CN113718151A - Nano composite oxide dispersion strengthening molybdenum alloy and preparation method thereof - Google Patents
Nano composite oxide dispersion strengthening molybdenum alloy and preparation method thereof Download PDFInfo
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- 229910001182 Mo alloy Inorganic materials 0.000 title claims abstract description 44
- 239000002114 nanocomposite Substances 0.000 title claims abstract description 32
- 238000005728 strengthening Methods 0.000 title claims abstract description 15
- 239000006185 dispersion Substances 0.000 title claims abstract description 13
- 238000002360 preparation method Methods 0.000 title abstract description 13
- 239000000843 powder Substances 0.000 claims abstract description 48
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims abstract description 35
- 229910001175 oxide dispersion-strengthened alloy Inorganic materials 0.000 claims abstract description 33
- 239000002131 composite material Substances 0.000 claims abstract description 26
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 26
- 239000011733 molybdenum Substances 0.000 claims abstract description 26
- 239000011159 matrix material Substances 0.000 claims abstract description 19
- 229910001093 Zr alloy Inorganic materials 0.000 claims abstract description 12
- 238000000713 high-energy ball milling Methods 0.000 claims abstract description 11
- 238000002490 spark plasma sintering Methods 0.000 claims abstract description 9
- 239000006104 solid solution Substances 0.000 claims abstract description 7
- 239000012300 argon atmosphere Substances 0.000 claims abstract description 4
- 238000007670 refining Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 22
- 238000000498 ball milling Methods 0.000 claims description 15
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 14
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 9
- 238000005245 sintering Methods 0.000 claims description 8
- 229910052786 argon Inorganic materials 0.000 claims description 7
- 238000004806 packaging method and process Methods 0.000 claims description 7
- 239000012298 atmosphere Substances 0.000 claims description 6
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- 229910002651 NO3 Inorganic materials 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C27/00—Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
- C22C27/04—Alloys based on tungsten or molybdenum
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/105—Sintering only by using electric current other than for infrared radiant energy, laser radiation or plasma ; by ultrasonic bonding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/05—Mixtures of metal powder with non-metallic powder
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/001—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides
- C22C32/0015—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides with only single oxides as main non-metallic constituents
- C22C32/0031—Matrix based on refractory metals, W, Mo, Nb, Hf, Ta, Zr, Ti, V or alloys thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/105—Sintering only by using electric current other than for infrared radiant energy, laser radiation or plasma ; by ultrasonic bonding
- B22F2003/1051—Sintering only by using electric current other than for infrared radiant energy, laser radiation or plasma ; by ultrasonic bonding by electric discharge
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
- B22F2009/041—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by mechanical alloying, e.g. blending, milling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
- B22F2009/043—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by ball milling
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention discloses a nano composite oxide dispersion strengthening molybdenum alloy and a preparation method thereof, belonging to the field of refractory metal matrix composite materials. With molybdenum metal powder, Y2O3Powder and Mo2Zr alloy element powder is used as a raw material, alloy components are uniformly mixed and packaged according to a proportion, and Y is subjected to high-energy ball milling in a high-purity argon atmosphere2O3And dissolving the nano-Zr-Y-O composite oxide and Zr in a molybdenum matrix in a solid solution to prepare composite powder, and then solidifying the powder through spark plasma sintering to precipitate the nano-Zr-Y-O composite oxide to prepare the nano-composite oxide dispersion strengthened molybdenum alloy.The invention utilizes Y2O3The solid solution re-precipitation mechanism comprises the steps of adding Zr element, Y element and free oxygen to react to form Zr-Y-O composite oxide with a fluorite structure, and refining oxide particles to 5-30 nm while removing free oxygen of a molybdenum substrate; and the oxide particles precipitated in situ and the molybdenum matrix have a coherent/semi-coherent relationship, and are mostly distributed in the crystal grains, so that the precipitation strengthening effect is achieved, and the mechanical property and the radiation resistance can be obviously improved.
Description
Technical Field
The invention belongs to the field of refractory metal matrix composite materials, and particularly relates to a preparation method of an Oxide Dispersion-Strengthened (ODS) molybdenum alloy.
Background
Molybdenum and its alloy have high melting point, low expansion coefficient, excellent high-temperature mechanical property and outstanding radiation resistance, and are widely used as high-temperature structural materials, such as electrodes for melting glass, rocket nozzles, nuclear reactor fuel cladding and the like. But the problems of room temperature brittleness, recrystallization brittleness, low high-temperature strength, radiation-induced embrittlement and the like seriously affect the processing and service performance of the alloy. In order to improve the mechanical properties, solute elements, carbides or oxides are usually introduced to dispersion strengthen the molybdenum grains and grain boundaries. Among them, the oxide dispersion strengthened molybdenum alloy attracts great attention and attention due to the excellent thermal stability and obvious grain refinement of the oxide. In addition, the uniform and fine distribution of the oxide is the key for ensuring that the oxide dispersion strengthened molybdenum alloy has excellent mechanical property, radiation resistance and processability. The difficulty in preparing the oxide dispersion strengthened molybdenum alloy lies in how to uniformly disperse and distribute the nano oxide in the molybdenum matrix.
