Abstract
Continuous ceramic fiber comprising silicon carbide–zirconium carbide (SiC–ZrC) binary phases was obtained through melt spinning, electron-beam curing and pyrolysis of a pre-ceramic precursor of polyzirconocenecarbosilanes (PZCS). After pyrolysis and heat treatment, ZrC particles with mean diameters of 15–20 nm were formed and homogeneously dispersed in a matrix of fine crystalline β-SiC with an average grain size of 6–10 nm. Concentration of Zr in the fiber varies from 14.88% to 17.45% by mass. Fibers consisting of near-stoichiometric ZrC and SiC with little free carbon can be obtained through pyrolysis decarbonization of the as-cured fiber in hydrogen from room temperature to 1000 °C, and subsequently heat treatment in argon up to 1600 °C for 1 h. High-temperature treatment of these amorphous inorganic fibers leads to crystallization of the binary phases of β-SiC and ZrC. The removal of free carbon under hydrogen results in more rapid growth of β-SiC and ZrC crystals, in which obvious aggregation of the dispersed ZrC particles among the continuous β-SiC matrix can be ascribed to a fast migration of Zr cation.
Highlights
Silicon carbide (SiC) fiber synthesized from polycarbosilane is one of the most important reinforcements for ceramic matrix composites (CMCs), which are finding more and more applications to meet harsh environments of high temperature and air-oxidation such as turbo-engine blades in aerospace industry [1,2,3,4,5]
Thesehas been investig as that catalyst during dechlorination of as dichloromethylsilanes b transition metal carbides may act as metallocenes reinforcements improve thesurface creep resistance as well the the first time, we have shown a metallocene catalytic insertion polymerization of thermal and oxidation resistance of the SiC ceramic [18]
Oxidation curing will inevitably and in-homogenously homogenously introduce oxygen into the polymeric fibers, which leads to a silicon-carbon-oxygen introduce oxygen into the polymeric fibers, which leads to a silicon-carbon-oxygen complex formation complex formation in the organic fiber after pyrolysis
Summary
Silicon carbide (SiC) fiber synthesized from polycarbosilane is one of the most important reinforcements for ceramic matrix composites (CMCs), which are finding more and more applications to meet harsh environments of high temperature and air-oxidation such as turbo-engine blades in aerospace industry [1,2,3,4,5]. Some high-melting carbides and borides such as zirconium and or introduction of non-soluble secondary phase with a higher precipitation hafnium are an essential prerequisite for using as resistance to creep in SiC fiber. Thesehas been investig as that catalyst during dechlorination of as dichloromethylsilanes b transition metal carbides may act as metallocenes reinforcements improve thesurface creep resistance as well the the first time, we have shown a metallocene catalytic insertion polymerization of thermal and oxidation resistance of the SiC ceramic [18].
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