ZHANG He, LIU Yanbo, MA Zhuang, LUAN Xingtao
(Laboratory of Science and Technology on Materials under Shock and Impact, Beijing Institute of Technology,
Beijing 100081, China)
Abstract: To solve the low deposition rate,high porosity ,C/C was ablated during ablation process problem of SiC coating deposited by APS.SiC/Al2O3 composite ceramic reunion powder was designed and prepared,and composite ceramic coating was deposited by APS.The coating was tested by oxyacetylene flame at 1500 ℃.Microstructure and composition of the reunion powder and coating were detected by XRD, SEM.The results show that the addition of Al2O3in SiC increases the deposition rate and the density of the SiC coating.And it’s because of Al2O3 has good high temperature filling effect in the APS process.Al2O3 can ease the stress, reduce coating cracking during cooling process due to thermal expansion coefficient does not match.Ablation experiment shows that the coating is integrity after ablated at 1500 ℃ for 5 minutes,proves that the addition of oxides can block holes and inhibit the diffusion of oxygen, thus improve the anti-ablation properties of SiC coating.
Key words: APS; C/C composite; ablation resistance coating;SiC/Al2O3 composite ceramic coating