The existing process technology for preparing oxide dispersion strengthened molybdenum alloy mainly combines the preparation of composite powder by a ball milling method and a wet chemical method (a sol-gel method, a spray drying method and a hydrothermal co-reduction method) with powder metallurgy, taking the sol-gel method as an example, and the main preparation process steps are as follows: ammonium tetramolybdate, citric acid and nitrate are used as precursors, and are mixed under the condition of liquid phase, gel with a grid structure is formed after a series of hydrolysis and condensation chemical reactions, and the obtained gel is dried, powdered, cured and sintered to prepare the oxide dispersion strengthened molybdenum alloy.
However, in the oxide dispersion strengthened molybdenum alloy prepared by the powder prepared by the wet chemical method or the ball milling method and subjected to high-temperature sintering and hot working deformation, the size of oxide particles is mostly micron (1-10 μm), the oxide particles do not have crystallographic relationship with a matrix, the due strengthening effect is lost, stress concentration is even caused to crack, and the ductility of the material is finally influenced. Meanwhile, the existence of free oxygen in the molybdenum powder at the grain boundary can cause the brittleness of the grain boundary.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a nano composite oxide dispersion strengthened molybdenum alloy and a preparation method thereof, so as to solve the technical problems that the size of an oxide is large and oxygen elements are segregated in a grain boundary in the preparation of the existing oxide dispersion strengthened molybdenum alloy.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
the invention discloses a nano composite oxide dispersion strengthening molybdenum alloy, which comprises the following components in percentage by mass: 1% -2% of Y2O30.3 to 1.2 percent of Zr, and the balance of molybdenum and inevitable impurities.
The invention also discloses a preparation method of the nano composite oxide dispersion strengthening molybdenum alloy, which comprises the following steps:
1) adding Y into molybdenum metal element powder2O3As oxide dispersed phase, Mo is added2Zr alloy element powder is used as the source of dispersed phase refining element Zr, molybdenum metal element powder and Y2O3And Mo2Uniformly mixing and packaging Zr alloy element powder according to the component proportion;
2) in a high-purity protective atmosphere, adopting high-energy ball milling to mix Y2O3Dissolving the powder and Zr in a molybdenum matrix in a solid solution manner to prepare composite powder;
3) and solidifying the composite powder by adopting spark plasma sintering to precipitate the nano Zr-Y-O composite oxide, thus obtaining the nano composite oxide dispersion strengthening molybdenum alloy.
Preferably, in step 1), the hybrid packaging is performed in a glove box filled with argon gas.
Preferably, in the step 2), the high-purity protective atmosphere is an argon atmosphere with a purity of 99.999% or more.
Preferably, in the step 2), the material of the ball milling tank and the grinding balls used in the high-energy ball milling is zirconia, the material-ball ratio is 1:10, the rotating speed is 250-450 rad/min, and the total ball milling time is 12-48 h.
Further preferably, during the high energy ball milling: stopping the ball mill for 2 hours every time, reversing once, and circulating in sequence until the total ball milling time is reached.
Preferably, in the step 3), the temperature of the spark plasma sintering is 1300-1500 ℃, and the heat preservation time is 5 min.
Further preferably, the heating rate is 100 ℃/min and the sintering pressure is 30-60 MPa in the discharge plasma sintering process.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a nano composite oxide dispersion strengthening molybdenum alloy, which comprises the following components: 1% -2% of Y2O3Compared with the alloy composition components in the prior art, the precipitated oxide type is a nano-scale composite oxide which is coherent with the matrix, the formula has excellent creep resistance and irradiation resistance, and can greatly improve the high-temperature mechanical property, the high-temperature creep resistance and the irradiation resistance of the molybdenum alloy.
