Fabrication of SiC fibres from yttrium-containing polycarbosilane
- 材料学院－已发表论文 
The yttrium as a sintering aid was introduced into polycarbosilane (PCS) to prepare yttrium-containing PCS (PYCS). Two types of yttrium-containing SiC fibres, the SiC(OY) fibres and the SiC(Y) fibres, were fabricated with PYCS. The structural evolution and the associated properties on changing from SiC(OY) to SiC(Y) fibres during the sintering process were studied. The chemical composition of the SiC(OY) fibres is SiC1.53O0.22Y0.005 with an amorphous structure. The composition of SiC(Y) fibres is SiC1.23O0.05Y0.005. The fibres are composed of a large number of beta-SiC crystallites with a size of 50 nm and a small amount of alpha-SiC crystalline. The tensile strength and fracture toughness of the SiC(OY) fibres are 2.25 GPa and 2.37 MPa.m(1/2), respectively, and 1.61 GPa, 1.91 MPa.m(1/2), respectively for SiC(Y) fibres. The SiC(Y) fibres have a higher thermal stability than the SiC(OY) fibres.
CitationTRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA，2012.22（4）：879-886