Pub Date : 2023-01-01DOI: 10.30791/1028-978x-2023-4-68-75
E. Simakina, E. Y. Liberman, B. S. Kleusov, T. Kon’kova, V. N. Grunskii, A. N. Morozov, A. V. Denisenko
Fluorite-like solid solutions of Ce0.9Sn0.1O2 and Ce0.8Sn0.1Zr0.1O2 are synthesized by co-precipitation using ammonium carbonate as a precipitant. The samples were characterized by X-ray phase analysis, electron microscopy, energy dispersive analysis, low-temperature nitrogen adsorption, and gas chromatography. It is shown that the formation of solid solutions occurs even at an annealing temperature of 550°C. In this case, the formation of lamellar particles occurs, the size of which, according to SEM data, is 4 μm. The synthesized materials have a mesoporous structure. The specific surface area of Ce0.9Sn0.1O2 samples is 80.6 m2/g, Ce0.8Zr0.1Sn0.1O2 is 76.3 m2/g. Carrying out the calcination at a temperature of 800 °C leads to an increase in the particle size up to 8 – 10 µm. The highest specific surface area of 15.3 m2/g is typical for the Ce0.8Zr0.1Sn0.1O2 sample, which is due to the presence of zirconium ions in its composition. The synthesized compositions demonstrated high activity in CO oxidation. The maximum catalytic activity was observed for the bicomponent system Ce0.9Sn0.1O2: T50% — 180°C, T90% — 236 °C. For samples calcined at a temperature of 800 °C, the most active is Ce0.8Zr0.1Sn0.1O2, which is due to the formation of a more thermally stable system compared to cerium dioxide and Ce0.9Sn0.1O2. To increase the thermal stability, it is advisable to dope the bicomponent composition Ce0.9Sn0.1O2 with Zr+4 ions.
{"title":"Synthesis and catalytic activity of highly dispersed solid solutions Ce0,9Sn0,1O2 and Ce0,8Sn0,1Zr0,1O2 in CO oxidation","authors":"E. Simakina, E. Y. Liberman, B. S. Kleusov, T. Kon’kova, V. N. Grunskii, A. N. Morozov, A. V. Denisenko","doi":"10.30791/1028-978x-2023-4-68-75","DOIUrl":"https://doi.org/10.30791/1028-978x-2023-4-68-75","url":null,"abstract":"Fluorite-like solid solutions of Ce0.9Sn0.1O2 and Ce0.8Sn0.1Zr0.1O2 are synthesized by co-precipitation using ammonium carbonate as a precipitant. The samples were characterized by X-ray phase analysis, electron microscopy, energy dispersive analysis, low-temperature nitrogen adsorption, and gas chromatography. It is shown that the formation of solid solutions occurs even at an annealing temperature of 550°C. In this case, the formation of lamellar particles occurs, the size of which, according to SEM data, is 4 μm. The synthesized materials have a mesoporous structure. The specific surface area of Ce0.9Sn0.1O2 samples is 80.6 m2/g, Ce0.8Zr0.1Sn0.1O2 is 76.3 m2/g. Carrying out the calcination at a temperature of 800 °C leads to an increase in the particle size up to 8 – 10 µm. The highest specific surface area of 15.3 m2/g is typical for the Ce0.8Zr0.1Sn0.1O2 sample, which is due to the presence of zirconium ions in its composition. The synthesized compositions demonstrated high activity in CO oxidation. The maximum catalytic activity was observed for the bicomponent system Ce0.9Sn0.1O2: T50% — 180°C, T90% — 236 °C. For samples calcined at a temperature of 800 °C, the most active is Ce0.8Zr0.1Sn0.1O2, which is due to the formation of a more thermally stable system compared to cerium dioxide and Ce0.9Sn0.1O2. To increase the thermal stability, it is advisable to dope the bicomponent composition Ce0.9Sn0.1O2 with Zr+4 ions.","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":"76963695","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-2023-5-82-88
O. Elagina, A. A. Ushkarev, L. A. Savenkov
The article considers the influence of such parameters as infill density, infill line directions and line width on the mechanical properties of samples made of polyethylene terephthalate glycol by FDM-printing. Mathematical expressions were obtained on the basis of the conducted research. These mathematical expressions allow to calculate the expected mechanical properties of the studied PET-G brand under uniaxial tensile, static and impact bending. The influence of variable FDM-printing parameters on the formed level of product properties is investigated, which will allow the selection of their values depending on the required tasks.
