Study on Degradation Phenomenon of SiC in Combustion Gas Flow Environment at High-Temperature and Speed. Study of Influence Factor on Degradation.

Abstract

Effects of various basic factors of combustion gas flow conditions on SiC degradation phenomenon have been experimentally clarified. SiC degradation phenomenon was signified as the weight loss, the weight loss became larger with increase of the partial pressure of water vapor in combustion gas, and its rate was also greatly dependent on the partial pressure of water vapor. The effect of the partial pressure of oxygen on the weight loss was small, and the weight loss decreased with increase of the partial pressure of oxygen. By considering the effect of partial pressures of water vapor and oxygen, the gas temperature, the pressure and the gas flow rate in combustion gas conditions did not have such a significant effect on the weight loss in the extent of test conditions. Based on experimental results, it was clarified that the partial pressure of water vapor is a major factor on SiC degradation.