| 摘要 |
PURPOSE:To obtain the titled particles suitable for removing burr of mechanical parts, etc., by blending aluminum and iron oxide powder as raw materials in a ratio of three phase coexistence range of corundum phase alumina, alpha phase iron and iron alumina spinel and in specific ratio of iron and alumina and subjecting the blend to solid-phase exothermic reaction. CONSTITUTION:Aluminum and iron oxide powder as raw materials are blended in a ratio capable of forming three phase coexistence range of corundum phase alumina, alphaphase iron and alumina spinel, the amount of iron is >=48wt% and that of Aluminum is >=11wt%, the blend is molded or put in a container having one open end, one end of the molded article or the container is heated in an inert gas atmosphere, a solid- phase exothermic reaction is started, the reaction is propagated successively in a layer state with the reaction heat, the prepared solid reaction product is ground to give the aimed particles which have three phases of corundum phase alumina, alpha phase iron and iron aluminum spinel detected by X-ray diffraction method, and have >=48wt% iron and >=11wt% aluminum and preferably <=44mum particle diameter. EFFECT:Having improve efficiency of magnetic abrasion method and improved economic efficiency. |
