Pub Date : 2023-01-01DOI: 10.30791/1028-978x-2023-1-55-65
V. V. Kurbatkina, E. Patsera, T. Sviridova, P. Loginov, D. Sidorenko, A. S. Kolva, E. Levashov
Porous sinters of solid solutions were obtained from the elements by the SHS method and then crushed in a ball mill to a fraction of d50 < 10 µm. Single-phase (Hf1 – хTах)B2 solid solutions with a wide range of compositions were obtained by a hot pressing. Detailed investigations of structure and properties were carried out. The plotted lattice parameters vs. solid solution stoichiometry diagrams confirmed the Vegard’s law. SEM, TEM, and EDX structural analysis demonstrated the existence of a HfВ2 – TaB2 single-phase solution region. The structure of samples (lamellas) of (Hf0.8Ta0.2)B2 and (Hf0.6Ta0.4)B2 solid solutions was analyzed by TEM. It has been established that with an increase in the content of tantalum, the size of subgrains decreases to 0.2 – 1 µm. This correlates with the CSR size determined by the X-ray diffraction method. Studies of mechanical properties of single-phase solid solutions have shown that (Hf0.8Ta0.2)B2 and (Hf0.6Ta0.4)B2 possessed extremely high hardness of 63–70 GPa and elastic modulus of 550 – 587 GPa. Electrical resistance dependence on temperature was investigated, values of heat capacity, thermal diffusivity and thermal conductivity coefficients were determined in a wide range of (Hf 1 – xTax)B2 solid solution compositions.
{"title":"Preparation, structure and properties of digoride’s solid solutions (Hf1 – хTaх)B2","authors":"V. V. Kurbatkina, E. Patsera, T. Sviridova, P. Loginov, D. Sidorenko, A. S. Kolva, E. Levashov","doi":"10.30791/1028-978x-2023-1-55-65","DOIUrl":"https://doi.org/10.30791/1028-978x-2023-1-55-65","url":null,"abstract":"Porous sinters of solid solutions were obtained from the elements by the SHS method and then crushed in a ball mill to a fraction of d50 < 10 µm. Single-phase (Hf1 – хTах)B2 solid solutions with a wide range of compositions were obtained by a hot pressing. Detailed investigations of structure and properties were carried out. The plotted lattice parameters vs. solid solution stoichiometry diagrams confirmed the Vegard’s law. SEM, TEM, and EDX structural analysis demonstrated the existence of a HfВ2 – TaB2 single-phase solution region. The structure of samples (lamellas) of (Hf0.8Ta0.2)B2 and (Hf0.6Ta0.4)B2 solid solutions was analyzed by TEM. It has been established that with an increase in the content of tantalum, the size of subgrains decreases to 0.2 – 1 µm. This correlates with the CSR size determined by the X-ray diffraction method. Studies of mechanical properties of single-phase solid solutions have shown that (Hf0.8Ta0.2)B2 and (Hf0.6Ta0.4)B2 possessed extremely high hardness of 63–70 GPa and elastic modulus of 550 – 587 GPa. Electrical resistance dependence on temperature was investigated, values of heat capacity, thermal diffusivity and thermal conductivity coefficients were determined in a wide range of (Hf 1 – xTax)B2 solid solution compositions.","PeriodicalId":20003,"journal":{"name":"Perspektivnye Materialy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87784225","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 : 2023-01-01DOI: 10.30791/1028-978x-2023-3-5-13
Y. S. Oglodkova, K. V. Antipov, M. Panteleev, A. Rudchenko
The features of the formation of the microstructure of welded joints of sheets of aluminum alloy V-1381 of the Al – Mg – Si – Cu system, obtained with various parameters of automatic argon-arc welding, were studied. Welding modes were selected that provide a high-quality welded joint and strength at a level not lower than 0.8 of the strength of the base metal. It has been established that welding without filler wire leads to cracking without applying tensile deformation, the use of Sv1221 filler wire compared to SvAMg61 and SvAK5 leads to an increase in the strength characteristics of welded joints by 15 – 20 %. Corrosion resistance of welded joints of sheets from V-1381 alloy was determined. Various experimental modes of laser welding were tested, the microstructure and mechanical properties of welded joints were studied. Parameters have been selected that ensure high quality of welds. The possibility of using laser welding for semi-finished products from alloy V-1381 has been established. The new V-1381 alloy can be recommended for use in aircraft fuselage structural elements, including as an alternative to less corrosion-resistant non-weldable alloys of the D16 type, which will increase the weight efficiency of structures both due to increased strength and through the use of welded joints instead of riveted ones.
