核电主泵轴瓦磨损原因分析

核电主泵释热率持续上升，经检查发现主泵轴瓦局部瓦面发生严重磨损。为了分析轴瓦面磨损的原因和情况，本研究对轴瓦进行物理性能测试，并采用Archard公式对磨损程度进行定性分析。研究结果表明，渗硅石墨轴瓦的线膨胀系数偏大，使液膜厚度减小，易导致液膜破坏，且不利于轴瓦冷却；轴瓦材料分布不均易磨损产生微粒，及液膜中含气量上升，使轴瓦间空蚀现象加剧，局部液膜破坏导致干摩擦。分析表明，主泵运行期间，只有保持连续液膜的完整性，才能避免轴瓦出现磨损。 

Analysis on Wearing of Bearing for Main Pump in Nuclear Power Plant

The heat release rate of the main pump in nuclear power plant continued to rise, it was found that the bearing surface of main pump was abnormal worn through inspection. In order to analysis the causes and the level of the wearing of the bearing surface, the physical properties of the material of the bearing were tested, and the wear degree was analyzed qualitatively by using Archard formula. The results show that the larger the thermal expansion coefficient of the bearing is, the thinner the thickness of the liquid film is, which is easy to cause the damage of the liquid film and is not conducive to the cooling of the bearing. The uneven distribution of the material of bearing is easy to the wear particles produced, and the gas in the liquid film is increased, both of which make that the cavitation phenomenon between the bears more serious and the liquid film is local damaged and the dry friction is happened.