干摩擦机械密封端面材料配对性能的台架试验研究

为了研究密封端面材料配对对干摩擦机械密封性能的影响,使用自主设计研发的干摩擦机械密封试验系统,选择浸锑石墨、浸树脂石墨,分别与38CrMoAlA(不喷涂)、38CrMoAlA(表面喷涂Cr 2O 3)、40CrNiMoA(表面喷涂Cr 2O 3)3种典型的材料配对进行干摩擦和磨损试验,并对端面温升、磨损率、摩擦功耗和泄漏率等试验结果进行对比分析。结果表明:在干摩擦状态下,对于不同材料配对,摩擦磨损规律显示出了多元性;在6组端面配对中,浸锑石墨与38CrMoAlA(表面喷涂Cr 2O 3)配对性能最佳,浸金属石墨更适用于极端工况,摩擦磨损性能更佳,但浸树脂石墨材料密封性能更好,泄漏率更小;动环表面喷涂材料可有效提高动环表明硬度,优化表面结构,改善动环摩擦磨损性能和密封性能;动环基体材料对配对性能影响不可忽视,导热效果好、线膨胀系数低的材料可降低端面温度。

Bench Test Study on Matching Performance of Mechanical Seal End Materials under Dry Friction Condition

In order to study the influence of material groups on the performance of mechanical seal under dry friction condition,antimony-impregnated graphite and resin-impregnated graphite were selected to carry out experiments on the self-designed test system with 38CrMoAlA(no spraying),38CrMoAlA(surface spraying Cr 2O 3)and 40CrNiMoA(surface spraying Cr 2O 3)respectively.The test results of temperature rise,wear rate,friction power consumption and leakage rate of the end face were compared and analyzed.The results show that under dry friction condition,the friction and wear behavior of different groups of materials shows diversity.Among the six groups,antimony impregnated graphite and 38CrMoAlA(surface sprayed Cr 2O 3)have the best matching performance.Metal-impregnated graphite is more suitable for extreme working conditions and has better friction and wear properties.while resin-impregnated graphite has better sealing performance and less leakage rate.Spraying materials on the surface of the moving ring can effectively improve the hardness of the moving ring,optimize the surface structure,and improve the friction and wear performance and sealing performance of the moving ring.The influence of the matrix material of the moving ring on the matching performance can not be ignored.The material with good thermal conductivity and low linear expansion coefficient can reduce the end temperature of mechanical seal.