PRODUCTION OF COMPOSITE SINTERED PARTS

摘要

PURPOSE:To obtain composite sintered mechanical parts wherein a ferrous green compact provided with a boss part and an iron-boron green compact provided with a hole part are formed positively to one body by a power metallurgical method by combining both members and subjecting the combined members to copper infiltering and sintering. CONSTITUTION:A green compact 1 provided with a boss part and a green compact 2 consisting of a compsn. contg. no boron or contg. up to 0.03wt% boron and provided with a hole part are formed separately by consisting of the former essentially of iron and the latter essentially of iron added with >=0.03% boron. Both green compacts 1, 2 are combined and the combined members are subjected to copper infiltering and sintering. The compact 1 is converted to an iron-copper base by the copper infiltering and is expanded by sintering. The compact 2 is converted to iron-copper-boron and is shrank relatively by the sintering. The sintering progresses in the state wherein the joined surfaces of both are tightly adhered. Further both are firmly integrated by the synergistic effect with the joining effect by the copper infiltration. This method is adapted to the production of V-pulleys, etc.