MANUFACTURING METHOD OF CHROMIUM FOR POWDER METALLURGY

摘要

PROBLEM TO BE SOLVED: To provide a manufacturing method of chromium for powder metallurgy capable of preventing the strength of a product after sintering manufactured by powder metallurgy from being deteriorated.SOLUTION: Chromium-containing metal is pulverized by an impact type pulverization mill and powder of the pulverized chromium-containing metal is used as raw material of powder metallurgy. The impact type pulverization mill is a pulverization machine which applies an impact to crude particles by means of a pin or hammer which is rotated at a high speed to crush the crude particles. As the impact type pulverization mill, a pin mill provided with a pin on a disc rotated at a high speed or a hammer mill provided with a hammer on a rotor rotated at a high speed can be used.