Abstract
High-temperature oxidation and corrosion resistance of Ti-4Si/5TiO2, Ti-4Si-1.3Zr/5TiO2, Ti-4Si-0.3Y2O3/5TiO2, and Ti-4Si-1.3Zr-0.3Y2O3/5TiO2 composites prepared by high-energy milling and cold pressed sintering were investigated. Ti-4Si-1.3Zr-0.3Y2O3/5TiO2 composite recorded the lowest average oxidation rate (k+) for temperatures at 900 °C, and 1100 °C showing best oxidation performance at high temperatures. In a molten mixture of the salt of sodium sulfate and sodium chloride medium at 750 °C for 30 h, the corrosion weight gain per unit area of Ti-4Si-1.3Zr-0.3Y2O3/5TiO2 composites (0.6856 mg cm−2) was again the lowest indicating best corrosion resistance. Ti-4Si-1.3Zr/5TiO2 composites recorded the maximum weight gain per unit area, indicating its poorest corrosion resistance. The addition of Zr and Y2O3 to titanium-silicon composites thus can improve the high-temperature oxidation and corrosion resistance. This research provides a benchmark for further studies into Ti-4Si-1.3Zr-0.3Y2O3/5TiO2 as a candidate material for use in aircraft engines.
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