循环使用Ti-6Al-4V粉末对粉体特性的影响

试验研究了电子束3D打印循环使用Ti-6Al-4V对粉体特性的影响。结果,随循环次数增加,细粉减少,颗粒间粘结增加,颗粒粒度分布向粗颗粒聚集,粉床上颗粒摩擦阻力下降、压缩性升高,块状残留物也增加,吹粉倾向增大;循环使用粉末对构件轮廓成形、轮廓尺寸几乎没有影响,而使相对致密性下降。添加新粉能改善旧粉的不利影响,改善程度与添加新粉数量有关。

Effect of Circulating Ti-6Al-4V on Powder Holding Property

The effect of Ti-6Al-4V on the powder properties was studied. Results: with the increase of the number of cycles, the fine powder decreased, the adhesion between particles increased, the particle size distribution gathered to the coarse particles, the friction resistance of particles on the powder bed decreased, the compressibility increased, the block residue also increased, and the tendency of powder blowing increased; the recycling powder had little effect on the contour forming and the size of the components, but the relative compactness decreased. Adding new powder can improve the adverse effect of old powder, and the improvement degree is related to the quantity of new powder.