Methods of forming hardened surfaces
AssigneeBechtel BWXT Idaho, LLC
InventorDaniel J. Branagan
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Abstract
The invention encompasses a method of forming a metallic coating. A metallic glass coating is formed over a metallic substrate. After formation of the coating, at least a portion of the metallic glass can be converted into a crystalline material having a nanocrystalline grain size. The invention also encompasses metallic coatings comprising metallic glass. Additionally, the invention encompasses metallic coatings comprising crystalline metallic material, with at least some of the crystalline metallic material having a nanocrystalline grain size.
Claims69
A method of forming a hardened surface on a substrate, comprising:
- providing a substrate;
- and
- forming a molten alloy and cooling said alloy to form a metallic glass coating on the substrate, the forming comprising forming a successive buildup of metallic glass layers, the metallic glass coating having a hardness of at least about 9.2 GPa, and comprising an alloy containing fewer than 11 elements and wherein said alloy contains one or both of molybdenum and tungsten.
A method of forming a hardened surface on a substrate, comprising:
- providing a substrate;
- forming a molten alloy and cooling said alloy to form a metallic glass coating on the substrate and having a first hardness of at least about 9.2 GPa, the metallic glass comprising fewer than 11 elements;
- and converting at least a portion of the metallic glass coating to a crystalline material having a nanocrystalline grain size and a second hardness of at least about 9.2 GPa.
A method of forming a hardened surface on a substrate, comprising:
- providing a substrate;
- forming a molten alloy and cooling said alloy to form a metallic glass coating on the substrate;
- the forming comprising a successive build-up of metallic glass layers, the metallic glass comprising one or more materials selected from the group consisting of (Fe0.85Cr0.15)83B17, (Fe0.8Cr0.2)83B17, (Fe0.75Cr0.25)83B17, (Fe0.6Co0.2Cr0.2)83B17, (Fe0.8Cr0.15Mo0.05)83B17, (Fe0.8Cr0.2)79B17C4, (Fe0.8Cr0.2)79B17Si4, (Fe0.8Cr0.2)79B17Al4, (Fe0.8Cr0.2)75B17Al4C4, (Fe0.8Cr0.2)75B17Si4C4, (Fe0.8Cr0.2)75B17Si4Al4, (Fe0.8Cr0.2)71B17Si4C4Al4, (Fe0.7Co0.1Cr0.2)83B17, (Fe0.8Cr0.2)80B20, (Fe0.8Cr0.2)76B17Al7, (Fe0.8Cr0.2)79B17W2C2, (Fe0.8Cr0.2)81B17W2, and Fe64Ti3Cr5Mo2B16C5Si1Al2La2;
- the metallic glass coating having a hardness of at least about 9.2 GPa and
- converting at least a portion of the metallic glass coating to a crystalline material having a nanocrystalline grain size.
Dependencies are inferred from the claim text.