Ozidation behavior of SiC/Si-Mo multilayer coated C/SiC composites

摘要：

A SiC/Si-Mo multilayer coating on C/SiC composites was prepared by chemical vapor deposition (CVD) combined with slur ry painting. The oxidation behavior of the coated sample was investigated further. After 150 h oxidation at 1400℃ ,the oxidation weight loss of the coated sample is only 9.91 x 10 -4 g/cm2,which shows the coating could provide longtime protection for C/SiC composites. The oxidation weight loss with time accords with linear rule between 500-1000℃and reaches the maximum at 800℃The oxidation process at 500-800℃ is controlled by C-O reaction and the active energy is 90.2 kJ/mol. That at 800-1000℃is controlled by oxygen diffusion through cracks and the activation energy is 153.9 kJ/mol. Above 1000℃,cracks are obviously sealed and the oxidation process is complex,controlled by diffusion of oxygen through cracks,sealing of cracks and diffusion of oxygen in the formed SiO,layer.

关键词： C/SiC composites ozidation protective coating ozidation kinetics

作者: YAN Zhiqiao CHEN Feng XIONG Xiang XIAO Peng HUANG Baiyun

作者单位: Guangzhou Research Institute of Non-Ferrous Metals,Guangzhou 510650,China State Key Laboratory for P State Key Laboratory for Powder Metallurgy,Central South University,Changsha 410083,China

会议类型: 国际会议

会议名称: The 10th China-Russia System on Advanced Materials and Technologies(第十届中俄新材料新工艺研讨会)

会议地点: 浙江嘉兴

会议语种:英文

页码: 902-905

在线出版日期: 2009-10-20（万方平台首次上网日期，不代表论文的发表时间）