A molybdenum alloy and a preparation method thereof

Abstract

The present invention relates to a molybdenum alloy and a preparation method thereof. The above molybdenum alloy is prepared by sintering a mixed raw material containing Mo, Ta, W, and Ce. The molybdenum alloy includes a matrix phase and a rare earth phase. Among them, the matrix phase accounts for 96% to 98% of the mass of the molybdenum alloy. The matrix phase is an alloy composed of Mo, Ta, and W elements. The content of Ta is 0.1% to 0.8% of the mass of the molybdenum alloy, and the content of W is 0.1% to 0.8% of the mass of the molybdenum alloy. The balance of the molybdenum alloy is molybdenum; the rare earth phase is distributed in the matrix phase, and the rare earth phase is Ce element. Among them, the content of Ce is 1% to 3% of the mass of the molybdenum alloy. The molybdenum alloy prepared by the above ratio has strong hardness and good creep resistance, and can be applied to the preparation of high-temperature components.

Description

Technical Field

[0001] The present invention relates to the technical field of molybdenum alloy production, and particularly relates to a molybdenum alloy and a preparation method thereof. Background Art

[0002] Molybdenum alloy is a non-ferrous alloy composed of molybdenum matrix added with other elements. Molybdenum alloy has good thermal and electrical conductivity and low coefficient of thermal expansion, and is easier to process than tungsten. It can be used as the grid and anode of electron tubes, the supporting material of electric light sources, and for making die-casting and extrusion molds, parts of spacecraft, etc.

[0003] Since molybdenum alloy is widely used in manufacturing structural components, such as heating elements of high-temperature furnaces and semiconductor components, etc., molybdenum alloy is required to have high-temperature creep strength. However, in the prior art, in the preparation of molybdenum alloy, second-phase metal particles, etc. are often doped into it to improve its mechanical properties. However, under high-temperature conditions, the creep resistance strength of this kind of molybdenum alloy decreases compared with that of pure molybdenum, which limits its development in the preparation of high-temperature components. Summary of the Invention

[0004] (1) Technical Problems to be Solved

[0005] In view of the above-mentioned disadvantages and deficiencies of the prior art, the present invention provides a molybdenum alloy and a preparation method thereof, which solve the problem that the creep resistance strength of molybdenum alloy decreases compared with that of pure molybdenum in the preparation process of ammonium molybdate in the prior art.

[0006] (2) Technical Solutions

[0007] In order to achieve the above purpose, the main technical solutions adopted by the present invention include:

[0008] The first aspect of the embodiment of the present invention provides a molybdenum alloy, including:

[0009] A base phase, the base phase occupies 96% - 98% of the mass of the molybdenum alloy, the base phase is an alloy composed of Mo, Ta and W elements, in the molybdenum alloy, the content of Ta is 0.1% - 0.8% of the mass of the molybdenum alloy, the content of W is 0.1% - 0.8% of the mass of the molybdenum alloy, and the balance of the molybdenum alloy is molybdenum;

[0010] A rare earth phase, the rare earth phase is distributed in the base phase, the rare earth phase is Ce element, wherein the content of Ce is 1% - 3% of the mass of the molybdenum alloy.

[0011] Preferably, the molybdenum alloy further includes: impurities, the impurities are distributed in the base phase, the impurities are multiple, the total mass of the multiple impurities does not exceed 0.5% of the mass of the base phase, and the content of each impurity does not exceed 0.05% of the mass of the base phase.

[0012] Preferably, the base phase accounts for 97% - 98% of the mass of the molybdenum alloy. The base phase is an alloy composed of Mo, Ta, and W elements. In the alloy, the content of Ta is 0.1% - 0.5% of the mass of the molybdenum alloy, the content of W is 0.2% - 0.4% of the mass of the molybdenum alloy, and the balance of the molybdenum alloy is molybdenum;

[0013] A rare earth phase, the rare earth phase is distributed in the base phase, the rare earth phase is Ce element, wherein the content of Ce is 0.1% - 0.5% of the mass of the molybdenum alloy.

[0014] The second aspect of the embodiments of the present invention provides a preparation method of a molybdenum alloy, including:

[0015] Mix molybdenum powder, tantalum powder, tungsten powder, cerium dioxide powder, and lanthanum sesquioxide powder until uniform, and press the mixed composite molybdenum powder to obtain a pressed blank;

[0016] Sinter the pressed blank, control the sintering temperature at 1500 - 1800 degrees Celsius, and control the sintering time at 7 - 8h to obtain a molybdenum alloy.

