High-temperature-oxidation-resistant nickel-based alloy material and preparation method thereof

Abstract

The invention relates to the technical field of alloy materials, in particular to a high-temperature-resistant nickel-oxide-based alloy material and a preparation method thereof.The high-temperature-resistant nickel-oxide-based alloy material comprises, by mass, 12.0%-18.0% of Cr, 8.0%-12.0% of Co, 4.5%-6.5% of W, 1.5%-2.5% of Mo, 5.5%-6.5% of Al, 0.1%-0.3% of Y + La, 1.5%-3.2% of Nb and the balance Ni and inevitable impurities, and the preparation method of the high-temperature-resistant nickel-oxide-based alloy material comprises the steps that molten alloy liquid is poured and cooled, and a cast ingot is obtained; carrying out directional solidification treatment on the cast ingot to obtain a directional solidification cast ingot; and the directionally solidified cast ingot is subjected to aging treatment, and the high-temperature-oxidation-resistant nickel-based alloy material is obtained. The high-temperature oxidation-resistant nickel-based alloy material is excellent in high-temperature mechanical property, stable in bearing under the high-temperature working condition, appropriate in ductility and good in plasticity, and the high-temperature service stability is remarkably improved.

Description

Technical Field

[0001] This application relates to the field of alloy materials technology, and more specifically, to a high-temperature resistant nickel oxide-based alloy material and its preparation method. Background Technology

[0002] Nickel-based alloys are widely used in high-temperature critical components such as aero-engine turbine blades and gas turbine combustors due to their excellent high-temperature mechanical properties. These components are exposed to high-temperature oxidizing environments of 800-1200℃ for extended periods, and the material's resistance to high-temperature oxidation and its high-temperature strength directly determine the service life and safety of the components.

[0003] Existing nickel-based alloys typically enhance their oxidation resistance by adding Cr and Al elements to form an oxide film. However, the following technical defects still exist: (1) When traditional alloys are used for long-term service at temperatures above 1000°C, the surface oxide film is prone to cracking and peeling, leading to continuous oxidation of the substrate and shortening the service life; (2) Simply increasing the Al content to enhance oxidation resistance will result in excessive precipitation of the brittle γ' phase in the alloy, reducing the high-temperature toughness and fatigue resistance of the alloy; (3) Existing preparation methods mostly adopt a process of first melting in a vacuum induction furnace and then forging. This process is prone to compositional segregation, resulting in uneven alloy structure and large fluctuations in oxidation resistance and mechanical properties in local areas, making it difficult to meet the performance consistency requirements of high-precision high-temperature components. Therefore, it is urgent to develop a nickel-based alloy material that has excellent high-temperature oxidation resistance, high-temperature strength and toughness, and a stable preparation process to solve the problem of short service life of high-temperature components. Summary of the Invention

[0004] To address the technical problems mentioned in the background art, this application provides a high-temperature resistant nickel oxide-based alloy material.

[0005] This application provides a high-temperature resistant nickel oxide-based alloy material, employing the following technical solution: A high-temperature resistant nickel oxide-based alloy material, whose chemical composition by mass percentage includes: Cr: 12.0-18.0%, Co: 8.0-12.0%, W: 4.5-6.5%, Mo: 1.5-2.5%, Al: 5.5-6.5%, Y + La: 0.1-0.3%, Nb: 1.5-3.2%, with the balance being Ni and unavoidable impurities.

[0006] Preferably, the chemical components also satisfy the following quantitative relationships: 2.0≤[Al] / [Nb]≤4.0, 0.6≤[Y] / ([Y+La])≤0.7, 1.5≤[Co] / ([W]+[Mo])≤3.0; wherein [Al], [Nb], [Y], [Y+La], [Co], [W] and [Mo] are the mass percentage contents of Al, Nb, Y, Y+La, Co, W and Mo, respectively.

[0007] This application also provides a method for preparing a high-temperature resistant nickel oxide-based alloy material, employing the following technical solution: A method for preparing a high-temperature resistant nickel oxide-based alloy material includes the following preparation steps: Step 1: Prepare the ingredients according to the above composition, carry out the segmented melting process in a vacuum induction furnace, and after slag removal and deoxidation, obtain molten alloy liquid; Step 2: Cool the molten alloy liquid to 1400-1450℃, then pour it into a graphite mold preheated to 800-900℃, and let it cool naturally to room temperature to obtain an ingot; Step 3: Add the ingot to the directional solidification furnace, controlling the vacuum degree to ≤1×10⁻⁶. -3 Pa, heated to 1500-1550℃ and held for 2-3 hours, is then subjected to directional solidification. After solidification, it is cooled to 500-600℃ at a rate of 30-40℃ / min to obtain a directional solidified ingot. Step 4: Place the directional solidification ingot in an inert gas atmosphere and hold it at 1150-1200℃ for 4-6 hours. Then, quench it in water to room temperature and aging it to obtain a high-temperature nickel oxide-based alloy material.

