脉冲CLVD+PIP联用工艺制备C/SiC复合材料  

Preparation of C/SiC composites by pulse CLVD+PIP process

作　　者：何新波[1] 梅敏[1] 曲选辉[1] 胡海峰[2] 张玉娣[2] 陈思安[2] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]国防科学技术大学,长沙410073

出　　处：《粉末冶金技术》2013年第3期212-215,222,共5页Powder Metallurgy Technology

摘　　要：以液态聚碳硅烷(LPCS)为先驱体,采用脉冲化学液气相沉积(脉冲CLVD)与先驱体浸渍裂解(PIP)联用工艺制备了C/SiC复合材料。采用排煤油法测定了材料的密度,三点弯曲法测试材料的力学性能,采用扫描电子显微镜观察弯曲试样的断口形貌。结果表明:密度为1.76 g.cm-3的沉积试样在经过5轮PIP工艺处理后,材料的密度达到1.98 g.cm-3,抗弯强度达到321.9 MPa,和PIP工艺完全致密化的复合材料的密度及性能相当,但制备周期缩短到10天。材料中的PIP-SiC基体除了能填充纤维束间及层间的大孔隙,还能进一步填充纤维束内由于纤维束丝分布不均匀而在脉冲CLVD工艺过程中残留的大孔隙。C/SiC composites were prepared by pulse chemical liquid-vapor deposition （pulse CLVD） and precursor infiltration pyrolysis （PIP） process, using liquid polycarbosilane as precursor. The density and the mechanical properties of the composites were measured by Archimedes＇ method with kerosene as medium and three-point bending test, respectively. The morphologies of fracture surface were investigated by scanning electron microscopy. The results show that after five PIP cycles for the sample prepared by pulse CLVD with a density of 1.76 g · cm^-3, the density and flexural strength of C/SiC composite are 1.98 g · cm^-3 and 321.9 MPa, respectively, equivalent to the fully densified composites prepared by PIP process. The large pores between bundles and layers can be well densified by PIP-SiC matrix, the residual pores exist in fiber bundle can be also filled during CLVD process.

关 键 词：脉冲化学液气相沉积 先驱体浸渍裂解 C SIC复合材料 力学性能 微观结构 

分 类 号：TB332[一般工业技术—材料科学与工程]