Surface plasma chromized burn-resistant titanium alloy

Conventional titanium alloy may be ignited and burnt under high temperature, high pressure and high gas flow velocity conditions. In order to avoid this problem, a new kind of burn-resistant titanium alloy—double glow plasma surface alloying burn-resistant titanium alloy has been developed. Alloying element Cr is induced into the Ti-6.5Al-0.3Mo-1.5Zr-0.25Si substrate according to double glow discharge phenomenon, Ti–Cr burn-resistant alloy layer is formed on the surface of Ti–6.5Al–0.3Mo–1.5Zr–0.25Si alloy. The depth of the surface burn-resistant alloy layer can reach to above 200 μm and alloying element concentration can reach 90%. Burn-resistant property experiments reveal that if Cr concentration is above 14% in the alloying layer, ignition and burn of titanium alloy can be effectively avoided.