[0008] Preferably, the segmented smelting process in step 1 is as follows: heating to 1650-1700℃ at a rate of 8-10℃ / min, first adding Ni, W, and Mo, and holding for 40-50min; heating to 1700-1750℃ at a rate of 3-5℃ / min, then adding Cr, Co, and Nb, and holding for 20-30min; cooling to 1550-1600℃ at a rate of 5-10℃ / min, adding Al, Y, and La, and holding for 10-15min.

[0009] Preferably, in step 2, the molten alloy liquid is cooled to 1400-1450℃ at a cooling rate of 5-7℃ / min.

[0010] Preferably, the directional solidification working parameters in step 3 are: an axial temperature gradient of 12-15℃ / cm and a solidification rate of 5-8mm / h.

[0011] Preferably, the ratio of the axial temperature gradient to the solidification rate is 0.2-0.3 °C·h / mm. 2.

[0012] Preferably, the aging process in step 4 is as follows: heating to 850-900℃ at a heating rate of T℃ / min, holding for 4-6 hours, cooling to 750-800℃ at a cooling rate of 1-5℃ / min, and holding for 16-20 hours.

[0013] Preferably, in the process of heating to 850-900℃ at a heating rate of T℃ / min, T = 5.2 + 0.8 × [Al] / [Nb], where [Al] and [Nb] are the mass percentage contents of Al and Nb, respectively.

[0014] In summary, this application has the following beneficial effects: In the process of preparing high-temperature nickel oxide-based alloy materials, this application strictly controls the ratio range of [Al] / [Nb], [Y] / ([Y+La]), and [Co] / ([W]+[Mo]), which can achieve multi-dimensional synergistic optimization of material microstructure, properties and preparation process. The [Al] / [Nb] ratio precisely balances the precipitation strengthening effect of the γ' phase (Ni3Al) with the suppression of TCP phases (such as μ phase and σ phase). This ensures sufficient Al to form a dense and continuous Al2O3 oxide film to enhance the oxidation resistance, while avoiding excessive Al leading to over-coarsening of the γ' phase or excessive Nb leading to the formation of a low-melting-point Ni5Nb phase. Simultaneously, it matches the dynamic heating rate during aging treatment to optimize the size and distribution of precipitates. This avoids excessive coarsening of the precipitates in Al-rich regions due to a low heating rate when the [Al] / [Nb] ratio is high, thus destroying the strengthening effect of the γ' phase. It also avoids excessive heating rate in Nb-rich regions due to a low [Al] / [Nb] ratio, which disrupts the phase structure and affects the stability of the precipitates. Ultimately, this leads to a decrease in the alloy's high-temperature oxidation resistance and fluctuations in mechanical properties. The [Y] / ([Y+La]) ratio, dominated by Y, works synergistically with La and sulfur impurities in the alloy to suppress intra-grain boundary oxidation and enhance the adhesion of the Al2O3 oxide film, thereby significantly improving the high-temperature oxidation resistance of the alloy material. The [Co] / ([W]+[Mo]) ratio prevents excessive W and Mo from causing TCP phase precipitation or excessive Co from reducing the volume fraction of the γ' phase. Combined with the axial temperature gradient / solidification rate ratio of directional solidification, it refines the columnar grain structure and reduces segregation, improving high-temperature creep resistance and durability. Under the synergistic effect of these three factors, the alloy can still maintain the cubic morphology and structural stability of the γ' phase after long-term high-temperature aging, ultimately possessing excellent high-temperature oxidation resistance, mechanical properties, and process adaptability, meeting the application requirements of extreme high-temperature scenarios.

