Pub Date : 1900-01-01DOI: 10.30791/0015-3214-2022-1-5-15
Е. K. Belonogov, S. Kuschev, М. P. Sumets, D. Serikov, А. А. Grebennikov, V. Dybov, А. Kostyuchenko, Т. L. Turaeva
In the present work, the phase compositions, morphology, structure, and thermal conductivity of Bi2Te3 – хSeх-based semiconductor wafers before and after the photon treatment (PT) were investigated by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and laser flash methods. The semiconductor plates 10 × 10 × 2 mm in size were prepared by electric discharge cutting from the briquettes, synthesized by hot pressing of Bi2Te3 – хSeх powder. Then, the plates were annealed at 570 K in an argon atmosphere for 24 h. The PT was carried out in an Ar atmosphere by irradiation of gas-discharge xenon lamps with pulses of 1.0 and 1.4 s and energy density ranging from 125 to 175 J/cm2. As revealed, the PT initiates the formation of a thin surface layer with an inhomogeneous nanocrystalline structure and an arbitrary nanocrystals orientation. The volume of material manifests a large-block textured crystalline structure with the original elemental and phase compositions formed during the extrusion. Thereby, a gradient nanostructured region composed of nano-sized and large Bi2Te3 – хSeх crystals with tunneling contacts is formed in the process of PT. We revealed that the PT changes the material bandgap slightly, decreases the concentration of charge carriers, increasing their mobility. The scattering of carriers and photons on linear defects dominates in a wide temperature range in the studied samples. Thereby, the figure of merit rise s by 8 % after PT, due to a decrease in the phonon component of thermal conductivity.
{"title":"The effect of photonic processing on increasing the thermoelectric Q-factor of a solid solution Bi2Te3 – Bi2Se3","authors":"Е. K. Belonogov, S. Kuschev, М. P. Sumets, D. Serikov, А. А. Grebennikov, V. Dybov, А. Kostyuchenko, Т. L. Turaeva","doi":"10.30791/0015-3214-2022-1-5-15","DOIUrl":"https://doi.org/10.30791/0015-3214-2022-1-5-15","url":null,"abstract":"In the present work, the phase compositions, morphology, structure, and thermal conductivity of Bi2Te3 – хSeх-based semiconductor wafers before and after the photon treatment (PT) were investigated by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and laser flash methods. The semiconductor plates 10 × 10 × 2 mm in size were prepared by electric discharge cutting from the briquettes, synthesized by hot pressing of Bi2Te3 – хSeх powder. Then, the plates were annealed at 570 K in an argon atmosphere for 24 h. The PT was carried out in an Ar atmosphere by irradiation of gas-discharge xenon lamps with pulses of 1.0 and 1.4 s and energy density ranging from 125 to 175 J/cm2. As revealed, the PT initiates the formation of a thin surface layer with an inhomogeneous nanocrystalline structure and an arbitrary nanocrystals orientation. The volume of material manifests a large-block textured crystalline structure with the original elemental and phase compositions formed during the extrusion. Thereby, a gradient nanostructured region composed of nano-sized and large Bi2Te3 – хSeх crystals with tunneling contacts is formed in the process of PT. We revealed that the PT changes the material bandgap slightly, decreases the concentration of charge carriers, increasing their mobility. The scattering of carriers and photons on linear defects dominates in a wide temperature range in the studied samples. Thereby, the figure of merit rise s by 8 % after PT, due to a decrease in the phonon component of thermal conductivity.","PeriodicalId":366423,"journal":{"name":"Physics and Chemistry of Materials Treatment","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115201345","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 : 1900-01-01DOI: 10.30791/0015-3214-2022-1-57-65
G. A. Pribytkov, V. Korzhova, I. Firsina, A. V. Baranovskii, E. Korosteleva
The combustion synthesis products in titanium, silicon and aluminum powder mixtures under the wave mode combustion are investigated by X-ray diffraction analysis and optical metallography. The synthesis products contain titanium silicide Ti5Si3 and titanium aluminide TiAl3, the ratio of which depends on the content of aluminum powder in the reaction mixtures. The combustion temperature of the mixtures decreases with an increase in the aluminum content. This is a consequence of the substitution of titanium aluminide in the synthesis products for titanium silicide, which has a multiple negative formation enthalpy compared to that of the silicide. Using ideas about the features of the growth of silicide and aluminide nuclei in a liquid metal solution, the effect of the combustion temperature on the dispersion of the structure of the synthesis products is discussed.
