Plasma surface alloying of titanium alloy for enhancing burn-resistant property
(1.江苏省南京市南京航空航天大学材料科学与技术学院
2..School of Material Science and Technology,Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
3.Institute of Surface Engineering, Taiyuan University of Technology, Taiyuan 030024,China)
2..School of Material Science and Technology,Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
3.Institute of Surface Engineering, Taiyuan University of Technology, Taiyuan 030024,China)
Abstract: Conventional titanium alloy may be ignited and burnt under high temperature, high pressure and high gas flow velocity condition. In order to avoid this problem, burn-resistant alloying layers were made on the surface of Ti-6Al-4V and Ti-6.5Al-0.3Mo-1.5Zr-0.25Si titanium alloys by using double glow plasma surface alloying technology (DG Technology). Two typical burn-resistant layers Ti-Cr and Ti-Mo were made by DG plasma chromizing and DG plasma molybdenizing, respectively. Burn-resistant properties were tested by layer ignition method using 2 kW laser machine. Ignition experiments result reveals that the ignition temperature of alloyed layer with Mo and Cr concentration above 10% is about 200℃ higher than ignition temperature of Ti-6Al-4V substrate.
Key words: double glow plasma surface alloying; burn-resistant titanium alloy; plasma molybdenizing; plasma chromizing