玻璃质无机非金属自润滑复合涂层的研制及其摩擦学性能的考察  

The Development of a Glass Matrix Inorganic Non-Metal Self-Lubricating Composite Coating and the Study of its Tribological Characteristics

作　　者：张军[1] 赵家政[1] 鄂吉胜[1] 党鸿辛 

机构地区：[1]中国科学院兰州化学物理研究所固体润滑开放研究实验室

出　　处：《固体润滑》1990年第4期241-247,共7页

基　　金：中国科学院青年研究奖励基金资助

摘　　要：作者用熔烧法制备了一种以玻璃相为骨架的自润滑复合涂层。试验结果表明,这种涂层在盐酸和氢氧化钠溶液中的摩擦磨损性能良好。引入过渡层可以改善涂层与底材间的物理匹配,加入氟化物、稀土氧化物(CeO_2)和三氧化二铬对涂层的显微结构和摩擦学性能具有重要影响。CeO_2添加量为3.0％的涂层在摩擦过程中产生的断裂颗粒可能会落入小孔而发生部分滚动,而且小孔中储存的溶液还可以承受部分载荷,因而在本试验条件下这种涂层的摩擦系数最低。A self-lubricating composite coating was prepared by melting method. The glass matrix was used for skeleton of this coating, which consists of BaO (16.6) , Si02 (45.8) , Cr2O3 (9.1) , K2O (10.3) , CaO (6.3) , CaF2/BaF2 (8.8) and CeO2 (3.0) . In order to improve the binding strength between the coating and substrate, a thick intermediate layer between the substrate and coating was added, the composition of this layer is BaO(28.8), SiO2 (27.9) , Cr2O3 (29.1) , CaO (2.58) , Z nO (3.60) , MoO3 (1.36) , Bentonite (2.91) and B2O3 (3.74) . The friction testing results showed that the anti-friction ability was increased by adding a small amount of fluoride into the coating. The fluoride reacted with silicon to form volatile matter under high temperature. Some bulbes were formed in the coating by cooling some of the volatile matter. The bulb distribution could be changed by adding rare earth oxide (CeO2) . It is suggested that the bulbes can break off or decrease the crack extension. The extension degree and pathway of crack depend on the bulbes' size and distribution, so under a given stress, the sizes of fracture particles are also different. The bulbes distribution is the best when CeO2 content is 3.0%. Under this condition, the resulted friction induced fracture particles may fall in the microvoids to roll. . Since the rolling, replaces part of sliding, the friction coefficient decreases} 'when the CeO2 content is less or more than 3.0%, because the abrasive dust' size is smaller or bigger than microvoids size, the friction coefficient ,ean not be changed. The liquid which exists in microvoids can bear the part of loadr ,therefore the friction coefficient further decreases. The test results indicated that the self-lubricating composite coating in which the CeO2 content is 3.0% possess good friction-wear characteristics in the HCl'and NaOH solutions.

关 键 词：玻璃质 涂层 摩擦学 润滑 性能 

分 类 号：TG174.45[金属学及工艺—金属表面处理]