核主泵备用机械密封材料的摩擦性能研究

Study on Frictional Performance of Mechanical Seal Spare Material Used for Nuclear Coolant Pump

采用Falex-1506摩擦磨损试验机,研究了水润滑、室温条件下,载荷和速度对核主泵用机械密封材料:无压烧结碳化硅(WNV2)和碳化硅加碳(CHV1)、反应烧结碳化硅(R)和碳化硅加碳(R2)、石墨(MSMG)在不同配副条件下摩擦学特性的影响规律。使用扫描电镜(SEM),对磨损表面进行了观察和分析。研究结果表明,碳化硅和石墨材料自身的孔隙,在高载荷下容纳了更多的润滑流体,因此,不同配副条件下的摩擦系数均随载荷的增加而减小。另外,滑动速度引起的温度改变通过影响表面层性质影响摩擦力,而碳化硅和石墨在很宽的温度范围内机械性质保持不变,所以摩擦系数随速度的增加基本不变。

It was studied that the effection of load and velocity on the frictional performance of mechanical seal material used for nuclear coolant pump： sintered pressureless bonded SiC（WNV2） and graphite-added silicon carbide（CHV1）,sintered reaction bonded SiC（R） and graphite-added silicon carbide（R2）,and graphite（MSMG） using Falex-1506 tribo-machine.The morphology of the worn surfaces was observed using scanning electron microscopy（SEM） and the damage features were characterized.The results revealed that small holes in silicon carbide and graphite contain more fluid medias under high load,so the friction coefficient decreases with increasing applied load.Velocity affects friction force through the influence of temperature which changes the properties of surface.Mechanical properties of silicon carbide and graphite change little under a wide range of temperature,so the friction coefficient remains the same with increasing velocity.