Compositions are provided that exhibit an austenitic nickel microstructure. The compositions comprise Ni, Cr, Mo and at least one element selected from the group consisting of Al, Si, and Ti. Feedstock having the composition may be in the form of a cored wire or wires, a solid wire or wires, or a po
Compositions are provided that exhibit an austenitic nickel microstructure. The compositions comprise Ni, Cr, Mo and at least one element selected from the group consisting of Al, Si, and Ti. Feedstock having the composition may be in the form of a cored wire or wires, a solid wire or wires, or a powder.
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1. A thermal spray feedstock having a composition comprising: between 12 and 25 wt. % Cr;between 2 and 15 wt. % Mo;between 0.25 and 12 wt. % Al;between 4.83 and 6.21 wt. % Si;between 0 and 5 wt. % Ti; anda balance of Ni;wherein the feedstock is configured to form a microstructure exhibiting at least
1. A thermal spray feedstock having a composition comprising: between 12 and 25 wt. % Cr;between 2 and 15 wt. % Mo;between 0.25 and 12 wt. % Al;between 4.83 and 6.21 wt. % Si;between 0 and 5 wt. % Ti; anda balance of Ni;wherein the feedstock is configured to form a microstructure exhibiting at least 75% volume fraction in the form of an austenitic nickel phase structure;wherein at least some of the Si, Ti, or Al in the composition is in the form of metallic Si, Ti, or Al; andwherein the composition of the thermal spray feedstock is at least one of a first wire, a second wire, or a combination of the first and second wires. 2. The thermal spray feedstock of claim 1, wherein the composition comprises: between 8 and 15 wt. % Mo. 3. The thermal spray feedstock of claim 1, wherein the total amount of Si, Ti, and Al is less than or equal to 12 wt. %. 4. The thermal spray feedstock of claim 1, wherein the total concentration of Si, Ti, and Al is between 5.08 and 20% and the concentration of Al is less than or equal to 10%. 5. The thermal spray feedstock of claim 1, wherein the total concentration of Si, Ti, and Al is between 5.08 and 10% and the concentration of Al less than or equal to 7%. 6. The thermal spray feedstock of claim 1, wherein the composition comprises: between 20 and 20.4 wt. % Cr;between 8.64 and 12.7 wt. % Mo;between 1.85 and 3 wt. % Al; andbetween 0.15 and 1 wt. % Ti. 7. The thermal spray feedstock of claim 1, wherein the composition comprises: a balance of Ni, 1.85 wt. % Al, 20 wt. % Cr, 10.4 wt. % Mo, 6.21 wt. % Si, and 0.16 wt. % Ti;a balance of Ni, 2.73 wt. % Al, 20.4 wt. % Cr, 8.64 wt. % Mo, 4.83 wt. % Si, and 0.67 wt. % Ti;a balance of Ni, 1.5 wt. % Al, 20 wt. % Cr, 12.7 wt. % Mo, 5.98 wt. % Si, and 0.15 wt. % Ti; ora balance of Ni, 3 wt. % Al, 20 wt. % Cr, 12.7 wt. % Mo, 5.98 wt. % Si, and 1.0 wt. % Ti. 8. The thermal spray feedstock of claim 1, wherein the composition comprises: less than 13 wt. % Mo;less than 2 wt. % Al;less than 6 wt. % Si; andless than 0.25 wt. % Ti. 9. The thermal spray feedstock of claim 1, wherein, when applied using a thermal spray process to form a coating, the coating has at least 10% less Al than the amount of Al in the composition. 10. The thermal spray feedstock of claim 1, wherein at least some of the Si, Ti, or Al in the composition is in the form of oxides, nitrides, carbo-nitrides, carbides, or complexes thereof. 11. The thermal spray feedstock of claim 1, wherein the first or second wire is at least one of a welding wire or thermal spray wire. 12. The thermal spray feedstock of claim 11, wherein the welding wire or thermal spray wire is a cored welding or thermal spray wire. 13. The thermal spray feedstock of claim 12, wherein the cored welding or thermal spray wire comprises: a sheath comprising a Ni, a Ni—Cr alloy, or a Ni—Cr—Mo alloy; anda powder feedstock comprising the composition. 