{"title":"Influence of 3D-printing parameters on mechanical properties of polyethylene terephthalate glycol (PET-G) products","authors":"O. Elagina, A. A. Ushkarev, L. A. Savenkov","doi":"10.30791/1028-978x-2023-5-82-88","DOIUrl":"https://doi.org/10.30791/1028-978x-2023-5-82-88","url":null,"abstract":"The article considers the influence of such parameters as infill density, infill line directions and line width on the mechanical properties of samples made of polyethylene terephthalate glycol by FDM-printing. Mathematical expressions were obtained on the basis of the conducted research. These mathematical expressions allow to calculate the expected mechanical properties of the studied PET-G brand under uniaxial tensile, static and impact bending. The influence of variable FDM-printing parameters on the formed level of product properties is investigated, which will allow the selection of their values depending on the required tasks.","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":"73412524","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-2023-6-52-59
M. Zarifova, I. N. Ganiyev, Kh.I. Kholov, S. K. Sharipov, F. K. Khodzhayev
The results of a corrosion-electrochemical study of the effect of lanthanum additives as an alloying component on the anodic behavior of lead babbit of the BLa brand (PbSb15Sn10), in a NaCl electrolyte medium with a concentration of 0.03; 0.3 and 3.0 % (by weight) are presented. The anodic behavior of babbits was investigated by the potentiostatic method at a potential sweep rate of 2 mV/s. The lanthanum content in lead babbit BLa (PbSb15Sn10) was 0.01, 0.1, 0.50 and 1.0 % (by weight). It was found that with an increase in the concentration of chloride ion in the NaCl electrolyte, there is a shift in the negative region of the values of the potentials of corrosion, pitting formation and repassivation of babbits. The free corrosion potential of lead babbit shifts from time to time to the positive region. Regardless of the composition of babbits, an increase in the rate of their corrosion was established with an increase in the concentration of NaCl in the electrolyte. The addition of lanthanum to lead babbit increases its corrosion resistance. It is shown that lead babbit corrodes by the pitting mechanism and lanthanum as an alloying component of lead babbit BLa (PbSb15Sn10) contributes to the shift of the potentials of pitting formation and repassivation to the region of positive values. This leads to an increase in the resistance of lead babbit to pitting corrosion, and also contributes to the healing of incipient pitting foci.
{"title":"Potentiodynamic study of lead babbit BLa (PbSb15Sn10), with lanthanum, in the electrolyte environment NaCl","authors":"M. Zarifova, I. N. Ganiyev, Kh.I. Kholov, S. K. Sharipov, F. K. Khodzhayev","doi":"10.30791/1028-978x-2023-6-52-59","DOIUrl":"https://doi.org/10.30791/1028-978x-2023-6-52-59","url":null,"abstract":"The results of a corrosion-electrochemical study of the effect of lanthanum additives as an alloying component on the anodic behavior of lead babbit of the BLa brand (PbSb15Sn10), in a NaCl electrolyte medium with a concentration of 0.03; 0.3 and 3.0 % (by weight) are presented. The anodic behavior of babbits was investigated by the potentiostatic method at a potential sweep rate of 2 mV/s. The lanthanum content in lead babbit BLa (PbSb15Sn10) was 0.01, 0.1, 0.50 and 1.0 % (by weight). It was found that with an increase in the concentration of chloride ion in the NaCl electrolyte, there is a shift in the negative region of the values of the potentials of corrosion, pitting formation and repassivation of babbits. The free corrosion potential of lead babbit shifts from time to time to the positive region. Regardless of the composition of babbits, an increase in the rate of their corrosion was established with an increase in the concentration of NaCl in the electrolyte. The addition of lanthanum to lead babbit increases its corrosion resistance. It is shown that lead babbit corrodes by the pitting mechanism and lanthanum as an alloying component of lead babbit BLa (PbSb15Sn10) contributes to the shift of the potentials of pitting formation and repassivation to the region of positive values. This leads to an increase in the resistance of lead babbit to pitting corrosion, and also contributes to the healing of incipient pitting foci.","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":"73629858","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-2023-6-60-66
A. A. Maslov, A. Nazarov, A. Nikolaev, E. Vardanyan, K. Ramazanov
The paper presents results of the phase composition investigations of coatings based on the Ti – Al – C system using an X-ray diffractometer and a synchrotron radiation source. A coating based on the Ti – Al – C system was deposited on molybdenum and titanium samples by cathodic-arc deposition from two single-component titanium and aluminum cathodes in a mixture of acetylene and argon. The results of the study of the phase composition showed that the formation of the Ti2AlC and Ti2C phases depends on the heat treatment mode. Using synchrotron radiation, the phase stability of the coating was studied when the sample was heated to 1500 °C in vacuum. It has been established that the coating after deposition has an amorphous structure, which crystallizes after annealing in vacuum with the formation of Ti2AlC, Ti2C phases and Ti – Al intermetallic compounds.
