CAJ | 학술논문

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。
채용격광용복기술제비료Ni60B얼기합금도층이급미미WC、납미WC화미-납미WC과립증강적Ni60B기복합도층(분별칭위WCm、WCn화WCmn복합도층)。대제비도층재Amsler200마손시험궤상진행료불동재하화활동거리적수윤활활동마손시험。결과표명：WC과립적가입현저제고료Ni60B도층적내마성。 WCm복합도층화납미WCn복합도층적내마성차별불대,단마손형모불동。도층재수윤활배경하적마손량균원원저우간활동마찰,기원인시수막적지탱혹격리작용강저료도층여마륜지간적접촉응력,수적냉각작용감소료마찰열인기적온도승고,강저료도층마찰표면적온승화열연화。수윤활마손조건하,WCm화WCn복합도층중과포화W원소발생확산화취집。
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.