研究了在不同氩弧焊参数下获得的Al - Mg - Si - Cu系V-1381铝合金薄板焊接接头显微组织的形成特征。所选择的焊接方式能够提供高质量的焊接接头，并且强度不低于母材强度的0.8。在不施加拉伸变形的情况下，不使用填充丝的焊接会导致开裂，与SvAMg61和SvAK5相比，使用Sv1221填充丝可使焊接接头的强度特性提高15 - 20%。测定了V-1381合金薄板焊接接头的耐腐蚀性能。对激光焊接的各种实验模式进行了测试，研究了焊接接头的显微组织和力学性能。参数的选择保证了焊缝的高质量。建立了激光焊接V-1381合金半成品的可能性。新的V-1381合金可以推荐用于飞机机身结构元件，包括作为D16型耐腐蚀性较差的不可焊接合金的替代品，这将增加结构的重量效率，因为增加了强度，并且通过使用焊接接头而不是铆接接头。
{"title":"Study of weldability of semi-products from an alloy of the Al – Mg – Si – Cu system","authors":"Y. S. Oglodkova, K. V. Antipov, M. Panteleev, A. Rudchenko","doi":"10.30791/1028-978x-2023-3-5-13","DOIUrl":"https://doi.org/10.30791/1028-978x-2023-3-5-13","url":null,"abstract":"The features of the formation of the microstructure of welded joints of sheets of aluminum alloy V-1381 of the Al – Mg – Si – Cu system, obtained with various parameters of automatic argon-arc welding, were studied. Welding modes were selected that provide a high-quality welded joint and strength at a level not lower than 0.8 of the strength of the base metal. It has been established that welding without filler wire leads to cracking without applying tensile deformation, the use of Sv1221 filler wire compared to SvAMg61 and SvAK5 leads to an increase in the strength characteristics of welded joints by 15 – 20 %. Corrosion resistance of welded joints of sheets from V-1381 alloy was determined. Various experimental modes of laser welding were tested, the microstructure and mechanical properties of welded joints were studied. Parameters have been selected that ensure high quality of welds. The possibility of using laser welding for semi-finished products from alloy V-1381 has been established. The new V-1381 alloy can be recommended for use in aircraft fuselage structural elements, including as an alternative to less corrosion-resistant non-weldable alloys of the D16 type, which will increase the weight efficiency of structures both due to increased strength and through the use of welded joints instead of riveted ones.","PeriodicalId":20003,"journal":{"name":"Perspektivnye Materialy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87941783","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 : 2023-01-01DOI: 10.30791/1028-978x-2023-3-32-42
A. Memetova, A. Zelenin, N. Memetov, A. Gerasimova, V. Yagubov, R. Stolyarov, N. Chapaksov
The carbon material was synthesized from polymer raw materials (MC-032). He MC-032 has been characterized by various methods, including N2 adsorption-desorption at 77 K, X-ray diffraction analysis, Fourier transform IR spectroscopy, and Raman spectroscopy. The resulting adsorbent has a well-developed porous structure (SBET = 2722 m2/g; VDFT = 1.08 cm3/g). The adsorption of methane was studied in a wide range of pressures at temperatures above the critical one. The maximum adsorption value is ~ 14 mmol/g at 298.15 K and 100 bar. Experimental data on methane adsorption on MC-032 were analyzed using the Dubinin–Radushkevich adsorption model in the temperature range 298.15 – 323.13 K and pressures up to 100 bar. It has been established that the average relative deviations between the experimental results and the results obtained using the Dubinin-Radushkevich model are less than 4 %. It is shown that the differential molar heats of methane adsorption decrease from ~ 25 to ~ 10 kJ/mol. The calculated characteristic adsorption energies are in the range of 5.88 – 6.21 kJ/mol, which indicates that the process of methane adsorption on MC-032 belongs to physical adsorption. MC-032 carbon material has strong adsorption capacity for methane and has good prospects for controlling methane emissions and reducing greenhouse gases.