[0017] Preferably, the preparation method of the molybdenum alloy includes: grinding the molybdenum powder, the tantalum powder, the tungsten powder, and the cerium dioxide powder for 6 - 8h, adding a liquid solvent and continuing to grind for 8 - 12h, placing the ground mixture in a drying oven, controlling the drying temperature to be less than 80 °C, and drying to obtain a dry mixture.

[0018] Preferably, the preparation method of the molybdenum alloy further includes: performing a reduction reaction on the dry mixture with a reducing gas.

[0019] Preferably, the reducing gas is hydrogen or carbon monoxide.

[0020] Preferably, during the sintering process, control the sintering environment to be a reducing atmosphere, an inert atmosphere, or a vacuum environment.

[0021] Preferably, the sintering method uses microwave sintering.

[0022] Preferably, the particle sizes of the molybdenum powder, the tantalum powder, the tungsten powder, and the cerium dioxide powder are all not greater than 300 mesh.

[0023] (III) Beneficial effects

[0024] The beneficial effects of the present invention are as follows: A molybdenum alloy is prepared by sintering a mixed raw material containing Mo, Ta, W, and Ce in a certain proportion. The creep rate of the doped molybdenum in the molybdenum alloy prepared by the above proportion of the present invention is lower than that of pure molybdenum. It is not only superior to pure molybdenum but also superior to molybdenum alloys of ceramic oxides. Therefore, the parts made of it can maintain dimensional stability even at high temperatures. In terms of strength and performance, the doped molybdenum shows great superiority at high temperatures, has strong hardness and good creep resistance, and can be applied to various fields such as aerospace, biomedicine, mechatronics, the automotive industry, and daily life. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic flow chart of a preparation method of a molybdenum alloy of the present invention.

[0026] Figure 2 It is a schematic diagram of a creep curve of Example 1 of a molybdenum alloy of the present invention.

[0027] Figure 3 It is a schematic diagram of a creep curve of Example 2 of a molybdenum alloy of the present invention.

[0028] Figure 4 It is a schematic diagram of a creep curve of Example 3 of a molybdenum alloy of the present invention.

[0029] Figure 5 It is a schematic diagram of a creep curve of Example 4 of a molybdenum alloy of the present invention.

[0030] Figure 6 It is a schematic diagram of a creep curve of Comparative Example 1 of a molybdenum alloy of the present invention.

[0031] Figure 7 It is a schematic diagram of a creep curve of Comparative Example 2 of a molybdenum alloy of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0032] In order to better explain the present invention for easy understanding, the present invention will be described in detail below with reference to the accompanying drawings through specific embodiments.

[0033] When an equivalent, concentration, or other value or parameter is expressed as a range, a preferred range, or a range defined by a series of upper preferred values and lower preferred values, this should be understood to specifically disclose all ranges formed by any pairing of any range upper limit or preferred value with any range lower limit or preferred value, regardless of whether the range is disclosed individually. For example, when the range "1 to 5" is disclosed, the described range should be interpreted to include ranges such as "1 to 4", "1 to 3", "1 to 2", "1 to 2 and 4 to 5", "1 to 3 and 5", etc. When a numerical range is described herein, unless otherwise specified, the range is intended to include its end values and all integers and fractions within the range.

[0034] In these embodiments, unless otherwise specified, the parts and percentages are by mass. "Parts by mass" refers to the basic measurement unit representing the mass ratio relationship of multiple components. 1 part can represent any unit mass, such as 1 g or 3.527 g, etc. If we say that the mass part of component A is a parts and the mass part of component B is b parts, it means the mass ratio of component A to component B is a:b. Or, it means the mass of component A is aK and the mass of component B is bK (K is any number representing a multiple factor). It should not be misunderstood that, different from the number of mass parts, the sum of the mass parts of all components is not limited to 100 parts. "And / or" is used to indicate that one or both of the described situations may occur. For example, A and / or B includes (A and B) and (A or B).

