气雾化参数对304不锈钢3D打印专用粉末粒径的影响

Effect of atomization parameters on particle size of 304 stainless steel powders exclusively for 3D printing

为了研究采用EIGA法制备304不锈钢3D打印专用粉末过程中加热功率、进给速度和气雾化压力对粉末粒径的影响,利用JIGA-2型真空气雾化制粉设备进行了工艺试验.结果表明,加热功率对该合金粉末粒径的影响不大,而提高气雾化压力能够显著提高细粉收得率,进给速度与加热功率的匹配性是影响该合金粉末球形度的重要因素.304不锈钢3D打印专用粉末的最佳制备工艺参数为:加热功率30 kW,气液流量比0.6,气雾化压力6 MPa,此时细粉收得率约为35%~40%,粉末形貌为球形,且表面光滑未出现凹坑现象.

In order to study the effect of heating power,feeding speed and atomization pressure on the particle size of 304 stainless steel powders prepared by EIGA method exclusively for 3D printing,technological tests were performed on a JIGA-2 vacuum atomization apparatus for powder manufacturing.The results show that the heating power has no considerable effect on the particle size of alloy powders,but the yield of fine powders can be considerably enhanced by increasing atomization pressure.The matching between feeding speed and heating power is the key factor influencing the sphericity degree of alloy powders.The optimal technological parameters for the preparation of 304 stainless steel powders exclusive for 3D printing are as follows:heating power 30 kW,gas-liquid flow ratio 0.6 and atomization pressure 6 MPa.The yield of fine powder under this condition is within the range from 35%to 40%,and the powder morphologies are sphere and smooth without surface pits.