{"title":"Study of gasless combustion products of Ti – Si – Al powder mixtures","authors":"G. A. Pribytkov, V. Korzhova, I. Firsina, A. V. Baranovskii, E. Korosteleva","doi":"10.30791/0015-3214-2022-1-57-65","DOIUrl":"https://doi.org/10.30791/0015-3214-2022-1-57-65","url":null,"abstract":"The combustion synthesis products in titanium, silicon and aluminum powder mixtures under the wave mode combustion are investigated by X-ray diffraction analysis and optical metallography. The synthesis products contain titanium silicide Ti5Si3 and titanium aluminide TiAl3, the ratio of which depends on the content of aluminum powder in the reaction mixtures. The combustion temperature of the mixtures decreases with an increase in the aluminum content. This is a consequence of the substitution of titanium aluminide in the synthesis products for titanium silicide, which has a multiple negative formation enthalpy compared to that of the silicide. Using ideas about the features of the growth of silicide and aluminide nuclei in a liquid metal solution, the effect of the combustion temperature on the dispersion of the structure of the synthesis products is discussed.","PeriodicalId":366423,"journal":{"name":"Physics and Chemistry of Materials Treatment","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121971553","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 : 1900-01-01DOI: 10.30791/0015-3214-2019-4-12-20
A. Samokhin, A. Fadeev, N. Alekseev, M. A. Sinaysky, V. Sufiyarov, E. Borisov, O. Korznikov, T. Fedina, G. S. Vodovozova, S. V. Baryshkov
{"title":"Spheroidization of the Fe-based powders in an electroarc plasmotron plasma stream and application of these powders in selective laser melting","authors":"A. Samokhin, A. Fadeev, N. Alekseev, M. A. Sinaysky, V. Sufiyarov, E. Borisov, O. Korznikov, T. Fedina, G. S. Vodovozova, S. V. Baryshkov","doi":"10.30791/0015-3214-2019-4-12-20","DOIUrl":"https://doi.org/10.30791/0015-3214-2019-4-12-20","url":null,"abstract":"","PeriodicalId":366423,"journal":{"name":"Physics and Chemistry of Materials Treatment","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129053029","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 : 1900-01-01DOI: 10.30791/0015-3214-2021-4-42-49
G. Kobylyansky, А. О. Mazaev, Е. А. Zvir, S. Eremin, Е. V. Chertopyatov, А. V. Obukhov
Presented are the results of mechanical tensile tests of longitudinal (segmental) samples cut from the midsection of claddings spent as VVER-1000 FA during one- and six-year campaigns and subject to thermal tests in helium at 480 °С during 468 full days. An average burnup of these fuel rods achieved ~ 20 and ~ 70 (MW·day)/kg U, respectively. The tests followed the examinations for cladding mechanical properties performed using the tests results for ring samples cut from the specified fuel rods. These fuel rods were tested in the experiments to determine impact of long-term thermal tests that model dry storage conditions on mechanical properties of Zr E110 claddings. Based on mechanical tests results at room temperature and at 380 °С there was determined as follows: ultimate strength sв, yield strength s0,2 and total relative elongation d0 of claddings length-wise on the fuel rod segments at the fuel column midsection. The obtained characteristics were compared to corresponding values for initial (unirradiated) cladding tubes and mechanical test results of the ring samples in the transverse direction. Long-term thermal tests have led to partial return to initial (before operation) values sв, s0,2 and d0 of radiation-hardened claddings; this return was more prominent in the longitudinal direction than in the transverse one. A radiation hardening decrease was accompanied with an increase in total relative elongation values in both cladding directions. Anisotropy of yield strength has changed as well. These changes can be explained by partial annealing of radiation defects, which are obstacles to dislocation movements during cladding strain. The morphology of above radiation defects is different in various sliding planes in texturized grains of cladding material.