[0035] To better understand the above technical solutions, the exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more clear and thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0036] The first aspect of the present application mentions a molybdenum alloy, comprising:

[0037] A base phase, which occupies 96% to 98% of the mass of the molybdenum alloy. The base phase is an alloy composed of Mo, Ta, and W elements. In the molybdenum alloy, the content of Ta is 0.1% to 0.8% of the mass of the molybdenum alloy, and the content of W is 0.1% to 0.8% of the mass of the molybdenum alloy. The balance of the molybdenum alloy is molybdenum;

[0038] A rare earth phase, which is distributed in the base phase. The rare earth phase is Ce element. Among them, the content of Ce is 1% to 3% of the mass of the molybdenum alloy.

[0039] In the present technical solution, a molybdenum alloy is proposed, including a basic phase and a rare earth phase, wherein the basic phase is an alloy composed of Mo, Ta and W elements, and the rare earth phase is Ce element. In the molybdenum alloy, the addition of raw material Ce includes but is not limited to solid, liquid and gaseous states, and is not limited to Ce element and / or Ce oxide.

[0040] It should be noted that in actual production applications, due to the soft texture of molybdenum, in order to improve the mechanical properties of the alloy such as hardness, plasticity or strength, second-phase metal particles are often doped into it to improve its mechanical properties. However, the creep strength of this molybdenum alloy, which is difficult to characterize at high temperatures, is lower than that of pure molybdenum. The beneficial effect of this solution is that a molybdenum alloy is obtained by sintering a mixed raw material containing Mo, Ta, W and Ce. It has strong hardness and good creep resistance, and can be used in various fields such as aerospace, biomedicine, mechanical electronics, automotive industry and daily life.

[0041] In this technical solution, the molybdenum alloy prepared using the aforementioned ratio exhibits a lower creep rate than pure molybdenum, surpassing not only pure molybdenum but also ceramic oxide molybdenum alloys. Consequently, parts made from this alloy maintain dimensional stability even at high temperatures, demonstrating significant strength and performance advantages at high temperatures.

[0042] In this technical solution, the molybdenum alloy also includes impurities, which are distributed in the basic phase. There are multiple impurities, and the total mass of the multiple impurities does not exceed 0.5% of the mass of the molybdenum alloy. The content of each impurity does not exceed 0.05% of the mass of the basic phase.

[0043] It should be noted that, in the production and preparation process of molybdenum alloy, inevitable impurities will be contained, wherein the impurities can be a variety of elements, and this application does not limit the existence form of the above elements.

[0044] In this technical solution, four representative feasible embodiments and two comparative examples are selected and listed as follows:

[0045]

[0046] Example 1

[0047] Molybdenum accounts for 97% of the mass of the molybdenum alloy, the content of Ta is 0.4% of the mass of the molybdenum alloy, the content of W is 0.3% of the mass of the molybdenum alloy, and the content of Ce is 2% of the mass of the molybdenum alloy.

[0048] Exemplary, reference Figure 2 , Figure 2Taking the molybdenum alloy produced by the mixing ratio of Example 1 as the raw material, hot-rolled materials are prepared. By controlling the test conditions within a controllable temperature range of 1600 °C and a creep stress of 1 kgf / mm, the obtained creep curve has the time on the abscissa and the offset of the hot-rolled molybdenum alloy on the ordinate. This curve characterizes the change in the offset of the hot-rolled material under the above conditions as time increases.

[0049] It should be noted that the time shown in the above figure is 30 h. The offset of the hot-rolled material provided in the example changes within 30 h, but no fracture occurs. The above hot-rolled material just shows slight cracks at 200 h.

[0050] Example 2

[0051] Molybdenum accounts for 97% of the mass of the molybdenum alloy, the content of Ta is 0.2% of the mass of the molybdenum alloy, the content of W is 0.4% of the mass of the molybdenum alloy, and the content of Ce is 2% of the mass of the molybdenum alloy.

[0052] Exemplarily, referring to Figure 3 , Figure 3 Taking the molybdenum alloy produced by the mixing ratio of Example 2 as the raw material, hot-rolled materials are prepared. By controlling the test conditions within a controllable temperature range of 1600 °C and a creep stress of 1 kgf / mm, the obtained creep curve has the time on the abscissa and the offset of the hot-rolled molybdenum alloy on the ordinate. This curve characterizes the change in the offset of the hot-rolled material under the above conditions as time increases.

