Microalloying of niobium alloys
AssigneeSpirit AeroSystems, Inc.
InventorsRahbar Nasserrafi, Daniel Klenosky, Heath Edward Misak, Paul Ray Toivonen
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Abstract
The present disclosure is directed to methods for preparing a refractory alloy or recycled alloy using a niobium base alloy. In one embodiment, a niobium base alloy is microalloyed with one or more reactive element to form an intermediate alloy. Carbon is then added to the intermediate alloy to form the refractory alloy or recycled alloy. The disclosure is also directed to the refractory alloy or recycled alloy prepared according to the described methods.
Claims20
A method of preparing a refractory alloy, the method comprising:
- microalloying a niobium base alloy with one or more reactive element selected from the group consisting of Sc, Y, Er, Gd, Ce or combinations thereof, to form an intermediate alloy;
- and
- adding carbon to the intermediate alloy to form the refractory alloy;
- wherein the niobium base alloy optionally further comprises Hf, Ti, Mo, V, Zr, W, Ta, or combinations thereof.
A refractory alloy of the formula:
- Nb-10Hf-1Ti-0.15C-0.05Y-0.1Gd;
- Nb-10Hf-1.5Ti-0.10C-0.10Er-0.15Al-0.05Si;
- Nb-10Hf-5Mo-5V-1Zr-0.08C-0.08Sc;
- Nb-5Hf-10W-1Zr-0.10C-0.08Y-0.05Er;
- or
- Nb-12Hf-1Ti-1Zr-0.10C-0.08Er-0.15Al-0.08Y-0.1Si;
- wherein the refractory alloy is formed by a process comprising:
- microalloying a niobium base alloy with one or more reactive element selected from the group consisting of Sc, Y, Er, Gd, Ce or combinations thereof, to form an intermediate alloy;
- and
- adding carbon to the intermediate alloy to form the refractory alloy.
A refractory alloy of the formula:
- Nb-10Hf-1Ti-0.15C-0.05Y-0.1Gd;
- Nb-10Hf-1.5Ti-0.10C-0.10Er-0.15Al-0.05Si;
- Nb-10Hf-5Mo-5V-1Zr-0.08C-0.08Sc;
- Nb-5Hf-10W-1Zr-0.10C-0.08Y-0.05Er;
- or
- Nb-12Hf-1Ti-1Zr-0.10C-0.08Er-0.15Al-0.08Y-0.1Si.
Dependencies are inferred from the claim text.