论文部分内容阅读
作者在对PbWO_4进行化学反应热力学计算的基础上,利用高温栓-盘式摩擦试验机、差热、X-射线衍射与能谱等多种手段,又对PbWO_4的高温润滑特性及其有关的摩擦化学现象进行了考察,指出PbWO_4具有良好的高温热安定性和摩擦-温度特性,而于500℃以上加热后可以发生少量的正方晶形向斜方晶形的转变;在高温下PbWO_4可以与摩擦偶件中的Ni、Fe元素的氧化物发生化学反应生成少量的NiWO_4、FeWO_4及PbO_1.44,这有利于提高PbWO_4膜与底材的结合强度。
Based on the chemical reaction thermodynamics of PbWO_4, the authors used various methods such as high temperature plug-disk friction tester, differential thermal analysis, X-ray diffraction and energy dispersive spectroscopy to study the high temperature lubrication characteristics of PbWO_4 and its related friction Chemical phenomenon was investigated. It is pointed out that PbWO_4 has good high-temperature thermal stability and friction-temperature characteristics. However, a small amount of orthorhombic orthorhombic transformation can occur after heating above 500 ℃. PbWO_4 can react with frictional elements In the Ni, Fe element oxide chemical reaction to generate a small amount of NiWO_4, FeWO_4 and PbO_1.44, which is conducive to improve the PbWO_4 film and the substrate bonding strength.