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在环－块磨损试验机上考察了蒸馏水润滑下Ｓｉ３Ｎ４分别与白口铸铁和碳钢（作对比用）配副的摩擦磨损特性．在ＳＥＭ下观察了白口铸铁磨面表面膜的形成过程，用ＸＰＳ、ＦＴＩＲ和ＸＲＤ分析了表面膜的成分、组成与结构，并对其形成机理进行了探讨．结果表明，Ｓｉ３Ｎ４在水润滑下摩擦时磨面上发生了氧化和水解反应：当Ｓｉ３Ｎ４与白口铸铁配副时，由于铸铁中碳化物的剥落而形成剥落坑，Ｓｉ３Ｎ４磨屑嵌入剥落坑并氧化和水解，其反应产物富集于剥落坑中，脱水聚合后形成硅胶，从而在磨面形成具有一定厚度和面积的含硅胶的表面膜，表面膜的形成保护了陶瓷和铸铁磨面，使其变得很光滑，从而使摩擦系数降至０．０２，并使系统磨损率几乎接近于零；当Ｓｉ３Ｎ４与碳纲配副时，由于碳钢没有能力富集Ｓｉ３Ｎ４的氧化和水解产物，故磨面不能形成有效的表面膜，所以其摩擦系数仍然较高，且系统磨损率亦较大
The friction and wear characteristics of Si3N4 with white cast iron and carbon steel (for comparison) on the ring-block wear tester were investigated. The formation process of surface film of white cast iron was observed by SEM. The composition, composition and structure of the surface film were analyzed by XPS, FTIR and XRD. The formation mechanism of the film was also discussed. The results show that when Si3N4 is rubbed with water, oxidation and hydrolysis occur on the grinding surface. When Si3N4 is mixed with white cast iron, exfoliation crater is formed due to the spalling of carbides in the cast iron. Si3N4 wear debris is embedded in the exfoliation pit and oxidized And hydrolysis, the reaction product is enriched in the peel pits, the formation of silica gel after dehydration polymerization, so as to form a certain thickness and area of silica gel-containing surface film on the grinding surface, the formation of the surface film protects the ceramic and cast iron grinding surface, making it Becomes very smooth, so that the friction coefficient down to 0.02, and the system wear rate is almost close to zero; when Si3N4 and carbon Gang Pairs, because the carbon steel is not capable of enrichment Si3N4 oxidation and hydrolysis products, so the mill Surface can not form an effective surface film, so the friction coefficient is still high, and the system wear rate is also greater