[0015] This application employs a segmented melting process to specifically address the characteristics of different elements, ensuring the quality of the molten alloy. First, the matrix element Ni and high-melting-point strengthening elements W and Mo are added. Sufficient heat treatment adapts to the high melting point characteristics of these two elements, ensuring their complete dissolution and laying a stable foundation for subsequent compositional homogeneity. Next, Cr, Co, and Nb are added gradually with increasing temperature to prevent compositional segregation caused by sudden temperature rises, while also adapting to the dissolution requirements of these elements to ensure their uniform diffusion within the matrix. Finally, easily oxidized, low-melting-point elements Al, Y, and La are added after cooling. The low-temperature environment reduces high-temperature burn-off and oxidation losses of these three elements, preventing compositional segregation due to excessive diffusion. The overall process fully considers the physicochemical properties of various elements, achieving alloy composition homogeneity and reducing the loss of key elements, thus laying a solid foundation for the subsequent ingot forming quality and the final high-temperature oxidation resistance and mechanical properties of the alloy. Detailed Implementation

[0016] The present application will be further described in detail below with reference to the embodiments.

[0017] Examples 1-3 provide a high-temperature resistant nickel oxide-based alloy material and its preparation method.

[0018] Example 1 A high-temperature resistant nickel oxide-based alloy material, whose chemical composition by mass percentage includes: Cr: 12.0%, Co: 9.0%, W: 4.5%, Mo: 1.5%, Al: 5.5%, Y: 0.2%, La: 0.1%, Nb: 1.5%, with the balance being Ni and unavoidable impurities.

[0019] A method for preparing a high-temperature resistant nickel oxide-based alloy material includes the following preparation steps: Step 1: Prepare the ingredients according to the above composition and carry out a segmented melting process in a vacuum induction furnace. After slag removal and deoxidation, a molten alloy liquid is obtained. The segmented melting process is controlled as follows: heat up to 1650℃ at a rate of 8℃ / min, add Ni, W and Mo first, and hold for 40min; heat up to 1700℃ at a rate of 3℃ / min, then add Cr, Co and Nb, and hold for 20min; cool down to 1550℃ at a rate of 5℃ / min, add Al, Y and La, and hold for 10min. Step 2: Cool the molten alloy liquid to 1400°C at a cooling rate of 5°C / min, then pour it into a graphite mold preheated to 800°C, and allow it to cool naturally to room temperature to obtain an ingot. Step 3: Add the ingot to the directional solidification furnace and control the vacuum degree to 1×10⁻⁶. -3 Pa was heated to 1500℃ and held for 2 hours. The solidification rate was 5 mm / h, with an axial temperature gradient of 12℃ / cm. The ratio of axial temperature gradient to solidification rate was controlled at 0.24℃・h / mm.2 The solidified material is subjected to directional solidification treatment. After solidification, it is cooled to 500°C at a rate of 30°C / min to obtain a directional solidified ingot. Step 4: Place the directional solidification ingot in an argon atmosphere and hold it at 1150℃ for 4 hours. Then, quench it in water to room temperature, raise the temperature to 850℃ at a heating rate of T=8.13℃ / min, hold it for 4 hours, and lower it to 750℃ at a cooling rate of 1℃ / min. Hold it for 16 hours. After aging treatment, a high-temperature resistant nickel oxide-based alloy material is obtained.

[0020] Example 2 A high-temperature resistant nickel oxide-based alloy material, whose chemical composition by mass percentage includes: Cr: 15.0%, Co: 10.0%, W: 4.8%, Mo: 1.8%, Al: 6.3%, Y: 0.15%, La: 0.1%, Nb: 2.1%, with the balance being Ni and unavoidable impurities.

[0021] A method for preparing a high-temperature resistant nickel oxide-based alloy material includes the following preparation steps: Step 1: Prepare the ingredients according to the above composition and carry out a segmented melting process in a vacuum induction furnace. After slag removal and deoxidation, a molten alloy liquid is obtained. The segmented melting process is controlled as follows: heat up to 1680℃ at a rate of 9℃ / min, add Ni, W and Mo first, and hold for 45min; heat up to 1725℃ at a rate of 4℃ / min, then add Cr, Co and Nb, and hold for 25min; cool down to 1580℃ at a rate of 8℃ / min, add Al, Y and La, and hold for 12min. Step 2: Cool the molten alloy liquid to 1425°C at a cooling rate of 6°C / min, then pour it into a graphite mold preheated to 850°C, and allow it to cool naturally to room temperature to obtain an ingot. Step 3: Add the ingot to the directional solidification furnace and control the vacuum degree to 1×10⁻⁶. -3 Pa was heated to 1525℃ and held for 2.5 h. The solidification rate was 7 mm / h with an axial temperature gradient of 14℃ / cm. The ratio of axial temperature gradient to solidification rate was 0.2℃・h / mm. 2 The solidified material is subjected to directional solidification treatment. After solidification, it is cooled to 550°C at a rate of 35°C / min to obtain a directional solidified ingot. Step 4: Place the directional solidification ingot in an argon atmosphere and hold it at 1180℃ for 5 hours. Then, quench it in water to room temperature, raise the temperature to 880℃ at a heating rate of T=7.6℃ / min, hold it for 5 hours, lower the temperature to 780℃ at a cooling rate of 3℃ / min, hold it for 18 hours, and then perform aging treatment to obtain a high-temperature resistant nickel oxide-based alloy material.