本文介绍了用x射线衍射仪和同步辐射源对Ti - Al - C体系涂层进行相组成研究的结果。在乙炔和氩气的混合介质中，采用双单组分钛和铝阴极阴极电弧沉积的方法，在钼和钛样品上沉积了一层基于Ti - Al - C体系的涂层。相组成研究结果表明，Ti2AlC和Ti2C相的形成与热处理方式有关。采用同步辐射技术，研究了样品在真空中加热至1500℃时涂层的相稳定性。结果表明，沉积后的涂层具有非晶态结构，真空退火后结晶形成Ti2AlC、Ti2C相和Ti - Al金属间化合物。
{"title":"Investigation of coatings based on the Ti – Al – C system using synchrotron radiation and X-ray diffraction","authors":"A. A. Maslov, A. Nazarov, A. Nikolaev, E. Vardanyan, K. Ramazanov","doi":"10.30791/1028-978x-2023-6-60-66","DOIUrl":"https://doi.org/10.30791/1028-978x-2023-6-60-66","url":null,"abstract":"The paper presents results of the phase composition investigations of coatings based on the Ti – Al – C system using an X-ray diffractometer and a synchrotron radiation source. A coating based on the Ti – Al – C system was deposited on molybdenum and titanium samples by cathodic-arc deposition from two single-component titanium and aluminum cathodes in a mixture of acetylene and argon. The results of the study of the phase composition showed that the formation of the Ti2AlC and Ti2C phases depends on the heat treatment mode. Using synchrotron radiation, the phase stability of the coating was studied when the sample was heated to 1500 °C in vacuum. It has been established that the coating after deposition has an amorphous structure, which crystallizes after annealing in vacuum with the formation of Ti2AlC, Ti2C phases and Ti – Al intermetallic compounds.","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":"77084621","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-2023-1-19-27
R. Khasanshin, L. Novikov
The results of experimental studies of the processes occurring on the surface of protective glasses of solar batteries and elements of reflective coatings of high-orbit artificial Earth satellites (AES) under irradiation with electrons with an energy of 30 keV are presented. The studied samples were made on the basis of K-208 glass, while the samples of reflective coatings differed in the presence of silver and stainless steel layers on the reverse surface of the glass plates, deposited sequentially by the magnetron sputtering method. Electron irradiation of the samples was carried out in a vacuum of 10–4 Pa at a particle flux density (φ) from 1·109 to 8·1012 cm–2s–1; the surfaces of the samples before and after irradiation were examined by atomic force microscopy (AFM). On the irradiated surface of glass samples, electrostatic discharges (ESD) arose, the parameters of which were characterized by oscillograms of generated electromagnetic pulses; for elements of reflective coatings, leakage currents to the metal substrate were additionally measured. It was found that changes in the structure of the irradiated surface of the samples are due to the appearance of traces of ESD and the formation of gas-filled bubbles on it, and changes in the back surface of glass plates are caused, presumably, by shock waves formed when ESD occurs on the irradiated surface. The ESD frequency and leakage currents increase with increasing electron flux density in the specified range, but these dependences differ significantly. Measurements at a constant value of φ = 2.0·1010 cm–2s–1 showed that with an increase in the electron fluence from 1014 to 5·1016 cm–2, the ESR frequency increases, but the amplitude of electromagnetic pulses decreases.
