原位生长SiC晶须对C/C-SiC复合材料摩擦磨损性能影响

The Influence of In-situ SiC whiskers on the Friction and Wear Properties of C/C-SiC Composites Material

采用聚合物浸渍热解(PIP)技术向C/C-SiC复合材料纤维束内引入了SiC晶须(SiC_(W)),然后结合化学气相渗透(CVI)和液硅渗透(LSI)法制备了C/SiCW-C-SiC复合材料,系统研究了原位生长SiCW的物相组成及典型微结构特征,在不同制动初速度下测试了C/SiC_(W)-C-SiC复合材料的摩擦磨损性能,结果表明:引入SiC_(W)后,对平均摩擦系数和瞬时摩擦系数影响较小,摩擦性能未发生明显变化,中高速制动时,C/SiC_(W)-C-SiC的磨损率相比于C/C-SiC可降低20%~60%。

SiC whisker(SiC_(W))was introduced into the fiber bundle of C/C-SiC composites by polymer impregnation pyrolysis(PIP)technology,and then C/SiC_(W)-C-SiC composites were prepared by chemical vapor infiltration(CVI)and liquid silicon infiltration(LSI)methods.The phase composition and typical micro-structure characteristics of in-situ grown SiC_(W)were systematically studied.The friction and wear properties of C/SiC_(W)-C-SiC composites were tested at different braking speeds.The results show that the introduction of SiCW has little effect on the average friction coefficient and instantaneous friction coefficient,and the friction performance does not change significantly.Compared with C/C-SiC,the wear rate of C/SiC_(W)-C-SiC can be reduced by 20%-60%at medium and high speed braking.