A method for producing an atomically oxide dispersed strengthened alloy and use thereof

Abstract

The application relates to the technical field of alloy preparation, and particularly discloses a preparation method and application of an atomic-level oxide dispersion strengthened alloy, which comprises the following steps: atomic-level metal Y cluster powder is placed into an oxidation device for oxidation treatment to obtain atomic-level Y2O3 cluster powder; a certain amount of alloy powder is weighed, mixed with the atomic-level Y2O3 cluster powder prepared in S1, and fully mixed by using a sound resonance device to obtain alloyed powder; and the alloyed powder in S2 is pressed and formed by using a hot-pressing sintering device to obtain the atomic-level oxide dispersion strengthened alloy; through the accurate preparation of the atomic-level Y cluster powder and the atomic-level Y2O3 cluster powder in the early stage, the atomic-level oxide dispersion strengthened alloy can be efficiently prepared; the atomic-level oxide dispersion strengthened alloy solves the core technical problems that oxide dispersion phases are prone to agglomeration and unevenly distributed in the matrix in the traditional technology, and the preparation quality and performance stability of the atomic-level oxide dispersion strengthened alloy are significantly improved.

Description

Technical Field

[0001] This invention belongs to the field of alloy preparation technology, specifically relating to a method for preparing atomic-level oxide dispersion strengthened alloys and their applications. Background Technology

[0002] Oxide dispersion strengthened alloys are produced by incorporating fine, stable, and uniformly distributed oxide dispersions into the alloy matrix. These dispersions pin dislocations and hinder grain boundary migration, significantly improving the material's high-temperature strength, creep resistance, and corrosion resistance. They are widely used in the manufacturing of core components for high-end equipment in aerospace, nuclear energy, and other power industries. The size and dispersion uniformity of the oxide dispersion are the core factors determining the performance of this type of alloy; the smaller the size and the more uniform the distribution of the dispersion, the more significant the strengthening effect on the alloy.

[0003] In existing technologies, the introduction of oxide dispersed phases is a key path to improve the strength and toughness of alloys, but there are still many bottlenecks that need to be overcome: On the one hand, existing preparation processes are difficult to stably control the particle size of oxide dispersed phases at the atomic level (<10nm), and dispersed phases are prone to agglomeration, resulting in uneven distribution in the alloy matrix and failing to fully exert the dispersion strengthening effect of oxides; on the other hand, existing technologies mostly use mechanical alloying methods (such as high-energy ball milling) to introduce dispersed phases. Such processes are not only prone to introducing external impurities, but may also cause excessive refinement of alloy powder grains, which can easily damage the toughness of the material; therefore, the development of a preparation method that can stably prepare atomic-sized oxide dispersed phases and achieve uniform dispersion of them in the alloy matrix has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0004] The purpose of this invention is to provide a method for preparing atomically dispersed oxide-reinforced alloys to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A method for preparing an atomically dispersed oxide dispersion-strengthened alloy, comprising:

[0007] Includes the following steps:

[0008] S1. Place atomic-level metal Y cluster powder (referring to ultrafine metal cluster powder with metal yttrium (Y) as the core component) into an oxidation device for oxidation treatment to obtain atomic-level Y2O3 cluster powder;

[0009] S2. Weigh out a certain amount of alloy powder and mix it with the atomic-level Y2O3 cluster powder prepared in S1. Use an acoustic resonance device to fully mix the mixture to obtain alloyed powder.

[0010] S3. The alloying powder in S2 is pressed into shape using a hot pressing sintering device to obtain an atomic-level oxide dispersion reinforced alloy.

[0011] Preferably, the atomic-level metallic Y cluster powder in S1 has a particle size of 4~6nm, the number of atoms in a single cluster powder particle is less than 1000, the oxygen content by mass fraction is less than 1%, and the metal purity is higher than 99.9%.

[0012] Preferably, the gas used in the oxidation device in S1 is a mixture of argon and oxygen, wherein the oxygen content is 0.1%~0.5% and the gas flow rate is 0.5~1.5m³. 3 / h, oxidation time is 4~8h.

[0013] Preferably, the atomic-level Y2O3 cluster powder in S1 has a particle size of <10nm.

[0014] Preferably, the alloy powder in S2 includes a matrix element and an alloying element. The matrix element includes at least one of Fe, Ni, Al, Cu, and Ti, and the alloying element includes at least one of Cr, Al, Ti, W, Mo, Co, Ta, Nb, Mg, Cu, and Zr.