{"title":"Processes on the glass surface under irradiation with medium-energy electrons","authors":"R. Khasanshin, L. Novikov","doi":"10.30791/1028-978x-2023-1-19-27","DOIUrl":"https://doi.org/10.30791/1028-978x-2023-1-19-27","url":null,"abstract":"The results of experimental studies of the processes occurring on the surface of protective glasses of solar batteries and elements of reflective coatings of high-orbit artificial Earth satellites (AES) under irradiation with electrons with an energy of 30 keV are presented. The studied samples were made on the basis of K-208 glass, while the samples of reflective coatings differed in the presence of silver and stainless steel layers on the reverse surface of the glass plates, deposited sequentially by the magnetron sputtering method. Electron irradiation of the samples was carried out in a vacuum of 10–4 Pa at a particle flux density (φ) from 1·109 to 8·1012 cm–2s–1; the surfaces of the samples before and after irradiation were examined by atomic force microscopy (AFM). On the irradiated surface of glass samples, electrostatic discharges (ESD) arose, the parameters of which were characterized by oscillograms of generated electromagnetic pulses; for elements of reflective coatings, leakage currents to the metal substrate were additionally measured. It was found that changes in the structure of the irradiated surface of the samples are due to the appearance of traces of ESD and the formation of gas-filled bubbles on it, and changes in the back surface of glass plates are caused, presumably, by shock waves formed when ESD occurs on the irradiated surface. The ESD frequency and leakage currents increase with increasing electron flux density in the specified range, but these dependences differ significantly. Measurements at a constant value of φ = 2.0·1010 cm–2s–1 showed that with an increase in the electron fluence from 1014 to 5·1016 cm–2, the ESR frequency increases, but the amplitude of electromagnetic pulses decreases.","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":"83924994","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-2023-5-72-81
A. Badamshin, S. N. Nesov, S. N. Povoroznyuk, V. V. Akimov, D. A. Polonyankin, A. Krutko, E. Rogachev, E. V. Knyazev, O. Burgonova
In the work presents the results of a study of the influence of the effect of a continuous ion beam of the composition (Ar++Zr+) with an ion energy E ≈ 20 keV and an irradiation dose D ≈ 5·1017 ion/cm2 on the phase composition, chemical state, microhardness, wear resistance during friction against an abrasive and corrosion resistance of tungsten-free hard alloys of the TiC – TiNi system. Analysis of the structure, morphology, and chemical state of the samples before and after ion treatment was carried out using scanning electron and scanning probe microscopy, as well as X-ray photoelectron spectroscopy and X-ray diffraction analysis. The features of the change in the physicochemical state of the tungsten-free hard alloy of the “TiC – TiNi” system subjected to continuous ion beam irradiation are revealed. It has been experimentally established that ion-beam treatment provides an increase in microhardness, wear resistance and corrosion resistance of the hard alloy.
{"title":"Physical-chemical properties and functional characteristics of a tungsten-free hard alloy of the “TiC – TiNi” system subjected to ion-beam processing","authors":"A. Badamshin, S. N. Nesov, S. N. Povoroznyuk, V. V. Akimov, D. A. Polonyankin, A. Krutko, E. Rogachev, E. V. Knyazev, O. Burgonova","doi":"10.30791/1028-978x-2023-5-72-81","DOIUrl":"https://doi.org/10.30791/1028-978x-2023-5-72-81","url":null,"abstract":"In the work presents the results of a study of the influence of the effect of a continuous ion beam of the composition (Ar++Zr+) with an ion energy E ≈ 20 keV and an irradiation dose D ≈ 5·1017 ion/cm2 on the phase composition, chemical state, microhardness, wear resistance during friction against an abrasive and corrosion resistance of tungsten-free hard alloys of the TiC – TiNi system. Analysis of the structure, morphology, and chemical state of the samples before and after ion treatment was carried out using scanning electron and scanning probe microscopy, as well as X-ray photoelectron spectroscopy and X-ray diffraction analysis. The features of the change in the physicochemical state of the tungsten-free hard alloy of the “TiC – TiNi” system subjected to continuous ion beam irradiation are revealed. It has been experimentally established that ion-beam treatment provides an increase in microhardness, wear resistance and corrosion resistance of the hard 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":"84696800","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-2022-7-66-74
A. Ivanova, L. N. Krasilnikova, O. Lezova, O. A. Zagrebelny, R. Khodzhaev, T. V. Khamova, V. Trusov, O. Shilova
The article considers the effect of atmospheric corrosion inhibitors “NOTEH”, “N-M-1”, “FMT” and phosphating primer VL-02 on the electrochemical properties of anticorrosive coatings based on a new modification of the organosilicate composition — brand OS-51-03M. For corrosion tests using the method of potentiodynamic polarization, carbon steel plates of the St3sp5 brand were used, on which coatings were applied by the paint and varnish method. It was revealed that the aqueous phosphating composition “NOTEH” and the corrosion inhibitor “N-M-1” significantly increase the corrosion resistance of organosilicate coatings in an aggressive environment — 3 % NaCl solution. For these coatings, it is impossible to register the current and corrosion potential after 1 month of exposure of coatings in a corrosive environment. Under similar measurement conditions, the electrochemical parameters of steel plates with unmodified organosilicate coating were recorded — the corrosion current density and corrosion potential were equal to 8·10-9A/m2 and –144 mV, respectively. It was revealed that the phosphating primer VL-02 has a negligible effect on increasing the duration of anticorrosive protection of the organosilicate coating system. The type of inhibitory protection of atmospheric corrosion inhibitors has been determined.
