flexible matrix upon impact, a load twice as large as for composites with a rigid matrix is required. HCMs have the highest strength, in which at all stages of loading up to failure, joint deformation of the matrix and the reinforcing fiber occurs. The mechanism of deformation and destruction of anisotropic HCM upon impact is stepwise, while the nature of the deformation curve is zigzag. In statics, the deformation proceeds smoothly. By changing the ratio of carbon and UHMWPE-fibers during hybridization, it is possible to control the properties of HCM and improve its specific properties. The combination of carbon and UHMWPE-fibers in a hybrid fiber for reinforcing a flexible matrix makes it possible to create a material with a delayed fracture. It has been established that for HCM based on a flexible matrix reinforced with a hybrid fiber combining 20 % carbon and 80 % UHMWPE fiber, the fracture load increases by factor 2, the specific fracture work by 42 %, relative deformation by 68 %.
{"title":"Influence of rigid and flexible matrices on ultimate strength and fracture mechanisms of polymer composite materials upon impact and static loading conditions","authors":"I. Krylov, N. Korneeva, V. Kudinov","doi":"10.30791/1028-978x-2022-10-64-82","DOIUrl":"https://doi.org/10.30791/1028-978x-2022-10-64-82","url":null,"abstract":"An universal method “Break upon Impact and Static” (RUS) has been developed for the experimental determination of the ultimate strength properties of polymer composite materials based on multifilament nanocrystalline ultra-high molecular weight polyethylene (UHMWPE) fibers, which differs in the method of fixing the sample in a testing machine.The method is carried out using a uniform BIS-sample with an intermediate matrix at the ends and equipment for its attachment to the platforms of testing machines. The sample is a round composite rod composed of the fibers and matrices under investigation, which is held in the tooling by an additional matrix that fixtures it under various loading rates. The RUS method was used to study the properties and mechanisms of destruction upon impact and in a static situation of anisotropic polymer and hybrid composite materials (PCM and HCM) based on flexible and rigid matrices reinforced with hybrid fibers of carbon, aramid, and UHMWPE-fibers activated by non-equilibrium low-temperature plasma. The breaking loads under low-velocity impact and static bending conditions, relative deformation, specific absorbed-in-fracture energy, work of adhesion, shear strength, and other properties are determined. It was found out that the plasticity of the matrix and the hybrid fiber composition affect the properties and fracture mode of PCM and HCM. For the destruction of HCM with a flexible matrix upon impact, a load twice as large as for composites with a rigid matrix is required. HCMs have the highest strength, in which at all stages of loading up to failure, joint deformation of the matrix and the reinforcing fiber occurs. The mechanism of deformation and destruction of anisotropic HCM upon impact is stepwise, while the nature of the deformation curve is zigzag. In statics, the deformation proceeds smoothly. By changing the ratio of carbon and UHMWPE-fibers during hybridization, it is possible to control the properties of HCM and improve its specific properties. The combination of carbon and UHMWPE-fibers in a hybrid fiber for reinforcing a flexible matrix makes it possible to create a material with a delayed fracture. It has been established that for HCM based on a flexible matrix reinforced with a hybrid fiber combining 20 % carbon and 80 % UHMWPE fiber, the fracture load increases by factor 2, the specific fracture work by 42 %, relative deformation by 68 %.","PeriodicalId":20003,"journal":{"name":"Perspektivnye Materialy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73900554","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.30791/1028-978x-2022-10-31-34
A. G. Tarasov, V. Veretennikov
The article presents the results of experimental studying of corrosion resistance of corundum, titanium nitride and TiB2/TiNi powder samples in supercritical aqueous fluid (SAF). The tests were proceeded in autoclave (temperature of 400 °C, steam pressure of 100 MPa) during 100 hours. As a result, it was found that Al2O3 (corundum) and TiN are resistant materials, whereas the TiB2 phase of eutectic alloy dissolves in an aqueous SAF medium. Deep corrosion index value is considered.
