扫描速率对激光熔覆Ni基h-BN复合涂层组织及性能的影响

发布时间：2018-05-13 21:49

本文选题：激光熔覆 + 扫描速率　；参考：《金属热处理》2017年04期

【摘要】：使用半导体激光器在TC4合金表面制备了Ni60+10%h-BN复合涂层。使用OM、SEM、EDS显微硬度计和摩擦磨损试验机等分析了扫描速率对涂层宏观形貌、稀释率、显微组织、硬度及摩擦磨损性能的影响。结果表明,随着扫描速率的加快,熔覆层宽度、高度、基体熔深、稀释率均减小。获得了以γ-Ni为增韧相,TiC、CrB、TiB_2、TiB为增强相,h-BN为润滑相的自润滑复合涂层。随着扫描速率的加快,熔覆层平均显微硬度呈现先升高后降低的规律,扫描速率V=8 mm/s时显微硬度、摩擦磨损性能达到最佳,显微硬度大约为1200 HV0.5、摩擦因数在0.37~0.40之间、磨损量为2.6 mg。
[Abstract]:The Ni60 10%h-BN composite coating was prepared on the surface of TC4 alloy by semiconductor laser. The effects of scanning rate on the macroscopic morphology, dilution rate, microstructure, hardness and friction and wear properties of the coatings were analyzed by means of OMZEDS microhardness tester and friction and wear tester. The results show that the width, height, penetration depth and dilution rate of the cladding layer decrease with the increase of the scanning rate. A self-lubricating composite coating with 纬 -Ni as toughening phase and TiCnCrBnTiB2TiB as reinforcing phase h-BN as lubricating phase was obtained. With the acceleration of the scanning rate, the average microhardness of the cladding layer increased first and then decreased. When the scanning rate was 8 mm/s, the friction and wear properties of the cladding layer reached the best, the microhardness was about 1200 HV0.5, and the friction coefficient was between 0.37 and 0.40. The wear capacity is 2.6 mg.
【作者单位】：天津工业大学机械工程学院;天津市现代机电装备技术重点实验室;
【基金】：国家自然科学基金(51371125)
【分类号】：TG174.4

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