首周期先驱体溶液浓度对PIP法制备3D-C_f/Si-O-C的影响  

Effect of the First Cycle of Precursor Solution Infiltration on the Properties of 3D-C_f/Si-O-C via PIP

作　　者：徐天恒[1] 陈朝辉[1] 马青松[1] 

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

出　　处：《稀有金属材料与工程》2008年第A01期600-603,共4页Rare Metal Materials and Engineering

基　　金：国防预先研究计划

摘　　要：以三维碳纤维编织物和硅树脂(SR249)为原料,采用先驱体转化法(PIP)制备了3D-C_f/Si-O-C材料,考察了首周期先驱体溶液浓度对其力学性能的影响。结果表明:首周期浸渍先驱体溶液的浓度不同会导致3D-C_f/Si-O-C复合材料中气孔大小及分布的不同而对力学性能产生较大影响,随首周期先驱体溶液浓度的增大,3D-C_f/Si-O-C复合材料力学性能先降低后提高。首周期采用SR249/xylene体积比为0.5∶1先驱体溶液制备的3D-C_f/Si-O-C复合材料力学性能和气孔率都处于极小值,其弯曲强度为247 MPa,断裂韧性为9.6 MPa·m^(1/2),气孔率为10.8%。Three dimensional carbon fiber reinforced silicon oxycarbide composites （3D-Cf/Si-O-C） were fabricated via precursor infiltration and pyrolysis （PIP） using polysiloxane （SR249） as the precursor and three dimensional carbon fiber as the reinforcements. The concentration of the precursor solution influenced the pore size and its distribution that led different mechanical properties of 3D-Cf/Si-O-C. The increasing concentration of the precursor solution reduced and then increased the mechanical properties of 3D-Cf /Si-O-C. The first cycle infiltration at SR249：xylene=0.5：1 led to poor mechanical properties of 3D-Cf/Si-O-C. The flexural strength and fracture toughness were 247 MPa and 9.6 MPa·m^1/2, respectively and the porosity reduced to 10.8%.

关 键 词：硅树脂 先驱体转化 先驱体溶液浓度 陶瓷基复合材料 

分 类 号：TB332[一般工业技术—材料科学与工程]