Online-Joining of C/SiC-C/SiC via Precursor Infiltration and Pyrolysis Process

摘要

A novel, online-joining of C/SiC-C/SiC method, precursor infiltration and pyrolysis, was used to obtain high temperature stable joining SiC composition, while joining process was highly consistent with C/SiC preparation process. The compositions of joining ingredients and process parameters were investigated to determine the maximum joining strength of C/SiC-C/SiC at room and high temperatures. The optimum weight ratio of (polycarbosilane/divinyl benzene)/SiC powder is 3/1, and ramping rate of pyrolysis is 2℃/min, and cycles of infiltration and pyrolysis is 6. The flexural strengths of joining components remained stable up to 1200℃ (50.8MPa), but decreased to 30.5MPa at 1500℃, while the tensile strengths remained rather stable (20.5MPa) up to 1500℃, and decreased to 8.4MPa at 1800℃.