Compositions: coating or plastic – Coating or plastic compositions – Metal-depositing composition or substrate-sensitizing...
Patent
1980-05-05
1981-03-31
Vertiz, O. R.
Compositions: coating or plastic
Coating or plastic compositions
Metal-depositing composition or substrate-sensitizing...
C03C 308
Patent
active
042591180
ABSTRACT:
Glass compositions have been found which, with a low linear thermal expansion coefficient of 33.9-53.2.times.10.sup.-7 /.degree.C. at 20-300.degree. C. will pre-stress to a much higher extent under similar prestressing conditions than known glasses of the same thermal expansion, and which consequently result in crumbling under forced fracture. The glasses possess the following properties: the transformation temperatures (Tg) are between 566.degree. and 660.degree. C., the softening temperatures (Ew) are between 821.degree. and 845.degree. C. and working temperatures are between 1211.degree. and 1370.degree. C., the temperature differential Ew-Tg being 232.degree. to 298.degree. C., the ratio .alpha.'/.alpha. of the thermal expansion coefficient above Tg (.alpha.') to expansion below Tg (.alpha.) being between 4.1 and 9.4 and the formation comprising:
REFERENCES:
patent: 2068801 (1957-01-01), Hood
patent: 3326703 (1967-06-01), Harrington
patent: 3784387 (1974-01-01), Sack
patent: 3984252 (1976-10-01), Kiefer
patent: 4001741 (1977-01-01), Lindig et al.
Bell Mark
Jenaer Glaswerk Schott & Gen.
Vertiz O. R.
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