摘要：

A novel spark plasma discharge (SPD) process is proposed to produce superalloy fine powders, and the model machines were designed. Compared to conventional powder processing techniques, such as plasma rotating electrode process and argon gas atomization, this method is based on another principle, and has advantages of faster cooling rate and simpler equipment for producing finer alloy powders. The experimental results of two superalloys indicate that the powders produced are spherical particles with a narrow size distribution, high spherical degree, smooth surface, absence of dendrites and single powder consists of spherical crystals with more homogenous structure.

展开