{"title":"Electrochemical properties of anticorrosive coatings based on organosilicate composition in combination with corrosion inhibitors","authors":"A. Ivanova, L. N. Krasilnikova, O. Lezova, O. A. Zagrebelny, R. Khodzhaev, T. V. Khamova, V. Trusov, O. Shilova","doi":"10.30791/1028-978x-2022-7-66-74","DOIUrl":"https://doi.org/10.30791/1028-978x-2022-7-66-74","url":null,"abstract":"The article considers the effect of atmospheric corrosion inhibitors “NOTEH”, “N-M-1”, “FMT” and phosphating primer VL-02 on the electrochemical properties of anticorrosive coatings based on a new modification of the organosilicate composition — brand OS-51-03M. For corrosion tests using the method of potentiodynamic polarization, carbon steel plates of the St3sp5 brand were used, on which coatings were applied by the paint and varnish method. It was revealed that the aqueous phosphating composition “NOTEH” and the corrosion inhibitor “N-M-1” significantly increase the corrosion resistance of organosilicate coatings in an aggressive environment — 3 % NaCl solution. For these coatings, it is impossible to register the current and corrosion potential after 1 month of exposure of coatings in a corrosive environment. Under similar measurement conditions, the electrochemical parameters of steel plates with unmodified organosilicate coating were recorded — the corrosion current density and corrosion potential were equal to 8·10-9A/m2 and –144 mV, respectively. It was revealed that the phosphating primer VL-02 has a negligible effect on increasing the duration of anticorrosive protection of the organosilicate coating system. The type of inhibitory protection of atmospheric corrosion inhibitors has been determined.","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":"82148801","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-2022-12-76-81
M. Alymov, S. I. Averin, A. Ankudinov
A method for calculating the internal pressure in a cylindrical pore that has arisen in the material of a product made using powder metallurgy technologies is described. A pore with an internal pressure, from certain positions, should be considered as a defect, which, if not removed, then at least from the known pressure inside the pore, certain onclusions can be drawn about the degree of strength reliability of this porous product. In addition, the measured pressure inside the pores allows you to optimize the manufacturing processes of products, control the structure and properties, and avoid the formation of cracks at the boundaries of the particles that make up the material. In this paper, a method is proposed for calculating the pressure in a pore, based on the displacements of the outer surface of the sample, when an external load is applied to the product. In this case, the known solutions of the problem of elasticity theory about the deformation of a spherical cavity located in the center of a spherical hollow ball are used.
{"title":"Calculation of internal pressure in a cylindrical pore","authors":"M. Alymov, S. I. Averin, A. Ankudinov","doi":"10.30791/1028-978x-2022-12-76-81","DOIUrl":"https://doi.org/10.30791/1028-978x-2022-12-76-81","url":null,"abstract":"A method for calculating the internal pressure in a cylindrical pore that has arisen in the material of a product made using powder metallurgy technologies is described. A pore with an internal pressure, from certain positions, should be considered as a defect, which, if not removed, then at least from the known pressure inside the pore, certain onclusions can be drawn about the degree of strength reliability of this porous product. In addition, the measured pressure inside the pores allows you to optimize the manufacturing processes of products, control the structure and properties, and avoid the formation of cracks at the boundaries of the particles that make up the material. In this paper, a method is proposed for calculating the pressure in a pore, based on the displacements of the outer surface of the sample, when an external load is applied to the product. In this case, the known solutions of the problem of elasticity theory about the deformation of a spherical cavity located in the center of a spherical hollow ball are used.","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":"83885088","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-2022-10-23-30
L. Y. Maslova, V. Krut’ko, O. Musskaya, T. V. Safronova, A. Kulak
By firing polyurethane foam templates (“STR” brand, 12 pores per cm, China) with a porosity of ~ 65 % at 1200 °С, an open-pore calcium phosphate foam ceramics was obtained using a highly concentrated suspension based on synthetic hydroxyapatite, heat-treated at 800 °С, monocalcium phosphate monohydrate and 0.8 % polyvinyl alcohol. The resulting calcium phosphate foam ceramics after modification in the SBF (Simulated Body Fluid) solution concentrated 5 times (SBF×5) consisted of β-tricalcium phosphate, β-calcium pyrophosphate and biomimetic apatite, had a porosity of 53 – 59 % and a static strength of ~ 0.05 MPa. The formed biomimetic apatite, consisting of amorphous calcium phosphate Ca9(PO4)6 and apatite tricalcium phosphate Ca9HPO4(PO4)5OH, crystallizes into β-tricalcium phosphate at 1200 °С. Calcium phosphate foam ceramics modified with biomimetic apatite, after soaking in 5 % hydroxyapatite gel and SBF×5, which simulating a bone defect in vitro, in parallel with the formation of biomimetic apatite, is partially destroyed, which confirmed its high bioactivity and degradation.
