公开(公告)号：JPS6344929A

公开(公告)日：1988-02-25

申请号：JP18911786

申请日：1986-08-11

Applicant: N R D KK

Inventor： SAWAOKA AKIRA ,  AKASHI TAMOTSU

IPC: B01J3/08 ,  B28B3/00 ,  C04B35/00

Abstract: PURPOSE:To prepare a dense powder molded body, by a method wherein a raw powder becoming non-oxide ceramics by chemicals reaction is mixed with a ceramics powder and the resulting mixture is received in a mold and an impact wave is allowed to act on the powder mixture. CONSTITUTION:A metal powder or a metal/non-metal powder becoming non- oxide ceramics by exothermic chemical reaction is mixed with a ceramic powder in an amount of 10vol% or more. The resulting powder mixture 8 is received in a mold 4 and an impact wave is allowed to act on the powder mixture 8 and a powder molded body with density of 80vol% or more (void ratio 20vol% or less) is formed under high pressure generated at this time and powder particles are activated to obtain a high density ceramic powder molded body. This powder molded body is easily subjected to chemical reaction and sintering, and is facilitated in its sintering in the next sintering process and reduced in shrinkage and the generation of a crack, and becomes homogenous.