以新型先驱体浸渍裂解制备SiC/SiC复合材料弯曲性能研究  

Fabrication of SiC/SiC Composites by Improved PIP Processing with a New Precursor Polymers

作　　者：罗征[1] 周新贵[1] 余金山[1] 王飞[1] 

机构地区：[1]国防科学技术大学 CFC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》2013年第S1期377-379,共3页Rare Metal Materials and Engineering

基　　金：国防预研项目(513120409)

摘　　要：以一种新型先驱体LPVCS为原料、KD-1型SiC纤维作为增强相,采用先驱体浸渍裂解工艺(PIP)制备了SiC/SiC复合材料,并对其性能及微观形貌进行表征。实验结果表明,以LPVCS为先驱体、经过热模压辅助成型工艺处理的材料密度为2.11g/cm3,孔隙率为6.25%,而且材料制备周期大大缩短。采用CVD工艺在SiC纤维表面制备裂解碳涂层可有效降低裂解过程中高温对纤维造成的损伤,而且可改善纤维与基体界面的结合,使材料抗弯强度达619.4MPa,断裂韧性达29.1MPa·m1/2,较无涂层的纤维增强复合材料更高。Silicon carbide (SiC) matrix composites reinforced with KD-I SiC fibers (SiC/SiC) were fabricated by precursor impregnation and pyrolysis (PIP) process with a new precursor, LPVCS. The microstructure and properties of the as prepared SiC/SiC composites were studied. The results show that the density and the open porosity of the composites are 2.11g/cm-3 and 6.25%, respectively. The composites processed by pressure-assisted process and LPVCS are fabricated with shorter manufacturing cycles. The fiber-matrix interfaces are tailored by pre-coating the as-received KD-I SiC fibers with PyC layers. The SiC fibers are not severely damaged during the PIP process, and the SiC fibers adher to the matrix with a weak interface. Therefore, the composites exhibit excellent mechanical properties with the flexural strength of 619.4 MPa and fracture toughness of 29.1 MPa·m 1/2 , which are higher than that of the composites reinforced using as-received SiC fibers without PyC layers.

关 键 词：先驱体浸渍裂解 SIC/SIC复合材料 裂解碳涂层 弯曲性能 

分 类 号：TB332[一般工业技术—材料科学与工程]