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M.V. Fedorov et al. / Procedia Structural Integrity 40 (2022) 145–152 Fedorov M.V., Vasilieva M.I. / Structural Integrity Procedia 00 (2022) 000 – 000

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5. Conclusion. In this experimental investigation of ultradispersed spinel powder phase transitions during solid-phase sintering, the following conclusions can be drawn: 1. Micro X-ray spectral and X-ray phase analysis revealed that ultradispersed spinel powder consists of spinel phases, periclase, layered double hydroxides and an insignificant amount of impurities. 2. Thermal analysis of the spinel UDP from room temperature to 1450 ○ C revealed the formation of new phases; subsequent X-ray phase analysis of spinel UDP at 600, 1000, 1450 ○ C determined a decomposition of layered double hydroxides into stoichiometric spinel and double oxides - periclase. Acknowledgements The authors express their sincere gratitude to the staff of IGABM SB RAS for carrying out X-ray microscopic, thermal, and X-ray phase analysis References Betextin, A.G., 1950. Mineralogiya [Mineralogy]. Gosudarstvennoe izdatelstvo geologicheskoj literatury, Moskva, pp. 956. [in Russian]. Booking, A.S., Drits, V.A. 1993. Polytype diversity of the hydrotalcite-like minerals. I. Possible polytypes and their diffraction features. Clay and Clay Minerals 41(5). 551 – 557. DOI: 10.1346/CCMN.1993.0410504. Braulio, A.L., Rigaud, M., Buhr A., Parr, C., Pandolfelli, V.C., 2011. Spinel-containing alumina based refractory castables. Ceramics International 37(6). 1705 – 1724. DOI:10.1016/j.ceramint.2011.03.049. Byakova, A. V., Gorbach, V. G., Vlasov, A. A., (1993). Strukturnye aspekty povysheniya rabotosposobnosti pokrytij iz vysokoprochnyx materialov [Structural aspects of improving the performance of coatings made of high-strength materials]. Problemy prochnosti Strength problems 9. 48 – 55. [in Russian]. Duan, X., Evans, D.G., 2006. Layered double hydroxides. Structure and bonding (Vol. 119). Springer, New York, pp. 242. Fajkov, P.P., 2007. Sintez i spekaemost poroshkov v sisteme MgOAl2O3, poluchennyx zol-gel metodom [Synthesis and sintering ability of powders in the MgOAl2O3 system obtained by the sol- gel method]. Candidate’ s thesis. Moscow, pp. 165. [in Russian]. Forano, C., Hibino, T., Leroux, F., & Taviot- Guého, C., 2006 . Layered double hydroxides. In F. Bergaya, B. K. G.Theng, & G. Lagaly (Eds.), Handbook of clay science. Elsevier, Amsterdam. 1021 – 1095. DOI:10.1016/S1572-4352(05)01039-1. Gabelkov, S.V., Tarasov, R.V., Poltavcev, N.S., 2011. Evolyuciya fazovogo sostava pri termicheskom razlozhenii gidroksida magniya [Evolution of the phase composition during thermal decomposition of magnesium hydroxide]. Voprosy atomnoj nauki i texniki 2 [Atomic Science and Technology Issues 2]. 72 – 76. [in Russian]. Gorshkov, V.S., Savelev, V.G., Fedorov, N.F., 1988. Fizicheskaya ximiya silikatov i drugix tugoplavkix soedinenij [Physical chemistry of silicates and other refractory compounds]. Vyssh. shk., Moscow, pp. 400. [in Russian]. Loktev, D., 2005. Nanostrukturnye pokrytiya vysokoproizvoditelnogo instrumenta [Nanostructured coatings of a high-performance tool]. Mir texniki i texnologij 10 [World of technology and technology 10]. P. 62 – 65. [in Russian]. Mazzonia, A.D., Sainzb, M.A., Caballerob, A., Aglietti, E.F., 2002. Formation and sintering of spinels (MgAl2O4) in reducing atmospheres. Materials Chemistry and Physics 78. 30 – 37. DOI:10.1016/S0254-0584(02)00333-4. Nakagawa, Z., Enemoto, Yi In-Suk, Asano, K., 1995. Effect of corundum/periclase sizes on expansion behavior during synthesis of spinel. In: Proceedings of UNITECR 95, Kyoto, Japan. 379 – 386. Samotugin, S. S., Mazur, V. A., Sheremeta, O. N., Gagarin, V. A., 2007. Kompleksnoe uprochnenie stalnogo i tverdosplavnogo instrumenta [Complex hardening of steel and carbide tools]. Biznes: promyshlennost i texnologii 4 [Business: industry and technology 4]. P. 16 – 18. [in Russian]. Shaskolskaya, M.P., 1984. Kristallografiya [Crystallography]. Vysshaya shkola, Moscow, pp. 351. [in Russian].