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| 激光熔覆NiCr-ZrB2复合涂层结构及高温摩擦学性能 | |
| 引用本文： | 陈建敏,郭纯,姚润钢,周健松,张世堂.激光熔覆NiCr-ZrB2复合涂层结构及高温摩擦学性能[J].摩擦学学报,2012,32(4):313-319. |
| 作者姓名： | 陈建敏 郭纯 姚润钢 周健松 张世堂 |
| 作者单位： | 1. 中国科学院兰州化学物理研究所固体润滑国家重点实验室,兰州,730000 2. 中国船舶重工集团公司第七二五研究所,洛阳,471039 3. 中国人民解放军92117部队,北京,1000729 |
| 基金项目： | The project was supported by the National Natural Science Foundation of China (51045004). 国家自然科学基金(51045004)资助. |
| 摘 要： | 利用激光熔覆技术在纯钛表面制备了NiCr涂层和NiCr-ZrB2复合涂层.用X射线衍射仪、扫描电镜和高分辨透射电镜分析了涂层的组成、组织结构和晶体结构.在SRV-IV摩擦磨损试验机上对NiCr-ZrB2复合涂层从20到500℃的摩擦磨损性能进行了测试.结果表明:NiCr-ZrB2复合涂层的主要物相组成为Ni,Ti]固溶体、Cr2Ti、ZrB2、ZrB、Ni3Cr2、Ti2Cr、TiB2和TiB;涂层厚约0.7～1.0 mm;涂层平均硬度约为HV0.21000,是纯钛基材的5.3倍;NiCr-ZrB2复合涂层的摩擦系数和磨损体积随温度的增加而减小,高温耐磨性能相对于钛基材提高约1个数量级;NiCr-ZrB2复合涂层的磨损机理为磨粒磨损和黏着磨损,高温下伴有氧化磨损和摩擦抛光现象. |
| 关 键 词： | 钛 激光熔覆 镍基涂层 摩擦学性能 |
| 收稿时间： | 4/6/2012 12:00:00 AM |
Microstructure and High Temperature Tribological Properties of NiCr-ZrB2 Composite Coating |
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| CHEN Jian-min,GUO Chun,YAO Run-gang,ZHOU Jian-song and ZHANG Shi-tang.Microstructure and High Temperature Tribological Properties of NiCr-ZrB2 Composite Coating[J].Tribology,2012,32(4):313-319. | |
| Authors: | CHEN Jian-min GUO Chun YAO Run-gang ZHOU Jian-song and ZHANG Shi-tang |
| Institution: | Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences, Lanzhou 730000, China;Luoyang Ship Material Research Institute, Luoyang 471039, China;Luoyang Ship Material Research Institute, Luoyang 471039, China;Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences, Lanzhou 730000, China;The PLA 92117 Troops, Beijing 100070, China |
| Abstract: | NiCr coating and NiCr-ZrB2 composite coating are prepared on pure Ti substrate by the laser cladding.The composition and microstructure of the coatings are analyzed by X-ray diffraction,scanning electron microscopy and high resolution transmission electron microscopy.The tribological properties of NiCr coating and NiCr-ZrB2 composite coating are evaluated on a SRV-IV tribo-tester at elevated temperatures(20~500 ℃).The results show that NiCr-ZrB2 composite coating is mailnly composed of ,Cr2Ti,ZrB2,ZrB,Ni3Cr2,Ti2Cr,TiB2 and TiB phases.The NiCr-ZrB2 composite coating is metallurgically bonded to the titanium substrate,and the coating contains dentritic and block-like microstructure.In addition,the NiCr-ZrB2 composite coating has a microhardness of ca HV0.21000 and with thickness of 0.7~1.0 mm.The friction efficient and wear volume of the NiCr-ZrB2 composite coating decrease with increasing temperature.The NiCr-ZrB2 composite coating has higher wear resistance than that of titanium substrate.The wear mechanisms of NiCr-ZrB2 composite coating at elevated temperatures are abrasive wear and adhesive wear. |
| Keywords: | titanium laser cladding Ni-based coating tribological property |
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