{"title":"Sorption capacity of carbon material based on polymer raw materials with respect to methane","authors":"A. Memetova, A. Zelenin, N. Memetov, A. Gerasimova, V. Yagubov, R. Stolyarov, N. Chapaksov","doi":"10.30791/1028-978x-2023-3-32-42","DOIUrl":"https://doi.org/10.30791/1028-978x-2023-3-32-42","url":null,"abstract":"The carbon material was synthesized from polymer raw materials (MC-032). He MC-032 has been characterized by various methods, including N2 adsorption-desorption at 77 K, X-ray diffraction analysis, Fourier transform IR spectroscopy, and Raman spectroscopy. The resulting adsorbent has a well-developed porous structure (SBET = 2722 m2/g; VDFT = 1.08 cm3/g). The adsorption of methane was studied in a wide range of pressures at temperatures above the critical one. The maximum adsorption value is ~ 14 mmol/g at 298.15 K and 100 bar. Experimental data on methane adsorption on MC-032 were analyzed using the Dubinin–Radushkevich adsorption model in the temperature range 298.15 – 323.13 K and pressures up to 100 bar. It has been established that the average relative deviations between the experimental results and the results obtained using the Dubinin-Radushkevich model are less than 4 %. It is shown that the differential molar heats of methane adsorption decrease from ~ 25 to ~ 10 kJ/mol. The calculated characteristic adsorption energies are in the range of 5.88 – 6.21 kJ/mol, which indicates that the process of methane adsorption on MC-032 belongs to physical adsorption. MC-032 carbon material has strong adsorption capacity for methane and has good prospects for controlling methane emissions and reducing greenhouse gases.","PeriodicalId":20003,"journal":{"name":"Perspektivnye Materialy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86241839","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 : 2023-01-01DOI: 10.30791/1028-978x-2023-5-56-65
A. Larionov, D. Taranov, A. N. Rylov, M. Trubachev, S. A. Vohmentsev, M. Ziatdinov, I. R. Manashev, K. Pikulin
A technology for obtaining complex nitrogen- and carbon-containing precursor materials V(51 – 43) – Al(30 – 36) – N(13,4 – 16,4) – C(2,7 – 6,0) was developed and tested on an experimental scale by nitriding by the method of self-propagating high-temperature synthesis of mixtures of V(65 – 50) – Al master alloys powders with graphite. The ratio of nitrogen to carbon in precursors can be varied over a wide range — N/C = 5.5 – 2.2. Using X-ray phase analysis, it was found that nitrogen in these materials is in the form of AlN and VN nitrides, and carbon is in the form of V2C, VC and V2Al0.96C1.1 carbides. The possibility of replacing graphite in the charge of out-of-furnace aluminothermal smelting of the V – Al – N – C master alloy with an alternative precursor V(51) – Al(30) – N(15) – C(2.7) has been experimentally confirmed. Using the methods of X-ray phase analysis, electron microscopy, and X-ray spectral microanalysis, it was found that the smelted using this precursor V – Al – N – C master alloy ingot is identical in phase composition and in distribution uniformity of nitride and carbide inclusions to alloy ingots that were smelted using other carbon-containing materials. The content of nitrogen, carbon and oxygen in the ingot meet the requirements of the technical specifications for V – Al – N – C master alloy.