[0022] Example 3 A high-temperature resistant nickel oxide-based alloy material, whose chemical composition by mass percentage includes: Cr: 18.0%, Co: 12.0%, W: 5.0%, Mo: 2.0%, Al: 6.5%, Y: 0.07%, La: 0.03%, Nb: 2.0%, with the balance being Ni and unavoidable impurities.

[0023] A method for preparing a high-temperature resistant nickel oxide-based alloy material includes the following preparation steps: Step 1: Prepare the ingredients according to the above composition and carry out a segmented melting process in a vacuum induction furnace. After slag removal and deoxidation, a molten alloy liquid is obtained. The segmented melting process is controlled as follows: heat up to 1700℃ at a rate of 10℃ / min, add Ni, W, and Mo first, and hold for 50min; heat up to 1750℃ at a rate of 5℃ / min, then add Cr, Co, and Nb, and hold for 30min; cool down to 1600℃ at a rate of 10℃ / min, add Al, Y, and La, and hold for 15min. Step 2: Cool the molten alloy liquid to 1450°C at a cooling rate of 7°C / min, then pour it into a graphite mold preheated to 900°C, and allow it to cool naturally to room temperature to obtain an ingot. Step 3: Add the ingot to the directional solidification furnace and control the vacuum degree to 1×10⁻⁶. -3 Pa was heated to 1550℃ and held for 3 hours. With an axial temperature gradient of 15℃ / cm and a solidification rate of 7mm / h, the ratio of axial temperature gradient to solidification rate was 0.214℃・h / mm. 2 The solidified material is subjected to directional solidification treatment. After solidification, it is cooled to 600°C at a rate of 40°C / min to obtain a directional solidified ingot. Step 4: Place the directional solidification ingot in an argon atmosphere, hold it at 1200℃ for 6 hours, cool it to room temperature with water, raise the temperature to 900℃ at a heating rate of T=7.8℃ / min, hold it for 6 hours, lower the temperature to 800℃ at a cooling rate of 5℃ / min, hold it for 20 hours, and then age it to obtain a high-temperature resistant nickel oxide-based alloy material.

[0024] Comparative Example 1 A high-temperature resistant nickel oxide-based alloy material, whose chemical composition by mass percentage includes: Cr: 12.0%, Co: 9.0%, W: 4.5%, Mo: 1.5%, Al: 5.5%, Y: 0.2%, La: 0.1%, Nb: 3.2%, with the balance being Ni and unavoidable impurities.

[0025] A method for preparing a high-temperature resistant nickel oxide-based alloy material includes the following preparation steps: Step 1: Prepare the ingredients according to the above composition and carry out a segmented melting process in a vacuum induction furnace. After slag removal and deoxidation, a molten alloy liquid is obtained. The segmented melting process is controlled as follows: heat up to 1650℃ at a rate of 8℃ / min, add Ni, W and Mo first, and hold for 40min; heat up to 1700℃ at a rate of 3℃ / min, then add Cr, Co and Nb, and hold for 20min; cool down to 1550℃ at a rate of 5℃ / min, add Al, Y and La, and hold for 10min. Step 2: Cool the molten alloy liquid to 1400°C at a cooling rate of 5°C / min, then pour it into a graphite mold preheated to 800°C, and allow it to cool naturally to room temperature to obtain an ingot. Step 3: Add the ingot to the directional solidification furnace and control the vacuum degree to 1×10⁻⁶. -3 Pa was heated to 1500℃ and held for 2 hours. The solidification rate was 5 mm / h, with an axial temperature gradient of 12℃ / cm. The ratio of axial temperature gradient to solidification rate was controlled at 0.24℃・h / mm. 2 The solidified material is subjected to directional solidification treatment. After solidification, it is cooled to 500°C at a rate of 30°C / min to obtain a directional solidified ingot. Step 4: Place the directional solidification ingot in an argon atmosphere, hold it at 1150℃ for 4 hours, cool it to room temperature by water quenching, raise the temperature to 850℃ at a heating rate of T=8.13℃ / min, hold it for 4 hours, lower the temperature to 750℃ at a cooling rate of 1℃ / min, hold it for 16 hours, and then age it to obtain a high-temperature resistant nickel oxide-based alloy material.

