Process for the production of improved boron coatings
AssigneeSpecialty Materials, Inc.
InventorRaymod J. Suplinskas
Life of this patent
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Abstract
Improved articles of manufacture are disclosed, together with methods for preparing such articles, whereby the surface of a graphite or comparable substrate is first densified with carbon to reduce surface porosity while still retaining sufficient surface texture to enhance the adherence of a subsequently applied boron coating.
Claims27
A method for preparing a boron-coated surface on a porous substrate, said method comprising the steps of:
- (a) immersing a porous substrate in a liquid hydrocarbon;
- (b) while said substrate is immersed in said liquid hydrocarbon, heating the substrate so as to establish a temperature gradient through the substrate whereby at least the interior of the substrate is heated to a temperature above the decomposition temperature of the hydrocarbon while maintaining a lower temperature at the surface of the substrate, for a period sufficient to substantially densify the surface of the substrate to reduce surface porosity;
- and (c) coating the densified substrate surface with boron.
A method for preparing a boron-coated surface on a porous substrate, said method comprising the steps of:
- (a) substantially surrounding a porous substrate with a first gas consisting essentially of a gaseous hydrocarbon;
- (b) while said substrate is surrounded by said first gas, heating the substrate to a temperature above the decomposition temperature of the hydrocarbon for a period sufficient to substantially densify the surface of the substrate to reduce surface porosity;
- and (c) coating the densified substrate surface with boron.
A porous substrate having an adherent, substantially uniform boron-coated surface prepared by the steps of:
- (a) immersing a porous substrate in a liquid hydrocarbon;
- (b) while said substrate is immersed in said liquid hydrocarbon, heating the substrate so as to establish a temperature gradient through the substrate whereby at least the interior of the substrate is heated to a temperature above the decomposition temperature of the hydrocarbon while maintaining a lower temperature at the surface of the substrate, for a period sufficient to substantially densify the surface of the substrate;
- and (c) coating the densified substrate surface with boron.
A porous substrate having an adherent, substantially uniform boron-coated surface prepared by the steps of:
- (a) substantially surrounding a porous substrate with a first gas consisting essentially of a gaseous hydrocarbon;
- (b) while said substrate is surrounded by said first gas, heating the substrate to a temperature above the decomposition temperature of the hydrocarbon for a period sufficient to substantially densify the surface of the substrate;
- and (c) coating the densified substrate surface with boron.
Dependencies are inferred from the claim text.