[0053] It should be noted that Figure 3 in the given creep curve, at 2 h, the offset is 0, which is due to the lack of data recording during the detection process. Comparing with other test results, it can be seen that there will be a slight offset at 2 h, but it is relatively small. Therefore Figure 3 the example results have reference value for observing the creep results.

[0054] Example 3

[0055] Molybdenum accounts for 96% of the mass of the molybdenum alloy, the content of Ta is 0.8% of the mass of the molybdenum alloy, the content of W is 0.1% of the mass of the molybdenum alloy, and the content of Ce is 3% of the mass of the molybdenum alloy.

[0056] Exemplarily, referring to Figure 4 , Figure 4 Taking the molybdenum alloy produced by the mixing ratio of Example 3 as the raw material, hot-rolled materials are prepared. By controlling the test conditions within a controllable temperature range of 1600 °C and a creep stress of 1 kgf / mm, the obtained creep curve has the time on the abscissa and the offset of the hot-rolled molybdenum alloy on the ordinate. This curve characterizes the change in the offset of the hot-rolled material under the above conditions as time increases.

[0057] Example 4

[0058] Molybdenum accounts for 99% of the mass of the molybdenum alloy, the content of Ta is 0.1% of the mass of the molybdenum alloy, the content of W is 0.8% of the mass of the molybdenum alloy, and the content of Ce is 1% of the mass of the molybdenum alloy.

[0059] Exemplarily, referring to Figure 5 , Figure 5 The molybdenum alloy produced in the mixing ratio shown as Example 4 is used as the raw material to prepare a hot-rolled material. The test conditions are controlled. Under the condition that the temperature is within the controllable range of 1600 °C and the creep stress is 1 kgf / mm, the obtained creep curve has the abscissa as time and the ordinate as the offset of the hot-rolled material of the molybdenum alloy. This curve characterizes the change in the offset of the hot-rolled material under the above conditions with the increase of time.

[0060] Comparative Example 1

[0061] Molybdenum accounts for 99% of the mass of the molybdenum alloy, the content of Ta is 0% of the mass of the molybdenum alloy, the content of W is 0% of the mass of the molybdenum alloy, and the content of Ce is 1% of the mass of the molybdenum alloy.

[0062] Exemplarily, referring to Figure 6 , Figure 6 The molybdenum alloy produced in the mixing ratio shown as Comparative Example 1 is used as the raw material to prepare a hot-rolled material. The test conditions are controlled. Under the condition that the temperature is within the controllable range of 1600 °C and the creep stress is 1 kgf / mm, the obtained creep curve has the abscissa as time and the ordinate as the offset of the hot-rolled material of the molybdenum alloy. This curve characterizes the change in the offset of the hot-rolled material under the above conditions with the increase of time.

[0063] Comparative Example 2

[0064] Molybdenum accounts for 99% of the mass of the molybdenum alloy, the content of Ta is 0% of the mass of the molybdenum alloy, the content of W is 1% of the mass of the molybdenum alloy, and the content of Ce is 0%.

[0065] Exemplarily, referring to Figure 7 , Figure 7 The molybdenum alloy produced in the mixing ratio shown as Comparative Example 2 is used as the raw material to prepare a hot-rolled material. The test conditions are controlled. Under the condition that the temperature is within the controllable range of 1600 °C and the creep stress is 1 kgf / mm, the obtained creep curve has the abscissa as time and the ordinate as the offset of the hot-rolled material of the molybdenum alloy. This curve characterizes the change in the offset of the hot-rolled material under the above conditions with the increase of time.

[0066] It should be noted that by controlling the test conditions and conducting mechanical property tests on the above molybdenum alloy, the principle lies in that the grain length of the above molybdenum alloy is affected. For the doped molybdenum alloy, by doping other phases such as Ta, W, and Ce, the recrystallization temperature and grain structure change of the molybdenum alloy are altered.

[0067] It should be noted that by comparing Figure 2 and Figure 6 , that is, the creep curves of Example 1 and Comparative Example 1, it can be seen that without doping the Ta and W phases, the offset is characterized as about 5 mm after 30 h. After doping with a certain proportion of Ta and W phases, the offset is characterized as 1.2 mm after 30 h, indicating that Example 1 after doping has excellent creep resistance strength.

