Thermal transformation of nanohafniumcarbosilanes. Issue 1 (January 2019)

• Record Type: Journal Article
• Authors: Shcherbakova, Galina I.; Blokhina, Mariya Kh.; Storozhenko, Pavel A.; Zhigalov, Dmitrii V.; Varfolomeev, Maxim S.; Drachev, Aleksander I.; Yurkov, Gleb Yu.
• Is Part Of: Ceramics international. Volume 45:Issue 1(2019)
• Page Start: 122
• Page End: 130
• Publication Date: 2019-01
• Subjects: Nanohafniumcarbosilanes -- Silicon -- Hafnium -- Ceramics -- Carbides -- Oxides; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2018.09.142
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The process of thermochemical transformation of nanohafniumcarbosilane (nano-HfCS) at 1500 °C in various media was investigated. The regularities of the formation of SiC ceramic structures modified with hafnium compounds were analyzed by physicochemical methods.The two-stage thermochemical transformation of nano-HfCS first at 1100 °C in argon and then at 1500 °C in various media: argon, nitrogen, vacuum, air results in formation of a nanocrystalline α-SiC ceramics with a hexagonal crystal lattice, modified with HfC, as the main phase. It is demonstrated that the medium in which pyrolysis of nano-HfCS is carried out at 1500 °C affects only the surface layer of the resulting ceramics: at pyrolysis in argon, carbon oxides and hafnium are produced as additional phases on the surface; in nitrogen, silicon nitride and carbon are formed as additional phases on the surface, and in air SiO2 and carbon are formed on the surface as additional phases. Graphical abstract: