KD-S型SiC纤维表面BN界面层Raman光谱研究

Raman Spectra of the BN Coatings on KD-S SiC Fibers

由于SiC纤维具有高强度、高模量、强抗化学腐蚀性等优越性能,因此广泛用于陶瓷基复合材料的增强当中。但在高温下制备复合材料,容易使纤维与基体之间形成牢固的附着力,导致复合材料力学性能差,因此需要界面层使纤维与基体间的结合足够弱。BN具有良好的耐热性、抗氧化性和微裂纹自愈合能力,可用于解决SiC纤维增强SiC基复合材料的界面问题。CVD法是常用的制备BN界面层的工艺方法。本文以BCl3-NH_3为原料,在较低温度下通过CVD工艺制备了BN界面层。

SiC fibersare were widely used as reinforce mentinceramics matrix composites due to their high strength,high modulus and high chemical resistance,etc.However,under high temperature preparation,these fibers easily form a strong adhesion with ceramic matrix,resulting in a composite with poor mechanical properties.Therefore,an interphase is required to make the fiber–matrix bonding weak enough.BN has high temperature stability,high oxidation resistance and self-healing ability of microcracks and can be used to solve the interface problems in SiC fiber reinforced SiC matrix composites.Most of the BN coatings were prepared by CVD.In this paper,the BN coatings was prepared using BCl3-NH3 as raw materials at a lower temperature by CVD.