(哈爾濱工業(yè)大學(xué) 空間材料與環(huán)境工程實(shí)驗(yàn)室，
哈爾濱 150001)
摘 要: 利用熱氧化后真空擴(kuò)散處理工藝在Ti-6Al-4V合金表面制備了與基體結(jié)合良好的硬化層，并在空氣和真空條件下分別進(jìn)行了摩擦磨損試驗(yàn)。 結(jié)果表明， 硬化層由表面氧化物薄層和氧擴(kuò)散區(qū)組成， 硬化深度可達(dá)60μm。 經(jīng)840℃真空擴(kuò)散后， 在表面硬化層中發(fā)現(xiàn)有Ti3Al相形成， 使沿層深方向的硬度下降趨勢(shì)變緩。 熱氧化/真空擴(kuò)散處理可有效地降低在空氣和真空中的Ti-6Al-4V合金與GCr15鋼的干摩擦因數(shù)， 提高Ti-6Al-4V合金在空氣和真空中的的磨損抗力。
關(guān)鍵字: 鈦合金； 氧化； 擴(kuò)散； 摩擦； 磨損
（Space Materials and Environment Engineering Lab,
Harbin Institute of Technology, Harbin 150001, China）
Abstract:A hardened layer possessing good bonding strength with substrate was prepared on the surface of Ti-6Al-4V alloy by a process of thermal oxidation followed by vacuum diffusion. The friction and wear tests were carried out under the air and vacuum conditions. The results show that the hardened layer, which thickness can reach 60μm, comprises a thin surface oxide layer and an oxygen diffusion zone. After vacuum diffusion at 840℃, it is found that the decrease rate of the hardness is slower with increasing the depth within the diffusion layer， resulting from the formation of the Ti3Al phase. The coefficient of the dry friction of the thermal oxidation/vacuum diffusion treated Ti-6Al-4V alloy against GCr15 steel is efficiently reduced. The wear resistance of the treated Ti-6Al-4V alloy is significantly increased.
Key words: titanium alloy； oxidation； diffusion； friction； wear
