Carbon content-dependent microstructures, surface characteristics and thermal stability of mechanical alloying derived SiBCN powders. Issue 4 (March 2018)

• Record Type: Journal Article
• Authors: Li, Daxin; Yang, Zhihua; Jia, Dechang; Duan, Xiaoming; Zhou, Yu; Yu, Dongli; Tian, Yongjun; Wang, Zihuan; Liu, Yinglong
• Is Part Of: Ceramics international. Volume 44:Issue 4(2018)
• Page Start: 3614
• Page End: 3624
• Publication Date: 2018-03
• Subjects: Mechanical alloying -- Solid-state amorphization -- SiBCN -- Thermal stability -- TEM; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2017.11.106
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Three types of SiBCN: carbon-lean, -moderate and -rich powders with the same Si/B/N mole ratio were subjected to high-energy ball milling to yield an amorphous structure. The effects of carbon content on microstructures, solid-state amorphization, surface characteristics and thermal stability of the as-milled powders were studied in detail. Results showed that the increases in carbon content can drive solid-state amorphization accompanied by strain-induced, crystallite refinement-induced and/or chemical composition-induced nucleation of nano-SiC from an amorphous body. The specific surface area increases as carbon content increases. The amorphous networks of Si–C, C–B/C–C, C–N, B–N and C–B–N bonds that compose the amorphous nature, but the species and contents of the chemical bonds are carbon content-dependent. Carbon-moderate powders possess satisfying thermal stability while carbon-rich ones perform the worst. Mechanical alloying derived SiBCN powders have outstanding oxidation resistance below 800 °C; however only carbon-moderate powders show desirable anti-oxidation ability at higher temperatures. Thus, mechanical alloying of SiBCN appears a suitable technique for developing amorphous matrix materials for practical applications.