Compositions: coating or plastic – Coating or plastic compositions – Marking
Patent
1975-07-18
1977-06-07
McCarthy, Helen M.
Compositions: coating or plastic
Coating or plastic compositions
Marking
65 33, 106 53, 252518, C03C 322
Patent
active
040281213
ABSTRACT:
This invention is directed to the production of glass-ceramic bodies having compositions within the PbO-Al.sub.2 O.sub.3 -SiO.sub.2 field nucleated with TiO.sub.2, wherein the principal crystal phase is a lead feldspar solid solution. Such articles can have use temperatures up to 1250.degree. C. and exhibit very high electrical resistivities, with very low loss tangents, and relatively low coefficients of thermal expansion (less than about 35 .times. 10.sup.-.sup.7 /.degree. C. over the temperature range of 25.degree.-300.degree. C.) such as to recommend their use as stovetops for electric ranges. More particularly, this invention relates to glass-ceramic bodies having compositions consisting essentially, by weight on the oxide basis, of about 26-45% PbO, 12-28% Al.sub.2 O.sub.3, 30-50% SiO.sub.2, and at least 3% but less than 6% TiO.sub.2 as a nucleating agent.
REFERENCES:
patent: 3084053 (1963-04-01), Arlett et al.
patent: 3586522 (1971-06-01), Hoffman
patent: 3700741 (1972-10-01), Duke
patent: 3883337 (1975-05-01), Helgesson
patent: 3940255 (1976-02-01), Harrington et al.
patent: 3950174 (1976-04-01), Suzuki et al.
Corning Glass Works
Janes Jr. Clinton S.
McCarthy Helen M.
Patty, Jr. Clarence R.
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