| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an immersion nozzle capable of preventing adhesion of alumina. <P>SOLUTION: The immersion nozzle is preheated by high frequency induction heating. The immersion nozzle contains Al<SB>2</SB>O<SB>3</SB>as a main component, and contains FC (free carbon) and SiO<SB>2</SB>, which satisfy the following two formulae: 0 mass%<M<SB>FC</SB>≤(4/15)M<SB>SiO2</SB>+23 mass%; M<SB>SiO2</SB><25 mass%. By this composition, the amounts of FC and SiO<SB>2</SB>are decreased, so that the adhesion of alumina to the immersion nozzle is prevented. <P>COPYRIGHT: (C)2007,JPO&INPIT |
