3D打印SLM工艺用球形钛合金粉制备工艺及性能研究

Study on Technology and Properties of Spherical Titanium Alloy Powder for 3DPrinting SLM Process

以不规则形态TC4钛合金粉末为原料,采用感应等离子球化技术制备出3D打印选区激光熔化工艺(SLM)用细粒径球形钛合金粉,通过扫描电子显微镜(SEM)、激光粒度分析仪对粉末形貌、粒度进行表征分析。结果表明:原料粒度、送粉速率以及等离子功率等对球化后钛合金粉末颗粒的球化率及表面状态有重要影响,在其他工艺参数不变的前提下,送粉速率过小、等离子功率过大,球形钛合金粉末表面状态欠佳;送粉速率过大、等离子功率过小,球形钛合金粉末球形率欠佳。根据影响规律,选定最优工艺参数,等离子功率14kW,对制备的球形钛合金粉基本性能进行表征,其中球形钛合金粉粒径主要分布在20~50μm,占比达95.62%,Fe、O等总杂质含量为0.51%,松装密度、振实密度、流动性分别为2.40g/cm^(3)、2.68g/cm^(3)、38s/50g,产品性能达到SLM工艺要求。

Fine diameter spherical titanium alloy powder for 3Dprinting selective laser melting(SLM)was prepared by induction plasma spheroidization with irregular TC4titanium alloy powder as raw material.The powder morphology and particle size were characterized via scanning electron microscope(SEM)and laser particle size analyzer,respectively.It indicates that the particle size of raw material,powder feeding rate and plasma power have important effects on the spheroidization rate and surface state of titanium alloy powder after spheroidizing.On the premise of the same other process parameters,the surface state of spherical titanium alloy powder is not optimal if the powder feeding rate is too low or the plasma power is too high;the sphericity of spherical titanium alloy powder is not optimal if the powder feeding rate is too high or the plasma power is too low.According to the influence law,optimum technological parameters were selected and plasma power was confirmed to be 14kW.The basic properties of the spherical titanium alloy powder were characterized.The particle size of spherical titanium alloy powder was mainly distributed in the range of 20—50μm,accounting for 95.62%.The total impurity content of Fe and O was 0.51%.The bulk density,tap density and fluidity were 2.40g/cm^(3),2.68g/cm^(3) and 38s/50g respectively.The product performance meets the requirements of SLM process.