A method for reducing surface roughness of an article includes contacting a surface of an article with a molten metal agent, the surface having an initial roughness; altering at least a portion of the surface in the molten metal agent; and removing the surface from contact with the agent; wherein, a
A method for reducing surface roughness of an article includes contacting a surface of an article with a molten metal agent, the surface having an initial roughness; altering at least a portion of the surface in the molten metal agent; and removing the surface from contact with the agent; wherein, after the removing step, the surface has a processed roughness that is less than the initial roughness.
대표청구항▼
1. A method for reducing surface roughness comprising: providing an article having a surface having an initial roughness;providing a molten metal agent suitable for dissolving the surface and/or material on the surface produced by reaction of the agent with the surface;thereafter contacting at least
1. A method for reducing surface roughness comprising: providing an article having a surface having an initial roughness;providing a molten metal agent suitable for dissolving the surface and/or material on the surface produced by reaction of the agent with the surface;thereafter contacting at least a portion of the surface with the molten metal agent for a time sufficient to dissolve the portion of the surface and/or material on the surface produced by reaction of the agent with the surface in contact with the molten metal agent to form a coated surface; wherein the coated surface has a processed roughness that is less than the initial roughness. 2. The method of claim 1, wherein at least a portion of the article, said portion including said surface, comprises additively manufactured material. 3. The method of claim 1, wherein contacting further comprises introducing the agent into an internal channel disposed within the article, and wherein the surface comprises a wall of the internal channel. 4. The method of claim 1, wherein the article is a component of a turbine assembly. 5. The method of claim 1, wherein contacting is performed in an inert atmosphere. 6. The method of claim 1, wherein the initial roughness is an arithmetic average roughness (Ra) of at least about 5 micrometers. 7. The method of claim 1, wherein the surface comprises a metal. 8. The method of claim 1, wherein the surface comprises cobalt, iron, nickel, aluminum, titanium, or combinations that include one or more of the aforementioned. 9. The method of claim 1, wherein the surface comprises an alloy comprising cobalt and chromium. 10. The method of claim 9, wherein the alloy comprises from about 26 weight percent to about 30 weight percent chromium, and from about 4 weight percent to about 7 weight percent molybdenum. 11. The method of claim 1, wherein the molten metal agent comprises aluminum, bismuth, tin, or combinations that include one or more of the aforementioned. 12. The method of claim 1, wherein the molten metal agent has a melting point below about 1000 degrees Celsius. 13. The method of claim 1, wherein the molten metal agent comprises aluminum and silicon. 14. The method of claim 1, wherein the molten metal agent comprises aluminum and up to about 14 weight percent silicon. 15. The method of claim 1, wherein the molten metal agent is at a temperature in a range from about 500 degrees Celsius to about 1000 degrees Celsius. 16. The method of claim 1, wherein the molten metal agent comprises a primary metal element and a melting point depressant, wherein the melting point depressant reduces the melting point of the primary metal element from its nominal melting point. 17. The method of claim 16, wherein the melting point depressant comprises boron, silicon lithium, or combinations that include one or more of the aforementioned. 18. The method of claim 1, wherein contacting comprises flowing the agent over the surface. 19. The method of claim 1, wherein contacting comprises dipping the article into the agent. 20. The method of claim 1, wherein the processed roughness is less than about 95% of the initial roughness. 21. The method of claim 1 further comprising mechanically removing a solidified product of the agent from the surface of the article. 22. The method of claim 1 further comprising chemically removing a solidified product of the agent from the surface of the article. 23. The method of claim 1, further comprising pretreating the surface of the article with a surface enhancement aid prior to contact with the molten metal agent wherein the surface enhancement aid increases wetting between the surface and the molten metal agent and/or increases the solubility of surface material in the molten metal agent. 24. The method of claim 1, further comprising forming at least a portion of the article by a process that includes an additive manufacturing step, wherein the portion includes said surface. 25. The method of claim 1, wherein contacting is performed at a pressure below atmospheric pressure. 26. The method of claim 1, wherein the molten metal agent reacts with the surface. 27. A method for reducing surface roughness comprising: providing an article having a surface having an initial roughness;providing a molten metal agent suitable for dissolving the surface and/or material on the surface produced by reaction of the agent with the surface;thereafter contacting at least a portion of the surface with the molten metal agent for a time sufficient to dissolve the portion of the surface and/or material on the surface in contact with the molten metal agent to form a coated surface; wherein the metal article comprises cobalt and chromium, and the agent comprises aluminum; and the coated surface has a processed roughness that is less than about 95% of the initial roughness.
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