{"title":"Corrosion resistance test of powders of corundum, titanium nitride, and TiB2/TiN eutectic composition alloy in the supercritical aqueous fluid","authors":"A. G. Tarasov, V. Veretennikov","doi":"10.30791/1028-978x-2022-10-31-34","DOIUrl":"https://doi.org/10.30791/1028-978x-2022-10-31-34","url":null,"abstract":"The article presents the results of experimental studying of corrosion resistance of corundum, titanium nitride and TiB2/TiNi powder samples in supercritical aqueous fluid (SAF). The tests were proceeded in autoclave (temperature of 400 °C, steam pressure of 100 MPa) during 100 hours. As a result, it was found that Al2O3 (corundum) and TiN are resistant materials, whereas the TiB2 phase of eutectic alloy dissolves in an aqueous SAF medium. Deep corrosion index value is considered.","PeriodicalId":20003,"journal":{"name":"Perspektivnye Materialy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80038047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.30791/1028-978x-2022-7-49-57
N. P. Burkovskaya, N. V. Sevostyanov, F. N. Karachevtsev, P. Medvedev
Data on high-temperature tests for heat resistance of copper-nickel-based powder materials synthesized by spark plasma sintering (SPS) are presents. The features of oxidation of copper-nickel alloys with various alloying elements at temperatures above 1000 °C have been studied. Based on the research results, the dependence of the growth rate of the oxide film on the high-temperature oxidation temperature was established, and the influence of alloying elements in the composition of sintered copper-nickel alloys on their heat resistance was considered. It is shown that the highest heat resistance is provided by alloying copper-nickel alloys with aluminum and chromium. For all considered compositions of copper-nickel alloys synthesized by spark plasma sintering, the temperature point of 1100 °C during a 20-hour heat resistance test is the limiting one, since most of the samples are completely destroyed. The scale growth rate for composition Cu – Ni – Cr – Al 1.49·10–3 g/cm3 is lower than the oxidation rate of pure nickel 3.78·10–3 g/cm3 at 1000 °C and these two samples demonstrate the lowest weight gain after testing at 1000 °С. For compositions Cu – Ni, Cu – Ni – Cr – C(graphite) and Cu – Ni – Al the oxidation rate increases by two orders of magnitude, for compositions Cu – Ni – Cr and Cu – Ni – Cr – Si — by three orders of magnitude. Despite increase of test temperature up to 1100 °C, the rate of scale growth on the surface of Cu – Ni – Cr and Cu – Ni – Al specimens remain practically unchanged: 124.01·10–3 and 210.43·10–3 g/cm3 at 1000 °C; 153.44·10–3 and 203.87·10–3 g/cm3 at 1100 °C. Deceleration of the oxidation kinetics of these samples with temperature increase is ensured by formation of oxide film on the surface, which has a dense structure with good adhesion to the basic material.
介绍了用火花等离子烧结(SPS)法制备的铜镍基粉末材料的耐热性高温试验数据。研究了不同合金元素在1000 ℃以上温度下铜镍合金的氧化特性。在此基础上，建立了氧化膜生长速率与高温氧化温度的关系，并考虑了烧结铜镍合金成分中合金元素对其耐热性的影响。结果表明，铜镍合金与铝和铬合金的耐热性最高。对于火花等离子烧结合成的所有铜镍合金成分，在20小时的耐热性测试中，1100℃的温度点是极限温度点，因为大多数样品已经完全破坏。在1000℃下，Cu - Ni - Cr - Al组分的氧化速率为1.49·10-3 g/cm3，低于纯镍的氧化速率3.78·10-3 g/cm3，在1000℃С下测试后，这两种样品的增重最小。对于组合物Cu - Ni、Cu - Ni - Cr - C(石墨)和Cu - Ni - Al，氧化速率提高了2个数量级，对于组合物Cu - Ni - Cr和Cu - Ni - Cr - Si，氧化速率提高了3个数量级。当温度升高到1100℃时，Cu - Ni - Cr和Cu - Ni - Al试样表面的水垢生长速率基本保持不变，在1000℃时分别为124.01·10-3和210.43·10-3 g/cm3;在1100℃时分别为153.44·10-3和203.87·10-3 g/cm3。随着温度的升高，这些样品的氧化动力学减慢是通过在表面形成氧化膜来保证的，氧化膜具有致密的结构，与基本材料有良好的附着力。
{"title":"Features of oxidation of copper-nickel alloys synthesized by spark plasma sintering","authors":"N. P. Burkovskaya, N. V. Sevostyanov, F. N. Karachevtsev, P. Medvedev","doi":"10.30791/1028-978x-2022-7-49-57","DOIUrl":"https://doi.org/10.30791/1028-978x-2022-7-49-57","url":null,"abstract":"Data on high-temperature tests for heat resistance of copper-nickel-based powder materials synthesized by spark plasma sintering (SPS) are presents. The features of oxidation of copper-nickel alloys with various alloying elements at temperatures above 1000 °C have been studied. Based on the research results, the dependence of the growth rate of the oxide film on the high-temperature oxidation temperature was established, and the influence of alloying elements in the composition of sintered copper-nickel alloys on their heat resistance was considered. It is shown that the highest heat resistance is provided by alloying copper-nickel alloys with aluminum and chromium. For all considered compositions of copper-nickel alloys synthesized by spark plasma sintering, the temperature point of 1100 °C during a 20-hour heat resistance test is the limiting one, since most of the samples are completely destroyed. The scale growth rate for composition Cu – Ni – Cr – Al 1.49·10–3 g/cm3 is lower than the oxidation rate of pure nickel 3.78·10–3 g/cm3 at 1000 °C and these two samples demonstrate the lowest weight gain after testing at 1000 °С. For compositions Cu – Ni, Cu – Ni – Cr – C(graphite) and Cu – Ni – Al the oxidation rate increases by two orders of magnitude, for compositions Cu – Ni – Cr and Cu – Ni – Cr – Si — by three orders of magnitude. Despite increase of test temperature up to 1100 °C, the rate of scale growth on the surface of Cu – Ni – Cr and Cu – Ni – Al specimens remain practically unchanged: 124.01·10–3 and 210.43·10–3 g/cm3 at 1000 °C; 153.44·10–3 and 203.87·10–3 g/cm3 at 1100 °C. Deceleration of the oxidation kinetics of these samples with temperature increase is ensured by formation of oxide film on the surface, which has a dense structure with good adhesion to the basic material.","PeriodicalId":20003,"journal":{"name":"Perspektivnye Materialy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86589676","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.30791/1028-978x-2022-7-5-13
