To produce an improved metal porous body having pore distributing characteristics, mechanical properties or the like and useful as dies, filters, etc.
This metal porous body is composed of a HIP sintered body in which porosity is regulated to 7 to 50% and the pore diameter is regulated to ≤500μm and having a pore distribution in which the pore diameter D5 of 5% cumulative frequency in the integrated distribution curve of the pore diameter, the pore diameter D50 of 50% cumulative frequency and the pore diameter D95 of 95% cumulative frequency satisfy (D95-D5)/D50≤1.5. Metal powder having a certain grain diameter distribution is used as a sintering raw material, and it is produced by the below-mentioned process (A) or (B). (A) Powder is sealed into a capsule, which is subjected to low temp.-low pressure HIP treatment ((temp.: 0.35 to 0.85mpK (mpK denotes the m.p. of the powder; absolute temp.) and pressure: 5 to 150MPa)), and then, this sintered body (temporarily sintered body) is subjected to heat treatment (temp.: 0.6 to 0.95mpK). (B) Powder is subjected to compacting, and the green compact is subjected to HIP treatment (temp.: 0.7 to 0.95mpK and pressure: 5 to 150MPa) without being sealed into a capsule.
FUNAKOSHI ATSUSHI
NISHI TAKASHI
KOSAKA AKIRA
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