Effect of boron incorporation on the phase composition and high-temperature behavior of polymer-derived silicon carbide. Issue 4 (March 2016)

• Record Type: Journal Article
• Authors: Kaur, Sarabjeet; Mera, Gabriela; Riedel, Ralf; Ionescu, Emanuel
• Is Part Of: Journal of the European Ceramic Society. Volume 36:Issue 4(2016)
• Page Start: 967
• Page End: 977
• Publication Date: 2016-03
• Subjects: Polyborocarbosilane -- Single-source precursor -- Polymer-derived ceramics (PDCs) -- Silicon carbide -- Pressureless preparation; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2015.11.037
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: Within the present work, boron-containing silicon carbide (SiBC) powders and monoliths were prepared from a polyborocarbosilane. The main aspect addressed here relates to the fate of boron in the prepared SiBC ceramics, which has not been clarified unambiguously so far. X-ray diffraction data, corroborated with XPS, FTIR and Raman spectroscopic results indicate that boron preferably gets incorporated within the segregated carbon phase present in polycarbosilane-derived SiC; thus, the prepared SiBC samples show dispersed boron-containing carbon phases with boron contents from ca. 9 to 18 at%. Interestingly, the B-containing carbon phase does not convert into crystalline boron carbide, even upon annealing at very high temperatures and despite the high boron content. Moreover, processing details concerning the pressureless preparation of dense Si(B)C monoliths are considered in the present paper and their high temperature evolution is analyzed.