{"title":"The effect of long-term annealing simulating the parameters of dry storage of VVER-1000 fuel rods on the mechanical properties of E110 alloy shells in the longitudinal direction","authors":"G. Kobylyansky, А. О. Mazaev, Е. А. Zvir, S. Eremin, Е. V. Chertopyatov, А. V. Obukhov","doi":"10.30791/0015-3214-2021-4-42-49","DOIUrl":"https://doi.org/10.30791/0015-3214-2021-4-42-49","url":null,"abstract":"Presented are the results of mechanical tensile tests of longitudinal (segmental) samples cut from the midsection of claddings spent as VVER-1000 FA during one- and six-year campaigns and subject to thermal tests in helium at 480 °С during 468 full days. An average burnup of these fuel rods achieved ~ 20 and ~ 70 (MW·day)/kg U, respectively. The tests followed the examinations for cladding mechanical properties performed using the tests results for ring samples cut from the specified fuel rods. These fuel rods were tested in the experiments to determine impact of long-term thermal tests that model dry storage conditions on mechanical properties of Zr E110 claddings. Based on mechanical tests results at room temperature and at 380 °С there was determined as follows: ultimate strength sв, yield strength s0,2 and total relative elongation d0 of claddings length-wise on the fuel rod segments at the fuel column midsection. The obtained characteristics were compared to corresponding values for initial (unirradiated) cladding tubes and mechanical test results of the ring samples in the transverse direction. Long-term thermal tests have led to partial return to initial (before operation) values sв, s0,2 and d0 of radiation-hardened claddings; this return was more prominent in the longitudinal direction than in the transverse one. A radiation hardening decrease was accompanied with an increase in total relative elongation values in both cladding directions. Anisotropy of yield strength has changed as well. These changes can be explained by partial annealing of radiation defects, which are obstacles to dislocation movements during cladding strain. The morphology of above radiation defects is different in various sliding planes in texturized grains of cladding material.","PeriodicalId":366423,"journal":{"name":"Physics and Chemistry of Materials Treatment","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123924383","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 : 1900-01-01DOI: 10.30791/0015-3214-2021-5-22-29
A. V. Liushinskii, V. N. Petrovskii, V. N. Yolkin
Specific features of the influence of laser processing applied to surfaces of 12Cr18Ni10Ti stainless steel samples on formation of bonding by the diffusion welding are considered. The laser fluency was 2.1; 3.2 and 4.3 J/sm2, the diameter of spot was 220 µm. The beam scanning was carried out both in one direction and in two perpendicular directions. As a result of the laser processing with different mode parameters, there on their surfaces are formed microroughnesses of different heights. The researches demonstrated that the size of these microroughnesses is the main factor having an influence on the strength of welded joints. It agrees well with the data of experiments carried out earlier. The preliminary laser treatment of welding surfaces before diffusion welding brings a possibility to lower the temperature of a diffusion bonding process.
{"title":"Effect of preliminary laser treatment of 12Cr18Ni10Ti steel surfaces on their diffusion welding","authors":"A. V. Liushinskii, V. N. Petrovskii, V. N. Yolkin","doi":"10.30791/0015-3214-2021-5-22-29","DOIUrl":"https://doi.org/10.30791/0015-3214-2021-5-22-29","url":null,"abstract":"Specific features of the influence of laser processing applied to surfaces of 12Cr18Ni10Ti stainless steel samples on formation of bonding by the diffusion welding are considered. The laser fluency was 2.1; 3.2 and 4.3 J/sm2, the diameter of spot was 220 µm. The beam scanning was carried out both in one direction and in two perpendicular directions. As a result of the laser processing with different mode parameters, there on their surfaces are formed microroughnesses of different heights. The researches demonstrated that the size of these microroughnesses is the main factor having an influence on the strength of welded joints. It agrees well with the data of experiments carried out earlier. The preliminary laser treatment of welding surfaces before diffusion welding brings a possibility to lower the temperature of a diffusion bonding process.","PeriodicalId":366423,"journal":{"name":"Physics and Chemistry of Materials Treatment","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123488087","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 : 1900-01-01DOI: 10.30791/0015-3214-2019-1-19-26
G. A. Pribytkov, V. I. Kalita, D. I. Komlev, A. Baranovskiy, A. Radyuk, M. Krinitcyn, A. Ivannikov, V. Korzhova, A. B. Mikhaylova
{"title":"Structure and wear resistance of the coatings plasma sprayed with “TiC+high chromium cast iron binder” composite powder","authors":"G. A. Pribytkov, V. I. Kalita, D. I. Komlev, A. Baranovskiy, A. Radyuk, M. Krinitcyn, A. Ivannikov, V. Korzhova, A. B. Mikhaylova","doi":"10.30791/0015-3214-2019-1-19-26","DOIUrl":"https://doi.org/10.30791/0015-3214-2019-1-19-26","url":null,"abstract":"","PeriodicalId":366423,"journal":{"name":"Physics and Chemistry of Materials Treatment","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114821786","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 : 1900-01-01DOI: 10.30791/0015-3214-2019-4-70-77
E. N. Sidorova, A. Ten, I. A. Iliinykh, E. Dzidziguri
{"title":"Correlation between the characteristics of initial and end materials of copper nanopowder","authors":"E. N. Sidorova, A. Ten, I. A. Iliinykh, E. Dzidziguri","doi":"10.30791/0015-3214-2019-4-70-77","DOIUrl":"https://doi.org/10.30791/0015-3214-2019-4-70-77","url":null,"abstract":"","PeriodicalId":366423,"journal":{"name":"Physics and Chemistry of Materials Treatment","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126293085","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 : 1900-01-01DOI: 10.30791/0015-3214-2023-1-64-74
A. S. Baikin, E. O. Nasakina, A. Kolmakov, K. V. Sergienko, M. Sudarchikova, M. Sevostyanov
The unique set of properties of coatings based on CeO2 has long been used in many industries. But the range of their potential application is no less wide, especially in view of the discovery of new properties. Magnetron deposition technology expands the area of possible application of coatings based on CeO2, making it possible to obtain products of various sizes and geometries. This review presents the parameters of magnetron sputtering of coatings based on cerium dioxide, their relationship with the structure and key properties of these coatings. The influence of the type of target, the introduction of oxygen into the sputtering medium, changes in the sputtering power, bias voltage, type of substrate and its temperature on the structure, mechanical properties, and hydrophobicity are considered.
