In-situ composite powder material preparation device and method based on gas acceleration synthesis

Abstract

The application discloses an inlaid composite powder material preparation device and method based on a gas acceleration synthesis method, and belongs to the field of material preparation, and at least comprises but is not limited to a main circulation pipeline, a particle grading device and a discharging pipeline; a particle acceleration structure is arranged in the main circulation pipeline; the particle grading device is connected with the main circulation pipeline; one end of the discharging pipeline is connected with a coarse particle separation outlet of the particle grading device, and the other end extends into a particle collision part of the main circulation pipeline; the device can realize screening and grading of reaction powder materials according to particle sizes, and then the reaction powder materials enter different circulation channels. The device can effectively control the acceleration time and distance of powder materials with different particle sizes in the gas flow field, and finally realizes collision of the powder materials with different particle sizes in the collision chamber at a large speed difference, so that the small particle size particles effectively and controllably invade and inlay the large particle size particles.

Description

Technical Field

[0001] This invention relates to the field of materials preparation, and in particular to an apparatus and method for preparing embedded composite powder materials based on gas-accelerated synthesis. Background Technology

[0002] Embedded composite powder structure such as Figure 1 As shown, this refers to a composite powder in which one or more other relatively smaller solid particles are relatively uniformly embedded on the surface and inside a relatively large solid particle. Because the different component particles of this type of powder have more thorough contact, the energy generated during the reaction under specific conditions is greater, and the reaction time is shorter, making it a promising candidate for applications in weaponry, aerospace, and metallurgy. Currently, the preparation of embedded composite powders mainly employs gas-accelerated synthesis. The basic principle is to introduce raw materials of different components into a high-speed gas flow according to a predetermined ratio. As the raw materials are carried by the high-speed gas flow, they are continuously accelerated through energy exchange. Due to differences in material, density, and size, a velocity difference gradually forms, relying on this difference to achieve repeated collisions between the raw materials, ultimately forming the target product. The target product is often not formed through a single collision; it usually requires repeated cyclical collisions between different component raw materials within a certain time frame.

[0003] Currently, there are two main types of devices for gas-accelerated synthesis: one is a single-cycle device, the structure of which is as follows: Figure 2 As shown, the device is a circulating structure, where 1 is the stabilization section, used to control the energy of the supersonic airflow; 2 is the supersonic nozzle, used to accelerate the airflow to supersonic speeds; 3 is the acceleration section, used for particle acceleration; 4 is the collision chamber, used for collision reactions of different raw materials; 5 is the target head, used for solid-phase particle collisions; 6 is the product recovery unit, used to recover products that meet the requirements; 7 is the circulation pipe, used for repeated cyclic collisions of solid-phase particles that do not meet the requirements; and 8 is the gas source, used to provide power for the airflow of the device. Its basic working principle is that particles, carried by the airflow, pass sequentially through the stabilization section, nozzle, and acceleration section. After colliding with the target head in the collision chamber, they pass through the circulation pipe. Products that meet the requirements are recovered by the recovery unit, while solid-phase particles that do not meet the requirements continue to accelerate and collide again along the circulation pipe until the requirements are met. The main difference between these devices lies in the different entry points of different component raw materials into the high-speed airflow. Either all raw materials enter together from the nozzle inlet or outlet, or, depending on the material, some enter from the nozzle inlet and others from the side wall of the nozzle expansion section. However, the general principle is that the velocity of all raw materials is in the same direction as the high-speed airflow. The problem is that the speed difference between different component materials accelerating in the same direction is limited, making it difficult to achieve the requirements of embedded structure. The only way to increase the speed difference is to increase the density difference and particle size difference between different component materials, but this is almost impossible to achieve for a given target product.

