By using a Q switched light pumped Nd: YAG laser and the laser processing technology called “single pulse at a time, repeated at intervals”, the regular network of micro dimples were textured on one of the seal end face. The tribological properties of laser surface textured mechanical seal as well as untextured mechanical seal were comparatively investigated under different sealed pressure and rotation speed on a computer aided testing device for mechanical seals. Experimental results show that within the experimental limits, the effect of laser surface texturing on improving the lubrication properties of mechanical seals is largely susceptible to the sealed medium pressure, but the influence of rotation speed is relative low. A comparison of the performance of laser surface textured mechanical seal with that of a baseline, untextured mechanical seal, is presented showing that laser surface textured mechanical seal can significantly improve the lubrication properties and the friction torque can be reduced at most 60% under the lower sealed medium pressure(such as 0.2 MPa). However, under the higher medium sealed pressure(such as 0.8 MPa), laser surface textured mechanical seal can improve the lubrication properties only when the rotation speed reached a critical value, and the effect is slightly lesser.
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