Ca-(Mg)-Sialon陶瓷的水基润滑研究

利用SRV球-盘磨损实验机考察了Sialon陶瓷在空气、水及三种钠盐溶液中的摩擦学性能，并用X光电子能借（XPS）揭示了摩擦化学反应对Sialon陶瓷摩擦学性能的影响．研究表明，在空气及水中，CM-60（（Ca，Mg）-α-Sialon）都具有比C-60（Ca-α-Sialon）好的抗磨性；水降低了两种Sialon陶瓷（CM-60和C-60）的摩擦系数，但增大了其磨损体积．CM-60在三种钠盐溶液中的磨损体积顺序为：硝酸钠＞磷酸钠＞次亚磷酸钠；CM-60在三种钠盐溶液及水中的摩擦系数顺序为：硝酸钠＞水＞次亚磷酸钠＞磷酸钠．XPS分析表明，水同Sialon陶瓷表面氧化物的反应，造成了陶瓷的腐蚀磨损，从而，在水及盐溶液中，Sialon陶瓷的磨损体积都有所增加．

Tribological Study of Sialon Lubricated by Water-Based Lubricants

The tribological properties of Sialon in air, water and three different sodium solutions were carried out by using SRV ball-on-disk tribo-tester. The tribological test results demonstrate that either under dry sliding or water lubrication, CM-60 shows better anti-wear properties than C-60; water lubrication reduces the friction coefficients of both Sialon ceramics (CM-60 and C-60) but increases their wear volumes. The wear volume order of CM-60 in the three different sodium solutions is as follows: NaNO3 >Na3PO4 >NaH2PO2 ) it indicates that the anti-wear properties of these Na salt solutions are correlated with their oxidation ability; the friction coefficient order of CM-60 in water and three different sodium solutions can be described as: NaNO3 >H2O>NaH2PO2 >Na3PO4.All of these lubricants made the wear surfaces of Sialon ceramics quite smooth. It means that sodium salt solution can be used in chemical polishing of Sialon. Results also show that the reaction between water and the oxides of Sialon has led to corrosion wear of Sialon. Thus, both in water and Na salt solutions, the wear volumes of Sialon ceramics were increased.