Experimental Research on Residual Stress in Surface of Silicon Nitride Ceramic Balls

摘要

The influence of thermal stress produced in sintering and mechanical stress formed in lapping processrnon residual stress in surface of silicon nitride ceramic balls was discussed in this paper. By measuring specificrnvolume, the distribution of residual stress was analyzed and calculated. Some experimental researches on therninfluence of lapping process on residual stress in surface of the balls were made. The surface of silicon nitridernceramic balls presented residual compressive stress after sintering and residual tensile stress after lapping. Inrnlapping process, the abrasive particles were finer and the load acted on the lapped balls was large, the amplitude ofrnthe residual tensile stress in surface of silicon nitride balls was higher.