IRON-BASED SINTERED ALLOY AND MANUFACTURING METHOD THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide an iron-based sintered alloy superior in strength and toughness, and to provide a manufacturing method therefor. SOLUTION: The iron-based sintered alloy 3 is manufactured by the steps of: pressing a raw powder 1 containing two or more iron powders 10 and 20 having different grain sizes and compositions from the others into a powder compact 2; and heating and sintering the powder compact 2 in an oxidation-preventing atmosphere. The manufacturing method downsizes remaining cavities to increase the strength at the neck part; and optimizes a balance of hardness with ductility in the neck part and the inner part of the particle to provide the iron-based sintered alloy having high strength and toughness. COPYRIGHT: (C)2006,JPO&NCIPI