公开(公告)号：EP0379576A4

公开(公告)日：1991-04-24

申请号：EP88902219

申请日：1988-02-26

申请人： INAX CORPORATION

发明人： MURAGUCHI, YUKITO ,  TAKAHASCHI, HIROAKI

IPC分类号： B28B1/26 ,  C04B35/18 ,  C04B35/195 ,  C04B38/00

CPC分类号： C04B38/0054 ,  B01D71/027 ,  B28B1/262 ,  B28B1/265 ,  C04B33/025 ,  C04B33/28 ,  C04B33/32 ,  C04B35/195 ,  C04B35/6261 ,  C04B2111/00267 ,  C04B2111/00793 ,  C04B2111/00939 ,  C04B2235/3208 ,  C04B2235/3418 ,  C04B2235/3454 ,  C04B2235/3463 ,  C04B2235/3481 ,  C04B2235/349 ,  C04B2235/5472 ,  C04B2235/6027 ,  C04B2235/606 ,  C04B2235/616 ,  C04B2235/656 ,  C04B2235/6562 ,  C04B2235/6565 ,  C04B2235/6567 ,  C04B2235/80 ,  C04B35/18

摘要： This invention relates to a gas-permeable porous body and production thereof by blending siliceous pagodite, limestone and clay in such a manner that SiO2 accounts for 70 to 88 wt.%, CaO 5 to 23 wt.% and Al2O3 5 to 15 wt.%, molding the mixture and sintering the mold at 1,000°C or above. This porous body has an extremely uniform pore diameter and high gas-permeability and is used for a filter or an aeration member or for a mold for pressure casting. This invention relates also to a pressure casting mold having drain paths (5, 5') which are formed near the boundary surfaces between surface layers (50) and support layers (60). The surface layer (50) is made of the gas-permeable porous body described above. This mold makes it possible to release smoothly a thickened portion.