PRODUCTION OF IRON-SILICON SOFT MAGNETIC SINTERED ALLOY

摘要

PURPOSE: To provide the magnetic alloy with improved fluldability during the forming, and with the excellent magnetic characteristic by adding kneading and the prescribed binder to the fine powder of Fe-Si alloy, and forming it after the granulation, formation and degreasing. ;CONSTITUTION: The binder consisting of, by weight, 0.1-2.0% polyvinyl alcohol, methyl-cellulose, and polyacrylamide in a single or composite manner and water is added to the fine powder of Fe-Si alloy, and kneaded and stirred to make the slurry of 20-50% in water content. This slurry is granulated to 20-400μm in the mean grain size by using a spray dryer device. Formation is made by using this granulated powder, and degreasing is achieved in the gaseous hydrogen flow to allow the sintering in vacuum or in the inert gas. The amount of the residual oxygen and carbon in the sintered body is reduced, the fluidability and lubricability of the powder during the formation is improved to improve the dimensional precision of the formed body and the productivity.;COPYRIGHT: (C)1996,JPO