Mold release coatings for glass forming or processing equipment and related methods
AssigneeCorning Incorporated
InventorsRoy Joseph Bourcier, Benedict Yorke Johnson, Aniello Mario Palumbo
Life of this patent
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Abstract
In one aspect, a pressing unit is provided, comprising: a mold and a plunger, and a coating configured on at least one of: the surface of the mold and/or the surface of the plunger, where the coating is configured adjacent to the areas where molten or hot glass or glass ceramic touches; wherein the coating comprises: a mold release coating, configured as the gob-contacting surface, wherein the mold release coating comprises: at least two solid lubricants selected from tungsten disulfide, boron nitride, glassy carbon and graphite; and a thermal barrier coating comprising barrier material components and an organo-silica binder.
Claims26
A pressing unit, comprising:
- a mold and a plunger, wherein the mold is configured to receive a gob of glass material or glass ceramic material and process the gob into a product form;
- and
- a coating configured on at least one of:
- the surface of the mold which is configured adjacent to the gob and/or product form, to form a coated mold, and
- the surface of the plunger which is configured adjacent to the gob and/or product form, to form a coated plunger,
- wherein the coating comprises:
- a mold release coating, configured as the gob-contacting surface, wherein the mold release coating comprises:
- at least two solid lubricants selected from:
- tungsten disulfide, boron nitride, graphite, and glassy carbon, and
- an organo-silica binder;
- and
- a thermal barrier coating comprising barrier material components and an organo-silica binder, wherein the thermal barrier coating is configured to extend between at least one of:
- the mold release coating and the portion of the coated mold and
- the mold release coating and the portion of the coated plunger.
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A coating, comprising:
- a mold release composition, comprising:
- greater than or equal to 20 wt. % and less than or equal to 70 wt. % boron nitride;
- optionally, greater than or equal to 3 wt. % and less than or equal to 21 wt. % tungsten disulfide;
- optionally, greater than or equal to 4 wt. % and less than or equal to 11 wt. % glassy carbon;
- optionally, less than or equal to 5 wt. % graphite, where at least some graphite is present,
- the remainder, organo-silica solution;
- and
- a thermal barrier coating composition, comprising:
- greater than or equal to 60 wt. % and less than or equal to 85 wt. % of a barrier material component;
- and
- greater than or equal to 15 wt. % and less than or equal to 40 wt. % of a binder comprising an organo-silica solution.
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A method, comprising:
- directing a layer of alcohol-based material onto a plurality of glass-contacting surfaces in a glass or glass-ceramic pressing or glass or glass-ceramic processing assembly, wherein the layer is configured as a thermal barrier layer;
- applying over the thermal barrier layer, a mold release mixture, wherein the mold release mixture comprises:
- an alcohol-based of a mixture including:
- (i) a plurality of solid lubricant components;
- and (ii) an organo-silica binder;
- removing the alcohol from the thermal barrier layer and the mold release to form a dried thermal barrier layer and a dried mold release mixture;
- and
- curing the dried thermal barrier layer and the dried mold release mixture at an elevated temperature for a sufficient duration of time to transform:
- (i) the dried thermal barrier layer into a thermal barrier coating and (ii) the dried mold release mixture into a mold release coating,
- wherein the mold release coating is adhered onto the glass contact surfaces of the glass processing assembly via the thermal barrier coating.
Dependencies are inferred from the claim text.