| 摘要 |
A glass article made of a glass, in which the content of a principal alkali metal ion is distinctly higher than the content of any other alkali metal ion optionally contained in the glass, is highly strengthened by first treating the glass article with a source of the principal alkali metal ion to increase only the content of the principal alkali metal ion in each surface layer of the glass article and then at least partially exchanging the principal alkali metal ion in each surface layer of the glass article with another alkali metal ion larger in ionic radius. In the strengthened glass article the total content of alkali metal ions in each surface layer becomes higher than that in the inner region.
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