Iron oxide 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.
Claims22
An article comprising a three dimensional inorganic substrate other than magnetic or electrically conductive iron oxide having at least one coating containing magnetic or electrically conductive iron oxide on at least a portion of all three dimensions thereof produced by a process 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 a 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 compound to iron oxide;
- contacting said substrate having said iron oxide forming compound 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 an iron oxide coating with 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.
An article comprising a three dimensional inorganic substrate other than magnetic or electrically conductive iron oxide having at least one coating containing magnetic or electrically conductive iron oxide on at least a portion of all three dimensions thereof produced by a process comprising;
- contacting an inorganic three dimensional substrate which includes external surfaces and shielded portions of said substrate with a composition comprising a 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;
- 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 a iron oxide coating on at least a portion of said three dimensions of said substrate including the shielded surfaces of said substrate.
An article comprising a three dimensional inorganic substrate other than magnetic or electrically conductive iron oxide having at least one coating containing magnetic or electrically conductive iron oxide on at least a portion of all three dimensions thereof produced by a process comprising;
- 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;
- 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.
An article comprising a three dimensional inorganic substrate other than an magnetic or electrically conductive iron oxide having a particle type shape and which includes external surfaces and shielded surfaces which are at least partially shielded by other portions of said substrate, said substrate having a coating containing at least one magnetic or electrically conductive interactant associated with the iron oxide coating on at least a portion of said three dimensions of said substrate including the shielded surfaces of said substrate.
Dependencies are inferred from the claim text.