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US 5,290,589 AGranted
Process for coating a substrate with iron oxide and uses for coated substrates
AssigneeEnsci, Inc.
InventorsThomas J. Clough, Victor L. Grosvenor, Naum Pinsky
Life of this patent
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Abstract
Processes for coating substrates, in particular substrates including shielded surfaces, with iron oxide-containing coatings are disclosed. Such processes comprise contacting a substrate with an iron oxide precursor, preferably maintaining the precursor coated substrate at conditions to equilibrate the coating, and then oxidizing the precursor to form a substrate containing iron oxide. Also disclosed are substrates coated with iron oxide-containing coatings for use in various magnetic applications.
Claims27
A process for coating an inorganic three dimensional substrate with iron oxide comprising:
- contacting an inorganic three dimensional substrate which includes external surfaces and shielded surfaces which are at least partially shielded by other portions of said substrate with a composition comprising an iron oxide-forming compound other than iron oxide at conditions effective to form an iron oxide-forming compound containing coating on at least a portion of said substrate;
- forming a liquidus iron oxide forming compound containing coating on at least a portion of the three dimensions of said substrate including the shielded surfaces of said substrate.
- contacting said substrate with at least one additional magnetic or conductivity interacting component at conditions effective to form an additional component-containing coating on at least a portion of said substrate including at least a portion of the three dimensions of said substrate including the shielded surfaces of said substrate;
- said contacting being initiated at least prior to the substantially complete oxidation of said iron oxide forming component to iron oxide;
- and
- contacting said substrate having said iron oxide containing coating and said additional component-containing coating thereon with an oxidizing agent at conditions effective to convert said iron oxide forming compound to iron oxide and form a iron oxide coating with the additional magnetic or conductivity interacting component on at least a portion of said three dimensions of said substrate including the shielded surfaces of said substrate.
3 more elements
A process for coating an inorganic three dimensional substrate with iron oxide comprising:
- contacting an inorganic three dimensional substrate which includes external surfaces and shielded portions of said substrate with a composition comprising an iron-chloride forming compound at conditions effective to form an iron chloride-forming compound containing coating on at least a portion of said substrate;
- forming a liquidus iron chloride-forming compound containing coating on at least a portion of the three dimensions of said substrate including the shielded surfaces of said substrate and at conditions effective to do at least one of the following:
- (1) coat a larger portion of said substrate with said iron chloride-forming compound;
- (2) distribute said iron chloride-forming compound over said substrate;
- and (3) make said iron chloride-forming compound containing coating more uniform in thickness;
- and
- contacting said substrate with said iron chloride-forming compound containing coating with an oxidizing agent at conditions effective to convert the iron chloride forming compound to iron oxide and form an iron oxide coating on at least a portion of said three dimensions of said substrate including the shielded surfaces of said substrate.
4 more elements
A process for coating surfaces of an inorganic three dimensional substrate with iron oxide which comprises:
- contacting an inorganic three dimensional substrate with a composition comprising an iron oxide precursor powder other than iron oxide at conditions effective to form a coating containing iron oxide precursor on at least a portion of the substrate;
- forming a liquidus iron oxide precursor on at least a portion of the three dimensions of said substrate including the shielded surfaces of said substrate and at conditions effective to do at least one of the following:
- (1) coat a larger portion of said substrate with said coating containing iron oxide precursor;
- (2) distribute said coating containing iron oxide precursor over said substrate;
- and (3) make said coating containing iron oxide precursor more uniform in thickness;
- and contacting said coated substrate with an oxidizing agent at conditions effective to convert said iron oxide precursor to iron oxide on at least a portion of said three dimensions of said substrate and form a substrate having an iron oxide-containing coating.
3 more elements
Dependencies are inferred from the claim text.