The Effects of Additive on Thermal Shock Life of Cr_2O_3 Coating and the Choice of Coating

WT5BZ]The influence of additive CeO 2 and SiO 2 with different content on the thermal shock failure life of Cr 2O 3 coating was studied It is shown that the thermal shock failure mechanism of coating is thermal stress fatigue destruction through thermal shock text The critical temperature range △T C can be greatly enhanced by adding CeO 2 and SiO 2 to Cr 2O 3 layer through reanalysis the results of thermal shock experiment date The addition of proper amount of CeO 2 to Cr 2O 3 layer obviously increase the coefficient of coating's resistance to thermal shock , but proper amount of SiO 2 to Cr 2O 3 layer greatly increase △T C The choosing additive is based on the serve condition of coating When coating works at temperature being lower 300℃,the adding 3 0% CeO 2 to Ce 2O 3 layer is chosen because which has the best complex property But, when coating works between 300℃ and 500℃, the SiO 2 is chosen as additive to Cr 2O 3 layer, which has longer thermal shock lifetime