| 摘要 |
PROBLEM TO BE SOLVED: To provide an iron-based mixed powder for powder metallurgy, which gives a sintered compact improved machinability without deteriorating the mechanical characteristics. SOLUTION: The iron-based mixed powder is a mixture comprising an iron-based powder, a powder for an alloy, a powder for improving machinability and a lubricant. The iron-based powder is an atomized iron powder having a composition comprising 0.04-0.2% S, 0.05-0.5% Mn, or further 0.01-0.1% Si, and the balance Fe with unavoidable impurities, and having a structure in which 5% or more particles by the number out of the total MnS particles are precipitated as oxygen-containing MnS particles. The powder for improving machinability is a calcium phosphate powder and/or a hydroxyapatite powder. A content of the powder for improving the machinability is 0.1 to 2.0 mass% with respect to the total amount of the iron-based powder, the powder for the alloy and the powder for improving the machinability. Thereby, the sintered compact is improved in the machinability. The calcium phosphate powder is preferably formed of one or more phosphates selected from among tricalcium phosphate, calcium monohydrogen phosphate and calcium dihydrogen phosphate. COPYRIGHT: (C)2007,JPO&INPIT
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