Molten metal casting die
AssigneeNonferrous Materials Technology Development Centre
InventorsKrishnamurty Balasubramanian, Radha Madhab Mohanty
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Abstract
A molten metal casting die having a modified surface, a method for making such dies, and a method for making articles of manufacture from such dies is disclosed. The methods are designed to protect die steel surfaces having a protective coating from corrosion by molten metals substantially containing liquid copper.
Claims6
A method for protecting the surface of a die useful for casting of copper articles, comprising providing a steel die and applying a protective coating to a surface of the die which coating is to be in contact with molten copper, wherein the protective coating comprises a transitional layer comprising Al2O3 in contact with the steel die;
- a second layer comprising MoSi2+Al2O3 in contact with the transitional layer;
- and a third layer comprising NiCr—Cr3C2 in contact with the second layer.
A die for casting copper articles, comprising
- a die substrate comprised of a steel surface;
- and
- a protective coating comprising a transitional layer comprising Al2O3 in contact with the steel surface;
- a second layer comprising MoSi2+Al2O3 in contact with the transitional layer;
- and a third layer comprising NiCr—Cr3C2 in contact with the second layer;
- wherein the coating is adapted to contact molten copper when casting a copper article in the die.
Dependencies are inferred from the claim text.