[0026] Comparative Example 2 A high-temperature resistant nickel oxide-based alloy material, whose chemical composition by mass percentage includes: Cr: 12.0%, Co: 9.0%, W: 4.5%, Mo: 1.5%, Al: 5.5%, Y: 0.1%, La: 0.2%, Nb: 1.5%, with the balance being Ni and unavoidable impurities.

[0027] A method for preparing a high-temperature resistant nickel oxide-based alloy material includes the following preparation steps: Step 1: Prepare the ingredients according to the above composition and carry out a segmented melting process in a vacuum induction furnace. After slag removal and deoxidation, a molten alloy liquid is obtained. The segmented melting process is controlled as follows: heat up to 1650℃ at a rate of 8℃ / min, add Ni, W and Mo first, and hold for 40min; heat up to 1700℃ at a rate of 3℃ / min, then add Cr, Co and Nb, and hold for 20min; cool down to 1550℃ at a rate of 5℃ / min, add Al, Y and La, and hold for 10min. Step 2: Cool the molten alloy liquid to 1400°C at a cooling rate of 5°C / min, then pour it into a graphite mold preheated to 800°C, and allow it to cool naturally to room temperature to obtain an ingot. Step 3: Add the ingot to the directional solidification furnace and control the vacuum degree to 1×10⁻⁶. -3 Pa was heated to 1500℃ and held for 2 hours. The solidification rate was 5 mm / h, with an axial temperature gradient of 12℃ / cm. The ratio of axial temperature gradient to solidification rate was controlled at 0.24℃・h / mm. 2 The solidified material is subjected to directional solidification treatment. After solidification, it is cooled to 500°C at a rate of 30°C / min to obtain a directional solidified ingot. Step 4: Place the directional solidification ingot in an argon atmosphere, hold it at 1150℃ for 4 hours, cool it to room temperature by water quenching, raise the temperature to 850℃ at a heating rate of T=8.13℃ / min, hold it for 4 hours, lower the temperature to 750℃ at a cooling rate of 1℃ / min, hold it for 16 hours, and then age it to obtain a high-temperature resistant nickel oxide-based alloy material.

[0028] Comparative Example 3 A high-temperature resistant nickel oxide-based alloy material, whose chemical composition by mass percentage includes: Cr: 12.0%, Co: 9.0%, W: 6.5%, Mo: 2.5%, Al: 5.5%, Y: 0.2%, La: 0.1%, Nb: 1.5%, with the balance being Ni and unavoidable impurities.

[0029] A method for preparing a high-temperature resistant nickel oxide-based alloy material includes the following preparation steps: Step 1: Prepare the ingredients according to the above composition and carry out a segmented melting process in a vacuum induction furnace. After slag removal and deoxidation, a molten alloy liquid is obtained. The segmented melting process is controlled as follows: heat up to 1650℃ at a rate of 8℃ / min, add Ni, W and Mo first, and hold for 40min; heat up to 1700℃ at a rate of 3℃ / min, then add Cr, Co and Nb, and hold for 20min; cool down to 1550℃ at a rate of 5℃ / min, add Al, Y and La, and hold for 10min. Step 2: Cool the molten alloy liquid to 1400°C at a cooling rate of 5°C / min, then pour it into a graphite mold preheated to 800°C, and allow it to cool naturally to room temperature to obtain an ingot. Step 3: Add the ingot to the directional solidification furnace and control the vacuum degree to 1×10⁻⁶. -3 Pa was heated to 1500℃ and held for 2 hours. The solidification rate was 5 mm / h, with an axial temperature gradient of 12℃ / cm. The ratio of axial temperature gradient to solidification rate was controlled at 0.24℃・h / mm. 2The solidified material is subjected to directional solidification treatment. After solidification, it is cooled to 500°C at a rate of 30°C / min to obtain a directional solidified ingot. Step 4: Place the directional solidification ingot in an argon atmosphere, hold it at 1150℃ for 4 hours, cool it to room temperature by water quenching, raise the temperature to 850℃ at a heating rate of T=8.13℃ / min, hold it for 4 hours, lower the temperature to 750℃ at a cooling rate of 1℃ / min, hold it for 16 hours, and then age it to obtain a high-temperature resistant nickel oxide-based alloy material.