[0004] Another type is a dual-circulation device, the structure of which is as follows: Figure 2 As shown, the device also has a circulating structure, which can be considered as a symmetrical arrangement. 1 is the stabilization section, used to control the energy of the supersonic airflow; 2 is the supersonic nozzle, used to accelerate the airflow to supersonic speeds; 3 is the acceleration section, used for particle acceleration; 4 is the collision chamber, used for collision reactions of different raw materials; 5 is the product recovery unit, used to recover products that meet the conditions; 6 is the circulation pipe, used for repeated cyclic collisions of solid particles that do not meet the requirements; and 7 is the gas source, used to provide power for the airflow in the device. Different types of devices are derived based on different included angles Φ of the symmetrical structure, but their basic principle is the same: composite powder raw materials enter the airflow from the stabilization section and a certain position of the nozzle in the symmetrical structure, are accelerated by the airflow, complete collisions in the collision chamber, and then pass through the circulation pipe. Products that meet the requirements are recovered by the recovery unit, while the remaining particles return to the upstream of the collision chamber through the circulation pipes on both sides and are accelerated by the airflow, thus creating a cycle. The problem is that the airflow entering the collision chamber from both sides is supersonic. According to aerodynamic theory, a strong shock wave will inevitably be generated before the airflow collides. After passing through the shock wave, the speed of the high-speed particles will decrease sharply. The energy generated by the collision at the reduced speed may not be sufficient to achieve the requirements of the embedded structure.

[0005] Existing technologies, whether single-circulation or dual-circulation devices, essentially involve the acceleration and collision of mixed particles. In a single-circulation device, due to the mixing and acceleration of particles of different components, although the absolute velocity of the particles may be high, the relative velocity between them is relatively low. In a dual-circulation device, although the particles from both sides move towards each other, resulting in a large velocity difference before collision, they both undergo shock wave deceleration before impact. The smaller the particle size, the greater the velocity reduction after the shock wave. Since both sides consist of mixed particles, after shock wave deceleration, larger particles maintain a slightly higher velocity, while smaller particles maintain a lower velocity. The composite powder generated by the collision of large and small particles with this velocity difference may not achieve ideal embedding. Summary of the Invention

[0006] The purpose of this invention is to provide an apparatus and method for preparing embedded composite powder materials based on gas-accelerated synthesis, addressing the above-mentioned shortcomings. This solves the problem that in the prior art, the embedded composite powder structure consists of accelerated collisions of mixed particles, and the velocity difference between particles of different sizes is insufficient to meet the requirements for embedded composite powder, thus lacking mass production capability.

[0007] This invention is achieved through the following scheme:

[0008] An embedded composite powder material preparation device based on gas-accelerated synthesis method includes, but is not limited to, a main circulation pipeline, a particle classification device, and a feeding pipeline; a particle acceleration structure is provided in the main circulation pipeline, the particle classification device is connected to the main circulation pipeline, one end of the feeding pipeline is connected to the coarse particle separation outlet of the particle classification device, and the other end extends into the particle collision section of the main circulation pipeline.

[0009] Based on the above-mentioned embedded composite powder material preparation device based on gas-accelerated synthesis, the main circulation pipeline includes a stabilization section, an ultrasonic jet section, an acceleration section, a collision chamber, a circulation pipeline, and a gas source; the stabilization section, ultrasonic jet section, acceleration section, collision chamber, and circulation pipeline are sequentially connected to form a loop; the gas source is located on the front sidewall of the stabilization section; the particle classification device is connected to the circulation pipeline; the particle classification device includes multiple outlet ends, including at least a fine particle outlet and a coarse particle outlet; the coarse particle outlet is connected to the feeding pipeline; the fine particle outlet is connected to the circulation pipeline; the outlet end of the feeding pipeline extends into the collision chamber.

[0010] Based on the above-mentioned embedded composite powder material preparation device based on gas-accelerated synthesis method, a product recovery device is also provided in the main circulation pipeline, and the product recovery device is installed in the circulation pipeline.

[0011] Based on the above-mentioned embedded composite powder material preparation device based on gas-accelerated synthesis method, the particle classification device is provided with a product particle outlet, which is connected to a product recovery device.

[0012] Based on the above-mentioned embedded composite powder material preparation device based on gas acceleration synthesis method, the outlet end of the feeding pipe is set close to the airflow axis of the accelerated particle flow; the end of the feeding pipe extending to the collision chamber has a streamlined shape, and the feeding pipe is set perpendicular to the streamline of the accelerated particle flow.

