| 摘要 |
PROBLEM TO BE SOLVED: To subject powder metal to press sintering and to mutually joint metallic materials without excessively melting the metallic materials and also only with small characteristic deterioration by interposing metal powder in the space between metallic materials different in kinds and structures and impressing high electric current on the material while a load is applied in the opposite direction. SOLUTION: Works 2 and 3 composed of different metallic materials of aluminum-steel, cast iron-steel or the like are set on the space between a pair of holders 1a and 1b in a discharge sintering joining machine, and they are oppositely held at prescribed intervals via holder jigs 4a and 4b. The space between the works 2 and 3 is filled with metal powder via a sleeve 5. As the metal powder, the metal having a m.p. equal to or below the m.p. of the one lower in that between the different metallic materials, e.g. aluminum powder 6, iron powder or the like is used. Next, the space between the works 2 and 3 is applied with high pressure and high electric current in the opposite direction. As the high electric current, pulse current is preferable. In this way, the powder metal is pressurized and sintered in a short time, and the works 2 and 3 are easily and satisfactorily joined.
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