硅树脂浓度对PIP制备3D C_f/Si-O-C材料性能的影响  

Study on 3D C_f/Si-O-C Composites Fabricated via Polysiloxane Pyrolysis

作　　者：刘静宇[1] 陈朝辉[2] 简科[2] 方志薇[1] 彭霞辉[1] 

机构地区：[1]长沙学院,湖南长沙410003 [2]国防科技大学新型陶瓷纤维及其复合材料国防科技重点实验室,湖南长沙410073

出　　处：《稀有金属材料与工程》2009年第A02期440-442,共3页Rare Metal Materials and Engineering

基　　金：长沙学院科研基金项目(CDJJ-07010206)

摘　　要：以三维碳纤维织物和廉价的硅树脂为原料,采用先驱体转化工艺制备3DCf/Si-O-C材料,考察了硅树脂浓度对材料微观结构与力学性能的影响。结果表明:随着硅树脂浓度的增加,3DCf/Si-O-C材料的密度增加,孔隙率下降,材料的弯曲强度增加,当硅树脂浓度达到54.5%时,材料的弯曲强度达到360.6MPa;而随着硅树脂浓度的进一步增加,材料的密度虽然进一步增加,但弯曲强度和断裂韧性却明显下降,这主要是由于硅树脂浓度过高时,所制备的材料基体与纤维结合较紧,界面结合较差的原因造成的。Three Dimensional carbon fiber cloth reinforced silicon oxycarbide （3D Cf/Si-O-C） composites were fabricated with low cost silicon resin as precursors and 3D Cf as reinforcement. The effects of silicon resin content on the structure and properties of 3D Cf/Si-O-C composites were investigated. The results showed that with the increase of silicon resin content, the porosity of composites decreased and the flexural strength increased. It was found that fabricated with 54.5 wt% silicon resin, the composites exhibited optimum properties, and the flexural strength of the composites reached 360.6 MPa. With the further increase of the silicon resin content, the density of the composites increased, but the interface bonding was too dense and the flexural strength and fracture toughness of the composites decreased because of weakened the interface bonding.

关 键 词：先驱体转化法 硅树脂 3DCf/Si—O-C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]