Rheological Behavior of Water-Atomized 316L Stainless Steel Powder Depending on Particle Size

다국어 초록 (Multilingual Abstract)

In this study, we investigated the rheological behavior of three water-atomized 316L stainless steel powders mixed in abinder system based on a wax-polymer depending on powder particle size. The critical solids loadings determined viatorque rheometer experiments were the same regardless of particle size. Their viscosities were analyzed using a plate-platerheometer, and the rheological characteristics of the feedstock prepared using them were analyzed through the instabilityindex, flow behavior index, flow activation energy, and moldability index. The smaller particle-sized powder demonstratedhigher viscosity and increased instability at the same temperature, however, there was a critical temperature that affected theviscosity variation by improving the instability of feedstock. Regarding the rheological parameters (flow behavior index andflow activation energy), the power law-Arrhenius model was introduced and the results showed that a smaller particle sizemakes a feedstock more desirable for molding. On the other hand, the moldability index increased as the powder particlesize and temperature increased, revealing that viscosity has the greatest effect on moldability. The larger the powder particlesize, the greater the effect of temperature on viscosity.