[0015] Preferably, the amount of atomic-level Y2O3 cluster powder added to the alloy powder in S2 is 0.1~5wt%.

[0016] Preferably, the operating parameters for the acoustic resonance device in S2 are: vibration frequency of 10~60Hz, acceleration of 10~80g, and mixing time of 30~50min.

[0017] Preferably, the operating parameters of the hot pressing sintering equipment in S3 are: heating rate of 5~20℃ / min, pressure of 20~100MPa, sintering temperature of 500~1700℃, and holding time of 1~3h.

[0018] Preferably, the particle size of the second phase Y2O3 oxide dispersion strengthening phase in the S3 atomic-level oxide dispersion strengthened alloy is <10nm, and it is uniformly distributed in the alloy matrix without obvious agglomeration.

[0019] Preferably, the atomic-level oxide dispersion-strengthened alloy prepared by the above method is used in the field of manufacturing core components for high-end equipment such as aerospace, nuclear energy, and power.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] This invention achieves efficient preparation of atomic-level oxide dispersion-strengthened alloys by precisely preparing atomic-level Y cluster powder and Y2O3 cluster powder in the early stage, combined with acoustic resonance uniform mixing process and adaptive mixing control of alloy powders. The method provided by this invention fundamentally solves the core technical problem of easy agglomeration of oxide dispersion phases and uneven distribution in the matrix in traditional technology, and significantly improves the preparation quality and performance stability of oxide dispersion-strengthened alloys. Attached Figure Description

[0022] Figure 1 This is a flowchart of the present invention;

[0023] Figure 2 This is a transmission electron micrograph of the oxide dispersion phase (Y2O3) obtained in an embodiment of the present invention;

[0024] Figure 3 This is a scanning electron microscope image showing the uniform distribution of atomic-level oxide dispersed phase (Y2O3) in stainless steel obtained in an embodiment of the present invention. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Example 1:

[0027] Please see Figures 1-3 As shown, a method for preparing an atomically dispersed oxide dispersion-strengthened alloy includes the following steps:

[0028] S1: Atomic-scale metallic Y cluster powder with a particle size of 4-6 nm (purity not less than 99.9%) is placed in an oxidation device for oxidation treatment. A mixture of argon and oxygen is introduced, with an oxygen content of 0.5% and a gas flow rate of 1 m³ / s. 3 The oxidation time was 5 hours, and Y2O3 cluster powder was obtained. The specific surface area test (BET) results showed that the particle size of the Y2O3 cluster powder was 7.85 nm.

[0029] like Figure 2 As shown in the transmission electron micrograph of Y2O3, it can be seen from the figure that the average particle size of Y2O3 prepared in S2 is less than 10 nm.

[0030] S2: Stainless steel micron cluster powder with the following composition: Cr: 16.91wt%, Ni: 10.48wt%, Mo: 2.18wt%, Mn: 0.93wt%, Si: 0.88wt%, C: 0.03wt%, S: 0.002wt%, and the balance being Fe, and Y2O3 cluster powder prepared by S2 were weighed at a mass ratio of 99.5:0.5 and placed in the container of an acoustic resonance device. The vibration frequency was 55Hz, the acceleration was 80g, and acoustic resonance mixing was carried out under an inert atmosphere. The mixing time was 30min. To avoid excessive temperature due to excessive mixing time, the powder mixing was divided into 5 stages: the first stage was 10min of mixing, the second stage was paused for 10min, the third stage was 10min of mixing, the fourth stage was paused for 10min, and the fifth stage was 10min of mixing to obtain alloyed powder.

[0031] like Figure 3 The image shows a scanning electron microscope image of the uniform distribution of atomic-level oxide dispersed phase (Y2O3) in stainless steel. It can be seen from the image that after acoustic resonance treatment in S3, the Y2O3 cluster powder is uniformly coated on the stainless steel particles, and the sphericity of the particles is maintained.

[0032] S3: The alloyed powder is pressed into shape by hot pressing sintering equipment. The selected heating rate is 10℃ / min, the pressure is 50MPa, the sintering temperature is 1100℃, and the holding time is 1h, finally obtaining the atomic-level oxide dispersion strengthened alloy.

[0033] The alloy prepared by this method has oxide dispersion phase particles with a particle size of less than 10 nm and uniform distribution in the alloy matrix, which can significantly improve the strength and toughness of the material. This provides technical support for the performance optimization and application expansion of oxide dispersion strengthened alloys. The prepared alloys can be widely used in the manufacturing of core components for high-end equipment such as aerospace, nuclear energy, and power.

