Permeable mold.

摘要

A durable and permeable mold for liquid, slurry, soft, sheet or lump materials is characterized by a composite sintered body (1) comprising aggregates of ferrous or non-ferrous metallic grains and ceramic grains, to which a binder contained in evaporating or consumable substance is added. The body (1) has a close hardened surface region or layer (2) in which metallic oxides are scattered. The hardened layer (2) has fine air vents (22) in its thickness. The whole body (1) of the mold has a porosity of 5 to 60% and compression strength of more than 100 kg/cm<2>.