热压烧结工艺以及碳纤维含量对C/SiC复合材料性能的影响

Effect of Hot Pressing Sintering Process and Carbon Fiber Content on Properties of C/SiC Composites

以SiC粉、碳纤维为原料,采用热压烧结工艺制备了C/SiC复合材料,结合正交试验和单因素试验研究了烧结压力、烧结温度和碳纤维含量对复合材料体积密度与抗弯强度的影响。结果表明:碳纤维含量对C/SiC复合材料体积密度的影响最大,烧结温度次之,烧结压力最小;烧结温度对抗弯强度的影响最大,碳纤维含量次之,烧结压力最小;当烧结压力为25 MPa、碳纤维体积分数为30%、烧结温度为2100℃时,复合材料的综合性能最优,其体积密度为2.30 g·cm^(-3),抗弯强度为80.50 MPa。烧结工艺与碳纤维含量的变化通过影响SiC的烧结程度及碳纤维与SiC基体的界面结合强度来影响复合材料的性能。

C/SiC composites were prepared by hot pressing sintering using SiC powder and carbon fiber as raw materials.The effects of sintering pressure,sintering temperature and carbon fiber content on the bulk density and bending strength of C/SiC composites were analyzed by orthogonal experiment and single factor tests.The results show that the influence of carbon fiber content on the bulk density of composites was the greatest,followed by sintering temperature and sintering pressure,and the influence of sintering temperature on bending strength was the greatest,followed by carbon fiber content and hot pressing pressure.When the sintering pressure was 25 MPa,the carbon fiber volume fraction was 30%and the sintering temperature was 2100℃,the composites exhibited the excellent comprehensive properties with the bulk density of 2.30 g·cm^(-3)and the bending strength of 80.50 MPa.The change of sintering process and carbon fiber content affected the properties of the composites by affecting the sintering degree of SiC and the interface bonding strength of carbon fiber to SiC matrix.