A molybdenum-rhenium-ruthenium alloy and its preparation method

Abstract

The invention discloses a molybdenum-rhenium-ruthenium alloy, which is composed of the following components in percentage by mass: 12% to 15% Re, 0.3% to 0.6% Ru, and the remainder being Mo and other impurity elements. The molybdenum-rhenium-ruthenium alloy is prepared by the following method: first, dissolving hydrated ruthenium trichloride in anhydrous ethanol, mixing the dissolved ruthenium trichloride with molybdenum powder, performing hydrogen reduction, and then adding an aqueous solution of ammonium perrhenate and mixing uniformly; second, performing two-stage calcination and reduction to obtain molybdenum-rhenium-ruthenium alloy powder; third, performing cold isostatic pressing and vacuum sintering to obtain a molybdenum-rhenium-ruthenium alloy sintered blank; and fourth, performing two vacuum electron beam melting processes and one vacuum consumable electrode arc melting process to obtain the molybdenum-rhenium-ruthenium alloy. The present invention adds ruthenium elements to the molybdenum-rhenium alloy to improve the high-temperature corrosion resistance, strength, and plasticity of the molybdenum-rhenium alloy, and inhibits grain growth during the smelting process; the smelting method of the present invention obtains a molybdenum-rhenium-ruthenium alloy with a finer grain structure, more uniform composition, and lower impurity content, thereby avoiding defects and cracks in subsequent processing.

Description

Technical Field

[0001] The present invention belongs to the technical field of metal material processing, and in particular relates to a molybdenum-rhenium-ruthenium alloy and a preparation method thereof. Background Art

[0002] Molybdenum-rhenium alloys, due to the "rhenium effect," significantly improve the intrinsic brittleness and radiation brittleness of molybdenum, enhancing the alloy's processing and welding properties, making them very promising candidate materials for advanced reactor cladding, heat pipes, and structures. Due to their high melting point, powder metallurgy is commonly used to prepare billets. However, these billets typically have high oxygen contents. Electron beam melting, on the other hand, can significantly remove impurities and achieve excellent purification results. However, electron beam melted molybdenum-rhenium alloys, especially those with a rhenium content of approximately 12% to 15%, are prone to defects during hot press processing due to their coarse grains and fragile grain boundaries. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to address the deficiencies of the above-mentioned prior art and provide a molybdenum-rhenium-ruthenium alloy. The molybdenum-rhenium-ruthenium alloy of the present invention improves the high-temperature corrosion resistance, strength, and plasticity of the molybdenum-rhenium alloy by adding ruthenium to the alloy, strengthens the grain boundaries, and effectively inhibits grain growth during the smelting process of preparing the molybdenum-rhenium-ruthenium alloy, thereby achieving superior performance compared to conventional molybdenum-rhenium alloys.

[0004] To solve the above technical problems, the technical solution adopted by the present invention is: a molybdenum-rhenium-ruthenium alloy, characterized in that it is composed of the following components in percentage by mass: Re 12% to 15%, Ru 0.3% to 0.6%, and the balance is Mo and other impurity elements, and the total amount of other impurity elements does not exceed 0.1%.

[0005] The molybdenum-rhenium-ruthenium alloy of the present invention adds ruthenium elements to the molybdenum-rhenium alloy. Since metallic ruthenium is a noble metal element belonging to Group VIII B, it has an electronic layer structure similar to that of Pt and is very stable in chemical properties. When molybdenum is alloyed with Group VIII B elements, the directionality of electronic bonds is reduced, interatomic stress is reduced, and the low-temperature brittleness of metallic molybdenum is reduced. Therefore, the present invention improves the high-temperature corrosion resistance, strength, and plasticity of the molybdenum-rhenium alloy by adding ruthenium elements to the molybdenum-rhenium alloy, strengthens the grain boundaries, and effectively suppresses grain growth during the smelting process for preparing the molybdenum-rhenium-ruthenium alloy, thereby obtaining better performance than traditional molybdenum-rhenium alloys.

[0006] The above-mentioned molybdenum-rhenium-ruthenium alloy is characterized by being composed of the following components in percentage by mass: Re 14%, Ru 0.6%, and the balance being Mo and other impurity elements, and the total amount of other impurity elements does not exceed 0.1%.

