| 摘要 |
PROBLEM TO BE SOLVED: To provide an Li<SB>2</SB>O-Al<SB>2</SB>O<SB>3</SB>-SiO<SB>2</SB>-based crystallized glass being excellent in heat resistance and thermal shock resistance, and less prone to devitrification during molding. SOLUTION: This crystallized glass comprises, by mass%, 55-66% SiO<SB>2</SB>, 20-30% Al<SB>2</SB>O<SB>3</SB>, 3.1-7% Li<SB>2</SB>O, 1-5% TiO<SB>2</SB>, 0.5-3% ZrO<SB>2</SB>, 0.5-5% P<SB>2</SB>O<SB>5</SB>, 0.1-2.4% B<SB>2</SB>O<SB>3</SB>and 0.3-5% Na<SB>2</SB>O+K<SB>2</SB>O, and 0.1-3% BaO, wherein P<SB>2</SB>O<SB>5</SB>/B<SB>2</SB>O<SB>3</SB>is larger than 1.2; has a glass transition point of 620°C or above; and exhibits a working temperature range (the difference between the molding temperature and the liquid phase temperature) of raw glass before crystallization is 80°C or above. COPYRIGHT: (C)2007,JPO&INPIT
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