Patent ID: 6503445
Filing Date: 2003-01-07
Classification: B22F,C22C

Abstract:
A process for producing an iron-based powder composition having excellent flowability and excellent compactibility for powder metallurgy by fixing an alloying powder onto an iron-based powder by solidifying a molten lubricant, the process comprising:mixing with the iron-based powder and the alloying powder, a lubricant selected from the group consisting of fatty acid amides, metal soaps, thermoplastic resins, thermoplastic elastomers, inorganic materials having a layer crystal structure, and organic materials having a layer crystal structure to obtain a mixture; stirring and heating the mixture up to a temperature higher than the melting point of the lubricant to melt the lubricant; cooling and stirring the mixture after the aforesaid lubricant melting step, and adding a surface treatment agent to the mixture in a temperature range from 100 to 140Â° C., and fixing the alloying powder onto the surface of the iron-based powder by solidifying the molten lubricant to surface treat-fix said mixture; and mixing with the mixture after surface treating-fixing, at least one lubricant selected from the group consisting of; fatty acid amides, metal soaps, thermoplastic resins, thermoplastic elastomers, inorganic materials having a layer crystal structure, and organic materials having a layer crystal structure.