PURPOSE: To provide the process for producing the air permeable durable mold having good dimensional accuracy without generating the crack by segregation of aggregate and the unequalness of the mold surfaces.
CONSTITUTION: A slurry mixture is prepd. by compounding and mixing a hardening auxiliary material 23 which softens and melts in the process of calcination at a weight ratio of 10 and 35 and a binder which contains components to evaporate at 10 to 25, respectively with 100 aggregate formed by compounding metallic powder contg. ≥80% particles of ≤300μm and oxide 21 of the same metal at a ratio of 5:95 to 30:70 by weight. The mold obtd. by pouring such slurry mixture is dried and is further calcined at 600 to 1200°C in an oxidizing atmosphere.
NISHIKAWA KAZUYUKI
HAYASHI YOJIRO
MAKIGUCHI TADASHI
INAGAKI TAKEHIRO
NISHIOKA KOJI
KAWAGUCHI MITSURU
