引用本文:胡泽祥， 刘杰瑞， 郭纯， 周健松， 张世堂.激光熔覆NiCoCrAlY/HfB2复合涂层结构及高温摩擦学性能[J].中国表面工程,2012,25(2):69~74
HU Ze-xiang, LIU Jie-rui, GUO Chun, ZHOU Jian-song, ZHANG Shi-tang.Microstructure and Wear Resistance of Laser Cladding NiCoCrAlY/HfB2 Coating at Elevated Temperature[J].China Surface Engineering,2012,25(2):69~74
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激光熔覆NiCoCrAlY/HfB2复合涂层结构及高温摩擦学性能
胡泽祥， 刘杰瑞， 郭纯， 周健松， 张世堂1,2,3
1.中国人民解放军92117部队， 北京 100072;2.中南大学 材料科学与工程学院， 长沙 410083;3. 中国科学院兰州化学物理研究所， 兰州 730000
摘要:
利用激光熔覆技术在纯钛表面制备了NiCoCrAlY/HfB2复合涂层。用XRD和SEM分析了涂层的组成和组织结构，在SRVIV微动摩擦磨损试验机上对涂层不同温度下的摩擦磨损性能进行对比测试，采用SEM和三维表面轮廓仪对磨损后试样、对偶球和磨屑的形貌进行了分析。结果表明：NiCoCrAlY/HfB2复合涂层主要组成为NiTi、HfB2、TiB2、Co3Ti、CrTi4和Hf3Ni7相，复合涂层与基材冶金结合，涂层晶体结构主要为块状晶。涂层的平均显微硬度约为850 HV0.2，是基材硬度的4.25倍。在20 ℃、100 ℃、300 ℃和500 ℃摩擦测试温度下涂层的摩擦因数和磨损率随温度的升高而减小，复合涂层的磨损率在10-4～10-5 mm3/Nm数量级，具有较好的高温耐磨性能，涂层的磨损机制主要为磨粒磨损和黏着磨损。
关键词:  钛  激光熔覆  镍基涂层  高温摩擦磨损性能
DOI：
分类号:
基金项目:国家自然科学基金（51045004）；中科院知识创新工程（YYYJ0913）；创新群体基金（50421502）
Microstructure and Wear Resistance of Laser Cladding NiCoCrAlY/HfB2 Coating at Elevated Temperature
HU Ze-xiang, LIU Jie-rui, GUO Chun, ZHOU Jian-song, ZHANG Shi-tang1,2,3
1.The PLA 92117 Troops, Beijing 100070;2. School of Materials Science and Engineering, Central South University, Changsha 410083;3. Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000
Abstract:
NiCoCrAlY/HfB2 composite coating was prepared on pure Ti substrate using laser cladding technology. The composition and microstructure of the fabricated coating was analyzed by XRD and SEM. The tribological properties of NiCoCrAlY/HfB2 coating were examined by SRVIV tester at different temperature. The morphologies of the worn surface and debris were analyzed by SEM and three dimensional noncontact surface mapping. The results show that NiCoCrAlY/HfB2 composite coating is mainly composed of NiTi, HfB2, TiB2, Co3Ti, CrTi4 and Hf3Ni7 phases, and the composite coating is metallurgically bonded to the substrate. The microhardness of the coating is about 850 HV0.2, which is 4.25 times as much as the pure Ti substrate. Under the temperature of 20 ℃、100 ℃、300 ℃ and 500 ℃, NiCoCrAlY/HfB2 composite coating represents excellent wear resistance, the wear rate of which is 10-4～10-5 mm3/Nm order of magnitude. The friction coefficient and wear rate of the NiCoCrAlY/HfB2 composite coating all decreased with increasing temperature. The wear mechniasim of composite coating is dominated by abrasive wear and adhesion wear.
Key words:  titanium  laser cladding  Nibased coating  high temperature friction and wear properties
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