Preparation of Inorganic Phosphate Ceramic Coatings on γ-TiAl Based Alloys

In this paper, we reported our investigation on preparing inorganic phosphate ceramic coatings on the surface of γ-TiAl based alloy by air spray. The high temperature performance of the coatings was tested by thermal shock test, cyclic oxidation and isothermal oxidation at 950 °C. The results showed that the coatings exhibited significant improvement on high temperature anti-oxidation performance of the base alloy. No obvious cracks or spalling of the coatings occurred after oxidation experiment under isothermal oxidation condition at 950 °C for 1000 h. The characterization was carried out to analyze the microstructure of the coatings before and after oxidation test.