QBe1.9铜合金Ti-N等离子复合渗及其摩擦磨损性能

Tribological property of Ti-N composite layer formed on QBe1.9 by plasma surface Ti-alloying and nitriding

对QBe1.9铜合金进行双辉等离子渗Ti及后续离子氮化复合处理,在其表面制备TiN(Ti_2N)/Ti合金层以改善其摩擦磨损性能。采用扫描电镜、能谱、辉光放电光谱仪、X射线衍射仪等手段观察分析Ti-N复合渗合金层的组织、成分及相结构,对合金层硬度及导电性进行了分析,并利用往复球盘摩擦磨损试验机研究QBe1.9基材及其Ti-N复合渗后的摩擦磨损性能。结果表明:经过Ti-N复合处理后,在QBe1.9铜合金表面形成厚度为27μm的复合渗层,该渗层包括表面富TiN(Ti_2N)合金层和Ti-Be-Cu扩散过渡层;QBe1.9铜合金经Ti-N复合渗后,表面硬度达964 HV,比基材的硬度明显提高;摩擦因数和比磨损率分别仅为未处理基材的30%和1.38%,达到减摩耐磨效果。表面高硬氮化物的形成是Ti-N复合渗改善QBe1.9铜合金表面性能的主要原因。

The plasma titanizing and plasma nitriding were applied in QBel.9 alloy to improve its wear resistance. The microstructure, concentration and phase structure were studied by SEM, SED, GDOES and XRD. The hardness, electrical conductivity and tribological property by reciprocating ball-on-disk test after Ti-N duplex treatment were investigated as well. The results show that, after plasma titanizing and nitriding treatments, a modified layer with thickness of 27 μm forms on QBel.9 surface, which contains surface TiN（Ti2N）-rich layer and Ti-Be-Cu diffusing layer beneath. The surface hardness after Ti-N duplex treatment reaches 964 HV, higher than that of untreated QBel.9. The average friction coefficient and wear rate of Ti-N duplex-treated QBe 1.9 alloy are only 30% and 1.38% of those of the untreated QBe 1.9 alloy, showing good combination of antifriction and wear resistance. The improved properties of QBe 1.9 alloy effectively after Ti-N complex treatment is attributed to the hard TiN（Ti2N） forming on the surface.