{"title":"Properties of coatings based on cerium dioxide produced by magnetron sputtering","authors":"A. S. Baikin, E. O. Nasakina, A. Kolmakov, K. V. Sergienko, M. Sudarchikova, M. Sevostyanov","doi":"10.30791/0015-3214-2023-1-64-74","DOIUrl":"https://doi.org/10.30791/0015-3214-2023-1-64-74","url":null,"abstract":"The unique set of properties of coatings based on CeO2 has long been used in many industries. But the range of their potential application is no less wide, especially in view of the discovery of new properties. Magnetron deposition technology expands the area of possible application of coatings based on CeO2, making it possible to obtain products of various sizes and geometries. This review presents the parameters of magnetron sputtering of coatings based on cerium dioxide, their relationship with the structure and key properties of these coatings. The influence of the type of target, the introduction of oxygen into the sputtering medium, changes in the sputtering power, bias voltage, type of substrate and its temperature on the structure, mechanical properties, and hydrophobicity are considered.","PeriodicalId":366423,"journal":{"name":"Physics and Chemistry of Materials Treatment","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121604580","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 : 1900-01-01DOI: 10.30791/0015-3214-2020-5-44-48
D. Gerasimov, A. Sivkov
The possibility of obtaining a superhard plasma coating based on titanium, nitrogen and carbon on a metal substrate in a nitrogen atmosphere is shown. The coatings were deposited in one short-term accelerator operation cycle under the action of a hyperspeed jet of electroerosive Ti-containing plasma on the substrate surface. It has been shown by SEM and XRD that nanostructured layers of titanium nitride and titanium carbonitride are formed, providing a high hardness of the coating. Plasma coatings deposited in a nitrogen atmosphere have a higher hardness (19.6 GPa) than coatings deposited in air (16.2 GPa), which is due to a higher content of nitride crystalline phases in the coating material. XRD data showed that the coherent-scattering region of crystalline phases in coatings deposited in an atmosphere of air and in a nitrogen atmosphere is ~10-40 nm, which confirms the nanostructuring of all crystalline phases presented in the coating.
{"title":"Deposition of superhard Ti-C-N plasma coatings in nitrogen atmosphere","authors":"D. Gerasimov, A. Sivkov","doi":"10.30791/0015-3214-2020-5-44-48","DOIUrl":"https://doi.org/10.30791/0015-3214-2020-5-44-48","url":null,"abstract":"The possibility of obtaining a superhard plasma coating based on titanium, nitrogen and carbon on a metal substrate in a nitrogen atmosphere is shown. The coatings were deposited in one short-term accelerator operation cycle under the action of a hyperspeed jet of electroerosive Ti-containing plasma on the substrate surface. It has been shown by SEM and XRD that nanostructured layers of titanium nitride and titanium carbonitride are formed, providing a high hardness of the coating. Plasma coatings deposited in a nitrogen atmosphere have a higher hardness (19.6 GPa) than coatings deposited in air (16.2 GPa), which is due to a higher content of nitride crystalline phases in the coating material. XRD data showed that the coherent-scattering region of crystalline phases in coatings deposited in an atmosphere of air and in a nitrogen atmosphere is ~10-40 nm, which confirms the nanostructuring of all crystalline phases presented in the coating.","PeriodicalId":366423,"journal":{"name":"Physics and Chemistry of Materials Treatment","volume":"55 94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131916600","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 : 1900-01-01DOI: 10.30791/0015-3214-2021-2-72-79
V. Artyukh, V. Borshch, V. Yusupov, S. Zhuk, V. Zelensky, B. Belelyubsky
Powders of catalysts from aluminides Fe and Co on a SiO2 support (33.3 wt. %) were obtained by mechano-thermal synthesis. The formation of large powder fractions (> 100 μm) was experimentally established. The fractions of these fractions for Fe – Al – SiO2 and Co – Al – SiO2 respectively amounted to ~ 43 % and ~ 55 %, which is a positive result for further catalytic studies. After annealing the powders at 700 and 900 °C in vacuum, the SiO2 support and compounds: Co27Al73 (close in composition to CoAl3, Co4Al13 type intermetallic compounds), Fe3Al intermetallic compound with iron silicide type Fe0.9Si0.1 and compound Al0,3Fe3Si0.7 in small volumes. On the synthesis of cobalt aluminides, a conclusion has been made about more efficient annealing at 900 °C than at 700 °C. For Fe – Al – SiO2 powders, it is advisable to anneal in the temperature range 700 – 750 °C with the assumption that the SiO2 support influences the thermosynthesis of iron aluminides. An experimental analysis of the morphology and elemental composition of the surface of the obtained samples is presented. It was found that the catalyst powders have medium sphericity and angularity. Fe – Al – SiO2 powders have a more developed surface than Co – Al – SiO2. Lower intermetallics are predominantly formed on the surface of the Co – Al – SiO2 sample. The correction of the mechanical alloying modes by means of the fragmentation of the process, changes in the intensity of its parameters, and various annealing conditions for Co – Al – SiO2 and Fe – Al – SiO2 are proposed.
