摘要
研制了几种可以在大气中直至300℃下使用的镶嵌型固体润滑材料,考察了胶粘剂、添加剂、湿度和温度等对固体润滑剂热膨胀性能及镶嵌材料摩擦磨损性能的影响。作者采用的“栓(球)-盘”试验方法,可以定性地比较固体润滑剂对金属的转移性能,加快了镶嵌用固体润滑剂配方的筛选进程。试验结果表明,3号配方的镶嵌试样在250和300℃时的比磨损分别为7.8×10^(-13)mm/Pa·m和16.2×10^(-13)mm/Pa·m,最大摩擦系数为0.42。通过X-射线衍射分析认为,这种材料在高温下的高摩擦现象应归因于摩擦表面氧化产生的Cu_2O。
Several embeded solid lubrication materials which are used below 300℃ in the air were developed in this paper. After determining the type of matrix and embeded proportion of solid lubricant in f he slide surface layer, the tribological property of this kind of material is dependent upon the t hermoexpansion behavior of solid lubricant, it's transfer characteristic to metal and wear resistance of the transfer film. The transfer characteristics of some solid lubricant mixture to metal and the anti-wear properties of transfer films were qualitatively compared by pin (ball)-disk test, and their t hermoexpansion property was also studied for promoting the course of selecting formula. We selected four formulase concerning to adding NaF, high-temperature resin and MoS2 into graphite. Under the conditions of different temperature and humidity the friction-wear test was performed in the atmosphere after embeding the solid lubricant into the foundry tin bronze matrix. The test results showed that two formulated Samples process satisfactory anti-wear life under conditions of 200℃. The specific wear of No. 3 formula sample is 7.8× 10-13and 16.2×10-13 mm/Pa·m respectively under different temperature (250 and 300℃ . The highest friction coefficient is 0.42. The anti-wear property could be improved at 100℃ by adding a PTFE expansion pad to the end of embeded solid lubricant mixture for enhancing the expansion amount. The X-ray diffraction analysis of tested matrix and surfaces of the frictional couple shown that the high-friction coefficient of this material at high temperature condition is ralited to Cu20 which is resulted from the oxidation of tin bronze surface. NaF acts mainly to promote the expansion of solid lubricant mixture.
出处
《固体润滑》
CSCD
北大核心
1991年第1期35-44,共10页
基金
国家自然科学基金资助项目
关键词
固体润滑材料
摩擦磨损
镶嵌型
high-temperature embeded material, thermoexpansion property, transfer film, friction-wear property, PTFE expansion pad, pin (ball)-disk test, foundry tin bronze