[0007] In addition, the present invention also discloses a method for preparing the molybdenum-rhenium-ruthenium alloy as described above, characterized in that the method comprises the following steps:

[0008] Step 1: Dissolve hydrated ruthenium trichloride in anhydrous ethanol and mix with molybdenum powder to obtain molybdenum-ruthenium alloy powder, then add an aqueous solution of ammonium perrhenate and mix well to obtain a mixed powder;

[0009] Step 2: placing the mixed powder obtained in step 2 into a high-temperature alloy boat, and then performing two-stage calcination reduction under a hydrogen atmosphere to obtain a molybdenum-rhenium-ruthenium alloy powder;

[0010] Step 3: cold isostatic pressing and vacuum sintering are performed on the molybdenum-rhenium-ruthenium alloy powder obtained in step 2 to obtain a molybdenum-rhenium-ruthenium alloy sintered blank;

[0011] Step 4: The molybdenum-rhenium-ruthenium alloy sintered blank obtained in step 3 is subjected to two vacuum electron beam meltings and one vacuum consumable electrode arc melting in sequence to obtain a molybdenum-rhenium-ruthenium alloy.

[0012] The process of preparing molybdenum-ruthenium alloy powder by dissolving hydrated ruthenium trichloride in anhydrous ethanol and then mixing it with molybdenum powder for hydrogen reduction in step 1 of the present invention can be found in the invention patent application number 202110233893.4 "A method for preparing a micro-alloyed molybdenum-ruthenium alloy"

[0013] The present invention first mixes molybdenum-ruthenium alloy powder with uniform ruthenium element distribution with an aqueous solution of ammonium perrhenate, and then performs two-stage calcination reduction. During the process, the ammonium perrhenate is successively decomposed and reduced to convert into elemental rhenium powder with finer particle size, which is uniformly attached to the molybdenum powder. The powder is then isostatically pressed and sintered to obtain a molybdenum-rhenium-ruthenium alloy billet with uniform composition. The molybdenum-rhenium-ruthenium alloy sintered billet is subjected to two vacuum electron beam melting processes for deep purification and impurity removal, followed by one vacuum consumable electrode arc melting process and rapid cooling to obtain a molybdenum-rhenium-ruthenium alloy with finer grains and more uniform composition than that obtained after conventional electron beam melting. At the same time, the molybdenum-rhenium-ruthenium alloy has a finer grain structure and more uniform composition than a molybdenum-rhenium alloy without ruthenium addition, and has a lower impurity content than a molybdenum-rhenium alloy produced by powder metallurgy. Therefore, defects and cracks are less likely to occur under hot pressure processing, which is conducive to the smooth forming of molybdenum-rhenium-ruthenium alloy workpieces.

[0014] The above preparation method is characterized in that the mass content of rhenium in the ammonium perrhenate in step 1 is 69.4%. The present invention accurately guarantees the amount of ruthenium added through this limitation.

[0015] The above-mentioned preparation method is characterized in that the homogenous mixing process in step 1 comprises: stirring the molybdenum-ruthenium alloy powder and the aqueous solution of ammonium perrhenate, drying the mixture, and then transferring the mixture to a three-dimensional mixer for mixing for 4 hours. By employing this homogenous mixing process, the present invention ensures that the ammonium perrhenate solution evaporates and precipitates, uniformly coating the surface of the molybdenum-ruthenium alloy powder, thereby improving the compositional uniformity of the molybdenum-rhenium-ruthenium alloy.

[0016] The above-mentioned preparation method is characterized in that the high-temperature alloy boat in step 2 is a molybdenum boat.

[0017] The above-mentioned preparation method is characterized by the two-stage calcination-reduction system in step 2: the first stage is at a temperature of 300°C to 350°C for 1.5 hours to 2 hours; the second stage is at a temperature of 800°C to 950°C for 2 hours to 4 hours. By limiting the two-stage calcination-reduction system, the present invention facilitates enhanced rhenium reduction and prevents agglomeration of the prepared molybdenum-rhenium-ruthenium alloy powder.

