| 摘要 |
PROBLEM TO BE SOLVED: To obtain a high-density sintered article which has not been obtainable by the conventional powder metallurgical method by adding borax, etc., to fine metal powder and carrying out granulation, adding the resultant granulated powder to metal powder used in the ordinary powder metallurgical method to form a powder mixture, pressing the powder mixture into green compacts and sintering the resultant green compacts. SOLUTION: Borax, etc., are added to fine metal powder for the purpose of improving sinterability and they are granulated to 30-120μm particle size. The resultant granulated powder is added to metal powder with a particle size, e.g. of 50-100μm used in the ordinary powder metallurgical method. The resultant powder mixture is pressed into green compacts, and this green compacts are sintered. By this method, the high-density sintered article so far impossible to obtain by the conventional powder metallurgical method can be obtained.
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