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°C/min, and cycles of infiltration and pyrolysis is 6. The flexural strengths of joining
components remained stable up to 1200°C (50.8MPa), but decreased to 30.5MPa at 1500°C, while the
tensile strengths remained rather stable (20.5MPa) up to 1500°C, and decreased to 8.4MPa at 1800°C.
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