The invention discloses a preparation method of a nanometer composite oxide dispersion strengthening molybdenum alloy, which is characterized in that Y is subjected to mechanical alloying2O3The oxide dispersion phase and the dispersed phase refining element Zr are supersaturated and dissolved in the molybdenum matrix, and then the nano composite oxide which is coherent or semi-coherent with the matrix is precipitated in situ through spark plasma sintering, so that the coherent strengthening effect is achieved, and the strength is greatly improved while the ductility and toughness of the nano composite oxide are not damaged. In the process, the added Zr element reacts with the Y element and the free oxygen to form Zr-Y-O composite oxide with fluorite structure, and the size of the oxide is reduced and improved while the free oxygen of the molybdenum substrate is removedThe number density of oxide particles is improved, the distribution and high-temperature stability of the oxide are improved, and the oxide particles are thinned to 5-30 nm; and the oxide particles precipitated in situ and the molybdenum matrix have a coherent/semi-coherent relationship, and are mostly distributed in the crystal grains, so that the precipitation strengthening effect is achieved, and the mechanical property and the radiation resistance can be obviously improved. At the same time, Mo is added2The Zr alloy element powder can improve the oxygen content of the molybdenum alloy capable of being oxide dispersion strengthened, has strong chemical stability compared with the Zr metal element powder, and is more beneficial to controlling the oxygen content of the molybdenum alloy capable of being oxide dispersion strengthened.
Drawings
FIG. 1 is a typical microstructure picture of a nanocomposite oxide dispersion-strengthened molybdenum alloy; wherein, (a) is BF diagram; (b) is a HAADF diagram.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following will clearly and completely describe the technical solution of the present invention with reference to the specific embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terms first, second and the like in the description and in the claims of the present invention are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
example 1
The nano composite oxide dispersion strengthened molybdenum alloy of the embodiment comprises 1% of Y by mass2O30.6% of Zr, and the balance molybdenum and inevitable impurities.
The preparation method of the nano composite oxide dispersion strengthened molybdenum alloy comprises the following steps:
1) mixing molybdenum metal element powder, Y2O3Powder and Mo2Weighing Zr alloy element powder according to a component proportion, then putting the Zr alloy element powder and grinding balls with the diameter of 10mm into a 250mL ball-milling tank made of zirconia, wherein the material-ball ratio is 1:10, and mixing and packaging the powder in a glove box filled with high-purity argon.
2) Ball-milling the mixed powder for 30h at the rotating speed of 300rad/min under the atmosphere of high-purity argon, stopping the machine for 1h and reversing once every 2h for avoiding powder agglomeration caused by overheating, circulating in sequence, and carrying out high-energy ball milling on Y2O3Dissolving Zr in molybdenum matrix to prepare supersaturated solid solution powder of molybdenum matrix;
3) and solidifying the composite powder subjected to the high-energy ball milling by adopting spark plasma sintering, keeping the temperature at 1400 ℃ for 5min, heating the temperature at a rate of 100 ℃/min, and cooling the sintering pressure at 45MPa along with a furnace to separate out the nano Zr-Y-O composite oxide, thereby obtaining the nano composite oxide dispersion strengthened molybdenum alloy.
In the nano composite oxide dispersion strengthened molybdenum alloy prepared by the embodiment, the Zr-Y-O composite oxide precipitated in situ is uniformly dispersed in the molybdenum matrix, the average grain diameter is 20.32nm, and the number density is as high as 3.09 multiplied by 1013m-2The strength and the hardness of the alloy are both greatly improved. Results see figure 1 for a typical microstructure picture (BF vs HAADF graph) of an oxide dispersion strengthened molybdenum alloy.
Example 2
The nano composite oxide dispersion strengthened molybdenum alloy of the embodiment comprises 2% of Y by mass2O30.6% of Zr, and the balance molybdenum and inevitable impurities.
The preparation method of the nano composite oxide dispersion strengthened molybdenum alloy comprises the following steps:
1) mixing molybdenum metal element powder, Y2O3Powder and Mo2Weighing Zr alloy element powder according to a component proportion, then putting the Zr alloy element powder and grinding balls with the diameter of 10mm into a 250mL ball-milling tank made of zirconia, wherein the material-ball ratio is 1:10, and mixing and packaging the powder in a glove box filled with high-purity argon.
2) And in a high-purity argon atmosphere, ball-milling the mixed powder for 48 hours at a rotating speed of 200rad/min, stopping the machine for 1 hour and reversing once every 2 hours of operation in order to avoid powder agglomeration caused by overheating, and sequentially circulating. Milling Y by high energy ball mill2O3Dissolving Zr in molybdenum matrix to prepare supersaturated solid solution powder of molybdenum matrix;
3) and solidifying the composite powder subjected to the high-energy ball milling by adopting spark plasma sintering, keeping the temperature at 1300 ℃ for 5min, heating the temperature at a rate of 100 ℃/min and sintering the pressure at 60MPa, and cooling the powder along with a furnace to separate out the nano Zr-Y-O composite oxide to obtain the nano composite oxide dispersion-strengthened molybdenum alloy.
