Miba Sintermetall Aktiengesellschaft

Osman Z Zengin

A process of manufacturing a member formed with a shaft-receiving opening in that a compact formed with a through hole and comprising a sinterable powder is subjected to liquid-phase sintering is improved in that a bushing, which is made of a material produced by fusion metallurgy and is dimensionally stable under the conditions under which the compact is to be sintered, is inserted into the through opening of the compact with a play which is smaller than the extent of the unrestrained radial shrinkage of the compact at its through opening during its liquid-phase sintering, and the compact is subjected to liquid-phase sintering after the bushing has thus been inserted.

Process of manufacturing a member having a shaft-receiving opening

To permit an economical manufacture of high-strength sintered members for use in valve timing mechanisms of internal combustion engine by powder metallurgy with liquid-phase sintering, an iron-base powder mixture is provided, which contains 13 to 18% by weight chromium or 3 to 6% by weight molybdenum as a carbide-forming alloying element in the iron alloy powder and also contains 1.5 to 2.6% carbon and 0.4 to 1.0% by weight phosphorus. A corresponding molten iron alloy is atomized into an entraining gas or water jet and is subsequently mixed with the remaining components of the powder.

Growing community of inventors

Gmunden, Austria

Osman Z Zengin