[0013] Based on the above-mentioned embedded composite powder material preparation device based on gas-accelerated synthesis, a target head is set in the collision chamber and positioned downstream of the feed pipe; the target head is determined by CFD theoretical calculation to establish a uniform flow field; this position is one that will not cause airflow blockage.

[0014] Based on the above-mentioned embedded composite powder material preparation device based on gas-accelerated synthesis method, the inner wall of the feeding pipe should be smooth and without steps, and the feeding pipe should be arranged vertically as much as possible.

[0015] Based on the above-mentioned embedded composite powder material preparation device based on gas-accelerated synthesis method, the inner surface of the feed pipe from the particle classification device to the outlet is set to be straight or gradually narrowed, and the inlet pressure of the pipe at the particle classification device is greater than the outlet pressure.

[0016] This solution provides a method for preparing embedded composite powder materials based on gas-accelerated synthesis, including the following steps:

[0017] Step 1: Weigh out a predetermined amount of the original solid particles according to the proportion of different components in the product;

[0018] Step 2: Driven by an air source, create a supersonic circulating airflow within the main circulation pipeline;

[0019] Step 3: Feed a certain proportion of solid particles into a stable flow field through an auxiliary airflow to form a gas-solid two-phase flow. Small particles are fed from the upstream position of the stabilization section, the supersonic nozzle, or the acceleration section, while large particles can be fed through the feed port set in the large particle feeding pipe.

[0020] Step 4: Small particles are accelerated to supersonic speed through the stabilization section, supersonic nozzle, or acceleration section; large particles enter the collision chamber through the auxiliary airflow and the discharge pipe outlet; particles of different sizes with different speeds collide in the collision chamber and then enter the circulation pipe.

[0021] Step 5: When the mixed particles pass through the classifier in the circulation pipe, they are classified according to particle size. Larger particles enter the large particle discharge pipe, while the remaining particles continue to circulate in the circulation pipe.

[0022] Step 6: When the remaining particles pass through the recycling device, the mixed particles that meet the requirements are recycled, and the remaining particles continue to enter the stable flow field again through the circulation pipeline to complete the circulation reaction;

[0023] Step 7: After the preparation process is completed, turn off the gas source and recover the product.

[0024] In step one, the original solid particles are one or more of the following: elemental powders of aluminum, nickel, tungsten, copper, iron, zinc, titanium, calcium, zinc, lithium, carbon, silicon, phosphorus, and sulfur, or oxides, sulfates, nitrates, acetates, carbonates, chlorides, or hydrates of metals.

[0025] In step two, the gas flow medium is one or more of nitrogen, argon, and air.

[0026] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0027] 1. This design enables the screening and grading of reaction powder materials according to particle size, allowing them to enter different circulation channels. It effectively controls the acceleration time and distance of powder materials of different particle sizes in the airflow field, ultimately achieving a collision in the collision chamber with a large velocity difference, thus enabling effective and controllable intrusion and embedding of smaller particles into larger particles.

[0028] 2. The preparation apparatus designed in this scheme has no special requirements on the type of raw materials used; it can process and react organic and inorganic materials to prepare materials. Simultaneously, the equipped gas heater enables gas flow temperature control, ultimately controlling the temperature field within the reaction chamber to achieve material preparation at specific temperatures. Furthermore, it can also prepare plasma materials as needed.

[0029] 3. The preparation apparatus designed in this scheme can form an ultra-high-speed flow field with a specific atmosphere, creating a protective atmosphere to prevent the oxidation of active metal raw materials by oxygen, while controlling the oxygen content of the product. Simultaneously, using supersonic airflow as the mechanical energy transfer medium effectively avoids the shortcomings of ball milling methods in terms of introducing impurities from grinding balls and grinding slurry.

[0030] 4. The preparation apparatus involved in this scheme produces products with fine particle size, uniform distribution, similar morphology, few impurities, high density, good dispersibility, and no obvious agglomeration. After different raw material components have completed their infiltration, they can form a special embedded composite powder hierarchical structure. The embedded composite structure effectively reduces the contact distance between different components, enhances the interfacial contact between them, increases the contact area, and strengthens energy and mass transfer. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of an embedded composite powder structure.

