关键词: C/C复合材料, LAS玻璃陶瓷, MAS玻璃, 连接, 剪切强度

Abstract: Carbon/carbon(C/C) composites modified with SiCMoSi₂ coating are joined to Li₂CO₃Al₂O₃SiO₂(LAS) glass ceramic using MgOAl₂O₃SiO₂(MAS) glass. The effects of joining temperature, joining pressure, and holding time on the shear strength of the sample are studied. The optimal technological parameters obtained by orthogonal experiments are 1 200 ℃，20 MPa, and 15 min. Under these conditions, the shear strength of the joined sample is up to 30 MPa. The microstructure of the interfaces is analyzed by scanning electron microscope(SEM),energy disperse spectroscopy(EDS), and backscattered electron image(BEI). Results show that Si and C elements distribute in a gradient in the interface, while an interlayer about of 15 μm is produced which accelerates the joining of SiCMoSi₂ coating and C/C composite. Moreover, C/C(SiCMoSi₂)/MAS/LAS interfaces are formed due to the interdiffusion that occurrs at the interfaces between the glass and SiCMoSi₂ coating and LAS glass ceramic, which contributes to the superior joining of interfaces.

Key words: carbon/carbon composites, LAS glass ceramic, MAS glass, joining, shear strength