[0068] It should be noted that by comparing Figure 2 and Figure 7 , that is, the creep curves of Example 1 and Comparative Example 2, it can be seen that without doping the Ce phase, the offset is characterized as about 4.5 mm after 30 h. After doping with a certain proportion of Ta and W phases, the offset is characterized as 1.2 mm after 30 h, indicating that Example 1 after doping has excellent creep resistance strength.

[0069] Has excellent creep resistance strength.

[0070] In this technical solution, a more preferred ratio is: the base phase accounts for 97% - 98% of the mass of the molybdenum alloy. The base phase is an alloy composed of Mo, Ta, and W elements. In the alloy, the content of Ta is 0.1% - 0.5% of the mass of the molybdenum alloy, the content of W is 0.2% - 0.4% of the mass of the molybdenum alloy, and the balance of the molybdenum alloy is molybdenum; the rare earth phase is Ce element, and among them, the content of Ce is 0.1% - 0.5% of the mass of the molybdenum alloy.

[0071] It should be noted that by comparing Figure 2 and Figure 4 , that is, the creep curves of Example 1 and Example 3, it can be seen that the offset of Example 1 is characterized as 1.2 mm after 30 h, and the offset of Example 3 is characterized as 1.5 mm after 30 h, indicating that doping with a Ta content of 0.4% of the mass of the molybdenum alloy, a W content of 0.3% of the mass of the molybdenum alloy, and a Ce content of 2% of the mass of the molybdenum alloy is a relatively optimal implementation scheme.

[0072] The second aspect of this application mentions a preparation method of a molybdenum alloy. Referring to Figure 1 , the above method includes:

[0073] Step S1: Mix molybdenum powder, tantalum powder, tungsten powder and cerium dioxide powder evenly, and press the mixed composite molybdenum powder to obtain a pressed blank.

[0074] Weigh the metal components and rare earth components in each base phase of the molybdenum alloy according to the required mass. Exemplarily, before weighing the raw materials, the oxide scale on the metal surface can be removed, which can reduce the content of impurities in the subsequent alloying process. Put molybdenum powder, tantalum powder, tungsten powder and cerium dioxide powder into a grinding jar and grind them to obtain a mixture. Press the mixed powder, control the pressure to be 500 MPa to 900 MPa, compact it, and maintain the pressure unchanged. Control the pressing time to be 15 to 30 minutes to obtain a compacted pressed blank.

[0075] Exemplarily, before weighing, the large pieces of materials or coarse particles can be refined by mechanical crushing.

[0076] Step S2: Sinter the pressed blank, control the sintering temperature to be 1500 - 1800 degrees Celsius, and control the sintering time to be 7 - 8 hours to obtain a molybdenum alloy.

[0077] Put the pressed blank after pressing into a sintering device for sintering. Control the uniform heating rate to continue heating until the temperature reaches 1400 - 1600 °C, and maintain the temperature for 2 - 3 hours to obtain a molybdenum alloy.

[0078] In this technical solution, step S1 includes: Step S11: Grind molybdenum powder, tantalum powder, tungsten powder and cerium dioxide powder for 6 - 18 hours, then add a liquid solvent and continue grinding for 8 - 12 hours. Place the mixture in a vacuum drying oven and dry it at 80 °C to obtain a dry mixture.

[0079] Exemplarily, molybdenum powder, tantalum powder, tungsten powder and cerium dioxide powder can be ground by ball milling. After grinding for 6 - 18 hours, add a liquid solvent and continue grinding for 8 - 12 hours, and then dry the obtained product to obtain a dry mixture.

[0080] Exemplarily, the dry mixture obtained after the above steps can be further ball milled dry for 10 - 12 hours.

[0081] Exemplarily, the above liquid solvent can include but is not limited to bicarbonates, sulfates, etc. Adding a liquid solvent to the powder of the above components and continuing to grind can increase the mixing uniformity between the components.

[0082] In this technical solution, step S1 further includes: Step S12: Perform a reduction reaction on the dry mixture with a reducing gas.

[0083] Exemplarily, during the above-mentioned pretreatment operation, oxidation reactions of metals may occur to the above-mentioned molybdenum powder, tantalum powder, tungsten powder, and cerium dioxide powder. Reducing the dried mixture after grinding can eliminate impurities and improve the purity of the molybdenum alloy.