14. The thermal spray feedstock of claim 1 wherein the thermal spray feedstock comprises both the first and second wires. 15. The thermal spray feedstock of claim 14, wherein the first or second wire is a cored welding wire or thermal spray wire. 16. The thermal spray feedstock of claim 15, wherein the cored welding wire or thermal spray wire comprises: a sheath comprising a Ni, a Ni—Cr, or a Ni—Cr—Mo alloy; anda powder feedstock comprising Mo, Al, Si, or Ti. 17. A coating formed from the thermal spray feedstock of claim 1, the coating having a coating composition. 18. The coating of claim 17, wherein the coating composition has at least 10% less Al than the composition of the feedstock. 19. The thermal spray feedstock of claim 1, wherein a coating formed by the thermal spray feedstock tests negatively in a ferroxyl test according to ASTM A967 Practice E. 20. A composition consisting of: between 12 and 25 wt. % Cr;between 2 and 15 wt. % Mo;between 0.25 and 12 wt. % Al;between 4.83 and 6.21 wt. % Si;between 0 and 5 wt. % Ti; anda balance of Ni;wherein the composition is configured to form a microstructure exhibiting at least 75% volume fraction in the form of an austenitic nickel phase structure. 21. The composition of claim 20, wherein the composition has between 8 and 15 wt. % Mo. 22. The composition of claim 20, wherein the total amount of Si, Ti, and Al is less than or equal to 12 wt. %. 23. The composition of claim 20, wherein the total concentration of Si, Ti, and Al is between 5.08 and 20% and the concentration of Al is less than or equal to 10%. 24. The composition of claim 20, wherein the total concentration of Si, Ti, and Al is between 5.08 and 10% and the concentration of Al less than or equal to 7%. 25. The composition of claim 20, wherein the composition consists of: a balance of Ni, 1.85 wt. % Al, 20 wt. % Cr, 10.4 wt. % Mo, 6.21 wt. % Si, and 0.16 wt. % Ti;a balance of Ni, 2.73 wt. % Al, 20.4 wt. % Cr, 8.64 wt. % Mo, 4.83 wt. % Si, and 0.67 wt. % Ti;a balance of Ni, 1.5 wt. % Al, 20 wt. % Cr, 12.7 wt. % Mo, 5.98 wt. % Si, and 0.15 wt. % Ti; ora balance of Ni, 3 wt. % Al, 20 wt. % Cr, 12.7 wt. % Mo, 5.98 wt. % Si, and 1.0 wt. % Ti. 26. The composition of claim 20, wherein the composition is formed from: a first wire; anda second wire. 27. The composition of claim 26, wherein the first or second wire is a cored welding wire or thermal spray wire. 28. The composition of claim 27, wherein the cored welding wire or thermal spray wire comprises: a sheath comprising a Ni, a Ni—Cr, or a Ni—Cr—Mo alloy; anda powder feedstock comprising Mo, Al, Si, or Ti. 29. A coating formed from the composition of claim 20, the coating having a coating composition. 30. A thermal spray feedstock having a composition comprising: between 12 and 25 wt. % Cr;between 2 and 15 wt. % Mo;between 0.25 and 12 wt. % Al;at least 4.83 wt. % Si;between 0 and 5 wt. % Ti; anda balance of Ni;wherein the feedstock is configured to form a microstructure exhibiting at least 75% volume fraction in the form of an austenitic nickel phase structure;wherein at least some of the Si, Ti, or Al in the composition is in the form of metallic Si, Ti, or Al; andwherein the composition of the thermal spray feedstock is at least one of a first wire, a second wire, or a combination of the first and second wires. 31. A coating formed from the thermal spray feedstock of claim 30.
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