Preparation of Ti2 AlC MAX Phase Protective Coating on YSZ Thermal Barrier Coatings by Slurry Method

Ti2AlC MAX phase is a potential material protecting thermal barrier coatings (TBCs) against environmental deposition (CMAS) corrosion. Ti2AlC protective layer was prepared on the surface of YSZ (Y2O3 partially stabilized ZrO2) TBCs by a slurry method, and effects of the binder type, binder content, covering method, sintering temperature and time on the coating quality are investigated. The results show that compared with sodium silicate, ethyl cellulose is more suitable as the binder. When the binder content was about 7%, the surface of Ti2AlC coating is entire without obvious defects. Compared with the brush covering method, the coating prepared by dipping had better compactness and no obvious gap at the interface. The optimum sintering temperature and time are 1250 degrees C and 10 h, respectively. Finally, a Ti2AlC protective coating with a thickness of similar to 100 mu m is successfully prepared on the surface of YSZ TBCs by the optimized parameters, the interface between which and the YSZ coating is entire and well combined. This study is considered to provide a guidance for using TOW MAX phase protective coating for TBC applications.