磨损条件对等离子熔覆TiB_2-TiC/Ni复合涂层磨损性能的影响  

Effects of Wear Conditions on Tribological Properties of TiB_2-TiC/Ni Composite Coating by Plasma Cladding

作　　者：张新杰[1] 崔洪芝[1] 毕文彪 张国松[1] 王明亮 王佳峰[1] ZHANG Xin-jie;CUI Hong-zhi;BI Wen-biao;ZHANG Guo-song;WANG Ming-liang;WANG Jia-feng(College of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, Shandon)

机构地区：[1]山东科技大学材料科学与工程学院,山东青岛266590

出　　处：《中国表面工程》2018年第2期148-158,共11页China Surface Engineering

基　　金：国家高技术研究发展计划(863计划)(2015AA034404);国家自然科学基金(51772176);泰山学者攀登计划(tspd20161006)~~

摘　　要：利用等离子熔覆技术以Q235低碳钢为基体制备了TiB_2-TiC强化Ni基复合材料涂层,涂层中的主要物相为TiB_2、TiC和γ-Ni,硬度达1 050 HV0.5,涂层与基体呈冶金结合状态。分别采用Al2O3陶瓷球和不锈钢球为对摩副,在30、60和120 N磨损载荷下进行往复干滑动摩擦磨损试验。结果表明:Al2O3陶瓷球为对摩副时,低载荷下(30 N)表现为微切削磨损形式;60 N载荷时,出现压实层的结构,降低了摩擦因数,磨损机理转变为粘着磨损的形式;当载荷增加到120 N时,磨损机理为氧化磨损和剥层磨损。而采用不锈钢磨球时,涂层硬度大于对摩不锈钢球硬度,磨球发生剪切破坏,部分转移到涂层表面,相对于Al2O3陶瓷磨副时具有更大的粘着效应,且随着载荷的增大转移量增加,粘着磨损加剧,所以摩擦因数呈现出随着载荷加大一直上升的趋势。TiB2-TiC reinforced Ni-based composite coating was prepared on Q235 low carbon steel substrate by plasma cladding. The main phases of the coating were TiB2, TiC, and γ-Ni and the hardness was about 1 050 HV0.5. A metallurgical bond was obtained between the coating and the substrate. Reciprocating dry sliding friction and wear tests were performed at loads of 30 N, 60 N, and 120 N with Al2 O3 ceramic balls and stainless-steel balls as counter grinding pairs, respectively.Results show that the wear mode is micro-cutting when the Al2 O3 ceramic balls are the counter grinding pairs. The structure of the compaction layer appears at a load of 60 N in which reduces the friction coefficient, and the wear mechanism is transformed into adhesive wear. With increasing load to 120 N, the wear mechanisms are oxidation wear and peeling wear.When the stainless-steel grinding balls are used, shear damage occurs in the grinding balls, and the stainless-steel material is partially transferred to the surface of the coating due to the higher hardness of coating than that of the counter grinding stainless-steel balls. The stainless-steel balls exhibited a greater adhesive effect than the Al2 O3 ceramic grinding pairs.Additionally, the amount of transfer increases and the adhesive wear is aggravated. As a result, the friction coefficient shows a rise tendency as the load increases, when stainless-steel balls are used as the counter grinding pairs.

关 键 词：等离子熔覆 复合涂层 TiB2-TiC 微观组织 摩擦学性能 

分 类 号：TG174.4[金属学及工艺—金属表面处理] TG115.58[金属学及工艺—金属学]