In the nano composite oxide dispersion strengthened molybdenum alloy prepared by the embodiment, most of Zr-Y-O composite oxides precipitated in situ are uniformly dispersed in molybdenum grains, the average grain diameter is 18.09nm, and the number density is as high as 3.54 multiplied by 1013m-2The strength is obviously improved by more than 150 percent compared with commercial pure molybdenum.
Example 3
The nano composite oxide dispersion strengthened molybdenum alloy of the embodiment comprises 1% of Y by mass2O31.2% of Zr, and the balance of molybdenum and inevitable impurities.
The preparation method of the nano composite oxide dispersion strengthened molybdenum alloy comprises the following steps:
1) mixing molybdenum metal element powder, Y2O3Powder and Mo2Weighing Zr alloy element powder according to a component proportion, then putting the Zr alloy element powder and grinding balls with the diameter of 10mm into a 250mL ball-milling tank made of zirconia, wherein the material-ball ratio is 1:10, and mixing and packaging the powder in a glove box filled with high-purity argon.
2) And under the atmosphere of high-purity argon, ball-milling the mixed powder for 12h at the rotating speed of 400rad/min, stopping the machine for 1h and reversing once every 2h for avoiding powder agglomeration caused by overheating, and circulating sequentially. Milling Y by high energy ball mill2O3Dissolving Zr in molybdenum matrix to prepare supersaturated solid solution powder of molybdenum matrix;
3) and solidifying the composite powder subjected to the high-energy ball milling by adopting spark plasma sintering, keeping the temperature at 1500 ℃ for 5min, heating the temperature at a rate of 100 ℃/min, and cooling the sintering pressure at 30MPa along with a furnace to separate out the nano Zr-Y-O composite oxide, thereby obtaining the nano composite oxide dispersion-strengthened molybdenum alloy.
In the nano composite oxide dispersion strengthened molybdenum alloy prepared by the embodiment, most of Zr-Y-O composite oxides precipitated in situ are uniformly dispersed in molybdenum grains, the average grain diameter is 24.13nm, and the number density is as high as 3.47 multiplied by 1013m-2The radiation resistance of the material is obviously improved, the self-healing capability of intrinsic defects is improved, and the density of internal residual defects is reduced.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (8)
1. A nanometer composite oxide dispersion strengthening molybdenum alloy is characterized by comprising the following components in percentage by mass: 1% -2% of Y2O30.3 to 1.2 percent of Zr, and the balance of molybdenum and inevitable impurities.
2. The method for preparing the nano composite oxide dispersion-strengthened molybdenum alloy as claimed in claim 1, characterized by comprising the steps of:
1) adding Y into molybdenum metal element powder2O3As oxide dispersed phase, Mo is added2Zr alloy element powder is used as the source of dispersed phase refining element Zr, molybdenum metal element powder and Y2O3And Mo2Uniformly mixing and packaging Zr alloy element powder according to the component proportion;
2) in a high-purity protective atmosphere, adopting high-energy ball milling to mix Y2O3Dissolving the powder and Zr in a molybdenum matrix in a solid solution manner to prepare composite powder;
3) and solidifying the composite powder by adopting spark plasma sintering to precipitate the nano Zr-Y-O composite oxide, thus obtaining the nano composite oxide dispersion strengthening molybdenum alloy.
3. The method for preparing a nanocomposite oxide dispersion-strengthened molybdenum alloy according to claim 2, wherein in the step 1), the mixing and packaging are performed in a glove box filled with argon gas.
4. The method for preparing a nanocomposite oxide dispersion-strengthened molybdenum alloy according to claim 2, wherein in the step 2), the high-purity protective atmosphere is an argon atmosphere having a purity of 99.999% or more.
5. The method for preparing the nano composite oxide dispersion strengthening molybdenum alloy according to claim 2, wherein in the step 2), the material of a ball milling tank and a ball milling ball used for high-energy ball milling is zirconia, the material-ball ratio is 1:10, the rotating speed is 250 to 450rad/min, and the total ball milling time is 12 to 48 hours.
6. The method for preparing the nanocomposite oxide dispersion-strengthened molybdenum alloy according to claim 5, wherein in the high-energy ball milling process: stopping the ball mill for 2 hours every time, reversing once, and circulating in sequence until the total ball milling time is reached.
7. The method for preparing the nano composite oxide dispersion-strengthened molybdenum alloy according to claim 2, wherein in the step 3), the temperature of the spark plasma sintering is 1300-1500 ℃, and the holding time is 5 min.
8. The method for preparing the nano composite oxide dispersion-strengthened molybdenum alloy according to claim 7, wherein the temperature rise rate is 100 ℃/min and the sintering pressure is 30-60 MPa in the discharge plasma sintering process.
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