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US 5,476,679 AGranted
Method for making a graphite component covered with a layer of glassy carbon
AssigneeUCAR Carbon Technology Corporation
InventorsIrwin C. Lewis, Terrence A. Pirro, Douglas J. Miller
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Abstract
Method for making a component, graphite component, such as a graphite crucible, for use in the production of silicon crystal growth from molten silicon wherein the graphite component has an outer coated layer of glassy carbon formed from a thermoset organic resin that prevents contamination of the molten silicon by carbon from the graphite component.
Claims1
A method for making a graphite component having a coating of a completely covering layer of glassy carbon consisting of the following steps:
- (a) preparing a graphite component in the form of a crucible for use in the making of single silicon crystal growth from a molten silicon bath contained in the crucible;
- (b) immersing said crucible in a liquid non-graphitizing organic thermosetting resin and removing said crucible from said resin thereby depositing on said component a completely covering layer of a non-graphitizing organic thermosetting resin from about 0.5 to 25 mils thick;
- and
- (c) heating the component and its deposited liquid resin layer at a temperature and time period sufficient to thermoset the resin layer and further heating the component and its thermoset resin layer in an inert atmosphere or a halogen-containing atmosphere to convert the thermoset resin layer to a glassy carbon non-graphitic coating completely covering said crucible.
1 more element
Dependencies are inferred from the claim text.