转子转速和气体流量对2524铝合金除气效果的影响

采用水模拟实验和铝熔体除气实验相结合的方法研究了转子转速和惰性气体流量对旋转除气法除气效果的影响及其机理.研究结果表明转子转速和气体流量对除气效果具有重要的影响.随着转子转速的增加,气泡尺寸减小,作用的区域增加,除气速率提高.在一定范围内随着气体流量的增加,气泡数量增加,除气效率提高.但当气体流量过高时,气体在转子与熔体之间产生隔离作用,气泡影响区域减小,除气效果变差.在本研究范围内转速550~690 r/min,惰性气体流量1~3 L/min是合适的工艺参数.

Effects of Rotor Rotation Speed and Gas Flow Rate on the Degassing Efficiency of 2524 Aluminum Alloy in Rotary Degassing Process

The effects of rotor rotation speed and inert gas flow rate on rotary degassing efficiency are studied by using water simulation and direct aluminum melt degassing experiments and the mechanisms have been further discussed. The results show that the rotor rotation speed and gas flow rate in the rotary degassing process greatly affect the degassing efficiency. With increasing rotor rotation speed， the bubble size decreases and the affected region becomes larger， therefore the gas removal rate increases. When the gas flow rate in a certain range increases， the number of bubbles increases， corresponding to an improved gas removal efficiency. However， when the gas flow rate raises too high， the degassing efficiency decreases due to the reduce of affected region， which comes from the isolation of the gas layer formed between the rotor and melt. In the study， the appropriate parameters of the rotation speed and inert gas flow rate in the process are 550~690r/min and 1~3L/min， respectively.