[0032] Figure 2 This is a schematic diagram of a single-cycle device.

[0033] Figure 3 This is a schematic diagram of the dual-circulation device.

[0034] Figure 4 This is a schematic diagram illustrating the overall principle of the present invention;

[0035] Figure 5 This is a schematic diagram showing the position of the target head;

[0036] The markings in the diagram are: 100, main circulation pipeline; 200, particle classification device; 300, feed pipeline; 101, stabilization section; 102, supersonic spray section; 103, acceleration section; 104, collision chamber; 105, circulation pipeline; 106, air source; 107, product recovery device; 108, target head; 109, large particles; 110, small particles. Detailed Implementation

[0037] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0038] Any feature disclosed in this specification (including any appended claims and abstract) may be replaced by other equivalent or similar features, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.

[0039] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a predetermined orientation, or be constructed and operated in a predetermined orientation. Therefore, they should not be construed as limitations on this invention.

[0040] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature.

[0041] Example 1

[0042] like Figures 4-5 As shown, the present invention provides a technical solution:

[0043] An embedded composite powder material preparation device based on gas-accelerated synthesis method includes, but is not limited to, a main circulation pipeline 100, a particle classification device 200, and a feeding pipeline 300; a particle acceleration structure is provided in the main circulation pipeline 100, the particle classification device is connected to the main circulation pipeline 100, one end of the feeding pipeline is connected to the coarse particle separation outlet of the particle classification device, and the other end extends into the particle collision section of the main circulation pipeline 100.

[0044] Based on the above structure, the particles in the main circulation pipeline 100 are accelerated by a particle acceleration structure. A particle classification device separates coarse particles in the main circulation pipeline 100, and the separated particles enter the particle collision section of the main circulation pipeline 100 through the feed pipe 300. Small particles 110 are accelerated to supersonic speeds in the main circulation pipeline 100, while large particles 109 enter the particle collision section with zero initial velocity. This creates a greater velocity difference between the small particles 110 and the large particles 109, thereby increasing the relative velocity difference between particles of different sizes. This resolves the contradiction that small velocity differences prevent the bombardment construction of embedded injection structures. This improves the yield and efficiency of embedded structure particles in the composite powder.

[0045] As an example, the main circulation pipeline 100 may include a stabilization section 101, a supersonic jet section 102, an acceleration section 103, a collision chamber 104, a circulation pipeline 105, and an air source 106; the stabilization section 101, the supersonic jet section 102, the acceleration section 103, the collision chamber 104, and the circulation pipeline 105 are sequentially connected to form a loop; the air source 106 is located on the front side wall of the stabilization section 101, and a particle classification device is connected to the circulation pipeline 105. The particle classification device includes multiple outlet ends, including at least a fine particle outlet and a coarse particle outlet; the coarse particle outlet is connected to the feed pipeline 300; the fine particle outlet is connected to the circulation pipeline 105; the outlet end of the feed pipeline 300 extends into the collision chamber 104.

[0046] A product recovery device 107 may also be installed in the main circulation pipeline 100. The product recovery device 107 is installed in the circulation pipeline 105 and is used to recover the embedded structure particles of the composite powder that meet the conditions.

[0047] As a more specific embodiment, the particle classification device may be provided with a product particle outlet, which is connected to the product recovery unit 107.

[0048] In this embodiment, the stabilization section 101 is used to control the energy of the supersonic airflow; the supersonic nozzle is used to accelerate the airflow to supersonic speed; the acceleration section 103 is used to accelerate particles; the collision chamber 104 is used for collision reactions of different raw materials; the classification device is used to separate particles of different sizes; the product recovery device 107 is used to recover products that meet the conditions; the circulation pipe 105 is used for repeated circulation collisions of solid particles that do not meet the requirements; the air source 106 is used to provide power for the airflow of the device; and the discharge pipe 300 is used for large-diameter particles separated from the classification device to enter the collision chamber 104.

[0049] As an example, the outlet end of the feed pipe 300 is positioned close to the airflow axis of the accelerated particle stream.

