| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide techniques of obtaining a reinforced glass having high mechanical strength and superior formability by achieving both of ion exchange performance and devitrification resistance of the glass and increasing the thickness of a compressive stress layer although the ion exchange process is carried out in a short time. <P>SOLUTION: The reinforced glass of the present invention has a compressive stress layer on the surface. This reinforced glass is characterized by containing, in mol%, 40 to 80% of SiO<SB>2</SB>, 5 to 15% of Al<SB>2</SB>O<SB>3</SB>, 0 to 8% of B<SB>2</SB>O<SB>3</SB>, 0 to 10% of Li<SB>2</SB>O, 5 to 20% of Na<SB>2</SB>O, 0.5 to 20% of K<SB>2</SB>O and 0 to 10% of MgO, with 8 to 16.5% of Al<SB>2</SB>O<SB>3</SB>+MgO, and 1.4 to 3 in the molar ratio of (L2+Na<SB>2</SB>O+K<SB>2</SB>O)/Al<SB>2</SB>O<SB>3</SB>, 1 to 3 of Na<SB>2</SB>O/Al<SB>2</SB>O<SB>3</SB>and 0 to 1 of MgO/Al<SB>2</SB>O<SB>3</SB>. The reinforced glass is further characterized in that it does not substantially contain As<SB>2</SB>O<SB>3</SB>, PbO and F. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
