KR-102961406-B1 - Ni-based alloy with excellent high-temperature oxidation resistance

Abstract

A Ni-based alloy with excellent high-temperature oxidation resistance is provided even when the Cr content is reduced. The alloy is a Ni-based alloy containing, in mass%, Al: 2.0–5.0%, Si: 0.1–2.5%, Mn: 0.1–1.5%, V: 0.4–3.0%, B: 0.001–0.05%, Zr: 0.001–0.1%, with the remainder being Ni and impurities. Additionally, the alloy is a Ni-based alloy containing Mo: 2.0% or less to this composition. These Ni-based alloys also have excellent hot workability.

Inventors

• 이바라 무네히토
• 타쿠와 모에미
• 무라타 히데오
• 사카이 히로카즈

Assignees

• 가부시키가이샤 프로테리아루

Dates

Publication Date

20260508

Application Date

20230713

Priority Date

20220825

Claims (3)

1. A Ni-based alloy with excellent high-temperature oxidation resistance, characterized by containing, in mass%, Al: 2.0–5.0%, Si: 0.1–2.5%, Mn: 0.1–1.5%, V: 0.4–3.0%, B: 0.001–0.05%, Zr: 0.001–0.1%, and the remainder being a composition of Ni and impurities.
2. In Article 1, A Ni-based alloy with excellent high-temperature oxidation resistance, characterized by containing V: 1.0 to 3.0% by mass.
3. In Article 1 or Article 2, A Ni-based alloy with excellent high-temperature oxidation resistance, characterized by further containing Mo: 2.0% or less in mass%.

Description

Ni-based alloy with excellent high-temperature oxidation resistance The present invention relates to a Ni-based alloy. Generally, for components such as trays used in oxidation furnaces or firing furnaces, a Ni-based alloy with excellent high-temperature oxidation resistance is used to prevent the incorporation of oxide scale generated from the component into the product. As such, a Ni-based alloy is proposed that contains, for example, Al: 2.0–5.0%, Si: 0.1–2.5%, Cr: 0.8–4.0%, Mn: 0.1–1.5%, B: 0.001–0.01%, Zr: 0.001–0.1% in mass%, and the remainder consists of Ni and unavoidable impurities (Patent Document 1). In addition, as such a Ni-based alloy, a Ni-based alloy is proposed that contains, for example, in mass%, Al: 2.0–5.0%, Si: 0.1–2.5%, Mn: 0.1–1.5%, B: 0.001–0.01%, Zr: 0.001–0.1%, and the remainder consists of Ni and unavoidable impurities (Patent Document 2). The Ni-based alloys of Patent Documents 1 and 2 are desirable as alloys constituting components, such as firing trays for chip capacitors and firing trays for positive electrode materials for lithium batteries, due to their excellent high-temperature oxidation resistance. In addition, the Ni-based alloy of Patent Document 1 is also desirable as an alloy constituting components for CVD devices, PVD devices, LCD devices, semiconductor manufacturing devices, etc. Figure 1 is a figure showing the method of the repeated oxidation test performed in the example. Figure 2 is a figure showing the results of a repeated oxidation test performed in an example. Figure 3 is a figure showing the results of a repeated oxidation test performed in the example. Figure 4 is a figure showing the results of a repeated oxidation test performed in the example. Figure 5 is a figure showing the results of a repeated oxidation test performed in the example. Figure 6 is a figure showing the results of a tensile test performed in an example. Figure 7 is a figure showing the results of a tensile test performed in an example. The feature of the present invention is that it discovers a Ni-based alloy capable of maintaining the high-temperature oxidation resistance of Patent Document 1, even when the Cr content is reduced or when it is not added. Below, the reasons for the numerical limitations of each constituent element in the composition of the Ni-based alloy of the present invention will be explained in detail. Al: Al is an element that forms an alumina film on the surface of Ni-based alloys, improves high-temperature oxidation resistance, and reduces the occurrence of oxide scale. However, if there is too much, the γ' phase ( Ni₃Al intermetallic compound) precipitates in the body of the Ni-based alloy, which lowers hot workability and makes processing difficult. Accordingly, the Al content is set to 2.0 to 5.0 mass% (hereinafter simply indicated as “%”). Preferably, it is 2.5% or more, more preferably 3.0% or more, and even more preferably 3.5% or more. In addition, it is preferably 4.7% or less, more preferably 4.5% or less, and even more preferably 4.2% or less. Si: Si is an element that improves high-temperature oxidation resistance. However, if there is too much, disintegration is likely to occur during hot working. Therefore, the Si content is set to 0.1 to 2.5%. Preferably, it is 0.3% or more, more preferably 0.6% or more, and even more preferably 0.8% or more. In addition, it is preferably 2.2% or less, more preferably 1.9% or less, and even more preferably 1.7% or less. Mn: Mn is an element that improves high-temperature strength. However, if there is too much, high-temperature oxidation resistance decreases. Therefore, the Mn content is set to 0.1 to 1.5%. Preferably, it is 0.2% or more, more preferably 0.3% or more, and even more preferably 0.4% or more. In addition, it is preferably 1.2% or less, more preferably 0.9% or less, and even more preferably 0.6% or less. V: V is a useful element to replace Cr because it is an element that improves high-temperature oxidation resistance. However, if the amount is too high, the precipitation of the γ' phase ( Ni₃V intermetallic compound) increases, which lowers hot workability. Therefore, the V content is set to 0.4 to 3.0%. Preferably, it is 0.7% or more, more preferably 0.9% or more, and even more preferably 1.0% or more. Also, it is preferably 1.1% or more, more preferably 1.2% or more, and even more preferably 1.3% or more. Also, it is preferably 2.7% or less, more preferably 2.4% or less, and even more preferably 2.1% or less. Also, it is preferably 1.8% or less, more preferably 1.6% or less, and even more preferably 1.4% or less. B and Zr: B and Zr have the effect of improving the hot forgeability of Ni-based alloys by co-containing them. This is presumed to be because the simultaneous inclusion of B and Zr strengthens the grain boundaries of the Ni-based alloy, thereby suppressing the occurrence of intergranular fracture during hot forging. In addition, if B is too small, the desired improvement effect in the abov