Transparent glass-ceramic of light brown color and method of mak

Details Transparent glass-ceramic of light brown color and method of mak Transparent glass-ceramic of light brown color and method of mak

1984-02-22

1985-07-02

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Devitrified glass-ceramics

501 7, C03C 322, C03C 304

Patent

active

045268720

ABSTRACT:
The present invention is primarily concerned with the production of transparent glass-ceramic articles especially suitable for use as cooking utensils nucleated with up to 6% TiO.sub.2 and containing up to 0.25% Fe.sub.2 O.sub.3 and, perhaps, up to 0.1% MnO.sub.2, which exhibits a light brown tint that the human eye perceives essentially constant when the dominant wavelength is held between 577-581 nm, purity between 8-15%, and the transmission factor between about 65-80. The desired tint is obtained by including 0.0025-0.02% CoO+Cr.sub.2 O.sub.3, consisting of 0.001-0.01% CoO and 0.001-0.01% Cr.sub.2 O.sub.3, in the base composition of the glass-ceramic. An opaque glass-ceramic article exhibiting a light, warm creamy color perceived by the human eye as essentially constant when the dominant wavelength is held between 570-585 nm, the reflectance factor is in excess of 64, and the purity factor is no greater than 8% can be produced from like base compositions which are crystallized in situ at higher temperatures.

REFERENCES:
patent: 3788865 (1974-01-01), Babcock et al.
patent: 4009042 (1977-02-01), Rittler
patent: 4018612 (1977-04-01), Chyung
patent: 4084974 (1978-04-01), Beall et al.
patent: 4211820 (1980-07-01), Cantaloupe et al.
patent: 4438210 (1984-03-01), Rittler

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