| 摘要 |
There is provided an iron-based powder composition for powder metallurgy excellent in flowability and compactibility. The iron-based powder composition for powder metallurgy is produced in accordance with a method comprising the steps of: adding to iron-based and alloying powders, for a primary mixing, a surface treatment agent, and in addition, for a secondary mixing, a fatty acid amide and at least one lubricant, wherein the lubricant has a melting point higher than that of the fatty acid amide and is selected from the group comprising, a thermoplastic resin, a thermoplastic elastomer, and inorganic or organic compounds having layered crystal structure; heating and stirring up a mixture after the secondary mixing at a temperature over a melting point of the fatty acid amide to melt the fatty acid amide; cooling, while mixing, the mixture subjected to the heating and stirring process so that the alloying powder and a lubricant having a melting point higher than the fatty acid amide adhere to a surface of the iron base powder subjected to the surface treatment by an adhesive force of the melt; and adding at time of the cooling, for a tertiary mixing, a metallic soap and at least one type selected from a group comprising thermoplastic resin or thermoplastic elastomer powders and inorganic or organic compounds having layered crystal structure. The mixture is heated to about 423K and loaded into a die for compaction. |