[0030] Comparative Example 4 A high-temperature resistant nickel oxide-based alloy material, whose chemical composition by mass percentage includes: Cr: 12.0%, Co: 9.0%, W: 4.5%, Mo: 1.5%, Al: 5.5%, Y: 0.2%, La: 0.1%, Nb: 1.5%, with the balance being Ni and unavoidable impurities.

[0031] A method for preparing a high-temperature resistant nickel oxide-based alloy material includes the following preparation steps: Step 1: Prepare the ingredients according to the above composition and carry out the melting process in a vacuum induction furnace. After slag removal and deoxidation, a molten alloy liquid is obtained. The segmented melting process is controlled as follows: heat up to 1700℃ at a rate of 8℃ / min, add Ni, W, Mo, Cr, Co, and Nb first, and hold for 60min; cool down to 1550℃ at a rate of 5℃ / min, add Al, Y, and La, and hold for 10min. Step 2: Cool the molten alloy liquid to 1400°C at a cooling rate of 5°C / min, then pour it into a graphite mold preheated to 800°C, and allow it to cool naturally to room temperature to obtain an ingot. Step 3: Add the ingot to the directional solidification furnace and control the vacuum degree to 1×10⁻⁶. -3 Pa was heated to 1500℃ and held for 2 hours. The solidification rate was 5 mm / h, with an axial temperature gradient of 12℃ / cm. The ratio of axial temperature gradient to solidification rate was controlled at 0.24℃・h / mm. 2 The solidified material is subjected to directional solidification treatment. After solidification, it is cooled to 500°C at a rate of 30°C / min to obtain a directional solidified ingot. Step 4: Place the directional solidification ingot in an argon atmosphere, hold it at 1150℃ for 4 hours, cool it to room temperature by water quenching, raise the temperature to 850℃ at a heating rate of T=8.13℃ / min, hold it for 4 hours, lower the temperature to 750℃ at a cooling rate of 1℃ / min, hold it for 16 hours, and then age it to obtain a high-temperature resistant nickel oxide-based alloy material.

[0032] Comparative Example 5 A high-temperature resistant nickel oxide-based alloy material, whose chemical composition by mass percentage includes: Cr: 12.0%, Co: 9.0%, W: 4.5%, Mo: 1.5%, Al: 5.5%, Y: 0.2%, La: 0.1%, Nb: 1.5%, with the balance being Ni and unavoidable impurities.

[0033] A method for preparing a high-temperature resistant nickel oxide-based alloy material includes the following preparation steps: Step 1: Prepare the ingredients according to the above composition, and carry out the melting process in a vacuum induction furnace. After slag removal and deoxidation, molten alloy liquid is obtained. The melting process is controlled as follows: heat up to 1650℃ at a rate of 8℃ / min, add Ni, W, Mo, Cr, Co, Nb, Al, Y, and La, and hold for 70min. Step 2: Cool the molten alloy liquid to 1400°C at a cooling rate of 5°C / min, then pour it into a graphite mold preheated to 800°C, and allow it to cool naturally to room temperature to obtain an ingot. Step 3: Add the ingot to the directional solidification furnace and control the vacuum degree to 1×10⁻⁶. -3 Pa was heated to 1500℃ and held for 2 hours. The solidification rate was 5 mm / h, with an axial temperature gradient of 12℃ / cm. The ratio of axial temperature gradient to solidification rate was controlled at 0.24℃・h / mm. 2 The solidified material is subjected to directional solidification treatment. After solidification, it is cooled to 500°C at a rate of 30°C / min to obtain a directional solidified ingot. Step 4: Place the directional solidification ingot in an argon atmosphere, hold it at 1150℃ for 4 hours, cool it to room temperature by water quenching, raise the temperature to 850℃ at a heating rate of T=8.13℃ / min, hold it for 4 hours, lower the temperature to 750℃ at a cooling rate of 1℃ / min, hold it for 16 hours, and then age it to obtain a high-temperature resistant nickel oxide-based alloy material.

[0034] Comparative Example 6 A high-temperature resistant nickel oxide-based alloy material, whose chemical composition by mass percentage includes: Cr: 12.0%, Co: 9.0%, W: 4.5%, Mo: 1.5%, Al: 5.5%, Y: 0.2%, La: 0.1%, Nb: 1.5%, with the balance being Ni and unavoidable impurities.

