| 摘要 |
<P>PROBLEM TO BE SOLVED: To manufacture a 12CaO 7Al<SB>2</SB>O<SB>3</SB>polycrystalline substance having higher electrical conductivity with high productivity. <P>SOLUTION: A 12CaO 7Al<SB>2</SB>O<SB>3</SB>powder is arranged in a carbon crucible wherein carbon sheets are sheeted, a carbon lid is put on the opening of the crucible, the crucible with the lid is introduced into a melting furnace. 12CaO 7Al<SB>2</SB>O<SB>3</SB>polycrystalline substance having higher electrical conductivity can be manufactured by melting the powder in the crucible in a dried nitrogen atmosphere, cooling and solidifying. In the present method, a melting and solidifying treatment is required only once, while a conventional method has required twice-repeated such treatments, and the resultant solid does not stick to the crucible. <P>COPYRIGHT: (C)2008,JPO&INPIT |