采用机械-热合成的方法，在SiO2载体(33.3% wt. %)上制备了Fe和Co铝化物催化剂粉末。实验结果表明，该材料可形成较大的粉末组分(> 100 μm)。这些馏分中Fe - Al - SiO2和Co - Al - SiO2的馏分分别达到~ 43%和~ 55%，为进一步的催化研究提供了积极的结果。粉末在700°C和900°C真空退火后，小体积的SiO2支持物和化合物:Co27Al73(成分接近于CoAl3, Co4Al13型金属间化合物)，Fe3Al与硅化铁的金属间化合物Fe0.9Si0.1和化合物Al0,3Fe3Si0.7。在合成钴铝化物时，900℃退火比700℃退火更有效。对于Fe - Al - SiO2粉末，假设SiO2载体影响铁铝化物的热合成，建议在700 - 750℃的温度范围内退火。对所得样品的表面形貌和元素组成进行了实验分析。结果表明，该催化剂粉末具有中等的球形度和角度。Fe - Al - SiO2粉体比Co - Al - SiO2粉体具有更发达的表面。低金属间化合物主要形成于Co - Al - SiO2样品表面。提出了Co - Al - SiO2和Fe - Al - SiO2机械合金化过程的破碎化、参数强度的变化以及不同退火条件对机械合金化模式的修正。
{"title":"Synthesis of Al – Fe/SiO2 and Al – Co/SiO2 catalysts by solid-phase method","authors":"V. Artyukh, V. Borshch, V. Yusupov, S. Zhuk, V. Zelensky, B. Belelyubsky","doi":"10.30791/0015-3214-2021-2-72-79","DOIUrl":"https://doi.org/10.30791/0015-3214-2021-2-72-79","url":null,"abstract":"Powders of catalysts from aluminides Fe and Co on a SiO2 support (33.3 wt. %) were obtained by mechano-thermal synthesis. The formation of large powder fractions (> 100 μm) was experimentally established. The fractions of these fractions for Fe – Al – SiO2 and Co – Al – SiO2 respectively amounted to ~ 43 % and ~ 55 %, which is a positive result for further catalytic studies. After annealing the powders at 700 and 900 °C in vacuum, the SiO2 support and compounds: Co27Al73 (close in composition to CoAl3, Co4Al13 type intermetallic compounds), Fe3Al intermetallic compound with iron silicide type Fe0.9Si0.1 and compound Al0,3Fe3Si0.7 in small volumes. On the synthesis of cobalt aluminides, a conclusion has been made about more efficient annealing at 900 °C than at 700 °C. For Fe – Al – SiO2 powders, it is advisable to anneal in the temperature range 700 – 750 °C with the assumption that the SiO2 support influences the thermosynthesis of iron aluminides. An experimental analysis of the morphology and elemental composition of the surface of the obtained samples is presented. It was found that the catalyst powders have medium sphericity and angularity. Fe – Al – SiO2 powders have a more developed surface than Co – Al – SiO2. Lower intermetallics are predominantly formed on the surface of the Co – Al – SiO2 sample. The correction of the mechanical alloying modes by means of the fragmentation of the process, changes in the intensity of its parameters, and various annealing conditions for Co – Al – SiO2 and Fe – Al – SiO2 are proposed.","PeriodicalId":366423,"journal":{"name":"Physics and Chemistry of Materials Treatment","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128926540","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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