学术论文

      激光熔覆 WC/Ni60B复合涂层在水润滑滑动摩擦环境下的磨损特性

      Wear behavior of laser cladding WC/Ni60 B composite coatings under water lubrication sliding condition

      摘要:
      采用激光熔覆技术制备了Ni60B镍基合金涂层以及微米WC、纳米WC和微-纳米WC颗粒增强的Ni60B基复合涂层(分别称为WCm、WCn和WCmn复合涂层)。对制备涂层在Amsler200磨损试验机上进行了不同载荷和滑动距离的水润滑滑动磨损试验。结果表明:WC颗粒的加入显著提高了Ni60B涂层的耐磨性。 WCm复合涂层和纳米WCn复合涂层的耐磨性差别不大,但磨损形貌不同。涂层在水润滑环境下的磨损量均远远低于干滑动摩擦,其原因是水膜的支撑或隔离作用降低了涂层与磨轮之间的接触应力,水的冷却作用减少了摩擦热引起的温度升高,降低了涂层摩擦表面的温升和热软化。水润滑摩损条件下,WCm和WCn复合涂层中过饱和W元素发生扩散和聚集。
      Abstract:
      Ni60B nickel based alloy coatings and micro WC, nano WC and micro-nano WC particle reinforced Ni60B composite coatings were fabricated using laser cladding technology, hereinafter called as WCm, WCn and WCmn coatings,respectively. Sliding wear tests at different loads and sliding distances were conducted for the coatings using an Amsler200 tester under water lubrication con-ditions. The results show that the addition of WC particles can improve the wear resistance of Ni60B coatings and that the wear resist-ance of the WCm and WCn coatings does not presentan obvious difference, however their worn morphologiesare different. The wear re-sistance of the coatings is much better under water lubrication than dry sliding wear because the water lubrication film can play a sup-port or isolating action between the coatings and the wear wheel, which decreases their contact stress, and because water cooling to fric-tion couples decreases the temperature rising and the softening of the coatings. W element which is saturated in the WCn and WCm-coatings diffuses and agglomeratesduring water lubrication wear.
      作者: 陈华辉 [1] 闫卓 [1] 徐采云 [1] 赵会友 [1] 王振廷 [2]
      Author: CHEN Hua-hui [1] YAN Zhuo [1] XU Cai-yun [1] ZHAO Hui-you [1] WANG Zhen-ting [2]
      作者单位: 中国矿业大学 北京 机电与信息工程学院材料科学与工程系,北京,100083 黑龙江科技大学材料科学与工程学院,哈尔滨,150022
      刊 名: 北京科技大学学报 ISTICEIPKU
      年,卷(期): 2014, (4)
      分类号: TG174.445
      机标分类号: TG1 TN2
      在线出版日期: 2014年5月15日
      基金项目: 国家自然科学基金资助项目,中国国家自然科学基金与英国皇家学会合作基金资助项目