A. Gradoboev, K. N. Orlova, V. V. Sednev, F. Zhamaldinov
The paper presents results of a study of the influence of active and passive power modes on the resistance to gamma-quantum irradiation of the LED manufactured on the basis of AlGaAs multilayer heterostructures. Three characteristic stages of radiation power reduction are distinguished for the studied LEDs irrespective of irradiation supply mode. In this case, the second stage is described by a higher damage factor and the third stage is distinguished by the appearance of catastrophic failures. Two differently directed processes of radiation power variation are observed during the irradiation of LED in active modes. It is supposed that the first process is caused by the power reduction of LED emission due to the injection of the corresponding radiation defects. The second process is caused by a partial recovery of the emission power due to radiation, radiation-thermal, and/or electrostimulated annealing of a portion of the defects created. The observed recovery of the radiation power in the active supply mode of the LEDs during irradiation significantly increases their resistance to gamma-quantum irradiation.
{"title":"Influence of the power supply mode of leds on the resistance to exposure to gamma quants","authors":"A. Gradoboev, K. N. Orlova, V. V. Sednev, F. Zhamaldinov","doi":"10.30791/1028-978x-2022-7-5-13","DOIUrl":"https://doi.org/10.30791/1028-978x-2022-7-5-13","url":null,"abstract":"The paper presents results of a study of the influence of active and passive power modes on the resistance to gamma-quantum irradiation of the LED manufactured on the basis of AlGaAs multilayer heterostructures. Three characteristic stages of radiation power reduction are distinguished for the studied LEDs irrespective of irradiation supply mode. In this case, the second stage is described by a higher damage factor and the third stage is distinguished by the appearance of catastrophic failures. Two differently directed processes of radiation power variation are observed during the irradiation of LED in active modes. It is supposed that the first process is caused by the power reduction of LED emission due to the injection of the corresponding radiation defects. The second process is caused by a partial recovery of the emission power due to radiation, radiation-thermal, and/or electrostimulated annealing of a portion of the defects created. The observed recovery of the radiation power in the active supply mode of the LEDs during irradiation significantly increases their resistance to gamma-quantum irradiation.","PeriodicalId":20003,"journal":{"name":"Perspektivnye Materialy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82427637","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.30791/1028-978x-2022-6-37-45
P. Evdokimov, A. Kiseleva, A. Shibaev, O. Filippova, E. Novoseletskaya, A. Efimenko, I. M. Scherbakov, G. A. Shipunov, V. Dubrov, V. Putlayev
The possibility of obtaining highly porous composite hydrogel materials for biomedical applications based on tricalcium phosphate in a polyethylene glycol diacrylate matrix, aimed to repair bone defects, was studied. The influence of different contents of inorganic filler particles on the mechanical characteristics of highly porous hydrogel composites β-Ca3(PO4)2/polyethylene glycol diacrylate was studied. The possibility of creating highly porous composite materials with specified elastic properties is demonstrated. The dependence of the viscoelastic properties of the obtained materials on the size of the given porosity is shown. Varying the proportion of tricalcium phosphate in the highly porous hydrogel material makes it possible to control the relative stiffness of the composite.
{"title":"Highly porous composite hydrogel materials β-Ca3(PO4)2/polyethylene glycol diacrylate","authors":"P. Evdokimov, A. Kiseleva, A. Shibaev, O. Filippova, E. Novoseletskaya, A. Efimenko, I. M. Scherbakov, G. A. Shipunov, V. Dubrov, V. Putlayev","doi":"10.30791/1028-978x-2022-6-37-45","DOIUrl":"https://doi.org/10.30791/1028-978x-2022-6-37-45","url":null,"abstract":"The possibility of obtaining highly porous composite hydrogel materials for biomedical applications based on tricalcium phosphate in a polyethylene glycol diacrylate matrix, aimed to repair bone defects, was studied. The influence of different contents of inorganic filler particles on the mechanical characteristics of highly porous hydrogel composites β-Ca3(PO4)2/polyethylene glycol diacrylate was studied. The possibility of creating highly porous composite materials with specified elastic properties is demonstrated. The dependence of the viscoelastic properties of the obtained materials on the size of the given porosity is shown. Varying the proportion of tricalcium phosphate in the highly porous hydrogel material makes it possible to control the relative stiffness of the composite.","PeriodicalId":20003,"journal":{"name":"Perspektivnye Materialy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83579409","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：