Abstract Thermal-gradient chemical vapor infiltration (TCVI) is a novel and effective process for fabricating C/C composites. However, the changing of the temperature field during infiltration is rather complex, which is difficult to obtain the results by the resolution method. In this paper, the finite element model concerning unstable temperature field for TCVI process was set up, and, temperature field and temperature distribution during the whole infiltration process were given out by numerical simulation. The relationship between deposition temperature and infiltration efficiency was also investigated. The experimental results of the temperature distribution were accordant to the simulation results.
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