621.762

molybdenum disilicide, heat resistance, ceramic materials, protective coating.

Recommended ways to improve the chemical and physico-mechanical properties of reaction-sintered ceramic materials based on molybdenum disilicide have been described. In order to significantly increase the operating temperatures and change to more stringent operating conditions for ceramic products, it is necessary to improve existing methods of processing ceramics and significantly change the development of new ones. Various means for processing of ceramic materials have been studied and analyzed, which include the introduction of activating additives, hardening with dispersed particles, filamentary crystals and fibers and application of a protective coating to prevent rapid oxidation at surface layers. Carrying out partial purification of the initial starting components from various impurities can significantly increase some characteristics of the disilicide of molybdenum ceramics. Disilicide of molybdenum ceramics has been researched to have significant influence on the physical and mechanical properties (thermal conductivity, electrical resistance, coefficient of thermal expansion and strength) of molybdenum ceramics disilicides, which are introduced into the base material both with the initial components and in the process of its technological production. It has been established that it is possible to increase operating temperatures and ensure the use of molybdenum disilicide-based ceramic materials in harsher working conditions can be achieved by introducing of aluminum, boron, beryllium, iron, yttrium, nickel and cobalt powders into the charge, strengthening titanium coating, which includes silicification and titanium technology. It has been researched that at high temperatures and in the presence of molten silicon the synthesis and crystallization of molybdenum dicilicide occur on the grains in the surface layers, as well as dissolution and recrystallization of submicron particles of molybdenum dicilicide take place at certain depth. Based on the published data analysis and conducted research, the complex of measures for improving the chemical and physico-mechanical properties of reaction-sintered ceramic materials based on molybdenum disilicide has been proposed.

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7. . Leonid G. Kozlov, Leonid K. Polishchuk, Oleh V. Piontkevych, Roman. M.Horbatiuk, Mykola P. Korinenko, Paweł Komada, Sandugash Orazalieva, Olga Ussatova. Experimental researchcharacteristics of counterbalance valve for hydraulic drive control system of mobile machine. Przegląd elektrotechniczny. ISSN 0033-2097, R. 95. Vol 2019. No 4. рр. 104–109.
8. Fedoreiko V. S., Rutylo M. I., Lutsyk I. B., Zahorodnii R. I. Thermoelectric modules application in heat generator coherent systems. Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2014. (6). P. 111–116.
9. Dzyadykevich Yu. V., Kislyj P. S., Bochar I. Y. Sposob obrabotki karbidokremnievyh nagrevatelej, Otkrytiya. Izobreteniya. No. 44. 1991. P. 286. [In Russian].

1. Kovbashyn V., Bochar I. Perspective directions to increase heat tolerance of silicone carbid and molybdenum disilicide based materials. Scientific Journal of the Ternopol National Technical University. № 2 (82). 2016. С. 49–55.
2. Kovbashyn V., Bochar I. Method of reaction-sintered products processing based on silicon carbide and molibdenum disilicide. Scientific Journal of the Ternopol National Technical University ISSN 2522-4433. Web: visnyk.tntu.edu.ua. Вісник Тернопільського національного технічного університету. № 2 (94). 2019. С. 75–79.
3. Fedoreiko V..S., Lutsyk I..B., Iskerskyi I..S., Zagorodnii R. I Increase of energy efficiency of heat generator through batching components of burning. Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2014. (4). P. 27–32.
4. Beshta O. S., Fedoreiko V. S., Balakhontsev O. V., Khudolii S. S. Dependence of electric drive's thermal state on its operation mode. Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2014. (6). P. 67–72.
5. Buchatskyi L. M., Nadryyn Sh. N., Nahnyi A. M. Kynetyka uplotnenyia y reolohycheskye svoistva materyalov na osnove dysylytsyda molybdena v oblasty vыsokykh temperatur. Sylytsydы y ykh prymenenye v tekhnyke. K. Yn-t probl. Materyalovedenyia AN Ukrayny, 1990. Р. 55–58.
6. Buketov A., Stukhlyak P., Maruschak P., Panin S., Menou A. Regularities of impact failure of epoxy composites with Al2O3 microfiller and their analysis on the basis of external surface layer concept. Key Engineering Materials. 712. 2016. P. 149–154.
7. . Leonid G. Kozlov, Leonid K. Polishchuk, Oleh V. Piontkevych, Roman. M.Horbatiuk, Mykola P. Korinenko, Paweł Komada, Sandugash Orazalieva, Olga Ussatova. Experimental researchcharacteristics of counterbalance valve for hydraulic drive control system of mobile machine. Przegląd elektrotechniczny. ISSN 0033-2097, R. 95. Vol 2019. No 4. рр. 104–109.
8. Fedoreiko V. S., Rutylo M. I., Lutsyk I. B., Zahorodnii R. I. Thermoelectric modules application in heat generator coherent systems. Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2014. (6). P. 111–116.
9. Dzyadykevich Yu. V., Kislyj P. S., Bochar I. Y. Sposob obrabotki karbidokremnievyh nagrevatelej, Otkrytiya. Izobreteniya. No. 44. 1991. P. 286. [In Russian].