In order to overcome the shortcomings of present switch slide baseplates, a kind of epoxy composite was designed as lubricating coatings for switch slide baseplates. The wear tests of epoxy composite specimens paired with A36 steel specimens under air-lubricated condition were carried out on a ring–block wear tester typed M200. After the wear tests, the worn surfaces of steel specimens were examined by XPS and SEM. Furthermore, the wear reduction mechanism of graphite and MoS2 was discussed. The results showed that the graphite in epoxy composite can reduce the friction coefficient effectively, and increase the wear resistance of the epoxy composite greatly. MoS2 in epoxy composite is translated to MoO3 during the wear tests. Consequently, the friction coefficient of the pair cannot be decreased because MoO3 has not a layer structure. But MoS2 can effectively improve the wear resistance of the composite through restraining the epoxy transfer from the surface of composite to the surface of A36 steel.

In this study, Na2SiO3, Na2MoO4, (NH2) NS and (NaPO3) 6 were selected as inhibitors to slow down the corrosion of gray iron in distilled water. Furthermore, the wear tests of Si3N4-gray iron pair lubricated with these inhibited solutions were carried out on a ring-block tester. The worn surfaces of specimens were observed under SEM and optical microscope. The components and structure of tribofilm formed on the worn surfaces of specimens were analyzed by XPS. The results indicate that the Na2SiO3 inhibitor can effectively prevent the gray iron from corrosion when its concentration in distilled water ranges between 0.01 and 0.1 mol/l. In the wear tests of Si3N4-gray iron pair under o.1 mol/l Na2SiO3 solution lubricated condition, the friction coefficient is as low as that of Si3N4-gray iron pair lubricated with distilled water. And the wear amounts of the Si3N4 and iron specimens are smaller than that lubricated with distilled water. The superior tribological characteristics are due to a tribochemical film formed on the wearing surfaces. The film consists of gel type amorphous SiO2 and silicates and makes the paired surfaces smooth.

Using distilled water and air lubricants, wear tests of ceramic-cast iron pairs were carried out on a M-200 type ring-block wear tester. For comparison, ceramic-carbon steel pairs were also tested under the same conditions. The worn surfaces of specimens were observed under scanning electron microscope (SEM) and optical microscope. Furthermore, the tribofilms were analyzed by using Augerelectron spectroscopy (AES), energy-dispersive X-ray spectroscopy (EDX) and image analysis technique. In the wear tests of Si3N4-cast iron pairs lubricated with distilled water, the friction coefficients of the pairs are just 0.02, and the wear rates of ceramic and iron are near zero. The superior triboiogical eharaeteristics are due to a tribochemical film. which is formed on the wearing surfaces and has sufficient thickness and area. However, in the test of a Si3N4-carbon steel pair lubricated with distilled water, the friction coefficient is still high because the tribochemicai film formed on the wearing surface is too thin and too small. A metal transfer film is formed on the ceramic surface when the ferrous metals slide against Al2O3. In this situation, the wear amount of Al2O3 is quite small, but the wear amount of the metals is large and the friction coefficient is rather high.

利用高速液/固双相流冲蚀磨损试验机模拟不同试验条件，对改性28Cr高铬铸铁进行了不同冲蚀速度下的抗冲蚀磨损性能研究，着重讨论了该材料奥氏体基体的形变强化机理。研究结果表明：改性28Cr高铬铸铁材料中的高硬度相碳化物发挥了优越的抗磨削作用，同时保护了基体；在34m/s和45m/s冲蚀速度下，后者的冲蚀磨损量及增加速度远大于前者的，同时相变马氏体的相对体积分数从试验前的1613%分别增加到4212%和7316%，冲蚀磨损过程中亚表面变形层内基体产生的相变和位错密度增加等形变强化是该材料耐冲蚀性能优异的另一重要原因。

在MMG-200高温氧化O冲刷腐蚀磨损试验机上，考察了Al2O3/不锈钢基、WC/不锈钢基表面复合材料在模拟湿法磷酸工况下的冲蚀磨损性能，并与目前在此工况中使用较好的高铬钢进行了对比。研究结果表明：当冲蚀角分别为30°和60°时，这两种复合材料的抗冲蚀磨损性能均优于高铬钢，而Al2O3/不锈钢基复合材料的抗冲蚀磨损能力又优于WC/不锈钢基复合材料；复合材料中陶瓷颗粒与金属基体的界面是影响其冲蚀磨损性能的主要因素，改善界面的抗腐蚀特性，预期可进一步提高复合材料的抗磨性。