Tribological performance of UV picosecond laser multi-scale composite textures for C/SiC mechanical seals: Theoretical analysis and experimental verification
Tribological performance of UV picosecond laser multi-scale composite textures for C/SiC mechanical seals: Theoretical analysis and experimental verification
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DOI：
10.1016/j.ceramint.2021.04.312
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发表时间：
2021-05
影响因子：
5.2
通讯作者：
Tianyang Chen;J. Ji;Yonghong Fu;Xiping Yang;H. Fu;Lunan Fang
中科院分区：
文献类型：
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作者：
Tianyang Chen;J. Ji;Yonghong Fu;Xiping Yang;H. Fu;Lunan Fang
采用螺旋槽和微凹坑的多尺度复合织构可以提高机械密封的性能，但如果没有明确的织构作用机理，很难对密封表面的织构进行优化。本研究建立了基于质量守恒JFO空化边界的数学模型，分析多尺度复合微纹理的机械密封性能。采用多重网格法进行数值求解，研究了复合织构机械密封的流体动力润滑特性，并考察了微韧窝与螺旋槽的耦合效果。我们还分析了复合纹理的几何参数对密封性能的影响，并通过理论分析对密封表面纹理进行了优化。数值分析表明，多尺度复合织构机械密封产生微凹坑与螺旋槽之间的耦合作用，改善了密封副的润滑。最终，C/SiC 机械密封台架测试证实，在各种密封液体压力和转速下，与无纹理的密封件相比，复合纹理的摩擦学有所改善。通过比较Stribeck曲线，多尺度复合织构C/SiC机械密封比无织构的机械密封具有更低且更稳定的摩擦扭矩。
The performance of mechanical seals can be improved by using multi-scale composite textures with spiral grooves and micro-dimples, but without a clear texture function mechanism, it is difficult to optimize the textures on the sealing surface. This research established a mathematical model based on the mass-conservative JFO cavitation boundary to analyze the mechanical seal performance of multi-scale composite micro-textures. We use the multi-grid method for numerical solutions, investigate the hydrodynamic lubrication characteristics of composite-textured mechanical seals, and inspect the coupling effect of micro-dimples and spiral grooves. We also analyzed the influence of the geometrical parameters of composite textures on the sealing performance and optimized the sealing surface textures using theoretical analysis. The numerical analysis showed that the multi-scale composite-textured mechanical seal produced a coupling effect between the micro-dimples and spiral grooves, which improved the lubrication of the sealing pair. Eventually, C/SiC mechanical seal bench tests confirmed the tribological improvement of composite textures compared with the un-textured seal under various sealing liquid pressures and rotation speeds. Through comparing the Stribeck curve, the multi-scale composite textured C/SiC mechanical seals have a lower and more stable friction torque than the un-textured.