Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第13卷    第1期    总第52期    2003年2月

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文章编号:1004-0609(2003)01-0177-04
Ti-6A-4V合金表面的热氧化/真空扩散处理
刘 勇, 杨德庄, 何世禹, 武万良

(哈尔滨工业大学 空间材料与环境工程实验室,
哈尔滨 150001
)

摘 要: 利用热氧化后真空扩散处理工艺在Ti-6Al-4V合金表面制备了与基体结合良好的硬化层,并在空气和真空条件下分别进行了摩擦磨损试验。 结果表明, 硬化层由表面氧化物薄层和氧扩散区组成, 硬化深度可达60μm。 经840℃真空扩散后, 在表面硬化层中发现有Ti3Al相形成, 使沿层深方向的硬度下降趋势变缓。 热氧化/真空扩散处理可有效地降低在空气和真空中的Ti-6Al-4V合金与GCr15钢的干摩擦因数, 提高Ti-6Al-4V合金在空气和真空中的的磨损抗力。

 

关键字: 钛合金; 氧化; 扩散; 摩擦; 磨损

Thermal oxidation/vacuum diffusion treatment on surface of titanium alloy
LIU Yong, YANG De-zhuang, HE Shi-yu,WU Wang-liang

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

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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