Method and device for preparing high-homogeneity molybdenum-rhenium alloy powder through gas phase co-reduction

Abstract

The invention discloses a device for preparing highly homogeneous molybdenum-rhenium alloy powder through gas phase co-reduction, the device comprises a ReO3 evaporation area A, a MoO3 evaporation area B, a mixed reduction area, a collection area and an exhaust pipe, the mixed reduction area is in a vertical pipe shape, the ReO3 evaporation area A and the MoO3 evaporation area B are communicated with the two sides of the top of the mixed reduction area, Ar input ends are arranged on the two opposite sides of the ReO3 evaporation area A and the MoO3 evaporation area B, and the collection area is communicated with the collection area. An H2 input end is further arranged at the top end of the mixed reduction area, the bottom of the mixed reduction area is communicated with the collecting area and an exhaust pipe, and the bottom of the exhaust pipe is introduced into a container filled with water and is immersed in the water; molybdenum trioxide and rhenium trioxide serve as raw materials and are heated to the melting point of the molybdenum trioxide and the melting point of the rhenium trioxide respectively, molybdenum trioxide gas and rhenium trioxide gas are obtained, then hydrogen is introduced, uniform distribution is rapidly and accurately achieved on the molecular level in a gas-gas mixing mode, and the mixing uniformity and fineness are greatly improved; and the nanoscale molybdenum-rhenium mixed powder with the uniform particle size can be obtained.

Description

Technical Field

[0001] The present invention belongs to the technical field of powder metallurgy, and particularly relates to a method and device for preparing highly homogeneous molybdenum-rhenium alloy powder by gas-phase co-reduction. Background Art

[0002] As a typical alloying strengthening material, molybdenum-rhenium alloy is mainly prepared by powder metallurgy process and melting method. Compared with the melting method, the powder metallurgy method for preparing molybdenum-rhenium alloy is to mix molybdenum powder and rhenium powder in a certain proportion, press them into shape, and then perform pre-sintering and high-temperature sintering to obtain a sintered blank. After that, a series of heat treatments or mechanical processing are carried out to improve its performance to obtain a molybdenum-rhenium alloy with excellent performance. In this process, the mixing uniformity of the powder is the core factor determining the success or failure of the alloy performance. If the mixing is uneven, it will directly lead to the non-uniformity of the internal structure and performance of the alloy, and in severe cases, it will cause the alloy components to fail under extreme conditions such as high temperature or high pressure. Therefore, ensuring the mixing uniformity of molybdenum powder and rhenium powder is crucial for improving the mechanical properties, high stability, and extending the service life of molybdenum-rhenium alloy.

[0003] The most common and simplest mixing method is to mechanically mix high-purity molybdenum powder and high-purity rhenium powder in a certain proportion under vacuum or inert gas protection in a V-type mixer or a conical mixer to obtain molybdenum-rhenium mixed powder. Although this method is simple to operate, it has strict requirements for raw materials. The purity of both molybdenum powder and rhenium powder needs to be above 99.95%, and the average particle size is below 5μm. It not only takes a long time but also inevitably has problems such as uneven mixing and impurity introduction. In order to improve this problem, some researchers combined mechanical mixing and hydrogen reduction. After mixing compounds containing molybdenum and rhenium elements through different mechanical mixing methods, hydrogen reduction is carried out to obtain molybdenum-rhenium mixed powder. According to different mixing methods of compounds, it is divided into three types: solid-solid, solid-liquid, and liquid-liquid mixing. Solid-solid mixing is to mix MoO 2 and ReO 2 and then reduce them in a hydrogen atmosphere to obtain molybdenum-rhenium powder. This method is the same as directly mixing molybdenum powder and rhenium powder. Although it reduces the raw material cost and the process is simple and fast, suitable for mass production, it is easy to cause uneven distribution of Re element, forming hard and brittle phases, which has an adverse effect on the alloy performance; solid-liquid mixing is to mix MoO 2 and NH 4 ReO 4 liquids, dry them, and then reduce them in a hydrogen atmosphere to obtain molybdenum-rhenium powder. This method can effectively improve the problem of Re element segregation, and the reduced Re powder can be evenly distributed around the Mo powder, but it is difficult to obtain nanoscale molybdenum-rhenium alloy powder; liquid-liquid mixing is to mix (NH 4 ) 2 MoO 4 and NH 4 ReO4 After being dissolved in water, liquid-liquid mixing and coprecipitation are carried out, and after drying, molybdenum-rhenium powder is obtained by reduction with hydrogen. This method is currently the best solution to solve the segregation of Re element and refine the particle size. However, NH 4 ReO 4 has too low solubility in deionized water, which limits the large-scale production of molybdenum-rhenium powder.