研究了V(65 - 50) - Al中间合金粉末与石墨混合自蔓延高温合成氮化法制备V(51 - 43) - Al(30 - 36) - N(13,4 - 16,4) - C(2,7 - 6,0)复合含氮和含碳前驱体材料的工艺，并进行了实验测试。前体中氮碳比的变化范围很广——N/C = 5.5 - 2.2。通过x射线相分析发现，这些材料中的氮以AlN和VN氮化物的形式存在，碳以V2C、VC和V2Al0.96C1.1碳化物的形式存在。实验证实了用V(51) - Al(30) - N(15) - C(2.7)替代前驱体替代V - Al - N - C中间合金炉外热熔炼炉料中石墨的可能性。采用x射线物相分析、电子显微镜和x射线能谱显微分析等方法，发现用该前驱体V - Al - N - C冶炼的主合金锭与用其他含碳材料冶炼的合金锭在相组成、氮化物和碳化物夹杂物分布均匀性上完全相同。铸锭中氮、碳、氧的含量符合V - Al - N - C中间合金技术规范的要求。
{"title":"Development of production technology and approbation of a new nitrogen- and carbon-containing precursor based on vanadium and aluminum for smelting a V – Al – N – C master alloy","authors":"A. Larionov, D. Taranov, A. N. Rylov, M. Trubachev, S. A. Vohmentsev, M. Ziatdinov, I. R. Manashev, K. Pikulin","doi":"10.30791/1028-978x-2023-5-56-65","DOIUrl":"https://doi.org/10.30791/1028-978x-2023-5-56-65","url":null,"abstract":"A technology for obtaining complex nitrogen- and carbon-containing precursor materials V(51 – 43) – Al(30 – 36) – N(13,4 – 16,4) – C(2,7 – 6,0) was developed and tested on an experimental scale by nitriding by the method of self-propagating high-temperature synthesis of mixtures of V(65 – 50) – Al master alloys powders with graphite. The ratio of nitrogen to carbon in precursors can be varied over a wide range — N/C = 5.5 – 2.2. Using X-ray phase analysis, it was found that nitrogen in these materials is in the form of AlN and VN nitrides, and carbon is in the form of V2C, VC and V2Al0.96C1.1 carbides. The possibility of replacing graphite in the charge of out-of-furnace aluminothermal smelting of the V – Al – N – C master alloy with an alternative precursor V(51) – Al(30) – N(15) – C(2.7) has been experimentally confirmed. Using the methods of X-ray phase analysis, electron microscopy, and X-ray spectral microanalysis, it was found that the smelted using this precursor V – Al – N – C master alloy ingot is identical in phase composition and in distribution uniformity of nitride and carbide inclusions to alloy ingots that were smelted using other carbon-containing materials. The content of nitrogen, carbon and oxygen in the ingot meet the requirements of the technical specifications for V – Al – N – C master alloy.","PeriodicalId":20003,"journal":{"name":"Perspektivnye Materialy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87712102","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 : 2023-01-01DOI: 10.30791/1028-978x-2023-1-37-45
L. I. Podzorova, A. Il’icheva, O. I. Pen’kova, V. Sirotinkin, O. Antonova, A. Baikin, G. Kochanov
The paper considers the effect of hydrothermal treatment, simulating a long stay in a biological environment, on the phase composition and bending strength of Al2O3 – [ZrYb]O2 composites containing a variable amount of Al2O3 and including strontium hexaaluminate. It has been shown that composites retain bending strength after hydrothermal action. This fact indicates the preservation of the phase composition in the volume of materials. It is determined that a monoclinic phase of zirconia is formed in the near-surface layer of the samples, the amount of which ranges from 11 to 9 %, correlating with the increase in the content of alumina in the composite. The formation of the monoclinic phase of zirconia in such an amount is well below the limit of 25 % specified in ISO 13356 2015 Implants for surgery — Ceramic materials based on yttria-stabilized tetragonal zirconia (Y-TZP). The results obtained make it possible to recommend Al2O3 – [ZrYb]O2 composites containing strontium hexaaluminate for medical applications.
