Abstract:In view of the problems of unstable quality and low production efficiency in the presence of the normal pressure impregnation process,a kind of vacuum impregnation device was developed for the paperbased friction materials,and the vacuum impregnation technology was proposed.Several kinds of paperbased friction materials were prepared by vacuum impregnation device,their porosity and tribological properties were tested,and the test results were compared with that of the materials prepared by the normal pressure impregnation process.The result shows that the paperbased friction material prepared by vacuum impregnation technology has stable porosity and good consistency.Compared with the material prepared by the normal pressure impregnation process,the average porosity of the material prepared by vacuum impregnation technology is increased by 8%,the average dynamic friction coefficient is higher than 1429%,the average static friction coefficient is higher than 1074%,and the average wear rate is decreased by 5165%.The production efficiency of vacuum impregnation technology is higher than that of normal pressure impregnation technology,and can save the amount of raw adhesive and solvent.