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US 3,939,295 AGranted
Protective coatings and frits therefor
AssigneeRadiation Limited
InventorsRobert Robertson, Reginald Arthur Read
Life of this patent
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Abstract
A process for coating a surface with a glass ceramic coating incorporating a catalyst, the process consisting of formulating glass ceramic frit to produce vitrification at low temperatures thereby providing a porous glass ceramic coating to act as a carrier for the catalyst. The catalyst may be one able to bring about oxidation of contamination produced by cooking food.
Claims11
A process for providing a surface with a catalytically-active glass ceramic coating comprising the steps of
- i. producing a glass ceramic frit having a formulation lying within the ranges SiO.sub.2 30- 70% by weight:
- Al.sub.2 O.sub.3 0-25% by weight:
- LiO.sub.2 and/or Na.sub.2 O and/or K.sub.2 O (in total) 0-30% by weight:
- CaO and/or SrO and/or BaO and/or MgO (in total) 10-40% by weight:
- ZnO 0-10% by weight:
- and B.sub.2 O.sub.3 0-20% by weight,
- ii. milling the frit to a fineness of from 2-20 grams on a 200 mesh sieve (50 ml. sample),
- iii. preparing a slurry from the frit,
- iv. incorporating a catalyst in the slurry,
- v. coating the surface with the slurry and drying the same, and,
- vi. firing the surface with the dried slurry at a temperature within the range of from 650.degree.-950.degree.C to produce a fully-fired glass ceramic coating with a porosity in excess of about 20%.
8 more elements
Dependencies are inferred from the claim text.