MG法による銅鉛合金組織の微細化について

概要

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Copper-lead alloys are widely used for making sliding bearings. When copper is alloyed with lead, lead acts as a kind of inclusion due to its immiscibility. It is safely presumed, then, that if such inclusions are more finely distributed, the load capacity of bearing materials is increased. In the present study a high-energy type of mechanical alloying method which is recently established for making amorphous alloys was used to give copper-lead alloys an even finer lead distribution. Mechanically ground powders of copper-lead alloy performed for 50hr. in particular shows an evenly distributed fine structure in which the individual lead particles are hardly distinguishable. An X-ray diffraction analysis revealed, however, that the extent of alloying had not reached yet a level that would cause the substitution of copper and lead atoms with each other. Two kind of the sintered materials were made, the one from MG powders and the other from atomized alloyed powders under the same sintering conditions. Comparison between their sintered structures shows that the former structure is finer than the latter one.
社団法人粉体粉末冶金協会の論文