[0050] Based on the above structure, extending the feed pipe 300 into the collision chamber 104, especially to the axis of the particle flow, can ensure that after the large particles 109 are fed into the collision chamber 104 from the outlet, they can collide with the small particles 110 that have a higher velocity due to their proximity to the core flow, thereby improving the expansion efficiency.

[0051] As an example, the end of the discharge pipe 300 extending into the collision chamber 104 has a streamlined shape, and the discharge pipe 300 can be set perpendicular to the streamline of the accelerated particle stream.

[0052] Based on the above structure, setting the end of the feed pipe 300 to be streamlined can avoid generating complex wave systems that affect the supersonic flow characteristics of the small particles 110; at the same time, feeding the feed pipe in a direction perpendicular to the particle flow can make the fed large particles 109 have a lower axial velocity, thus making the particle flow velocity difference between the large and small particles 110 greater.

[0053] As an example, a target head 108 can be set in the collision chamber 104, and the target head 108 is located downstream of the feed pipe 300; and the position of the target head 108 is determined by CFD theoretical calculation to establish a uniform flow field; this position is a position that will not cause airflow blockage.

[0054] Based on the above structure, in order to increase collision efficiency, a target head 108 is set at the downstream position of the feeding pipe 300. After some particles collide with the target head 108, they rebound and collide with the upstream particles a second time, increasing the collision probability and effect. At the same time, the position of the target head 108 is specially set. If the target head 108 is too close to the outlet of the feeding pipe 300, the shock wave in front of the target head 108 will cause a sudden jump in the outlet pressure, affecting the feeding of large particles 109 in the feeding pipe 300. If the distance is too far, the large particles 109 in the feeding pipe 300 will bypass the target head 108 and fly downstream, unable to collide with small particles 110. Therefore, it is necessary to use CFD theory calculation to establish a uniform flow field to determine the collision efficiency.

[0055] As an example, the outlet of the feeding pipe 300 can be a supersonic airflow in the opposite direction of the airflow. In this case, the outlet needs to be close to the airflow axis, and since the outlet faces the wind, a drive unit needs to be set up to drive the large particles 109 to be fed into the collision chamber 104 from the outlet.

[0056] As an example, the inner wall of the feeding pipe 300 should be smooth and without steps to avoid the accumulation of solid particles and affect the raw material ratio; and the feeding pipe 300 should be arranged vertically as much as possible to ensure that large particles 109 can obtain a better effect of flowing with the airflow to the collision chamber 104 through gravity.

[0057] The inner surface of the feed pipe 300 from the particle classifier 200 to the outlet should be designed to be straight or gradually narrow, and the inlet pressure of the pipe at the particle classifier 200 should be greater than the outlet pressure, i.e., a pressure gradient, to ensure the airflow direction and allow large particles 109 to pass smoothly through the pipe and enter the collision chamber 104.

[0058] Example 2

[0059] This invention provides a technical solution:

[0060] A method for preparing embedded composite powder materials based on gas-accelerated synthesis includes the following steps:

[0061] Step 1: Weigh out a predetermined amount of the original solid particles according to the proportion of different components in the product;

[0062] Step 2: Driven by air source 106, a supersonic circulating airflow is formed in the main circulation pipeline 100;

[0063] Step 3: A certain proportion of solid particles are fed into a stable flow field through an auxiliary airflow to form a gas-solid two-phase flow. Among them, small particles 110 are fed from the upstream position of the stabilization section 101, the supersonic nozzle, or the acceleration section 103, and large particles 109 can be fed through the feed port set in the large particle 109 feed pipe 300.

[0064] Step 4: Small particles 110 are accelerated to supersonic speed through stabilization section 101, supersonic nozzle or acceleration section 103; large particles 109 enter the collision chamber 104 through the auxiliary airflow and the outlet of the feeding pipe 300; particles 110 of different sizes and speeds collide in the collision chamber 104 and then enter the circulation pipe 105.

[0065] Step 5: When the mixed particles pass through the classifier in the circulation pipe 105, they are classified according to particle size. Large particles 109 enter the large particle 109 discharge pipe 300, and the remaining particles continue to circulate in the circulation pipe 105.

