Apatite coating on aluminum sheet and method of manufacture
AssigneeAluminum Company of America
InventorsAnthony J. Perrotta, Randall B. Minnick
Life of this patent
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Abstract
A biocompatible coating is formed on an aluminum sheet surface by reacting a surface portion with an aqueous solution containing calcium hydroxide and a more soluble calcium salt to form a hydrocalumite first coating. The first coating is then reacted with a water-soluble phosphate to form a biocompatible coating comprising hydroxyapatite. The hydroxyapatite coating may be reacted with a water-soluble fluoride or fluorophosphate to form a fluorapatite coating.
Claims16
A process for coating an aluminum or aluminum alloy substrate comprising:
- (a) providing an aluminum or aluminum alloy substrate having a surface portion:
- (b) reacting aluminum in said surface portion with a hydrocalumite aqueous solution containing calcium hydroxide and a calcium salt having greater solubility in water than calcium hydroxide, thereby to form a first coating on the substrate;
- and
- (c) reacting said hydrocalumite coating with a water-soluble phosphate to form a hydroxyapatite coating.
A process for coating an aluminum or aluminum alloy substrate comprising:
- (a) providing an aluminum or aluminum alloy substrate having a surface portion;
- (b) reacting aluminum in said surface portion with a water-soluble inorganic phosphate, thereby to form a first coating comprising aluminum phosphate on said substrate;
- and
- (c) reacting said first coating with calcium hydroxide and a calcium salt having greater solubility in water than calcium hydroxide, thereby to form a second coating comprising hydroxyapatite.
A process for coating a metal substrate comprising:
- (a) providing a metal substrate having a surface portion comprising aluminum;
- (b) reacting the aluminum in said surface portion with a first aqueous solution containing calcium hydroxide and a calcium salt having greater solubility in water than calcium hydroxide, thereby to form a first coating comprising hydrocalumite on the substrate;
- and
- (c) reacting said hydrocalumite in the first coating with a water-soluble phosphate, thereby to form a second coating comprising hydroxyapatite on the substrate.
Dependencies are inferred from the claim text.