Preparation of Ti-Al-Si Gradient Coating Based on Silicon Concentration Gradient and Added-Ce

Coatings

Faguo Li¹  Wei He¹  Zihan Wang¹  Zhan Liu¹  Xiaoyuan Hu¹  Yao Tan¹ 

[1] School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China;

关键词: titanium alloy;    Ti-Al-Si gradient coating;    cerium;    self-generated gradient hot-dipping infiltration (SGHDI) method;    microstructure and properties;   

DOI  :  10.3390/coatings12050683

来源: DOAJ

【 摘 要 】

Titanium and titanium alloys have excellent physical properties and process properties and are widely used in the aviation industry, but their high-temperature oxidation resistance is poor, and there is a thermal barrier temperature of 600 °C, which limits their application as high-temperature components. The Self-generated Gradient Hot-dipping Infiltration (SGHDI) method is used to prepare the Ti-Al-Si gradient coating based on the silicon concentration with a compact Ti(Al,Si)₃ phase layer, which can effectively improve the high-temperature oxidation resistance of the titanium alloy. Adding cerium can effectively inhibit the generation of the τ₂: Ti(Al_xSi_1−x)₂ phase within a certain hot infiltration time so as to form a continuous dense Al₂O₃ layer to further improve the oxidation resistance of the coating. Studies have found that multiple Ti-Al binary alloy phase layers are formed during the high-temperature oxidation process, which has the effect of isolating oxygen and crack growth, and effectively improving the high-temperature resistance of the coating oxidation performance.

【 授权许可】

Unknown