[0035] A method for preparing a high-temperature resistant nickel oxide-based alloy material includes the following preparation steps: Step 1: Prepare the ingredients according to the above composition and carry out a segmented melting process in a vacuum induction furnace. After slag removal and deoxidation, a molten alloy liquid is obtained. The segmented melting process is controlled as follows: heat up to 1650℃ at a rate of 8℃ / min, add Ni, W and Mo first, and hold for 40min; heat up to 1700℃ at a rate of 3℃ / min, then add Cr, Co and Nb, and hold for 20min; cool down to 1550℃ at a rate of 5℃ / min, add Al, Y and La, and hold for 10min. Step 2: Cool the molten alloy liquid to 1400°C at a cooling rate of 5°C / min, then pour it into a graphite mold preheated to 800°C, and allow it to cool naturally to room temperature to obtain an ingot. Step 3: Add the ingot to the directional solidification furnace and control the vacuum degree to 1×10⁻⁶. -3 Pa, heated to 1500℃ and held for 2 hours, with an axial temperature gradient of 12℃ / cm and a solidification rate of 8mm / h, the ratio of axial temperature gradient to solidification rate was controlled at 0.15℃・h / mm. 2 The solidified material is subjected to directional solidification treatment. After solidification, it is cooled to 500°C at a rate of 30°C / min to obtain a directional solidified ingot. Step 4: Place the directional solidification ingot in an argon atmosphere, hold it at 1150℃ for 4 hours, cool it to room temperature by water quenching, raise the temperature to 850℃ at a heating rate of T=8.13℃ / min, hold it for 4 hours, lower the temperature to 750℃ at a cooling rate of 1℃ / min, hold it for 16 hours, and then age it to obtain a high-temperature resistant nickel oxide-based alloy material.

[0036] Comparative Example 7 A high-temperature resistant nickel oxide-based alloy material, whose chemical composition by mass percentage includes: Cr: 12.0%, Co: 9.0%, W: 4.5%, Mo: 1.5%, Al: 5.5%, Y: 0.2%, La: 0.1%, Nb: 1.5%, with the balance being Ni and unavoidable impurities.

[0037] A method for preparing a high-temperature resistant nickel oxide-based alloy material includes the following preparation steps: Step 1: Prepare the ingredients according to the above composition and carry out a segmented melting process in a vacuum induction furnace. After slag removal and deoxidation, a molten alloy liquid is obtained. The segmented melting process is controlled as follows: heat up to 1650℃ at a rate of 8℃ / min, add Ni, W and Mo first, and hold for 40min; heat up to 1700℃ at a rate of 3℃ / min, then add Cr, Co and Nb, and hold for 20min; cool down to 1550℃ at a rate of 5℃ / min, add Al, Y and La, and hold for 10min. Step 2: Cool the molten alloy liquid to 1400°C at a cooling rate of 5°C / min, then pour it into a graphite mold preheated to 800°C, and allow it to cool naturally to room temperature to obtain an ingot. Step 3: Add the ingot to the directional solidification furnace and control the vacuum degree to 1×10⁻⁶. -3 Pa was heated to 1500℃ and held for 2 hours. The solidification rate was 5 mm / h, with an axial temperature gradient of 12℃ / cm. The ratio of axial temperature gradient to solidification rate was controlled at 0.24℃・h / mm. 2 The solidified material is subjected to directional solidification treatment. After solidification, it is cooled to 500°C at a rate of 30°C / min to obtain a directional solidified ingot. Step 4: Place the directional solidification ingot in an argon atmosphere, hold it at 1150℃ for 4 hours, cool it to room temperature by water quenching, raise the temperature to 850℃ at a heating rate of T=3℃ / min, hold it for 4 hours, lower the temperature to 750℃ at a cooling rate of 1℃ / min, hold it for 16 hours, and then age it to obtain a high-temperature resistant nickel oxide-based alloy material.

[0038] Performance testing The performance of the high-temperature nickel oxide-based alloy materials prepared in Examples 1-3 and Comparative Examples 1-7 of this application was tested, as follows: Hardness: Tested in accordance with national standard GB / T 4340.1-2024 "Metallic materials - Vickers hardness test - Part 1: Test method"; Tensile strength, yield strength and elongation: tested at a high temperature of 1200℃, in accordance with the national standard GB / T 4338-2006 "Metallic Materials - High Temperature Tensile Testing Method"; Weight loss rate: Tested using a thermogravimetric analyzer at a high temperature of 1400℃, referring to industry standard HB 5258-2020 "Test Method for Determination of Oxidation Resistance of Steel and High Temperature Alloys"; The test results are shown in Table 1.