[0018] The above-mentioned preparation method is characterized in that the molybdenum-rhenium-ruthenium alloy described in step 4 is subjected to high-temperature extrusion to form a blank, followed by forging or rolling to obtain a rod or plate. The present invention adopts the method of extrusion followed by forging or rolling, which increases the deformation and improves the mechanical properties of the rod or plate product.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1. The molybdenum-rhenium-ruthenium alloy of the present invention improves the high-temperature corrosion resistance, strength, and plasticity of the molybdenum-rhenium alloy by adding ruthenium elements to the molybdenum-rhenium alloy, strengthens the grain boundaries, and effectively inhibits the growth of grains during the smelting process of preparing the molybdenum-rhenium-ruthenium alloy, thereby obtaining better performance than traditional molybdenum-rhenium alloys.

[0021] 2. Compared with directly adding rhenium powder, the present invention mixes the molybdenum-ruthenium alloy powder with an aqueous solution of ammonium perrhenate and then performs two-stage calcination reduction, thereby improving the distribution uniformity of the rhenium element in the molybdenum-rhenium-ruthenium alloy billet.

[0022] 3. The present invention adopts a method of two vacuum electron beam meltings followed by one vacuum consumable electrode arc melting to obtain a molybdenum-rhenium-ruthenium alloy with a finer grain structure, more uniform composition, and lower impurity content, thereby avoiding defects and cracks in subsequent processing.

[0023] 4. The ruthenium element is evenly distributed in the molybdenum-rhenium-ruthenium alloy prepared by the present invention, which reduces the amount of precious metal ruthenium used. On the premise of obtaining a molybdenum-rhenium-ruthenium alloy with better performance, the raw material cost of the molybdenum-rhenium-ruthenium alloy is reduced.

[0024] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is the macroscopic metallographic structure diagram of the molybdenum-rhenium-ruthenium alloy ingot prepared in Example 1 of the present invention.

[0026] Figure 2a This is the longitudinal metallographic structure diagram (200×) of the molybdenum-rhenium-ruthenium alloy forging rod prepared in Example 1 of the present invention.

[0027] Figure 2b This is the transverse metallographic structure diagram (200×) of the molybdenum-rhenium-ruthenium alloy forging bar prepared in Example 1 of the present invention.

[0028] Figure 3a This is a longitudinal metallographic structure diagram (200×) of the molybdenum-rhenium-ruthenium alloy forging rod prepared in Example 1 of the present invention after recrystallization annealing.

[0029] Figure 3b This is a transverse metallographic structure diagram (200×) of the molybdenum-rhenium-ruthenium alloy forging bar prepared in Example 1 of the present invention after recrystallization annealing.

[0030] Figure 4 This is the macroscopic metallographic structure diagram of the molybdenum-rhenium alloy ingot prepared in Comparative Example 1 of the present invention. DETAILED DESCRIPTION

[0031] Example 1

[0032] The molybdenum-rhenium-ruthenium alloy of this embodiment is composed of the following components in percentage by mass: Re 14%, Ru 0.6%, and the remainder being Mo and other impurity elements, and the total amount of other impurity elements does not exceed 0.1%.

[0033] The method for preparing the molybdenum-rhenium-ruthenium alloy of this embodiment comprises the following steps:

[0034] Step 1: Dissolve hydrated ruthenium trichloride in anhydrous ethanol and mix it with molybdenum powder for hydrogen reduction to obtain a molybdenum-ruthenium alloy powder with a ruthenium element content of 0.7% by mass. Dissolve 1.8 kg of ammonium perrhenate with a rhenium element content of 69.4% by mass in water, then add 8.75 kg of the molybdenum-ruthenium alloy powder, stir and dry, and then transfer to a 20 L polytetrafluoroethylene mixing barrel and install it in a three-dimensional mixer for mixing for 4 hours to obtain a mixed powder.

[0035] Step 2: Place the mixed powder obtained in step 2 into a molybdenum material boat, and then perform two-stage calcination reduction under a hydrogen atmosphere, wherein the first stage is at a temperature of 300°C for 2 hours and the second stage is at a temperature of 800°C for 4 hours to obtain a molybdenum-rhenium-ruthenium alloy powder;

[0036] Step 3: The molybdenum-rhenium-ruthenium alloy powder obtained in step 2 is placed in a rubber sleeve with a diameter of 110 mm and cold isostatically pressed at a pressing pressure of 190 MPa and a holding pressure of 60 seconds, and then vacuum sintered at a sintering temperature of 2200° C. and a holding time of 8 hours to obtain a molybdenum-rhenium-ruthenium alloy sintered blank with a diameter of 90 mm;

[0037] Step 4: The molybdenum-rhenium-ruthenium alloy sintered billet obtained in step 3 is subjected to two vacuum electron beam melting processes and one vacuum consumable electrode arc melting process in sequence to obtain a molybdenum-rhenium-ruthenium alloy ingot with a diameter of 90 mm. After high-temperature extrusion and billet opening, high-temperature forging is performed to obtain a molybdenum-rhenium-ruthenium alloy forging rod with a diameter of 30 mm.

