Abstract
A SiO2–Al2O3 glass composite coating was prepared on Ti60 alloy via air spraying slurry and then a suitable baking process. It was composed of potassium silicate glass, alumina and quartz powders. The high temperature oxidation performance of the alloy with and without coating was evaluated in static air at both 800 °C and 900 °C. The results show that catastrophic oxidation occurs for Ti60 bare alloy. It had a mass gain of about 2 mg/cm2 after oxidation at 800 °C and 17 mg/cm2 at 900 °C for 100 h. On the contrary, the oxidation resistance of alloy coated with composite coating was much improved with the mass gain about 0.36 mg/cm2 and 0.95 mg/cm2 at 800 °C and at 900 °C, respectively. The microstructure evolution of the composite coating and the alloy was analyzed by scanning electron microscope and electron probe microanalyzer. The effect of the composite coating on the oxidation performance of the alloy is discussed especially in terms of oxygen diffusion and interfacial reaction.
Highlights
Titanium alloys are attractive structural materials for their high specific strength, excellent corrosion resistance and stable moderate temperature properties [1]
A novel SiO2–Al2O3 glass composite coating was successfully prepared on Ti60 alloy
The oxidation performance of the coating was evaluated at 800 °C and 900 °C
Summary
Titanium alloys are attractive structural materials for their high specific strength, excellent corrosion resistance and stable moderate temperature properties [1] They have been widely used in areas of aerospace, automotive, military, sports equipment and chemical engineering [1,2,3,4,5,6]. In order to get good thermal and mechanical properties, the types of crystals in the glass should be well controlled, that is, to avoid the precipitation of the coarse acicular-shaped crystals [8] This requires designing the glass composition and heat treatment elaborately. The small colloids particles in the solution of binary alkali silicates aggregate and form the glass matrix during the baking process In this way, the microstructure of the glass-ceramic coatings is uniform. The effect of the composite coating on the oxygen diffusion during high temperature exposure is discussed for the first time
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