Surface modification of powders by the high speed impact treatment method.

Abstract

This study deals with the mechanochemical powder surface modification method. This method is a high speed impact treatment method utilizing order mixing. In the method, fine particles are first made to adhere to the surface of a core particle by static electricity, and then the surface interaction between particles is strengthened by applying physical force.Nylon 12 powder as core particles was mixed with fine particles, such as poly-methyl-methacrylate (PMMA) and titanium dioxide as wall materials.In the PMMA/nylon 12 system, it is found by SEM observation that many fine PMMA particles are softened and melted coating each core nylon 12 particle. On the other hand, in the titanium dioxide/nylon 12 system, from the results observed by liquid penetrating a composite powder bed, contact angle measurement, X-ray analysis, and SEM observation, it is mainly found that titanium dioxide particles are homogeneously fixed onto the surface of each core particle.