Wear performance of TiC/Fe cermet electrical discharge coatings
Wear performance of TiC/Fe cermet electrical discharge coatings
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DOI：
10.1016/j.wear.2018.02.007
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发表时间：
2018-05-15
期刊：
影响因子：
5
通讯作者：
Clare, Adam T.
中科院分区：
文献类型：
--
作者：
Algodi, Samer J.;Murray, James W.;Clare, Adam T.
研究了使用半烧结 TiC 工具电极通过放电涂层 (EDC) 制备的 TiC 基金属陶瓷涂层的摩擦学行为。高速钢 (HSS) 和 304 不锈钢 (304-SS) 基材上的沉积涂层表现出复杂的微观结构，包括 Fe 基体中的 TiC 晶粒。与抛光后的基材相比，两种基材类型上的 TiC/Fe 金属陶瓷涂层的耐磨性均显着提高（比磨损率提高了一个和两个数量级）。此外，根据负载情况，HSS 上的 EDC 金属陶瓷涂层的耐磨性通常比 304-SS 上沉积的涂层高 2-4 倍，其耐磨性能反映了涂层的复合性质以及基材的机械性能。激光表面处理用于通过消除 ED 涂层的裂纹和孔隙特性来提高沉积涂层的表面完整性，从而提高所有样品的磨损率，但高负载条件下 HSS 上的涂层除外。磨损率的普遍增加归因于激光处理后ED涂层中TiC比例的显着降低以及晶粒尺寸的增加；而经激光处理、金属陶瓷涂层的高速钢在高负载下磨损性能的提高则归因于避免了磨料磨损机制。
The tribological behaviours of TiC-based cermet coatings, prepared by electrical discharge coating (EDC) using a semi-sintered TiC tool electrode, have been investigated. The as-deposited coatings exhibited complex microstructures, comprising TiC grains within an Fe matrix, on both high speed steel (HSS) and 304 stainless steel (304-SS) substrates. The wear resistance of TiC/Fe cermet coatings, on both substrate types, increased dramatically (one and two orders of magnitude improvement in specific wear rate), compared to as-polished substrates. Further, EDC cermet coatings on HSS were typically 2-4 times more wear resistant, depending on loading, than those deposited on 304-SS, with wear performance reflecting the composite nature of the coating coupled with the mechanical properties of the substrate. Laser surface treatments used to improve surface integrity of the as-deposited coatings, through elimination of cracks and porosity characteristic of ED coating, acted to increase wear rates for all samples, with the exception of coatings on HSS under conditions of high loading. The general increase of wear rate was attributed to a significant reduction in the proportion of TiC within the ED coatings, after laser treatment, combined with an increase in grain size; whilst improvements to the wear performance of laser treated, cermet coated HSS, under high loading, was attributed to the avoidance of an abrasive wear mechanism.