{"title":"Low-temperature aging of composites on the basis system Al2O3 – [ZrYb]O2 including strontium hexaaluminate","authors":"L. I. Podzorova, A. Il’icheva, O. I. Pen’kova, V. Sirotinkin, O. Antonova, A. Baikin, G. Kochanov","doi":"10.30791/1028-978x-2023-1-37-45","DOIUrl":"https://doi.org/10.30791/1028-978x-2023-1-37-45","url":null,"abstract":"The paper considers the effect of hydrothermal treatment, simulating a long stay in a biological environment, on the phase composition and bending strength of Al2O3 – [ZrYb]O2 composites containing a variable amount of Al2O3 and including strontium hexaaluminate. It has been shown that composites retain bending strength after hydrothermal action. This fact indicates the preservation of the phase composition in the volume of materials. It is determined that a monoclinic phase of zirconia is formed in the near-surface layer of the samples, the amount of which ranges from 11 to 9 %, correlating with the increase in the content of alumina in the composite. The formation of the monoclinic phase of zirconia in such an amount is well below the limit of 25 % specified in ISO 13356 2015 Implants for surgery — Ceramic materials based on yttria-stabilized tetragonal zirconia (Y-TZP). The results obtained make it possible to recommend Al2O3 – [ZrYb]O2 composites containing strontium hexaaluminate for medical applications.","PeriodicalId":20003,"journal":{"name":"Perspektivnye Materialy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82270094","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 : 2023-01-01DOI: 10.30791/1028-978x-2023-6-67-79
S. Yaresko, A. T. Kozakov, A. V. Sidashov, V. Scherbakov
The microstructure and tribological characteristics of the modified surface of AISI E3310 and AISI A290C1M structural alloy steels after laser treatment using an ytterbium continuous fiber laser have been studied. Laser surface treatment was carried out on air with laser power outputs of 75 W and 100 W and scanning speeds from 2 to 14 mm/s. Metallographic analysis and durometer testing were applied to determine the structure of laser action zones and the steel structural components there. It has been shown that the scanning speed at a laser power of 100 W has the most significant effect on the dimensions of the laser action zones. The maximum depth of the laser action zone during laser treatment without surface melting is 310 and 170 µm for E3310 and A290C1M steel, respectively. Depending on the mode of hardening, the microhardness in the laser action zones varies from 1.36 to 1.97 times for E3310 steel; as for A290C1M steel, it increases by 2.0 – 2.6 times. At 100 µm hardening depth, the reduction in linear wear and wear intensity reaches 26.6 % and 43.9 % for E3310 and A290C1M steel, respectively.
