| 摘要 |
1,202,260. Ionic refractories. FORD MOTOR CO. Ltd. 21 Nov., 1967 [21 Nov., 1966], No. 52849/67. Heading ClJ. [Also in Division H1] Alumina is mixed with a smaller amount of a Na 2 O/Li 2 O mixture (Na 2 OÀ> Li 2 O) and heated until a first, but terminated before conversion to a second, cationically conductive crystalline form occurs, compressed to the desired shape and size and sintered at a temperature and for a time sufficient to unite the individual crystals but insufficient to convert them to the second form. Specified temperatures are 900-1650‹ C. for crystal formation and 1400-1650‹ C. for sintering. At least 80% Al 2 O 3 is present together with 5-15% Na 2 O and at least 0À1% Li 2 O. |