[0004] In summary, among the existing methods for preparing molybdenum-rhenium alloys, whether it is solid-solid mixing, solid-liquid mixing or liquid-liquid mixing powder metallurgy methods, there are problems such as long process time, poor uniformity, uneven powder particle size and high raw material cost, which are difficult to be popularized and used in industry. Summary of the Invention

[0005] The purpose of the present invention is to provide a method and device for gas-phase co-reduction to prepare highly homogeneous molybdenum-rhenium alloy powder, which can improve the mixing uniformity of molybdenum powder and rhenium powder and obtain nano-scale molybdenum-rhenium mixed powder with uniform particle size.

[0006] The present invention is realized through the following technical solutions:

[0007] A device for gas-phase co-reduction to prepare highly homogeneous molybdenum-rhenium alloy powder includes a ReO 3 evaporation zone A, a MoO 3 evaporation zone B, a mixing and reduction zone, a collection zone and an exhaust pipe. The mixing and reduction zone is vertically tubular. The ReO 3 evaporation zone A and the MoO 3 evaporation zone B are respectively arranged on both sides of the top of the mixing and reduction zone and communicated with it. And the ReO 3 evaporation zone A and the MoO 3 evaporation zone B are both provided with Ar input ends on opposite sides. And the top of the mixing and reduction zone is also provided with an H 2 input end. The output end at the bottom of the mixing and reduction zone is communicated with the collection zone. The exhaust pipe is arranged on both sides of the top of the collection zone and the collection zone is communicated with the exhaust pipe. The bottom of the exhaust pipe leads into a container filled with water and is immersed in the water.

[0008] Preferably, the evaporation zone A, the evaporation zone B, the mixing and reduction zone and the collection zone are all provided with heating furnaces.

[0009] Further, the collection zone includes an inner cavity and an outer cavity. The inner cavity is sleeved inside the outer cavity and has an open bottom. And the mixing and reduction zone is communicated with the inner cavity. The top of the inner cavity is communicated with the outer cavity. The top of the outer cavity is communicated with the exhaust pipe. And the heating furnace is uniformly arranged between the inner cavity and the outer cavity.

[0010] Further, a reflux channel enabling the gas to flow downward and upward alternately for multiple times is provided at the connection between the collection area and the mixing reduction area. The reflux channel is formed by the interlaced arrangement of the guide plates with a certain spacing opening downward at the bottom of the mixing reduction area and the top walls of the inner cavity and the outer cavity of the collection area, and the reflux channel is communicated with the exhaust pipe, and the exhaust pipe is located in the upper part of the collection area.

[0011] Further, the guide plates, the top walls of the inner cavity and the outer cavity of the collection area are all arc-shaped plates.

[0012] Preferably, the ReO 3 Evaporation zone A, MoO 3 Cut-off valves 1 and 2 for controlling the gas flow are respectively provided at the connections between evaporation zone B and the two sides of the top of the mixing reduction area.

[0013] Preferably, the ReO 3 Evaporation zone A, MoO 3 Pressure gauges are respectively provided inside evaporation zone B.

[0014] Preferably, cut-off valves a and b for controlling the gas flow are respectively provided at the Ar input end and the H 2 Input end.

[0015] A method for preparing high-homogeneity molybdenum-rhenium alloy powder by using the device according to any one of the above, comprising the following steps:

[0016] S1: Weigh the corresponding masses of ReO 3 And MoO 3 And place them into ReO 3 Evaporation zone A and MoO 3 Evaporation zone B respectively, and heat them to 800 °C in a heating furnace to generate ReO 3 Vapor and MoO 3 Vapor;

[0017] S2: Pump the mixing reduction area to a vacuum state, and preheat the temperature of the mixing reduction area to 800 °C through a heating furnace;

[0018] S3: Open cut-off valves 1 and 2, and simultaneously introduce argon and hydrogen. The argon will carry ReO 3 Vapor and MoO 3 Vapor into the mixing reduction area to react with hydrogen to be reduced to molybdenum-rhenium powder and settle in the collection area;

[0019] S4: The waste gas flows through the reflux channel and is introduced into water through the exhaust pipe to generate precipitation. After the precipitation stops, the reaction is completed. Turn off the heating furnace and cut-off valves 1 and 2, and collect the molybdenum-rhenium mixed powder.