[0066] Step 6: When the remaining particles pass through the recycling device, the mixed particles that meet the requirements are recycled, and the remaining particles continue to enter the stable flow field again through the circulation pipe 105 to complete the circulation reaction.

[0067] Step 7: After the preparation process is completed, turn off the gas source 106 and recover the product.

[0068] In step one, the original solid particles are one or more of the following: elemental powders of aluminum, nickel, tungsten, copper, iron, zinc, titanium, calcium, zinc, lithium, carbon, silicon, phosphorus, and sulfur, or metal oxides, sulfates, nitrates, acetates, carbonates, chlorides, or their hydrates; preferably, elemental powders of aluminum, nickel, copper, and zinc.

[0069] In step two, the gas flow medium is one or more of nitrogen, argon, and air, preferably nitrogen, and more preferably argon, in order to avoid the formation of an oxide layer on the surface of the raw material by oxygen, which would affect the purity of the product. At the same time, the high temperature that may be generated when the wall particles collide could cause the raw material to react with oxygen and explode.

[0070] Compared with traditional single-cycle supersonic airflow acceleration devices, this method designs a dual-cycle system and corresponding method. Compared with previous mixed particle acceleration and collision, it realizes the separation of particles of different sizes. Small particles 110 obtain supersonic speed through acceleration, while large particles 109 remain "stationary", thus obtaining a high collision speed between particles of different sizes 110, which is conducive to realizing embedded powder structures.

[0071] Example 3

[0072] This example provides a specific verification example:

[0073] This embodiment uses a dual-cycle collision reaction device, such as... Figure 4 As shown, the selected raw material powder is accelerated by the airflow field, collides with each other in the collision chamber 104, and impacts the target head 108 to complete the solid-phase reaction. After being screened by the classification unit according to particle size, it enters different circulation loops to complete the classification. The product that meets the target requirements enters the collection unit after classification, while the unreacted material re-enters the airflow field for acceleration and reaction according to the particle size difference. After the system has been running in a cycle for a period of time, it is stopped to collect the product.

[0074] The dual-circulation collision device used in this embodiment of the invention is a gas acceleration synthesis device designed and developed by the author. The main body of the device is made of stainless steel, the circulation channel is a PVC hose with steel wire, and the inner diameter of the pipe is 150mm.

[0075] The airflow control valve of the dual-circulation collision system was opened to form a stable ultra-high-speed airflow field. 10g of aluminum powder (D90=100μm) and 10g of tungsten powder (D90=2μm) were weighed, mixed evenly, and added to the system's feeding hopper. The metering device attached to the feeding hopper was activated, and the reaction powder was continuously and uniformly added to the collision system at a rate of 2kg / h. After the first acceleration and target impact, the aluminum-tungsten mixed particles were sieved in the classification unit after the exhaust port. Small-diameter tungsten particles were conveyed through the first circulation channel to the feed pipe after the feeding hopper, where they re-entered the airflow field for accelerated motion; large-diameter aluminum particles were conveyed through the second circulation channel to the nozzle and impacted the target head 108 in front of the chamber, colliding with the axially supersonic small-diameter particles. After the dual-circulation collision system ran for 10 minutes, the prepared composite powder was collected. XRD characterization showed that the composite powder was a single-crystal mixture of aluminum and tungsten, without the formation of an alloy phase. SEM characterization revealed that the composite powder exhibited an embedded structure and a spherical morphology. Laser particle size analysis showed that the average particle size of the composite powder was approximately 90 μm.

[0076] Example 4

[0077] This example provides a specific verification example:

[0078] This embodiment uses a dual-cycle collision reaction device, such as... Figure 4 As shown, the selected raw material powder is accelerated by the airflow field, collides with each other in the collision chamber 104, and impacts the target head 108 to complete the solid-phase reaction. After being screened by the classification unit according to particle size, it enters different circulation loops to complete the classification. The product that meets the target requirements enters the collection unit after classification, while the unreacted material re-enters the airflow field for acceleration and reaction according to the particle size difference. After the system has been running in a cycle for a period of time, it is stopped to collect the product.

