Glass-ceramic coatings for use on metal substrates
AssigneeCorning Glass Works
InventorsRonald L. Andrus, Kenneth Chyung, Richard F. Reade, deceased, by Clara M. Reade, administratrix
Life of this patent
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Abstract
The present invention is directed to the production of glass-ceramic coatings capable of being fired repeatedly to temperatures in excess of 950.degree. C. without thermal deformation and being especially suitable for application to titanium-stabilized stainless steels. The coatings are highly crystalline, substantially free from alkali metal oxides, and consist essentially, by weight, of: ______________________________________ MgO 5-35 CaO 0-35 ZnO 0-25 CaO + ZnO 10-35 Al.sub.2 O.sub.3 0-10 B.sub.2 O.sub.3 0-25 P.sub.2 O.sub.5 0-10 B.sub.2 O.sub.3 + P.sub.2 O.sub.5 4-25 SiO.sub.2 25-50 ______________________________________
Claims3
Glass-ceramic coating compositions capable of being fired repeatedly to temperatures greater than 950.degree. C. without undergoing thermal deformation, exhibiting coefficients of thermal expansion (25.degree.-600.degree. C.) between about 80-125.times.10.sup.-7 /.degree. C., and being substantially free from alkali metal oxides consisting essentially, expressed in terms of weight percent on the oxide basis, of:
- ______________________________________ MgO 5-35 CaO 0-35 ZnO 0-25 CaO + ZnO 10-35 Al.sub.2 O.sub.3 0-10 B.sub.2 O.sub.3 0-25 P.sub.2 O.sub.5 0-10 B.sub.2 O.sub.3 + P.sub.2 O.sub.5 4-25 SiO.sub.2 25-50 ______________________________________
Dependencies are inferred from the claim text.