TC4钛合金低压真空氮化改性层的制备与性能  

Preparation and Property of Low Pressure Vacuum Nitriding Modified Layer on TC4 Titanium Alloy

作　　者：杨闯[1,2] 彭晓东[1] 刘静[2] 马亚芹[2] 王华[2] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400044 [2]贵州师范大学材料与建筑工程学院,贵阳550025

出　　处：《材料工程》2015年第3期78-82,共5页Journal of Materials Engineering

基　　金：贵州省科学技术基金项目(J20132220)

摘　　要：采用低压真空渗氮的方法,在TC4钛合金表面制备了与基体结合良好的改性层。通过金相观察、X射线衍射（XRD）和扫描电镜（SEM）分析了表面改性层的组织结构,并对改性层的显微硬度及耐磨性进了测试。结果表明：TC4钛合金经低压真空渗氮处理后,表面可获得由TiN和Ti2AlN组成的氮化物改性层,组织均匀致密,氮化物颗粒细小,硬化层与基体结合良好,表面硬度为1100~1200HV,心部硬度为300~320HV,硬化层深度可达60~70μm,硬度梯度平缓,耐磨性优良。A modified layer with good bonding strength with substrate was prepared on the surface of TC4 titanium alloy by low pressure vacuum nitriding treatment. The microstructure of surface modi- fied layer was analyzed by optical microscopy, X-ray diffractometry （XRD）, scanning electron micros- copy （SEM）, the microhardness and wear resistance of the modified layer was measured. The results show that a surface nitrides modified layer composed of TiN and Ti2 AIN can be obtained by low pres- sure vacuum nitriding treatment, the microstructure is uniform and compact, with fine nitride parti- cles, the hardened layer has a good bonding strength with its substrate, the surface hardness is 1100- 1200 HV, and the hardness in the core is 300-320 HV,the depth of the hardened layer can reach 60- 70μm, the hardness gradient of nitrided layer is smooth, and it has superior wear resistance.

关 键 词：TC4钛合金 低压真空渗氮 组织 性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]