PREP工艺参数对GH3536高温合金粉末性能的影响

Effect of PREP Process Parameters on Properties of GH3536 Superalloy Powder

采用等离子旋转电极雾化法(Plasma Rotating Electrode Process,PREP)制备GH3536合金粉末,探究电极棒旋转速度和电流强度对粉末粒度及其物性能的影响。结果表明,粉末平均粒径随着旋转速度的提高而减小,当旋转速度为16000 r·min^(-1)时,粉末的D50粒径最小为27μm。在棒料转速一定时,随着主弧电流强度的增加,粉末的平均直径逐渐增大,当电流强度由1300 A提高至1500 A时,粉末D50粒度从33μm增加至42μm。此外,棒料旋转速度和主弧电流的增加能够改善GH3536粉末的流动性与松装密度。经过综合考虑,旋转速度14000 r·min^(-1)、电流1300 A、进给速度0.8 mm·s^(-1)工艺的参数组合最为适宜。

GH3536 alloy powder was prepared by Plasma Rotating Electrode Process(PREP).The effects of electrode rotation speed and current intensity on particle size and properties of GH3536 alloy were investigated.The results show that the average particle size of the powder decreases with the increase of the rotation speed.When the rotation speed is 16000 r·min^(-1),the minimum particle size of D50 is 27μm.The average diameter of the powder increases with the increase of the main arc current intensity when the rod speed is constant.When the current intensity increases from 1300 A to 1500 A,the particle size of the powder D50 increases from 33μm to 42μm.In addition,the fluidity and bulk density of GH3536 powder can be improved with the increase of rod rotation speed and main arc current.After comprehensive consideration,the parameter combination of rotation speed 14000 r·min-1,current 1300 A,feed speed 0.8 mm·s^(-1) process is the most suitable.