[0079] The dual-circulation collision device used in this embodiment of the invention is a gas acceleration synthesis device designed and developed by the author. The main body of the device is made of stainless steel, the circulation channel is a PVC hose with steel wire, and the inner diameter of the pipe is 150mm.

[0080] Open the airflow control valve of the dual-circulation collision system to form a stable ultra-high-speed airflow field. Weigh 10g (particle size D90=10μm) of aluminum powder and 10g (particle size D90=2μm) of molybdenum trioxide powder, mix them evenly, and add them to the system's feeding hopper. Start the quantitative feeding device attached to the feeding hopper to continuously and uniformly add the reaction powder into the collision system at a rate of 2kg / h. The aluminum and molybdenum trioxide mixed powder enters the airflow field and is accelerated to a supersonic state through the nozzle. After impacting the target head 108 in the impact chamber, it enters the classification unit through the exhaust port. In the classification unit, the mixed powder is sieved according to particle size. Small-diameter molybdenum trioxide particles are transported to the front of the airflow field through the first circulation channel and re-enter the airflow field through the feed pipe inlet for accelerated motion. Large-diameter aluminum particles are transported to the rear of the airflow field through the second circulation channel and enter the airflow field in front of the target head 108 in the impact chamber after the nozzle, where they collide with the axially supersonic small-diameter particles. After the dual-circulation collision system runs for 10 minutes, collect the prepared composite powder. XRD characterization revealed that the composite powder was a single-crystal mixture of aluminum and molybdenum trioxide, without the formation of an alloy phase. SEM characterization showed that the composite powder exhibited an embedded structure and a spherical morphology. Laser particle size analysis showed that the average particle size of the obtained composite powder was approximately 9 μm.

[0081] Example 5

[0082] This example provides a specific verification example:

[0083] This embodiment uses a dual-cycle collision reaction device, such as... Figure 4 As shown, the selected raw material powder is accelerated by the airflow field, collides with each other in the collision chamber 104, and impacts the target head 108 to complete the solid-phase reaction. After being screened by the classification unit according to particle size, it enters different circulation loops to complete the classification. The product that meets the target requirements enters the collection unit after classification, while the unreacted material re-enters the airflow field for acceleration and reaction according to the particle size difference. After the system has been running in a cycle for a period of time, it is stopped to collect the product.

[0084] The dual-circulation collision device used in this embodiment of the invention is a gas acceleration synthesis device designed and developed by the author. The main body of the device is made of stainless steel, the circulation channel is a PVC hose with steel wire, and the inner diameter of the pipe is 150mm.

[0085] Open the airflow control valve of the dual-circulation collision system to form a stable ultra-high-speed airflow field. Weigh 10g (particle size D90=10μm) of aluminum powder, 10g (particle size D90=2μm) of tungsten powder, and 10g (particle size D90=2μm) of molybdenum trioxide powder, mix them evenly, and add them to the system's feeding hopper. Start the quantitative feeding device attached to the feeding hopper to continuously and uniformly add the reaction powder into the collision system at a rate of 2kg / h. The mixed powder particles enter the airflow field and are accelerated to a supersonic state through the nozzle. After impacting the target head 108 in the impact chamber, they enter the classification unit through the exhaust port. In the classification unit, the mixed powder is sieved according to particle size. Small-diameter particles are transported to the front of the airflow field through the first circulation channel and re-enter the airflow field through the feed pipe inlet for accelerated motion. Large-diameter particles are transported to the rear of the airflow field through the second circulation channel and enter the airflow field in front of the target head 108 in the impact chamber after the nozzle, where they collide with the axially supersonic small-diameter particles. After running the dual-cycle impaction system for 10 minutes, the prepared composite powder was collected. XRD characterization showed that the composite powder was a single-crystal mixture of aluminum, tungsten, and molybdenum trioxide, without the formation of an alloy phase. SEM characterization showed that the composite powder exhibited an embedded structure and a spherical morphology. Laser particle size analysis revealed that the average particle size of the obtained composite powder was approximately 9 μm.