{"title":"Tribological characteristics of structural alloy steels after laser modification of their surface","authors":"S. Yaresko, A. T. Kozakov, A. V. Sidashov, V. Scherbakov","doi":"10.30791/1028-978x-2023-6-67-79","DOIUrl":"https://doi.org/10.30791/1028-978x-2023-6-67-79","url":null,"abstract":"The microstructure and tribological characteristics of the modified surface of AISI E3310 and AISI A290C1M structural alloy steels after laser treatment using an ytterbium continuous fiber laser have been studied. Laser surface treatment was carried out on air with laser power outputs of 75 W and 100 W and scanning speeds from 2 to 14 mm/s. Metallographic analysis and durometer testing were applied to determine the structure of laser action zones and the steel structural components there. It has been shown that the scanning speed at a laser power of 100 W has the most significant effect on the dimensions of the laser action zones. The maximum depth of the laser action zone during laser treatment without surface melting is 310 and 170 µm for E3310 and A290C1M steel, respectively. Depending on the mode of hardening, the microhardness in the laser action zones varies from 1.36 to 1.97 times for E3310 steel; as for A290C1M steel, it increases by 2.0 – 2.6 times. At 100 µm hardening depth, the reduction in linear wear and wear intensity reaches 26.6 % and 43.9 % for E3310 and A290C1M steel, respectively.","PeriodicalId":20003,"journal":{"name":"Perspektivnye Materialy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82599689","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 : 2023-01-01DOI: 10.30791/1028-978x-2023-7-10-22
O. Volovlikova, S. Gavrilov
The evolution of macro- and mesoporous layers of porous silicon formed by Pd-assisted etching with different duration of formation and temperature of the etching solution from 25 to 75 °С, which have the property of ethanol electrooxidation, has been studied. High values of the dissolution rate of porous silicon at a temperature of 75 °С are shown, leading to a significant loss of thickness and specific surface area of the macro- and mesoporous layer, respectively. The obtained porous layers with different surface energy and surface area, show different rates of ethanol dehydrogenation and the number of dehydrogenated ethanol molecules, which allows you to control the activity of the electrode material for ethanol fuel cells.
{"title":"The electrode morphology and surface energy controlling for formation of the ethanol fuel cells based on porous silicon formed by Pd-assisted etching","authors":"O. Volovlikova, S. Gavrilov","doi":"10.30791/1028-978x-2023-7-10-22","DOIUrl":"https://doi.org/10.30791/1028-978x-2023-7-10-22","url":null,"abstract":"The evolution of macro- and mesoporous layers of porous silicon formed by Pd-assisted etching with different duration of formation and temperature of the etching solution from 25 to 75 °С, which have the property of ethanol electrooxidation, has been studied. High values of the dissolution rate of porous silicon at a temperature of 75 °С are shown, leading to a significant loss of thickness and specific surface area of the macro- and mesoporous layer, respectively. The obtained porous layers with different surface energy and surface area, show different rates of ethanol dehydrogenation and the number of dehydrogenated ethanol molecules, which allows you to control the activity of the electrode material for ethanol fuel cells.","PeriodicalId":20003,"journal":{"name":"Perspektivnye Materialy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76722080","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 : 2023-01-01DOI: 10.30791/1028-978x-2023-1-28-36
T. S. Kuznetsova, T. Pasko, A. Burakov, I. Burakova, E. Mkrtchyan, O. A. Ananyeva, A. Tkachev
Liquid-phase sorption is a multi-stage process, the success of which depends on many factors. One of the key parameters that determines the extraction efficiency is the liquid medium pH value. In this study, the effect of the pH value of model aqueous solutions containing separately heavy metal ions (using zinc and lead ions as an example), as well as organic dyes methylene blue (MB) and sunset yellow (SY), was evaluated. The required pH value was achieved by preparing the solutions in appropriate buffer systems. As a sorbent, a nanostructured composite material was used, represented by a matrix of carbon nanotubes and graphene oxide modified with polyaniline, where phenol-formaldehyde resin acted as a binding agent. Various forms of this material were considered — xerogel, cryogel, aerogel, as well as their carbonized modifications. As a result of experimental studies, it was found that for all used heavy metal ions (zinc and lead) and MB for all sorbents forms, the maximum adsorption capacity was noted at pH = 6. At the anionic dye SY adsorption, the best result was achieved at pH = 2.