[0020] Preferably, the unreacted ReO in step S3 3 vapor and MoO 3 vapor react fully with hydrogen in the reflux channel to be reduced to molybdenum rhenium powder, which falls to the bottom of the collection area.

[0021] Furthermore, the temperature in the collection area is set to 800 °C.

[0022] The present invention has the following beneficial effects:

[0023] (1) The device designed by the present invention sets up ReO 3 evaporation zone A and MoO 3 evaporation zone B to obtain ReO 3 gas and MoO 3 gas, enabling the two to be fully mixed and react in the mixing reduction zone, that is, by adopting the gas-gas mixing method to synchronize the reduction reaction. Relying on the characteristics of the free random movement and random distribution of different gas molecules, during the occurrence of the reduction reaction, different gases collide and intertwine with each other, achieving uniform distribution quickly and precisely at the molecular level, greatly improving the uniformity and fineness of the mixing. Moreover, as the mixing degree deepens, the contact area between the reactant gas and the substance to be reduced also increases significantly, more active sites are exposed, thereby strongly enhancing the reduction effect and obtaining molybdenum rhenium powder with more uniform composition;

[0024] (2) The gas phase environment ensures uniform material supply and reduces agglomeration, enabling particles to be generated independently and uniformly. Coupled with the ability to precisely control parameters such as reaction temperature, gas flow rate, time, and pressure manually through the heating furnace and stop valve, the gas molecules participating in the reaction can fully contact and react in a highly uniform and stable mixing environment. Compared with liquid-liquid mixing and solid-liquid mixing methods, there is no agglomeration problem caused by liquid shrinkage. Therefore, the generated powder exhibits uniform characteristics from a microscopic perspective and can reach the ultra-fine scale of the nanometer level, that is, this device can precisely control the particle size and distribution of the powder to ensure that the powder is nanoscale and uniform;

[0025] (3) The device of the present invention is arranged vertically, optimizing the space utilization while being more conducive to the natural flow of gas, reducing the airflow obstruction, creating good conditions for subsequent reactions. And the device precisely controls the on-off of the gas circuit and ensures the gas flows according to the set path and flow rate through the set stop valve, avoiding leakage and uneven mixing. Also, the pressure gauge set inside the evaporation zone is used to monitor the pressure to judge whether the evaporation is completed, facilitating the operator to adjust the reaction conditions and ensuring the stability and safety of the reaction;

[0026] (4) By designing a globe valve to control the air flow, setting up a reflux channel to increase the gas circuit, and combining the mixing zone with the reduction zone, it effectively solves the problem of insufficient gas mixing caused by the unreasonable design of each functional zone in the traditional chemical vapor deposition device, improves the yield of the product. Each circuit guides the high-temperature water vapor to flow upward, and the reduced molybdenum-rhenium powder settles downward under the action of gravity and air flow, effectively separating the two in space. Multiple circuits strengthen the separation effect, avoid the long-term mixing of the powder and water vapor, reduce the contact between oxygen elements and the powder, and thus significantly reduce the oxygen content of the finished powder, improving the product quality and purity;

[0027] (5) The production process is clean and pollution-free. In the past, the mechanical mixing and hydrogen reduction method used ammonium molybdate and ammonium rhenate as raw materials, so ammonia gas would be generated during the reduction process, and thus an additional gas recovery device was required. In this application, molybdenum trioxide and rhenium trioxide are used as raw materials, and the gas product obtained by mixing and hydrogen reduction is water vapor. Only the molybdenum trioxide and rhenium trioxide in the gas need to be precipitated, avoiding the generation of by-products that pollute the metal powder. It not only improves the yield of the product but also reduces the maintenance cost;

[0028] (6) The device of the present invention is simply arranged, and the operation process can achieve continuous production without complex manual operations in the middle, which can greatly improve work efficiency, promote the industrial production of molybdenum-rhenium mixed powder, and the vertically designed device extends the service life of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the gas-phase reduction preparation device of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0030] The following further describes the present invention in detail with specific embodiments, which are explanations rather than limitations of the present invention.