[0086] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An embedded composite powder material preparation device based on gas-accelerated synthesis, characterized in that: The system includes a main circulation pipeline, a particle classification device, and a feeding pipeline. A particle acceleration structure is installed in the main circulation pipeline. The particle classification device is connected to the main circulation pipeline. One end of the feeding pipeline is connected to the coarse particle separation outlet of the particle classification device, and the other end extends into the particle collision section of the main circulation pipeline. The main circulation pipeline includes a stabilization section, a supersonic jet section, an acceleration section, a collision chamber, a circulation pipeline, and an air source. The stabilization section, supersonic jet section, acceleration section, collision chamber, and circulation pipeline are sequentially connected to form a loop. The air source is located on the front sidewall of the stabilization section. The particle classification device is connected to the circulation pipeline and includes multiple outlets, including at least a fine particle outlet and a coarse particle outlet. The coarse particle outlet is connected to the feeding pipeline. The fine particle outlet is connected to the circulation pipeline. The outlet end of the feeding pipeline extends into the collision chamber. The outlet end of the feeding pipe is located close to the airflow axis of the accelerated particle stream; the end of the feeding pipe extending into the collision chamber has a streamlined shape, and the feeding pipe is arranged perpendicular to the streamline of the accelerated particle stream. A target head is set in the collision chamber, and the target head is located downstream of the feed pipe; the target head is determined by CFD theoretical calculation to establish a uniform flow field; this position is a position that will not cause airflow blockage.

2. The embedded composite powder material preparation device based on gas-accelerated synthesis method as described in claim 1, characterized in that: The main circulation pipeline is also equipped with a waste recovery device, which is located in the circulation pipeline.

3. The embedded composite powder material preparation device based on gas-accelerated synthesis method as described in claim 1, characterized in that: The particle classification device is provided with a product particle outlet, which is connected to a product recovery unit.

4. The embedded composite powder material preparation device based on gas-accelerated synthesis method as described in claim 1, characterized in that: The inner wall of the feeding pipe should be smooth and without steps, and the feeding pipe should be arranged vertically as much as possible.

5. The embedded composite powder material preparation device based on gas-accelerated synthesis method as described in claim 4, characterized in that: The inner surface of the feed pipe from the particle classifier to the outlet is set to be straight or gradually narrowing, and the inlet pressure of the pipe is greater than the outlet pressure of the particle classifier.

6. A method for preparing embedded composite powder materials based on gas-accelerated synthesis, comprising the apparatus for preparing embedded composite powder materials based on gas-accelerated synthesis as described in any one of claims 1 to 5, characterized in that: Includes the following steps: Step 1: Weigh out a predetermined amount of the original solid particles according to the proportion of different components in the product; Step 2: Driven by an air source, create a supersonic circulating airflow within the main circulation pipeline; Step 3: Feed a certain proportion of solid particles into a stable flow field through an auxiliary airflow to form a gas-solid two-phase flow. Small particles are fed from the upstream position of the stabilization section, the supersonic nozzle, or the acceleration section, while large particles can be fed through the feed port set in the large particle feeding pipe. Step 4: Small particles are accelerated to supersonic speed through the stabilization section, supersonic nozzle, or acceleration section; large particles enter the collision chamber through the auxiliary airflow and the discharge pipe outlet; particles of different sizes with different speeds collide in the collision chamber and then enter the circulation pipe. Step 5: When the mixed particles pass through the classifier in the circulation pipe, they are classified according to particle size. Larger particles enter the large particle discharge pipe, while the remaining particles continue to circulate in the circulation pipe. Step 6: When the remaining particles pass through the recycling device, the mixed particles that meet the requirements are recycled, and the remaining particles continue to enter the stable flow field again through the circulation pipeline to complete the circulation reaction; Step 7: After the preparation process is completed, turn off the gas source and recover the product.

7. The method for preparing embedded composite powder materials based on gas-accelerated synthesis as described in claim 6, characterized in that: In step one, the original solid particles are one or more of the following: elemental powders of aluminum, nickel, tungsten, copper, iron, zinc, titanium, calcium, zinc, lithium, carbon, silicon, phosphorus, and sulfur, or oxides, sulfates, nitrates, acetates, carbonates, chlorides, or hydrates of metals. In step two, the gas flow medium is one or more of nitrogen, argon, and air.

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