[0038] According to the test, the mass content of Re in the molybdenum-rhenium-ruthenium alloy ingot prepared in this embodiment is 14.4%, and the mass content of Ru is 0.61%.

[0039] Figure 2a This is the longitudinal metallographic structure diagram (200×) of the molybdenum-rhenium-ruthenium alloy forging bar prepared in this embodiment. Figure 2b This is the transverse metallographic structure diagram (200×) of the molybdenum-rhenium-ruthenium alloy forging bar prepared in this embodiment, combined with Figure 2a and Figure 2b It can be seen that the grains in the molybdenum-rhenium-ruthenium alloy forging rod are elongated due to deformation, forming a fibrous structure, and the grains are uniform without defects and cracks.

[0040] Figure 3a This is a longitudinal microstructure diagram (200×) of the molybdenum-rhenium-ruthenium alloy forging bar prepared in this embodiment after recrystallization annealing (1600°C / 2h). Figure 3b This is the transverse metallographic structure diagram (200×) of the molybdenum-rhenium-ruthenium alloy forging rod prepared in this embodiment after recrystallization annealing. Figure 3a and Figure 3b It can be seen that the grains of the molybdenum-rhenium-ruthenium alloy forging rod after recrystallization annealing are uniform, without abnormal growth, and the grain boundaries are curved, without forming the straight grain boundaries of ordinary molybdenum alloys, so the molybdenum-rhenium alloy forging rod has good elongation.

[0041] Comparative Example 1

[0042] The difference between this comparative example and Example 1 is that the alloy does not contain ruthenium element and is a Mo14Re alloy.

[0043] Figure 1 This is the macroscopic metallographic structure diagram of the molybdenum-rhenium-ruthenium alloy ingot prepared in Example 1 of the present invention. Figure 4 This is the macroscopic metallographic structure diagram of the molybdenum-rhenium alloy ingot prepared in Comparative Example 1 of the present invention. Figure 1 and Figure 4By comparison, it can be seen that the grains in the molybdenum-rhenium-ruthenium alloy ingot are smaller, indicating that the present invention effectively suppresses grain growth during the electron beam melting process by adding ruthenium elements to the molybdenum-rhenium alloy, and significantly reduces columnar crystals, thereby refining the structure.

[0044] Example 2

[0045] The molybdenum-rhenium-ruthenium alloy of this embodiment is composed of the following components in percentage by mass: Re 12%, Ru 0.3%, and the balance being Mo and other impurity elements, and the total amount of other impurity elements does not exceed 0.1%.

[0046] The method for preparing the molybdenum-rhenium-ruthenium alloy of this embodiment comprises the following steps:

[0047] Step 1: Dissolve hydrated ruthenium trichloride in anhydrous ethanol and mix it with molybdenum powder for hydrogen reduction to obtain a molybdenum-ruthenium alloy powder with a ruthenium element content of 0.4% by mass. Dissolve 1.5 kg of ammonium perrhenate with a rhenium element content of 69.4% by mass in water, then add 8.75 kg of the molybdenum-ruthenium alloy powder, stir and dry, and then transfer to a 20 L polytetrafluoroethylene mixing barrel and install it in a three-dimensional mixer for mixing for 4 hours to obtain a mixed powder.