[0031] Refer to Figure 1 As shown, the present invention provides a device for gas-phase co-reduction to prepare high-homogeneity molybdenum-rhenium alloy powder, including a ReO 3 evaporation zone A, a MoO 3 evaporation zone B, a mixing and reduction zone, a collection zone, and an exhaust pipe. Pressure gauges A and B are respectively arranged inside the ReO 3 evaporation zone A and the MoO 3 evaporation zone B, and heating furnaces 1 and 2 are respectively arranged outside. The mixing and reduction zone is vertically tubular and a heating furnace 3 is arranged outside. The ReO 3 evaporation zone A and the MoO 3 evaporation zone B are respectively arranged on both sides of the top of the mixing and reduction zone and communicate with it. And the ReO 3 evaporation zone A and the MoO 3 evaporation zone B are both provided with Ar inlets on opposite sides.3 Evaporation zone A, MoO 3 Cut-off valves 1 and 2 for controlling gas flow are respectively arranged at the connections between evaporation zone B and both sides of the top of the mixed reduction zone. Moreover, an H is also arranged at the top of the mixed reduction zone 2 Input end, and the output end at the bottom of the mixed reduction zone is communicated with the collection zone. The collection zone includes an inner cavity and an outer cavity. The inner cavity is sleeved inside the outer cavity. A heating furnace 4 is arranged between the inner cavity and the outer cavity of the collection zone. And a reflux channel that enables the gas to flow downward and upward alternately twice is arranged at the connection between the collection zone and the mixed reduction zone. The reflux channel is formed by the interlacing of two arc plates with a certain distance coaxially arranged downward from the bottom opening of the mixed reduction zone and the arc-shaped top wall at the top of the inner cavity and the outer cavity of the collection zone. And the top of the reflux channel, that is, the channel gas outlet, is communicated with the exhaust pipe. The exhaust pipe is arranged on both sides of the top of the collection zone and is communicated with the collection zone. The bottom of the exhaust pipe leads into a container filled with water and is immersed in the water.

[0032] Working principle: Weigh the corresponding masses of molybdenum trioxide and rhenium trioxide as raw materials according to the composition of the molybdenum-rhenium alloy to be prepared, and heat them respectively to above their melting points to obtain MoO 3 Gas and ReO 3 Gas, realizing rapid and uniform diffusion at the molecular level, not affected by the differences in physical properties, significantly increasing the contact area between molecules, obtaining a uniform mixing effect, maintaining the temperature to mix MoO 3 Gas and ReO 3 Gas, and then introducing it into hydrogen for reduction to obtain a nanoscale molybdenum-rhenium mixed powder with uniform composition and uniform particle size. After molybdenum trioxide and rhenium trioxide sublime into gas and are reduced by hydrogen, water vapor will be generated during the process, but no other powdery by-products will be generated to affect the product purity. The reduction reaction equation involved in this device is: MoO 3 +3H 2 =Mo + 3H 2 O; ReO 3 +3H 2 =Re + 3H 2 O.

[0033] Preparation preparation; Calculate the masses of molybdenum trioxide and rhenium trioxide raw materials required and the amounts of hydrogen and argon to be introduced according to the proportions of molybdenum and rhenium in the molybdenum-rhenium alloy to be prepared.

[0034] Operation process:

[0035] Put the weighed rhenium trioxide raw material and molybdenum trioxide raw material into evaporation zone A of ReO 3 and evaporation zone B of MoO 3 respectively. Start heating furnace 1 and heating furnace 2 to heat evaporation zone A of ReO 3 and evaporation zone B of MoO 3The evaporation zone B is heated to 800 °C to obtain ReO 3 gas and MoO 3 gas. In fact, the melting point of rhenium trioxide is 400 °C. However, in order to ensure that both molybdenum trioxide and rhenium trioxide in the mixed reduction zone exist stably in the gaseous state and prevent molybdenum trioxide from condensing into solid particles and falling due to temperature reduction, then ReO 3 the evaporation zone A and MoO 3 the temperature of the evaporation zone B are both heated to 800 °C and maintained. If you want to accelerate the evaporation of the raw materials, you can appropriately increase the heating speed of the heating furnace 1 and the heating furnace 2. However, at the same time, you need to consider the heat loss and energy conservation issues.

