US2025333822A1PendingUtilityA1

Niobium-Cobalt Intermetallic Alloy Useful for High Temperature Applications

Assignee: JONES L E COPriority: Mar 31, 2023Filed: Feb 1, 2024Published: Oct 30, 2025

Est. expiryMar 31, 2043(~16.7 yrs left)· nominal 20-yr term from priority

Inventors:Cong Yue Qiao David Doll

C22C 30/00C22C 19/07

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Claims

Abstract

A cobalt-niobium intermetallic alloy comprising, in weight percent, 35 to 80 wt. % Co, 10 to 45 wt. %, Nb, a total of at least 70 wt. % Co plus Nb, a total of 5 to 30% Cr, Fe, Ni and Si with up to 10 wt. % Cr, up to 10 wt. % Fe, up to 12 wt. % Ni and up to 3 wt. % Si, balance up to 1.5 wt. % total other elements including up to 0.25 wt. % C, up to 0.1 wt. % Mn, up to 0.2 wt. % Mo, up to 0.1 wt. % P, up to 0.1 wt. % S, up to 0.15 wt. % N, up to 0.1 wt. % V, up to 0.1 wt. % Ti, up to 0.1 wt. % Al, up to 0.1 wt. % Hf, up to 0.1 wt. % Zr, up to 0.1 wt. % Ta, up to 0.1 wt. % W and up to 0.05 wt. % B. The alloy can have a cast structure in which an intradendritic region includes Nb 6 Co 7 and/or NbCo 2 intermetallic phases and/or a cast structure in which an interdendritic region includes a mixture of Nb 6 Co 7 and NbCo 2 intermetallic phases.

Claims

exact text as granted — not AI-modified

What is claimed is: 
     
         1 . A cobalt-niobium intermetallic alloy comprising, in weight percent, 35 to 80 wt. % Co, 10 to 45 wt. %, Nb, a total of at least 70 wt. % Co plus Nb, a total of 5 to 30 wt. % Cr, Fe, Ni and Si with up to 10 wt. % Cr, up to 10 wt. % Fe, up to 12 wt. % Ni and up to 3 wt. % Si, balance up to 1.5 wt. % total other elements. 
     
     
         2 . The cobalt-niobium intermetallic alloy of  claim 1 , wherein the alloy includes at least 5 wt. % Cr, at least 0.1 wt. % Fe, at least 0.01 wt. % Ni and/or at least 0.5 wt. % Si. 
     
     
         3 . The cobalt-niobium intermetallic alloy of  claim 2 , wherein the alloy includes at least 5 wt. % Cr, at least 0.1 wt. % Fe, at least 0.01 wt. % Ni and at least 0.5 wt. % Si. 
     
     
         4 . The cobalt-base niobium intermetallic alloy of  claim 1 , wherein the 1.5 wt. % total of other elements includes up to 0.25 wt. % C, up to 0.1 wt. % Mn, up to 0.2 wt. % Mo, up to 0.1 wt. % P, up to 0.1 wt. % S, up to 0.15 wt. % N, up to 0.1 wt. wt. % V, up to 0.1 wt. % Ti, up to 0.1 wt. % Al, up to 0.1 wt. % Hf, up to 0.1 wt. % Zr, up to 0.1 wt. % Ta, up to 0.1 wt. % W and up to 0.05 wt. % B. 
     
     
         5 . The cobalt-niobium intermetallic alloy of  claim 1 , wherein the alloy includes B in an amount of 0.001 to 0.05 wt. %. 
     
     
         6 . The cobalt-niobium intermetallic alloy of  claim 1 , wherein the alloy includes 0.01 to 0.25 wt. % C, 0.01 to 0.1 wt. % Mn, 1 to 3 wt. % Si, 0.01 to 5 wt. % Ni, 5 to 8.5 wt. % Cr, 0.01 to 0.2 wt. % Mo, 35 to 80 wt. % Co, 0.01 to 6 wt. % Fe, and 10 to 45 wt. % Nb. 
     
     
         7 . The cobalt-niobium intermetallic alloy of  claim 1 , wherein the alloy has a cast structure in which an intradendritic region includes Nb 6 Co 7  and/or NbCo 2  intermetallic phases. 
     
     
         8 . The cobalt-niobium intermetallic alloy of  claim 1 , wherein the alloy has a cast structure in which an interdendritic region includes a mixture of Nb 6 Co 7  and NbCo 2  intermetallic phases. 
     
     
         9 . The cobalt-niobium intermetallic alloy of  claim 1 , wherein the alloy has a cast structure of only the Nb 6 Co 7  intermetallic phase. 
     
     
         10 . The cobalt-niobium intermetallic alloy of  claim 1 , wherein the alloy has a cast structure of only the NbCo 2  intermetallic phase. 
     
     
         11 . The cobalt-niobium intermetallic alloy of  claim 1 , wherein the alloy includes 5 to 10 wt. % Cr, 0.01 to 5 wt. % Ni, 0.1 to 6 wt. % Fe and 1 to 3 wt. % Si. 
     
     
         12 . The cobalt-niobium intermetallic alloy of  claim 1 , wherein the alloy includes 5 to 10 wt. % Cr and 0.01 to 5 wt. % Ni. 
     
     
         13 . The cobalt-niobium intermetallic alloy of  claim 1 , wherein the alloy includes 5 to 10 wt. % Cr and 0.1 to 6 wt. % Fe. 
     
     
         14 . The cobalt-niobium intermetallic alloy of  claim 1 , wherein the alloy includes 5 to 10 wt. % Cr and 1 to 3 wt. % Si. 
     
     
         15 . The cobalt-niobium intermetallic alloy of  claim 1 , wherein the alloy includes 0.01 to 5 wt. % Ni and 0.1 to 6 wt. % Fe. 
     
     
         16 . The cobalt-niobium intermetallic alloy of  claim 1 , wherein the alloy includes 0.01 to 5 wt. % Ni and 1 to 3 wt. 5% Si. 
     
     
         17 . The cobalt-niobium intermetallic alloy of  claim 1 , wherein the alloy includes 0.1 to 6 wt. % Fe and 1 to 3 wt. % Si. 
     
     
         18 . An engine part such as a valve seat insert of a vehicle or an aerospace engine part made of the cobalt-niobium intermetallic alloy of  claim 1 . 
     
     
         19 . The engine part of  claim 18 , wherein the alloy has been melted and cast. 
     
     
         20 . The engine part of  claim 18 , wherein the alloy includes 0.01 to 0.25 wt. % C, 0.01 to 0.1 wt. % Mn, 1 to 3 wt. % Si, 0.01 to 5 wt. % Ni, 5 to 8.5 wt. % Cr, 0.01 to 0.2 wt. % Mo, 35 to 80 wt. % Co, 0.1 to 6 wt. % Fe, and 10 to 45 wt. % Nb.

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