{"title":"Formation of biomimetic apatite on calcium phosphate foam ceramics in the concentrated model solution","authors":"L. Y. Maslova, V. Krut’ko, O. Musskaya, T. V. Safronova, A. Kulak","doi":"10.30791/1028-978x-2022-10-23-30","DOIUrl":"https://doi.org/10.30791/1028-978x-2022-10-23-30","url":null,"abstract":"By firing polyurethane foam templates (“STR” brand, 12 pores per cm, China) with a porosity of ~ 65 % at 1200 °С, an open-pore calcium phosphate foam ceramics was obtained using a highly concentrated suspension based on synthetic hydroxyapatite, heat-treated at 800 °С, monocalcium phosphate monohydrate and 0.8 % polyvinyl alcohol. The resulting calcium phosphate foam ceramics after modification in the SBF (Simulated Body Fluid) solution concentrated 5 times (SBF×5) consisted of β-tricalcium phosphate, β-calcium pyrophosphate and biomimetic apatite, had a porosity of 53 – 59 % and a static strength of ~ 0.05 MPa. The formed biomimetic apatite, consisting of amorphous calcium phosphate Ca9(PO4)6 and apatite tricalcium phosphate Ca9HPO4(PO4)5OH, crystallizes into β-tricalcium phosphate at 1200 °С. Calcium phosphate foam ceramics modified with biomimetic apatite, after soaking in 5 % hydroxyapatite gel and SBF×5, which simulating a bone defect in vitro, in parallel with the formation of biomimetic apatite, is partially destroyed, which confirmed its high bioactivity and degradation.","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":"78487644","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-2022-3-78-86
E. Trofimchuk, M. A. Moskvina, V. Shevchenko, N. Nikonorova
A nanocomposite based on high-density polyethylene with barium titanate (content of 13 – 15 wt. %) was obtained as a result of low-temperature synthesis of the inorganic component directly in the mesopores of an oriented polymer matrix using the sol-gel method followed by hydrothermal treatment in an alkaline medium. Crystallization of barium titanate in nanopores is detected by X-ray phase analysis and electron microscopy to occur mainly in a cubic crystalline modification with an average crystallite size of 16 nm and to form chain structures. A comparative assessment of the dielectric properties of a polymer nanocomposite and powder barium titanate synthesized under similar conditions is carried out.
{"title":"Low-temperature synthesis of barium titanate in the mesoporous polyethylene matrices","authors":"E. Trofimchuk, M. A. Moskvina, V. Shevchenko, N. Nikonorova","doi":"10.30791/1028-978x-2022-3-78-86","DOIUrl":"https://doi.org/10.30791/1028-978x-2022-3-78-86","url":null,"abstract":"A nanocomposite based on high-density polyethylene with barium titanate (content of 13 – 15 wt. %) was obtained as a result of low-temperature synthesis of the inorganic component directly in the mesopores of an oriented polymer matrix using the sol-gel method followed by hydrothermal treatment in an alkaline medium. Crystallization of barium titanate in nanopores is detected by X-ray phase analysis and electron microscopy to occur mainly in a cubic crystalline modification with an average crystallite size of 16 nm and to form chain structures. A comparative assessment of the dielectric properties of a polymer nanocomposite and powder barium titanate synthesized under similar conditions is carried out.","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":"75136222","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}
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