[0036] Before the evaporation is completed, the mixed reduction zone needs to be kept in a vacuum state. If necessary, a vacuum pumping operation can be performed on it. And to prevent ReO 3 gas and MoO 3 gas from cooling and settling before being fully mixed, start the heating furnace 3 to preheat the temperature in the mixed reduction zone to 800 °C. Wait until ReO 3 the evaporation zone A and MoO 3 the evaporation zone B are fully evaporated, that is, ReO 3 the evaporation zone A and MoO 3 the pressure gauges A and B set inside the evaporation zone A and the evaporation zone B tend to stable values (indicating that the molybdenum trioxide and rhenium trioxide powders have been completely converted into steam), then open the stop valves 1 and 2, and blow a certain amount of argon gas from the Ar input end into ReO 3 the evaporation zone A and MoO 3 the evaporation zone B. The argon gas carries ReO 3 gas and MoO 3 gas to reach the mixed reduction zone. At the same time, continuously introduce hydrogen gas from the H 2 input end. During the process of the four gas flows flowing downward along the vertical tubular mixed reduction zone, they are fully mixed and reduced and gradually reduced to metallic rhenium and metallic molybdenum. From a macroscopic perspective, based on the thermal motion of gas molecules, during the reaction process, the gas molecules will quickly and stably approach the state of uniform distribution. This process enables the gas to achieve efficient mixing within a short time period, greatly improving the mixing efficiency, providing more favorable conditions for the subsequent reduction reaction, and ensuring that the reaction can proceed more fully and quickly. Therefore, during this period, argon gas and hydrogen gas need to be continuously filled to accelerate the diffusion of gas molecules and reduction. And according to the mass of the two oxides and the molar ratio of the reduction reaction formula to calculate the amount of hydrogen gas required, the actually introduced hydrogen gas needs to be slightly excessive, and the argon gas is equal to the hydrogen gas in quantity; since the melting points of metallic rhenium and metallic molybdenum are much higher than the reduction temperature, they thus form powders and settle in the inner cavity of the collection zone. To prevent ReO 3 gas and MoO 3The gas cools down and settles, and the heating furnaces 4 arranged on both sides in the collection area uniformly heat the collection area; while the water vapor, unreacted hydrogen, and unreacted ReO 3 gas, MoO 3 gas, and argon, carrying the unsettled molybdenum-rhenium powder, move along the green path of the reflux channel at the top of the collection area. The green path indicates that the gas will flow back down and up twice in the device. Each time the gas flows downward, the unreacted ReO 3 gas and MoO 3 gas can fully react with hydrogen to be reduced to molybdenum-rhenium powder. The successfully reduced molybdenum-rhenium powder and water vapor are separated and settled down into the inner cavity and outer cavity of the collection area, effectively reducing the oxygen content in the molybdenum-rhenium mixed powder. The water vapor and hydrogen are lighter and move upward, flow through the exhaust pipe and are introduced into water. Bubbles will emerge in the water and powder precipitation will occur until there are no more bubbles emerging in the container filled with water, indicating that the reaction is completed. Then, turn off the heating furnace 1, heating furnace 2, heating furnace 3, and heating furnace 4, and close the stop valve 1 and stop valve 2 to collect the molybdenum-rhenium mixed powder.

[0037] The gas path guided by the reflux channel set in this device effectively reduces the oxygen content in the molybdenum-rhenium powder while ensuring the reduction effect. And the waste gas generated in the above process is only water vapor, hydrogen, argon, and unreacted ReO 3 gas, MoO 3 gas. The waste gas is recovered by water. Since ReO 3 gas, MoO 3 gas is insoluble in water and will cool down to form powdery precipitation, while hydrogen and argon will overflow, avoiding air pollution and preventing oxygen in the air from entering the device to oxidize molybdenum and rhenium and affecting the reduction effect.

[0038] The above content is a further detailed description of the present invention in combination with specific embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these embodiments. For those of ordinary skill in the technical field of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can still be made, which should all be regarded as belonging to the protection scope of the present invention.

