| 摘要 |
<p>A lithium aluminosilicate glass body encased within, and integral with, a thin compressive, semicrystalline layer containing beta-eucryptite and/or beta-quartz solid solution crystals, and a method of producing such body. The layer has a substantially lower thermal coefficient of expansion than the glass, but has the same chemical composition as the glass. That composition, in percent by weight on a calculated oxide bases is 55-67% SiO2, 5.0-7.5% Li2O, 22-28% Al2O3, 0-2% Na2O and 0-10% ZnO, the molar ratio of R2O+RO to Al2O3 being greater than one. A controlled crystallization procedure is described by which the crystallized layer can be produced in a relatively short time.</p> |
