Influence of Particle Size on Apparent Diffusivity During Spark Plasma Sintering of Crystalline Powders
Source abstract
Abstract
A theoretical framework is presented to determine an apparent diffusivity D during powder sintering and further elucidate the underlying interrelation between D and shrinkage behaviors of powders. Furthermore, to eliminate the influence of crystalline defects that are typically present in raw powders, complete crystallization of metallic glass powders is performed to allow the investigation of the influence of particle size solely on powder densification. Furthermore, to validate the framework developed, Ti40.6Zr9.4Cu37.5Ni9.4Sn3.1 crystalline alloy powders constituting particles with different sizes are examined to establish a correlation between D and the sintering behaviors of the powders. The findings show that the value of the apparent diffusivity D increases with the increasing particle size, which accelerates powder densification during spark plasma sintering. Furthermore, the results quantitatively support the argument that particle size can affect atomic diffusion during powder sintering.
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Research context
OpenAlex topics: Advanced materials and composites · Advanced ceramic materials synthesis · Metallic Glasses and Amorphous Alloys
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