CAJ | 학술논문

将钇元素作为烧结助剂引入到聚碳硅烷(PCS)中制备含钇PCS.由含钇PCS制成siC(OY)和siC(Y)2种碳化硅纤维.对SiC(OY)纤维转变成SiC(Y)纤维的结构与相关特性的变化进行研究.SiC(OY)纤维的化学组成为SiC1.23O0.05Y0.005,纤维是无定型结构;SiC(Y)纤维含有大量的直径为50 nm的β-siC晶粒和少量的α-SiC晶粒,钇元素存在于SiC晶粒之间.SiC(OY)的拉伸强度为2.25 GPa,断裂韧性为2.37 MPa·m1/2; SiC(Y)的拉伸强度为1.61 GPa,断裂韧性为1.91 MPa·m1/2; SiC(Y)纤维比SiC(OV)纤维具有更好的热稳定性.
장을원소작위소결조제인입도취탄규완(PCS)중제비함을PCS.유함을PCS제성siC(OY)화siC(Y)2충탄화규섬유.대SiC(OY)섬유전변성SiC(Y)섬유적결구여상관특성적변화진행연구.SiC(OY)섬유적화학조성위SiC1.23O0.05Y0.005,섬유시무정형결구;SiC(Y)섬유함유대량적직경위50 nm적β-siC정립화소량적α-SiC정립,을원소존재우SiC정립지간.SiC(OY)적랍신강도위2.25 GPa,단렬인성위2.37 MPa·m1/2; SiC(Y)적랍신강도위1.61 GPa,단렬인성위1.91 MPa·m1/2; SiC(Y)섬유비SiC(OV)섬유구유경호적열은정성.
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 β-SiC crystallites with a size of 50 nm and a small amount of α-SiC crystalline.The tensile strength and fracture toughness of the SiC(OY) fibres are 2.25 GPa and 2.37 MPam1/2,respectively,and 1.61 GPa,1.91 MPa·m1/2,respectively for SiC(Y) fibres.The SiC(Y) fibres have a higher thermal stability than the SiC(OY) fibres.