| 摘要 |
1312145 Glass laminate CORNING GLASS WORKS 7 July 1970 [9 July 1969] 32792/70 Heading C1M A laminated glass article is formed from a plurality of fused adjacent laminµ, wherein each outer lamina has a lower coefficient of expansion than an inner lamina adjacent thereto, and wherein successive laminµ alternately have higher and lower coefficients of expansion, the article having a compressively stressed outer zone and a tensilely stressed inner zone, the outer zone consisting of an outer sub-zone of maximum compressive stress and an inner sub-zone in which the compressive stress changes in value to a point of transition from compressive to tensile stress. The article, which may be table-ware, is produced by providing a multi-ply laminated glass article having a compressively stressed surface ply and at least one tensilely stressed inner ply and wherein each ply exhibits a state of stress opposite to that of adjacent plies, and subjecting the article to a thermal tempering step, for which quenching air or molten salt or oil baths are suggested. Numerous examples are given of suitable glasses including spontaneous opal glasses or opal glassceramics. Preferably the glass forming the outer layers having a coefficient of expansion between 30 to 80 Î 10<SP>-7</SP>/‹ C. and the alternate layers an expansion coefficient of between 60 and 110 x 10<SP>-7</SP>/‹ C. Specifications 1,264,414 and 1,264,411 are referred to. |
