以先驱体浸渍裂解(PIP)工艺制备的C/SiC复合材料为研究对象,考察了聚碳硅烷/二甲苯(PCS/Xylene)和聚碳硅烷/二甲苯/碳化硅粉(PCS/Xylene/SiC)两种浆料对C/SiC材料耐高温性能的影响.研究发现:在1600 ℃惰性气氛保护下高温处理1 h后,PCS/xylene/SiC制备的材料失重较大,达4.67%.弯曲强度在高温处理前后的保留率较高,高温处理后其强度达464.1 MPa,但模量下降明显.高温处理使C/SiC材料的增韧机制发生改变,PCS/Xylene中添加SiC改变了材料的界面结构.结果表明:两种不同的浸渍浆料对C/SiC材料的耐高温性能有着较明显的影响.
C/SiC composites were fabricated by Precursor Infiltration and Pyrolysis(PIP) with different slurries. The effects of high temperature treatment on the composites were studied in the paper. After heat treatment at 1600 ℃ for 1h in flowing argon, the two kinds of composites fabricated with PCS/Xylene/SiC lost more mass which came to 4.67%. Its flexural strength was 464.1 MPa after high temperature treatment, but its flexural modulus reduced obviously. The reinforcement mechanism changed after treatment. And the SiC powder added to PCS/Xylene changed the structure of the interface. The results indicate that the effects of different slurries on the high temperature performance of C/SiC composites via PIP are obvious.
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