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TC4 ELI钛合金表面搪瓷涂层制备及其磨损性能
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摘要
采用料浆烧结法在TC4 ELI钛合金表面制备了搪瓷涂层,利用原子力显微镜(AFM)、扫描电镜(SEM)、显微硬度计、摩擦磨损试验机、热震法等对涂层的表面三维形貌、磨痕形貌、显微硬度、摩擦学行为及涂层与基体的结合强度进行表征,对比分析了涂层与基体磨损前后的微观形貌,并对磨损机制进行探讨。结果表明,涂层组织致密,与基体结合良好,厚度约30μm,且均匀平整;与基体相比,其硬度显著提高;在干摩擦磨损条件下,涂层的磨损量较小,仅为基体的1/4,磨损率为基体的29.6%,表现出优异的耐磨性能;TC4 ELI钛合金的磨损机制为粘着磨损和磨粒磨损,搪瓷涂层的磨损机制为磨粒磨损。
An enamel coating was prepared on TC4 ELI titanium alloy surface by using slurry sintering process,and the surface three-dimensional morphology,grinding crack morphology,microhardness and the tribological behavior of the coating and bonding strength between the coating and substrate were characterized by means of atomic force microscopy(AFM),scanning electron microscopy(SEM),microhardness test,friction and wear testing machine and thermal shock method,respectively.The morphology of the coating and matrix before and after wear was comparatively analyzed,and the wear mechanism was discussed.The results show that the structure of the coating is compact and well combine with matrix The thickness of the coating is about 30/am,and it is uniform and smooth.Compared to matrix,the hardness of the coating improves obviously.Under the condition of dry friction and wear,the wear mass loss of the coating is little,and is only one quarter of the base metal.The wear rate of the coating is about29.6%that of the matrix.The coating shows excellent wear-resistance.The wear mechanism of the TC4 ELI titanium alloy is the adhesive and abrasive wear,while the enamel coating is the abrasive wear.
引文
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