Glaze for refractory materials
AssigneeCookson Matthey Ceramics & Materials Limited
InventorFraser James Buchanan
Life of this patent
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Abstract
A glaze composition for refractory materials includes 30 to 80% by weight of at least one lead-free and barium-free borosilicate, borophosphate or phosphate glass frit having a dilatometric softening point of below 600.degree. C.; 2 to 30% by weight of aluminium powder or an aluminium alloy powder; 2 to 30% by weight of silicon powder or silicon alloy powder, up to 10% by weight of an inhibitor; and optionally a refractory filler, a clay or other additives. The glaze composition is of particular use as a glaze for carbon containing refractory materials such as submerged entry nozzles and graphite electrodes.
Claims25
A method of protecting an article made of a refractory material, which method comprises (a) providing a glaze slip composition which consists essentially of:
- ______________________________________ % By Weight ______________________________________ at least one lead free and barium free 30 to 80 borosilicate, borophosphate or phosphate glass frit having a dilatometric softening point of below 600.degree. C. aluminium powder or an aluminium 2 to 30 alloy powder silicon powder or silicon alloy powder 2 to 30 inhibitor up to 10 refractory filler 0 to 20 clay 0 to 20 ______________________________________
- and (b) coating said glaze slip composition onto a surface of said refractory article.
An article of manufacture which comprises a refractory body covered at least in part by a coating formed from a glaze slip composition consisting essentially of:
- ______________________________________ % By Weight ______________________________________ at least one lead free and barium free 30 to 80 borosilicate, borophosphate or phosphate glass frit having a dilatometric softening point of below 600.degree. C. aluminium powder or an aluminium 2 to 30 alloy powder silicon powder or silicon alloy powder 2 to 30 inhibitor up to 10 refractory filler 0 to 20 clay 0 to 20 ______________________________________
- said body being a submerged entry nozzle, a submerged entry shroud, a ladle shroud, or a stopper rod.
Dependencies are inferred from the claim text.