Claims

1. A device for preparing highly homogeneous molybdenum-rhenium alloy powder by gas phase co-reduction, characterized in that: It includes ReO3 evaporation zone A, MoO3 evaporation zone B, mixed reduction zone, collection zone and exhaust pipe. The mixed reduction zone is in the shape of a vertical tube. ReO3 evaporation zone A and MoO3 evaporation zone B are respectively arranged on both sides of the top of the mixed reduction zone and are connected thereto. Ar input terminals are arranged on the opposite sides of ReO3 evaporation zone A and MoO3 evaporation zone B, and a H2 input terminal is also arranged on the top of the mixed reduction zone. The output terminal at the bottom of the mixed reduction zone is connected with the collection zone. The exhaust pipe is arranged on both sides of the top of the collection zone, and the collection zone is connected with the exhaust pipe. The bottom of the exhaust pipe leads to a container filled with water and is immersed in the water.

2. The device for preparing highly homogeneous molybdenum-rhenium alloy powder by gas phase co-reduction according to claim 1, characterized in that: The evaporation zone A, evaporation zone B, mixed reduction zone and collection zone are all provided with heating furnaces.

3. The device for preparing highly homogeneous molybdenum-rhenium alloy powder by gas phase co-reduction according to claim 2, characterized in that: The collection area includes an inner cavity and an outer cavity, the inner cavity is sleeved inside the outer cavity and has an opening at the bottom, the mixed reduction area is connected to the inner cavity, the top of the inner cavity is connected to the outer cavity, the top of the outer cavity is connected to the exhaust pipe, and the heating furnace is evenly arranged between the inner cavity and the outer cavity.

4. The device for preparing highly homogeneous molybdenum-rhenium alloy powder by gas phase co-reduction according to claim 3, characterized in that: A reflux channel is provided at the connection between the collection zone and the mixed reduction zone, which enables the gas to flow alternately downward and upward multiple times. The reflux channel is composed of guide plates with a certain distance arranged downward from the bottom opening of the mixed reduction zone and the top walls of the inner cavity and outer cavity of the collection zone, which are interlaced and staggered. The reflux channel is connected to the exhaust pipe, and the exhaust pipe is located at the upper part of the collection zone.

5. The device for preparing highly homogeneous molybdenum-rhenium alloy powder by gas phase co-reduction according to claim 4, characterized in that: The guide plate and the top walls of the inner cavity and the outer cavity of the collection area are all arc-shaped plates.

6. The device for preparing highly homogeneous molybdenum-rhenium alloy powder by gas phase co-reduction according to claim 1, characterized in that: The connection points between the ReO3 evaporation zone A, the MoO3 evaporation zone B and both sides of the top of the mixed reduction zone are respectively provided with a stop valve 1 and a stop valve 2 for controlling the gas flow.

7. The device for preparing highly homogeneous molybdenum-rhenium alloy powder by gas phase co-reduction according to claim 1, characterized in that: Pressure gauges are provided inside the ReO3 evaporation zone A and the MoO3 evaporation zone B.

8. A method for preparing highly homogeneous molybdenum-rhenium alloy powder using the device as claimed in claim 1, characterized in that: The following steps are involved: S1: According to the molybdenum-rhenium alloy composition to be prepared, weigh the corresponding mass of ReO3 and MoO3, put them into ReO3 evaporation zone A and MoO3 evaporation zone B respectively, and heat them to 800°C in a heating furnace to generate ReO3 steam and MoO3 steam; S2: evacuate the mixed reduction zone to a vacuum state, and preheat the temperature of the mixed reduction zone to 800°C through a heating furnace; S3: Open stop valve 1 and stop valve 2, and introduce argon and hydrogen at the same time. Argon will carry ReO3 vapor and MoO3 vapor into the mixed reduction zone and react with hydrogen to reduce them into molybdenum-rhenium powder and settle in the collection zone; S4: The exhaust gas flows through the reflux channel and the exhaust pipe into the water to produce precipitation. When there is no more precipitation, the reaction is completed, and the heating furnace and stop valve 1 and stop valve 2 are closed to collect the molybdenum-rhenium mixed powder.

9. The method for preparing highly homogeneous molybdenum-rhenium alloy powder according to claim 8, characterized in that: In the step S3, the unreacted ReO3 vapor and MoO3 vapor fully react with the hydrogen in the reflux channel to be reduced to molybdenum-rhenium powder, which falls to the bottom of the collection area.

10. The method for preparing highly homogeneous molybdenum-rhenium alloy powder according to claim 9, characterized in that: The temperature in the collection zone is set to 800°C.

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