[0084] Preferably, the reducing gas is hydrogen or carbon monoxide.

[0085] Exemplarily, the obtained dried mixture can be reduced with hydrogen at 500°C to 800°C for 6h to 8h, and heated for 5h for hydrogen reduction.

[0086] Exemplarily, the obtained dried mixture can be reduced with hydrogen at 550°C for 6h, and heated for 5h for carbon monoxide reduction.

[0087] In the technical solution of the present invention, the sintering environment can be controlled to be a reducing atmosphere, an inert atmosphere, or a vacuum environment during the sintering process. It should be noted that during the sintering process, accompanied by high temperatures, the product is easily oxidized by oxygen in the air. Therefore, controlling the stability of the sintering environment can reduce the content of impurities, thereby improving the mechanical properties of the alloy.

[0088] In the technical solution of the present invention, the above-mentioned sintering method is microwave sintering.

[0089] It can be understood that microwave sintering can utilize the absorption of microwave energy by the material to be converted into the kinetic energy and thermal energy of internal molecules, so that the material is uniformly heated to a certain temperature as a whole to achieve the purpose of densification sintering.

[0090] In the technical solution of the present invention, using the microwave sintering method can save energy consumption during the preparation process while increasing production efficiency, making the molybdenum alloy heated evenly, and reducing defects such as large deformation and sintering cracks that may occur during the sintering process of the molybdenum alloy.

[0091] In the technical solution of the present invention, the particle sizes of the molybdenum powder, tantalum powder, tungsten powder, and cerium dioxide powder are controlled to be less than 300 mesh, and the more preferred particle size is less than 240 mesh. Controlling the particle size of the powder can enable full fusion between multiple phases, inhibit the crystal expansion of molybdenum at high temperatures, and improve its strength and creep resistance at high temperatures.

[0092] Exemplarily, hot-rolled materials can be obtained by hot-rolling the above-mentioned molybdenum alloy;

[0093] Exemplarily, the thickness of the above-mentioned hot-rolled material can be 2 to 4 mm. Conducting a mechanical property analysis on the above-mentioned hot-rolled material can obtain corresponding mechanical indexes.

[0094] In the description of the present invention, each embodiment focuses on the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple. For the relevant parts, reference can be made to the description of the method part.

[0095] In the description of the present invention, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. In the description of the present invention, the meaning of "a plurality of" is two or more, unless otherwise specifically defined. Moreover, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0096] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

[0097] In the description of this specification, the descriptions of terms such as "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0098] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for preparing a molybdenum alloy, characterized in that, The molybdenum alloy includes: A base phase, which occupies 96% - 98% of the mass of the molybdenum alloy. The base phase is an alloy composed of Mo, Ta, and W elements. In the molybdenum alloy, the content of Ta is 0.1% - 0.8% of the mass of the molybdenum alloy, the content of W is 0.1% - 0.8% of the mass of the molybdenum alloy, and the balance of the molybdenum alloy is molybdenum; A rare earth phase, which is distributed in the base phase. The rare earth phase is Ce element, and the content of Ce is 1% - 3% of the mass of the molybdenum alloy; The preparation method includes: before weighing the raw materials, removing the oxide scale on the metal surface. After grinding molybdenum powder, tantalum powder, tungsten powder, and cerium dioxide powder for 6 - 18 h, adding a liquid solvent and continuing to grind for 8 - 12 h. Placing the mixture in a vacuum drying oven and drying at 80 °C to obtain a dried mixture, and pressing the mixed composite molybdenum powder to obtain a pressed blank; Controlling the pressure to be 500 MPa - 900 MPa, pressing it tightly, and maintaining the pressure unchanged, and controlling the pressing time to be 15 - 30 min; Sintering the pressed blank, controlling the sintering temperature to be 1500 - 1800 degrees Celsius, and controlling the sintering time to be 7 - 8 h to obtain the molybdenum alloy; The liquid solvent includes: bicarbonate, sulfate.

2. The preparation method of a molybdenum alloy according to claim 1, characterized in that The molybdenum alloy further includes: Impurities, which are distributed in the base phase. There are multiple impurities, and the total mass of the multiple impurities does not exceed 0.5% of the mass of the base phase, and the content of each impurity does not exceed 0.05% of the mass of the base phase.

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