用Ti,Si和Cu等单质粉末为原料,用粉末冶金法制备(Ti-8Si)-xCu合金(x为质量分数,%.x= 0,5,10和20),通过硬度测试、室温干滑动摩擦试验以及对摩擦表面形貌及元素组成的观察与分析,研究Cu含量对Ti-8Si合金硬度与室温摩擦磨损性能的影响.结果表明:添加Cu元素可提高Ti-8Si合金的硬度,其中(Ti-8Si)-5Cu合金的硬度最大,HV达到1434.4,比Ti-8Si合金硬度(1021.5)提高40.4%,而(Ti-8Si)-10Cu与(Ti-8Si)-20Cu合金的表面硬度相近,HV分别为1180.9和1171.9.添加Cu使合金的摩擦因数从0.36提高至0.60左右,但添加适量的Cu能明显提高合金耐磨性能,其中95(Ti-8Si)-5Cu合金的体积磨损量(0.0143 mm3)约为Ti-8Si合金体积磨损量(0.0262 mm3)的一半;(Ti-8Si)-10Cu合金的磨损量比Ti-8Si合金降低13.7%;而(Ti-8Si)-20Cu合金的磨损量急剧增加至Ti-8Si合金磨损量的2.5倍.95(Ti-8Si)-5Cu合金的磨损形式以磨粒磨损和粘着磨损为主,伴随轻微的氧化磨损,其它3种合金主要是疲劳磨损和氧化磨损,辅以一定程度的磨粒磨损与粘着磨损.%(Ti-8Si)-xCu (x=0, 5, 10 and 20%) alloy were prepared by powder metallurgy method using Ti, Si and Cu powder as raw materials. The effects of Cu content on the hardness and friction and wear properties at room temperature of Ti-8Si alloy were studied through hardness testing, room temperature dry sliding friction test and observation and analysis of the friction surface morphology and element composition. The results show that, adding Cu powder can improve the hardness of Ti-8Si alloy. The hardness of (Ti-8Si)-5Cu alloy is the highest, HV reaches 1 434.4, which is 40.4% higher than that of Ti-8Si alloy (1021.5). The surface hardness of (Ti-8Si)-10Cu is almost equal to that of (Ti-8Si)-20Cu alloy, and HV is 1180.9 and 1171.9 respectively. The friction coefficient of the alloy increases from 0.36 to 0.6 by adding Cu. However, adding the appropriate amount of Cu can obviously improve the wear resistance of the alloy, and the volume wear volume (0.014 3 mm3) of 95 (Ti-8Si)-5Cu alloy is about half of the Ti-8Si alloy (0.026 2 mm3). The wear volume of (Ti-8Si)-10Cu alloy is reduced by 13.7% than Ti-8Si alloy. The wear volume of the (Ti-8Si)-20Cu alloy increases sharply to 2.5 times that of the Ti-8Si alloy. The wear forms of 95 (Ti-8Si)-5Cu alloy are mainly abrasive wear and adhesive wear, accompanied by slight oxidation wear. The other 3 alloys are mainly fatigue wear and oxidation wear, with a certain degree of abrasive wear and adhesive wear.
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