Preparation of Composite Particles with Multicomponent Dispersed Layer by Two Step Mechanofusion Processed

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Composite particles with a double layer and with a multi-component dispersed layer were prepared in order to improve the mechanical characteristics of metal/ceramics sintered materials. Since the coating particles do not segregate from the core particles during processing, composite particle technology can be applied to sintered and spraying materials.Composite particles with double layer or with matrix type were prepared by two step mechanofusion process.Stainless particles of mean particle diameter in 35um were used as core materials. Zirconia particles(0.3um) were used for primary coating of core particles in the first mechanofusion process. Electrolitic Cu particles, spherical stainless(5um) and flaky stainless(15um) were used for secondary coating in the next mechanofusion process.1). Secondary composite particles with a double layer were obtained by coating the consolidated layer primary composite particles with copper particles which easily submit to plastic deformation.2). When primary composite particles with a consolidated layer were submitted to the mechanofusion with spherical stainless steel particles, the primary zirconia layer peeled off. These peeled particles then temporarily coated the fine stainless steel particles, although stable secondary composite particles could not be obtained.3). When primary composite particles with a agglomerated layer were submitted to the mechanofusion with flaky stainless steel particles, zirconia agglomeration of the primary layer adhered to the flaky stainless steel particles. These composite agglomerations then adhered to the core particles again, producing composite particles with a multi-component dispersed layer.