[0048] Step 2: Place the mixed powder obtained in step 2 into a molybdenum material boat, and then perform two-stage calcination reduction under a hydrogen atmosphere, wherein the first stage is at a temperature of 350°C for 1.5 hours and the second stage is at a temperature of 950°C for 2 hours to obtain a molybdenum-rhenium-ruthenium alloy powder;

[0049] Step 3: The molybdenum-rhenium-ruthenium alloy powder obtained in step 2 is placed in a rubber sleeve with a diameter of 110 mm and cold isostatically pressed at a pressing pressure of 190 MPa and a holding pressure of 60 seconds, and then vacuum sintered at a sintering temperature of 2200° C. and a holding time of 8 hours to obtain a molybdenum-rhenium-ruthenium alloy sintered blank with a diameter of 90 mm;

[0050] Step 4: The molybdenum-rhenium-ruthenium alloy sintered billet obtained in step 3 is subjected to two vacuum electron beam melting processes and one vacuum consumable electrode arc melting process in sequence to obtain a molybdenum-rhenium-ruthenium alloy ingot with a diameter of 90 mm. After high-temperature extrusion and billet opening, high-temperature rolling is performed to obtain a molybdenum-rhenium-ruthenium alloy rolled plate with a thickness of 10 mm.

[0051] After testing, the mass content of Re in the molybdenum-rhenium-ruthenium alloy ingot prepared in this embodiment was 12.1%, and the mass content of Ru was 0.28%.

[0052] Example 3

[0053] The molybdenum-rhenium-ruthenium alloy of this embodiment is composed of the following components in percentage by mass: Re 14%, Ru 0.3%, and the balance being Mo and other impurity elements, and the total amount of other impurity elements does not exceed 0.1%.

[0054] The method for preparing the molybdenum-rhenium-ruthenium alloy of this embodiment comprises the following steps:

[0055] Step 1: Dissolve hydrated ruthenium trichloride in anhydrous ethanol and mix it with molybdenum powder for hydrogen reduction to obtain a molybdenum-ruthenium alloy powder with a ruthenium element content of 0.4% by mass. Dissolve 1.8 kg of ammonium perrhenate with a rhenium element content of 69.4% by mass in water, then add 8.75 kg of the molybdenum-ruthenium alloy powder, stir and dry, and then transfer to a 20 L polytetrafluoroethylene mixing barrel and install it in a three-dimensional mixer for mixing for 4 hours to obtain a mixed powder.

[0056] Step 2: Place the mixed powder obtained in step 2 into a molybdenum material boat, and then perform two-stage calcination reduction under a hydrogen atmosphere, wherein the first stage is at a temperature of 300°C for 2 hours and the second stage is at a temperature of 900°C for 2 hours to obtain a molybdenum-rhenium-ruthenium alloy powder;

[0057] Step 3: The molybdenum-rhenium-ruthenium alloy powder obtained in step 2 is placed in a rubber sleeve with a diameter of 110 mm and cold isostatically pressed at a pressing pressure of 190 MPa and a holding pressure of 60 seconds, and then vacuum sintered at a sintering temperature of 2200° C. and a holding time of 8 hours to obtain a molybdenum-rhenium-ruthenium alloy sintered blank with a diameter of 90 mm;

[0058] Step 4: The molybdenum-rhenium-ruthenium alloy sintered billet obtained in step 3 is subjected to two vacuum electron beam melting processes and one vacuum consumable electrode arc melting process in sequence to obtain a molybdenum-rhenium-ruthenium alloy ingot with a diameter of 90 mm. After high-temperature extrusion and billet opening, high-temperature rolling is performed to obtain a molybdenum-rhenium-ruthenium alloy rolled plate with a thickness of 10 mm.

[0059] After testing, the mass content of Re in the molybdenum-rhenium-ruthenium alloy ingot prepared in this embodiment was 14.1%, and the mass content of Ru was 0.31%.

[0060] Example 4

[0061] The molybdenum-rhenium-ruthenium alloy of this embodiment is composed of the following components in percentage by mass: Re 13%, Ru 0.5%, and the balance being Mo and other impurity elements, and the total amount of other impurity elements does not exceed 0.1%.

[0062] The method for preparing the molybdenum-rhenium-ruthenium alloy of this embodiment comprises the following steps:

[0063] Step 1: Dissolve hydrated ruthenium trichloride in anhydrous ethanol and mix it with molybdenum powder for hydrogen reduction to obtain a molybdenum-ruthenium alloy powder with a ruthenium element content of 0.5% by mass. Dissolve 1.7 kg of ammonium perrhenate with a rhenium element content of 69.4% by mass in water, then add 8.75 kg of the molybdenum-ruthenium alloy powder, stir and dry, and then transfer to a 20 L polytetrafluoroethylene mixing barrel and install it in a three-dimensional mixer for mixing for 4 hours to obtain a mixed powder.

