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20CrMo上沉积CrN涂层的力学性能及5W/40润滑下的摩擦学性能 刘吉良 1 , 廖日东 1 , 罗 军 2 , 廖 斌 3 , 吴先映 3 , 刘庆义 4 , 黄 鹏 4 （1. 北京理工大学 机械与车辆学院，北京 100081；2. 北京市辐射中心，北京 100875；3. 北京师范大学 核科学与技术学院，北京 100875；4. 潍柴动力股份有限公司 内燃机可靠性国家重点实验室，山东 潍坊 261001） 摘要： 针对高强化柴油机活塞销减摩的需求，在其材料（20CrMo）上沉积了 5 种不同厚度的 CrN 涂层，研究其力学性能及发动机油 5W/40 润滑下的摩擦学性能。对不同厚度的 CrN 涂层，利用场发射扫描电子显微镜（FE-SEM）、三维形貌仪、纳米硬度仪测试涂层的形貌、硬度和弹性模量；通过划痕试验测试高温膜基结合性能；探讨了不同接触压力和不同转速下 CrN 涂层与锡青铜（QSn7-0.2）配副以及基材 20CrMo 与 QSn7-0.2 配副在 5W/40 润滑下的摩擦学性能差异，并分析了接触电阻。结果表明：20CrMo 上沉积 CrN 涂层厚度均匀，表面平整，其沉积厚度对 CrN 涂层的硬度等力学参数的影响较。愿呶履せ岷闲阅艿挠跋旖洗。在5W/40润滑下，CrN涂层与QSn7-0.2配副相对于20CrMo与 QSn7-0.2 配副在接触压力较大或较小的大部分区域都具有相对较低的摩擦因数，且磨损体积极小。 关键词： 高强化柴油机；活塞销；CrN 涂层；力学性能；摩擦学性能 中图分类号： TG174.444；TH117.1 文献标识码： A 文章编号： Tribological Properties Under 5W/40 Oil and Mechanical Properties Based on CrN Coated 20CrMo LIU Ji-liang 1 , LIAO Ri-dong 1 , LUO Jun 2 , LIAO Bin 3 , WU Xian-ying 3 , LIU Qing-yi 4 , HUANG Peng 4 (1. Beijing Institute of Technology, School of Mechanical Engineering, Beijing, 100081; 2. Beijing Radiation Center, Beijing, 100875; 3. Beijing Normal University, College of Nuclear Science and Technology, Beijing, 100875; 4. Weichai Power Co., Ltd., State Key Laboratory of Engine Reliability, Shandong Weifang, 261001) Abstract: For the low wear requirements of a highly intensified diesel engine piston pin, the five CrN coatings with different thickness were deposited on the 20CrMo of piston pin material. The mechanical properties and tribological properties under the engine oil 5W/40 lubrication were studied. The morphologies, hardness and the elastic modulus of the CrN coatings were tested through FE-SEM, optical profilometer and nano-hardness tester; The high temperature adhesion strength of the coating was tested by scrach tests; The differences in the tribological properties of the CrN coating against the tin bronze (QSn7-0.2) and the 20CrMo substrate against the QSn7-0.2 were investigated under the 5W/40 oil as well as under different contact pressures and sliding speeds. Also, the contact resistance was analyzed. The results indicate that the CrN coating deposited on the 20CrMo substrate displays a uniform thickness and a smooth surface. The thickness of CrN coating has little impact on the hardness and other mechanical parameters. In contrast, it highly affects the high temperature adhesion properties. Compared to the 20CrMo against the QSn7-0.2, the CrN coating against the QSn7-0.2 exhibites a relatively low friction coefficient in most areas of higher or lower contact pressure and the wear volume is minimal for the 5W/40 oil. Key words: highly intensified diesel engine; piston pin; CrN coating; mechanical properties; tribological properties 收稿日期：2017-07-14；修回日期：2017-11-06 网络出版日期： 网络出版地址： 通讯作者：刘庆义（1963-），男(汉)，研究员，学士；研究方向：内燃机工艺、新材料技术及快速成型技术；E-mail: liuqy@weichai.com 基金项目：内燃机可靠性国家重点实验室开放基金（SKLER-201607） Fund: Supported by by Science Fund of State Key Laboratory of Engine Reliability (SKLER-201607) 引文格式：刘吉良, 廖日东, 罗军, 等. 20CrMo 上沉积 CrN 涂层的力学性能及 5W/40 润滑下的摩擦学性能[J]. 中国表面工程, 2017, 30(6): doi: 10.11933/j.issn.1007−9289.20170714001.LIU J L, LIAO R D, LUO J, et al. Tribological properties under 5W/40 oil and mechanical properties based on CrN coated 20CrMo [J]. China Surface Engineering, 2017, 30(6): doi: 10.11933/j.issn.1007−9289.20170714001. doi: 10.11933/j.issn.1007 − 9289.20170714001 http://kns.cnki.net/kcms/detail/11.3905.TG.20171108.1554.002.html网络出版时间：2017-11-08 15:54:55