A porous mold material for casting and a method of producing the same

摘要

A porous mold material is provided that contains pores for ventilation in a metal casting, which pores range from 20 to 50 microns, and wherein the porosity value of the porous mold material ranges from 25 to 35% by volume. A method is further provided of producing a porous mold material that contains pores ranging from 20 to 50 microns for ventilation in casting, which method is characterized in that the mixing ratio of stainless steel particles to stainless steel short fibers is from 40wt%:60wt% to 65wt%:35wt%. The porous mold material of this invention does not have defects such as the inferior fluidity of a molten metal in the mold, or the shrinkage and blowholes in cast products.