碳化铬-镍铬涂层对几种陶瓷的滑动摩擦磨损

在ＭＭ－２００块－环接触磨损试验机上，测定了等离子喷涂碳化铬－镍铬涂层对烧结Ａｌ２Ｏ３、热压烧结Ｓｉ３Ｎ４、ＳｉＣ和等离子喷涂ＴｉＯ２涂层等四种陶瓷材料在干摩擦条件下的滑动摩擦系数和磨损量；利用ＳＥＭ、ＥＤＡＸ和ＸＲＤ等技术，观察和分析了摩擦副材料在磨损后的形貌、物质转移和物相转变；讨论了摩擦副材料的显微结构和某些物理性能、机械性能对碳化铬－镍铬涂层摩擦磨损行为的影响，结果表明：涂层与不同陶瓷对磨，不仅其磨损量相差很大，而且其摩擦磨损机理也不相同，摩擦磨损过程中对磨材料向涂层表面的转移，有利于提高涂层的耐磨能力。配对陶瓷的显微颗粒尺寸和弹性模量愈小，导热系数愈高，则与碳化铬－镍铬涂层的配对性能愈好。

Sliding Friction and Wear of Chromium Carbide-Nickel Chromium Coating Against Ceramic Materials

Plasma sprayed chromium carbide-nickel chromium coating was mated as dry sliding pairs to sintered Al 2O 3, hot-pressing sintered Si 3N 4, SiC and plasma sprayed TiO 2 coating. The friction coefficients and wear mass losses of these friction pairs were measured using a MM-200 wear tester by a block-on-ring arrangement. The morphologies, element distributions and phase compositions of wom tracks and debrises of them were examined employing SEM, EDAX and XRD respectively. The results obtained showed that the wear mass losses of chromium carbide-nickel chromium coating and the friction and wear behavior and mechanism of it are dependent on the mated ceramic materials. The formation of transferred layer of mated ceramics on the coating surface improved the wear resistance of the coating. The smaller the micropaticles and elastic modulus, and the higher the thermal conductivity of mated ceramics, the better the wear resistance of the coating. The relationships between the friction and wear of chromium carbide-nickel chromium coating and the microstructures and some physical and mechanical properties of mated ceramic materials were also discussed.