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纯Cr_2O_3和含10%金刚石微粒的两种Cr_2O_3喷涂层与Si3N4陶瓷球组成摩擦副,用摩擦磨损试验机进行不同载荷下的摩擦磨损实验。用型号为Hitachi-4800的扫描电镜和Micro XAM-100白光干涉仪分析两对摩擦副在不同载荷下的磨损形貌。结果表明,添加10%金刚石微粒的Cr_2O_3喷涂层的表面硬度和截面硬度均比纯Cr_2O_3涂层的高;随着载荷的增加,两种喷涂层的摩擦系数均呈现出降低趋势,且无论何种载荷作用下,纯Cr_2O_3涂层的磨损率有增大的趋势,而添加10%金刚石微粒的Cr_2O_3喷涂层的磨损率则呈现出相反的规律,且磨损率逐渐降低,表现出良好的减摩性能。干磨低载下Cr_2O_3涂层的磨损机理主要为粘着磨损和轻微的涂层剥落,高载下伴随轻微磨粒磨损;而含10%金刚石微粒的Cr_2O_3涂层具有良好的减摩特性,降低了涂层发生粘着和剥落的可能性。
Pure Cr_2O_3 and two kinds of Cr_2O_3 sprayed coatings containing 10% diamond particles and Si3N4 ceramic balls form a friction pair, and the friction and wear tests under different loads are carried out with a friction and wear tester. The wear morphology of the two pairs of friction pairs under different loads was analyzed by SEM and Micro XAM-100 white light interferometer with the model Hitachi-4800. The results show that the surface hardness and cross-section hardness of the Cr_2O_3 sprayed coatings added with 10% diamond particles are higher than that of the pure Cr_2O_3 coating. The friction coefficients of the two spray coatings show a decreasing trend with the increase of the load. The wear rate of pure Cr 2 O 3 coatings tends to increase under the load, while the wear rate of Cr 2 O 3 sprayed coatings with 10% diamond particles presents the opposite law, and the wear rate decreases gradually, showing good anti-friction performance . The wear mechanism of Cr_2O_3 coatings under dry-grinding and low-loading conditions is mainly that of adhesive wear and slight coating peeling, with slight wear of abrasive particles under high load. However, Cr_2O_3 coating containing 10% diamond particles has good anti-friction property and lowers Coating may stick and peel off.