[0039] Table 1. Performance parameters of the high-temperature resistant nickel oxide-based alloy materials prepared in Examples 1-3 and Comparative Examples 1-7 As shown in Table 1, the high-temperature nickel oxide-based alloy material prepared in this application exhibits excellent mechanical properties, high hardness, and outstanding tensile and yield strength. It can stably bear loads under high-temperature conditions, effectively preventing fracture or plastic failure due to excessive load. Simultaneously, the material possesses a certain elongation, giving it good plasticity in high-temperature environments, effectively alleviating stress concentration problems and preventing brittle fracture, thus significantly improving its stability during high-temperature service. Furthermore, this alloy material also exhibits excellent weather resistance and durability, with extremely strong high-temperature oxidation resistance. Even when exposed to high-temperature oxidizing environments for extended periods, it is not easily corroded or peeled off, maintaining its structural integrity and performance stability, thereby significantly extending its service life and effectively reducing maintenance costs in high-temperature applications.

[0040] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A high-temperature resistant nickel oxide-based alloy material, characterized in that, Its chemical composition by mass percentage Includes: Cr: 12.0-18.0%, Co: 8.0-12.0%, W: 4.5-6.5%, Mo: 1.5-2.5%, Al: 5.5-6.5%, Y+La: 0.1-0.3%, Nb: 1.5-3.2%, with the balance being Ni and unavoidable impurities.

2. The high-temperature resistant nickel oxide-based alloy material according to claim 1, characterized in that, The chemical components also satisfy the following quantitative relationships: 2.0≤[Al] / [Nb]≤4.0, 0.6≤[Y] / ([Y+La])≤0.7, 1.5≤[Co] / ([W]+[Mo])≤3.0; where [Al], [Nb], [Y], [Y+La], [Co], [W] and [Mo] are the mass percentage contents of Al, Nb, Y, Y+La, Co, W and Mo, respectively.

3. A method for preparing a high-temperature resistant nickel oxide-based alloy material as described in any one of claims 1 or 2, characterized in that, The preparation steps include the following: Step 1: Prepare the ingredients according to the above composition, carry out the segmented melting process in a vacuum induction furnace, and after slag removal and deoxidation, obtain molten alloy liquid; Step 2: Cool the molten alloy liquid to 1400-1450℃, then pour it into a graphite mold preheated to 800-900℃, and let it cool naturally to room temperature to obtain an ingot; Step 3: Add the ingot to the directional solidification furnace and heat it to 1500-1550℃. After holding it at that temperature for 2-3 hours, perform directional solidification. After solidification, cool it to 500-600℃ to obtain the directional solidified ingot. Step 4: Place the directional solidification ingot in an inert gas atmosphere and hold it at 1150-1200℃ for 4-6 hours. Then, quench it in water to room temperature and aging it to obtain a high-temperature nickel oxide-based alloy material.

4. The method for preparing the high-temperature resistant nickel oxide-based alloy material according to claim 3, characterized in that, The segmented smelting process in step 1 is as follows: heat to 1650-1700℃ at a rate of 8-10℃ / min, add Ni, W, and Mo first, and hold for 40-50 min; heat to 1700-1750℃ at a rate of 3-5℃ / min, then add Cr, Co, and Nb, and hold for 20-30 min; cool to 1550-1600℃ at a rate of 5-10℃ / min, add Al, Y, and La, and hold for 10-15 min.

5. The method for preparing the high-temperature resistant nickel oxide-based alloy material according to claim 3, characterized in that, In step 2, the molten alloy liquid is cooled to 1400-1450℃ at a cooling rate of 5-7℃ / min.

6. The method for preparing the high-temperature resistant nickel oxide-based alloy material according to claim 3, characterized in that, The working parameters for directional solidification in step 3 are: axial temperature gradient of 12-15℃ / cm and solidification rate of 5-8mm / h.

7. The method for preparing the high-temperature resistant nickel oxide-based alloy material according to claim 6, characterized in that, The ratio of the axial temperature gradient to the solidification rate is 0.2-0.3℃·h / mm. 2 .

8. The method for preparing the high-temperature resistant nickel oxide-based alloy material according to claim 3, characterized in that, The aging process in step 4 is as follows: heat to 850-900℃ at a heating rate of T℃ / min, hold for 4-6 hours, and then cool to 750-800℃ at a cooling rate of 1-5℃ / min, hold for 16-20 hours.

9. The method for preparing the high-temperature resistant nickel oxide-based alloy material according to claim 8, characterized in that, In the process of heating to 850-900℃ at a heating rate of T℃ / min, T = 5.2 + 0.8 × [Al] / [Nb], where [Al] and [Nb] are the mass percentage contents of Al and Nb, respectively.

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