Process for coating a substrate with zinc oxide and uses for coated substrates
First Claim
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1. A process for coating an inorganic three dimensional substrate with doped zinc 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 a zinc oxide-forming compound other than zinc oxide at conditions effective to form a zinc oxide-forming compound containing coating on at least a portion of said substrate;
forming a liquidus zinc 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 dopant forming component at conditions effective to form a dopant 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 zinc oxide forming compound to zinc oxide andcontacting said substrate having said zinc oxide forming compound containing coating and said dopant component-containing coating thereon with an oxidizing agent at conditions effective to convert said zinc oxide forming compound to zinc oxide and form a doped zinc oxide coating on at least a portion of said three dimensions of said substrate including the shielded surfaces of said substrate.
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Abstract
Processes for coating substrates, in particular substrates including shielded surfaces, with zinc oxide-containing coatings are disclosed. Such processes comprise contacting a substrate with a zinc oxide precursor, preferably maintaining the precursor coated substrate at conditions to equilibrate the coating, and then oxidizing the precursor to form a substrate containing zinc oxide. Also disclosed are substrates coated with zinc oxide-containing coatings for use in various applications.
17 Citations
24 Claims
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1. A process for coating an inorganic three dimensional substrate with doped zinc oxide comprising:
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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 a zinc oxide-forming compound other than zinc oxide at conditions effective to form a zinc oxide-forming compound containing coating on at least a portion of said substrate; forming a liquidus zinc 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 dopant forming component at conditions effective to form a dopant 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 zinc oxide forming compound to zinc oxide andcontacting said substrate having said zinc oxide forming compound containing coating and said dopant component-containing coating thereon with an oxidizing agent at conditions effective to convert said zinc oxide forming compound to zinc oxide and form a doped zinc oxide coating on at least a portion of said three dimensions of said substrate including the shielded surfaces of said substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 20, 21, 22)
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9. A process for coating an inorganic three dimensional substrate with zinc oxide comprising:
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contacting an inorganic three dimensional substrate which includes external surfaces and shielded portions of said substrate with a composition comprising a zinc chloride-forming compound at conditions effective to form a zinc chloride-forming compound containing coating on at least a portion of said substrate; forming a liquidus zinc 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 zinc chloride-forming compound;
(2) distribute said zinc chloride-forming compound over said substrate; and
(3) make said zinc chloride-forming compound containing coating more uniform in thickness; andcontacting said substrate with said zinc chloride-forming compound containing coating with an oxidizing agent at conditions effective to convert the zinc chloride forming compound to zinc oxide and form a zinc oxide coating on at least a portion of said three dimensions of said substrate including the shielded surfaces of said substrate. - View Dependent Claims (10, 11, 12, 23)
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13. A process for coating surfaces of an inorganic three dimensional substrate with zinc oxide which comprises:
- contacting an inorganic three dimensional substrate with a composition comprising a zinc oxide precursor powder other than zinc oxide at conditions effective to form a coating containing zinc oxide precursor on at least a portion of the substrate;
forming a liquidus zinc 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 zinc oxide precursor;
(2) distribute said coating containing zinc oxide precursor over said substrate; and
(3) make said coating containing zinc oxide precursor more uniform in thickness; and
contacting said coated substrate with an oxidizing agent at conditions effective to convert said zinc oxide precursor to zinc oxide on at least a portion of said three dimensions of said substrate and form a substrate having a zinc oxide-containing coating. - View Dependent Claims (14, 15, 16, 17, 18, 19, 24)
- contacting an inorganic three dimensional substrate with a composition comprising a zinc oxide precursor powder other than zinc oxide at conditions effective to form a coating containing zinc oxide precursor on at least a portion of the substrate;
Specification