[0064] Step 2: Place the mixed powder obtained in step 2 into a molybdenum material boat, and then perform two-stage calcination reduction under a hydrogen atmosphere, wherein the first stage is at a temperature of 300°C for 2 hours and the second stage is at a temperature of 900°C for 2 hours to obtain a molybdenum-rhenium-ruthenium alloy powder;

[0065] Step 3: The molybdenum-rhenium-ruthenium alloy powder obtained in step 2 is placed in a rubber sleeve with a diameter of 110 mm and cold isostatically pressed at a pressing pressure of 190 MPa and a holding pressure of 60 seconds, and then vacuum sintered at a sintering temperature of 2200° C. and a holding time of 8 hours to obtain a molybdenum-rhenium-ruthenium alloy sintered blank with a diameter of 90 mm;

[0066] Step 4: The molybdenum-rhenium-ruthenium alloy sintered billet obtained in step 3 is subjected to two vacuum electron beam melting processes and one vacuum consumable electrode arc melting process in sequence to obtain a molybdenum-rhenium-ruthenium alloy ingot with a diameter of 90 mm. After high-temperature extrusion and billet opening, high-temperature forging is performed to obtain a molybdenum-rhenium-ruthenium alloy forging rod with a diameter of 30 mm.

[0067] According to the test, the mass content of Re in the molybdenum-rhenium-ruthenium alloy ingot prepared in this embodiment is 13.4%, and the mass content of Ru is 0.48%.

[0068] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent variation made to the above embodiment based on the essence of the invention technology shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A method for preparing a molybdenum-rhenium-ruthenium alloy, characterized in that: The molybdenum-ruthenium alloy is composed of the following components in percentage by mass: Re 12% to 15%, Ru 0.3% to 0.6%, and the balance being Mo and other impurity elements, with the total amount of other impurity elements not exceeding 0.1%; The preparation method of the molybdenum-rhenium-ruthenium alloy comprises the following steps: Step 1: Dissolve hydrated ruthenium trichloride in anhydrous ethanol and mix with molybdenum powder to obtain molybdenum-ruthenium alloy powder, then add an aqueous solution of ammonium perrhenate and mix well to obtain a mixed powder; Step 2: placing the mixed powder obtained in step 2 into a high-temperature alloy boat, and then performing two-stage calcination reduction under a hydrogen atmosphere to obtain a molybdenum-rhenium-ruthenium alloy powder; Step 3: cold isostatic pressing and vacuum sintering are performed on the molybdenum-rhenium-ruthenium alloy powder obtained in step 2 to obtain a molybdenum-rhenium-ruthenium alloy sintered blank; Step 4: The molybdenum-rhenium-ruthenium alloy sintered blank obtained in step 3 is subjected to two vacuum electron beam meltings and one vacuum consumable electrode arc melting in sequence to obtain a molybdenum-rhenium-ruthenium alloy.

2. The method for preparing a molybdenum-rhenium-ruthenium alloy according to claim 1, wherein: It is composed of the following components in percentage by mass: Re 14%, Ru 0.6%, and the balance being Mo and other impurity elements, and the total amount of other impurity elements does not exceed 0.1%.

3. The method for preparing a molybdenum-rhenium-ruthenium alloy according to claim 1, wherein: The mass content of rhenium element in the ammonium perrhenate described in step 1 is 69.4%.

4. The method for preparing a molybdenum-rhenium-ruthenium alloy according to claim 1, wherein: The uniform mixing process in step 1 is as follows: the molybdenum ruthenium alloy powder and the aqueous solution of ammonium perrhenate are stirred and dried, and then transferred to a three-dimensional mixer and mixed for 4 hours.

5. The method for preparing a molybdenum-rhenium-ruthenium alloy according to claim 1, wherein: The high-temperature alloy boat in step 2 is a molybdenum boat.

6. The method for preparing a molybdenum-rhenium-ruthenium alloy according to claim 1, wherein: The two-stage calcination reduction system in step 2 is: the temperature of the first stage is 300°C~350°C, and the time is 1.5h~2h; the temperature of the second stage is 800°C~950°C, and the time is 2h~4h.

7. The method for preparing a molybdenum-rhenium-ruthenium alloy according to claim 1, wherein: The molybdenum-rhenium-ruthenium alloy in step 4 is extruded at high temperature and then forged or rolled to obtain a rod or plate.

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