【Abstract】 In this paper,the hydrolysis of silicon nitride in pure water and 005mol·L-1 H2SO4 solution under the condition of ultrasonic irradiation was studied,and the influences of ultrasonic power and reaction time on the hydrolysis of silicon nitride were investigated.In addition,we also compared the hydrolytic result of ultrasound with that of powerful agitation.The experimental results show that the hydrolytic ratio of silicon nitride is increasing with the rising of ultrasonic power and the lengthening of reaction time.The hydrolytic velocity in 005mol·L-1 H2SO4 solution is a little faster than that in pure water.And in lowpower ultrasound(100W～150W),the hydrolytic velocity is approximately equal to that in powerful agitation.However,the hydrolytic velocity is accelerated rapidly with the increasing of ultrasonic power.更多还原