| 摘要 |
1518475 Porous cordierite ceramic NIPPON GAISHI KK 18 March 1977 [28 Dec 1976] 11559/77 Heading CIJ A ceramic comprising cordierite in the crystal phase after being fired and having a mean pore size of 2-50 microns and a thermal expansion coefficient of not more than 16 Î 10<SP>-7</SP> (1/‹C) over the range 25-1000‹C is produced from a batch including a magnesia raw material with an average particle size of 5-150 microns. The magnesia raw material may be one of talc, calcined talc, magnesite, calcined magnesite, brucite, or magnesium carbonate, hydroxide or oxide. The cordierite ceramic consists of 42-52 weight per cent SiO 2 , 34-48 weight per cent Al 2 O 3 and 10-18 weight per cent MgO and it may contain not more than 35 weight per cent of spinel, sapphirine, mullite or corundum. |
