水环境下酚醛树脂基滑动轴承材料组分和摩擦学性能的优化

Optimization of Components and Tribological Properties of Phenolic Resin Based Sliding Bearing Materials Under Water Environment

针对酚醛树脂(PF)基潜水泵滑动轴承材料存在吸水率过大、摩擦性能不足的问题开展了性能优化研究。以酚醛树脂为基体,添加石墨(Gr)、聚四氟乙烯(PTFE)、玻璃纤维(GF)、剑麻纤维(SF)、硫酸钡(BaSO_(4))对酚醛树脂进行改性,利用热压成形制备复合材料。通过正交试验设计,讨论了各填料不同含量对复合材料吸水率、体积膨胀率及摩擦学性能的影响。结果表明:复合材料吸水率和体积膨胀率的影响因素从大到小依次为GF:SF,PTFE,Gr,BaSO_(4);通过分析吸水率和体积膨胀率的均值,发现随着玻璃纤维含量的提高,复合材料吸水率和体积膨胀率降低;水环境下复合材料平均摩擦系数的影响因素从大到小依次为PTFE,Gr,BaSO_(4),GF:SF;复合材料磨损率的影响因素从大到小依次为GF:SF,Gr,BaSO_(4),PTFE。通过试验求得水环境下性能最优的复合材料配方为3%Gr,8%PTFE,20%GF,10%SF,16%BaSO_(4),43%PF。

The property optimization research is carried out to solve the problems of excessive water absorption and insufficient tribological properties of phenolic resin(PF) based submersible pump sliding bearing materials.Taking phenolic resin as matrix,the phenolic resin is modified by adding graphite(Gr),polytetrafluoroethylene(PTFE),glass fiber(GF),sisal fiber(SF) and barium sulfate(BaSO4),and the composites are prepared by hot pressing forming.The influences of different contents of fillers on water absorption,volume expansion and tribological properties of composites are discussed by orthogonal experimental design.The results show that:the primary and secondary factors affecting the water absorption and volume expansion of composites are GF:SF,PTFE,Gr,BaSO_(4).By analyzing the mean values of water absorption and volume expansion,it is found that the water absorption and volume expansion of composites decrease with the increase of glass fiber content;the primary and secondary factors affecting the average friction coefficient of composites under water environment are PTFE,Gr,BaSO_(4),GF:SF;the primary and secondary factors affecting the wear rate of composites are GF:SF,Gr,BaSO_(4),PTFE.The formula of composites with optimal properties under water environment is found through experiments to be 3% Gr,8% PTFE,20% GF,10% SF,16% BaSO_(4),43% PF.