{"title":"Investigation of pH effect on adsorption properties of the nanostructured graphene-containing composite materials, modified by polyaniline, in the adsorption of various chemical nature pollutants","authors":"T. S. Kuznetsova, T. Pasko, A. Burakov, I. Burakova, E. Mkrtchyan, O. A. Ananyeva, A. Tkachev","doi":"10.30791/1028-978x-2023-1-28-36","DOIUrl":"https://doi.org/10.30791/1028-978x-2023-1-28-36","url":null,"abstract":"Liquid-phase sorption is a multi-stage process, the success of which depends on many factors. One of the key parameters that determines the extraction efficiency is the liquid medium pH value. In this study, the effect of the pH value of model aqueous solutions containing separately heavy metal ions (using zinc and lead ions as an example), as well as organic dyes methylene blue (MB) and sunset yellow (SY), was evaluated. The required pH value was achieved by preparing the solutions in appropriate buffer systems. As a sorbent, a nanostructured composite material was used, represented by a matrix of carbon nanotubes and graphene oxide modified with polyaniline, where phenol-formaldehyde resin acted as a binding agent. Various forms of this material were considered — xerogel, cryogel, aerogel, as well as their carbonized modifications. As a result of experimental studies, it was found that for all used heavy metal ions (zinc and lead) and MB for all sorbents forms, the maximum adsorption capacity was noted at pH = 6. At the anionic dye SY adsorption, the best result was achieved at pH = 2.","PeriodicalId":20003,"journal":{"name":"Perspektivnye Materialy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74318313","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 : 2023-01-01DOI: 10.30791/1028-978x-2023-2-5-20
V. S. Kostina, M. Kostina
Alloying with nitrogen allows one to substantially increase the strength of steels, especially of the austenitic steels, in which the equilibrium nitrogen content can reach 0.4 – 0.7 wt % depending on their chemical composition. Nitrogen stabilizes austenite and enhances its corrosion and wear resistance. For this reason, nitrogen-containing austenitic steels are advantageous structural materials, in particular, for heavy loaded welded structures. However, wrong choice of the welding method, regime, or filler for high-nitrogen steels can cause critical defects such as pores and cracks in the welded joints and substantially decrease their mechanical properties and corrosion resistance compared to those of the base metal. More than hundred literature sources have been considered for the analysis of welding types and methods for austenitic steels containing ≥ 0.4 wt. % nitrogen, the criteria for their weldability, and the causes for potential negative phenomena occurring upon their welding. For such steels, information is provided on the welding filler materials as well as on the modes and parameters of the welding process (supplied heat, presence/absence of a protective atmosphere, its composition, etc.). The structure, phase composition, and properties of the resulting welded joints are considered. The examples are given on the effect of the subsequent processing of welded joints (heat treatment and thermal deformation processing for the elimination of the resulting distortion) on their basic properties.
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Pub Date : 2023-01-01DOI: 10.30791/1028-978x-2023-7-34-45
M. Gryaznov, S. Shotin, V. Chuvildeev, A. N. Sysoev, D. N. Kotkov, A. Piskunov, N. Sakharov, A. V. Semenycheva, A. Murashov
Samples of unalloyed titanium VT1-0 with high strength characteristics (ultimate tensile strength of 820 MPa), which exceed the values for this material manufactured using conventional technologies, were produced by selective laser melting. To solve the problem of substitution of titanium alloys with commercially pure titanium in medical applications, unalloyed titanium VT1-0 with record mechanical characteristics (ultimate tensile strength of 1350 MPa) was processed by selective laser melting and rotary swaging. This value exceeds the characteristics of the highstrength Ti – 6 % Al – 4 % V alloy. The fine-dispersed martensite formed as a result of high crystallization rates under optimal mode of selective laser melting is the reason for the strength characteristics increase of unalloyed titanium VT1-0.
采用选择性激光熔化法制备了具有高强度特性(极限抗拉强度820 MPa)的非合金化钛VT1-0样品，该样品的抗拉强度超过了传统工艺的极限抗拉强度。为解决工业纯钛在医疗应用中替代钛合金的问题，采用选择性激光熔化和旋转锻压的方法对具有创记录力学性能(极限抗拉强度1350 MPa)的非合金化钛VT1-0进行了加工。这一数值超过了高强度Ti - 6% Al - 4% V合金的特性。在选择激光熔化的最佳模式下，高结晶速率所形成的细小分散的马氏体是导致非合金化钛VT1-0强度特性提高的原因。
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