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CeO2含量对激光熔覆自润滑涂层微观组织和性能的影响

Effect of CeO2 Content on Microstructure and Properties of Laser Cladded Self-Lubricant Coatings

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摘要

采用激光熔覆技术在TC4基材表面制备了TiC+TiB2增强Ni基自润滑复合涂层,研究了CeO2含量对涂层物相组成、微观组织、显微硬度和摩擦磨损性能的影响。结果表明,添加不同CeO2含量涂层的物相主要由基底γ-Ni、陶瓷增强相TiC和TiB2、金属间化合物Ti2Ni及润滑相Ti3SiC2组成。添加适量的CeO2可以减小涂层增强相的尺寸,细化晶粒。当CeO2添加量为1.5%时,涂层的显微硬度为1400 HV左右,涂层的最小摩擦系数为0.22~0.24,最小磨损量为1.7 mg,涂层具有良好的自润滑耐磨性能。

Abstract

The TiC+TiB2 reinforced Ni-based self-lubricant composite coatings are prepared on the TC4 matrix surface by the laser cladding technique, and the effect of CeO2 content on the phase compositions, microstructures, microhardness and friction and wear performances of these coatings is investigated. The results show that the phase compositions of these coatings with different CeO2 contents are mainly composed of matrix γ-Ni, ceramic-reinforced phases of TiC and TiB2, intermetallic compound of Ti2 Ni, and lubricant phase of Ti3SiC2. The addition of suitable content of CeO2 can make the reinforced phase size decreased and grains refined. When the CeO2 content is 1.5%, the microhardness is around 1400 HV, the lowest friction coefficient is between 0.22 and 0.24, and the lowest wear mass loss is 1.7 mg, which indicate that these coatings possess nice self-lubricant and wear-resistant performances.

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中图分类号:TG174.44

DOI:10.3788/lop55.111401

所属栏目:激光器与激光光学

基金项目:国家自然科学基金(51371125)

收稿日期:2018-05-21

修改稿日期:2018-05-22

网络出版日期:2018-05-28

作者单位    点击查看

刘亚楠:天津工业大学机械工程学院, 天津 300387
孙荣禄:天津工业大学机械工程学院, 天津 300387天津工业大学天津市现代机电装备技术重点实验室, 天津 300387
张天刚:中国民航大学工程技术训练中心, 天津 300300
李眉葭:天津工业大学机械工程学院, 天津 300387

联系人作者:刘亚楠(tjgdlyn@163.com); 孙荣禄(rlsun@tjpu.edu.cn);

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引用该论文

Liu Yanan,Sun Ronglu,Zhang Tiangang,Li Meijia. Effect of CeO2 Content on Microstructure and Properties of Laser Cladded Self-Lubricant Coatings[J]. Laser & Optoelectronics Progress, 2018, 55(11): 111401

刘亚楠,孙荣禄,张天刚,李眉葭. CeO2含量对激光熔覆自润滑涂层微观组织和性能的影响[J]. 激光与光电子学进展, 2018, 55(11): 111401

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