先驱体转化制备2D C_f/SiC复合材料力学性能  

Mechanical Properties of 2D C_f/SiC Composites Fabricated by Precursor Pyrolysis

作　　者：简科[1] 刘静宇[2] 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国防科技重点实验室,湖南长沙410073 [2]长沙学院生物工程与环境科学系,湖南长沙410003

出　　处：《稀有金属材料与工程》2008年第A01期224-227,共4页Rare Metal Materials and Engineering

基　　金：国防预研基金(51488030105ZS9504)

摘　　要：以国产3k JC1#纤维布为增强体,以聚碳硅烷和SiC微粉为先驱体和填料,分别采用热压辅助先驱体转化和先驱体浸渍裂解工艺制备了2D C_f/SiC复合材料。结果表明,热压辅助先驱体转化工艺制备的2D C_f/SiC复合材料纤维损伤严重,基体较为疏松,材料力学性能很低,弯曲强度和断裂韧性仅为84.3 MPa和6.5 MPa·m^(1/2)。而先驱体浸渍裂解工艺制备的2D C_f/SiC复合材料纤维损伤较小,具有较好的界面结合,内部孔隙较为均匀,力学性能较好,弯曲强度和断裂韧性分别达到321.6 MPa和17.8 MPa·m^(1/2)。材料具有较好的高温力学性能,1300℃时力学性能有较大幅度的提高,1600℃和1800℃时复合材料力学性能还可以较好地保持。Two-dimensional carbon fiber cloth reinforced silicon carbide （2D Cf/SiC） composites were fabricated by hot-pressed assisted precursor pyrolysis and precursor infiltration and pyrolysis respectively, with 3k JC 1 # carbon fiber cloth as reinforcement, polycarbosilane （PCS） as precursors and SiC particles as inert fillers. The fibers in the composites fabricated by hot-pressed assisted process were damaged seriously with many pores in the matrix, and the flexural strength and fracture toughness of the composites were only 84.3MPa and 6.5MPa·m^1/2, respectively. The composites fabricated by precursor infiltration and pyrolysis exhibited much better interface bonding and little fiber damage, and the mechanical properties of the composites increased, with the flexural strength and fracture toughness reaching 321.6 MPa and 17.8 MPa·m^1/2, respectively.

关 键 词：2D CF/SIC复合材料 先驱体转化 力学性能 纤维损伤 界面结合 

分 类 号：TB333[一般工业技术—材料科学与工程]