[0034] The key to this invention lies in the precise preparation of atomic-level Y cluster powder and Y2O3 cluster powder, the application of acoustic resonance uniform mixing process, and the compatibility mixing control of alloy powder. The particle size of atomic-level metallic Y cluster powder is controlled at 4~6nm, and the purity is not less than 99.9%. Using atomic-level metallic Y cluster powder as raw material, atomic-level Y2O3 cluster powder is directly obtained through oxidation treatment under controllable process parameters using an oxidation device. This avoids the agglomeration of dispersed phases from the source and ensures that the particle size of the dispersed phase is controlled below 10 nm. The core advantage of choosing atomic-level metallic Y powder as raw material lies in the high chemical activity of Y at the atomic scale, which easily reacts with oxygen to generate stable Y2O3. Furthermore, the atomic-level particle size ensures that the subsequent oxidation products maintain an atomic scale. Acoustic resonance equipment is used to replace the traditional high-energy ball milling process. The high-frequency resonance effect promotes the full penetration of atomic-level Y2O3 cluster powder into the surface and gaps of the alloy powder, achieving uniform dispersion of the dispersed phase in the matrix. At the same time, it effectively avoids the drawbacks of traditional ball milling processes, such as the introduction of impurities and excessive refinement of powder grains. By precisely controlling the ratio of atomic-level Y2O3 cluster powder to alloy powder, the strengthening effect of the dispersed phase and the toughness requirements of the matrix can be balanced, thereby optimizing the overall performance of the alloy.

[0035] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for preparing an atomically dispersed oxide dispersion-strengthened alloy, characterized in that, Includes the following steps: S1. Place the atomic-level metallic Y cluster powder into an oxidation device for oxidation treatment to obtain atomic-level Y2O3 cluster powder; S2. Weigh out a certain amount of alloy powder and mix it with the atomic-level Y2O3 cluster powder prepared in S1. Use an acoustic resonance device to fully mix the mixture to obtain alloyed powder. S3. The alloying powder in S2 is pressed into shape by hot pressing sintering equipment to obtain an atomic-level oxide dispersion reinforced alloy. The atomic-level metallic Y cluster powder in S1 has a particle size of 4~6 nm, the number of atoms in a single cluster powder particle is less than 1000, the oxygen content by mass fraction is less than 1%, and the metal purity is higher than 99.9%. The gas used in the oxidation device in S1 is a mixture of argon and oxygen, with an oxygen content of 0.1% to 0.5% and a gas flow rate of 0.5 to 1.5 m³. 3 / h, oxidation time 4~8 h; The atomic-level Y2O3 cluster powder in S1 has a particle size of <10 nm; The operating parameters for the acoustic resonance device in S2 are: vibration frequency of 10~60 Hz, acceleration of 10~80 g, and mixing time of 30~50 min.

2. The method for preparing an atomically dispersed oxide dispersion-strengthened alloy according to claim 1, characterized in that: The alloy powder in S2 includes a matrix element and an alloying element. The matrix element includes at least one of Fe, Ni, Al, Cu, and Ti, and the alloying element includes at least one of Cr, Al, Ti, W, Mo, Co, Ta, Nb, Mg, Cu, and Zr.

3. The method for preparing an atomically dispersed oxide dispersion-strengthened alloy according to claim 2, characterized in that: The amount of atomic-level Y2O3 cluster powder added to the alloy powder in S2 is 0.1~5 wt%.

4. The method for preparing an atomically dispersed oxide dispersion-strengthened alloy according to claim 3, characterized in that: The operating parameters selected for the hot pressing sintering equipment in S3 are: heating rate of 5~20 ℃ / min, pressure of 20~100 MPa, sintering temperature of 500~1700 ℃, and holding time of 1~3 h.

5. The method for preparing an atomically dispersed oxide dispersion-strengthened alloy according to claim 4, characterized in that: The second phase Y2O3 oxide dispersion strengthening phase in the S3 atomic-level oxide dispersion strengthening alloy has a particle size of <10 nm and is uniformly distributed in the alloy matrix without obvious agglomeration.

6. The use of the atomic-level oxide dispersion-strengthened alloy prepared according to claim 5, characterized in that: The atomic-level oxide dispersion-strengthened alloy is applied to the manufacturing of core components for aerospace and high-end energy and power equipment.

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