Preparation device and preparation method of refractory metal composite pipe

Abstract

The invention provides a preparation device and a preparation method of a refractory metal composite pipe, and relates to the technical field of metal composite pipes. The device comprises a shaping assembly which comprises a shaping cylinder provided with an interlayer, an opening communicated with the interlayer is formed in the shaping cylinder, and the inner wall of the shaping cylinder is made of elastic materials; the supporting and pressing assembly comprises a first rotating sleeve arranged on the threaded rod in a sleeving mode and rotationally matched with the threaded rod, and a second rotating sleeve arranged on the threaded rod in a sleeving mode and matched with the threaded rod in a threaded mode; the multiple supporting rods are circumferentially hinged to the second rotating sleeve, a supporting plate is hinged to the ends, away from the second rotating sleeve, of the supporting rods, and the supporting plate is detachably connected with the shaping cylinder; the connecting rod is hinged to the first rotating sleeve in the circumferential direction, a sliding groove is formed in the supporting rod, and the connecting rod penetrates through the sliding groove and is in sliding fit with the supporting plate. According to the preparation device, the supporting and pressing assembly is used for supporting, pressing and shaping the refractory metal powder in the interlayer of the shaping cylinder, the uniformity of the refractory metal powder is improved, and then the strength of the pipe is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of metal composite pipes, and in particular to a preparation device and a preparation method for a refractory metal composite pipe. Background Art

[0002] Refractory metals and their alloys have advantages such as high melting points and high high-temperature strength, making them important high-temperature structural materials. The operating temperature of refractory metals and their alloys is directly related to their melting points. Currently, molybdenum alloys, tungsten alloys, and niobium alloys are more commonly used. Due to the shortcomings of refractory metals and their alloys, such as low-temperature brittleness, welding brittleness, processing difficulties, and poor high-temperature oxidation resistance, in order to improve these shortcomings, an appropriate amount of second-phase reinforcing particles (rare earth oxides or ceramic phases) are usually added to the refractory metals and their alloys to form refractory metal composites. The performance of refractory metal composites is significantly higher than that of refractory alloys.

[0003] At present, in the process of preparing refractory metal composite materials (refractory metal powder) to form refractory metal composite pipes, the refractory metal powder needs to be statically pressed layer by layer. However, during the static pressing process, the uniformity of the refractory metal powder cannot be fully guaranteed, resulting in uneven pipe wall thickness after subsequent pipe forming, which reduces the strength of the pipe.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute prior art known to ordinary technicians in the field. Summary of the Invention

[0005] In view of this, a preparation device and preparation method for refractory metal composite pipes are provided. The preparation device uses a stretching and pressing component to stretch and press the refractory metal powder in the shaping component, thereby improving the uniformity of the refractory metal powder and thus enhancing the strength of the pipe.

[0006] Other features and advantages of the present disclosure will become apparent from the following detailed description, or may be learned in part by practice of the present disclosure.

[0007] According to one aspect of the present disclosure, a device for preparing a refractory metal composite pipe is provided, the device comprising: A bottom plate, to which a first fixing block and a second fixing block are fixedly connected; A driving assembly comprising a driving member and a threaded rod, wherein the driving member is fixed to the first fixing block, and an output shaft of the driving member passes through the second fixing block and is connected to the threaded rod; A shaping assembly comprises a shaping cylinder, wherein an interlayer is provided in the shaping cylinder, an opening communicating with the interlayer is provided on the shaping cylinder, and an inner wall of the shaping cylinder is made of an elastic material; The support and pressure assembly includes a first rotating sleeve, a second rotating sleeve, a support rod, a support plate, and a connecting rod; wherein the first rotating sleeve is sleeved on one end of the threaded rod, and the second rotating sleeve is sleeved on the other end of the threaded rod and threadably engaged with the threaded rod; a plurality of the support rods are circumferentially hinged to the second rotating sleeve, and one end of the support rod away from the second rotating sleeve is hinged to the support plate, the shaping cylinder is located on the movement path of the support plate, and when the support plate abuts against the shaping cylinder, the support plate can apply pressure to the shaping cylinder; The connecting rod is circumferentially hinged to the first rotating sleeve, and a sliding groove is provided on the support rod. The connecting rod passes through the sliding groove and is slidably matched with the support plate.

[0008] In an exemplary embodiment of the present disclosure, a blowing assembly is further included, which includes a piston cylinder fixed on the base plate, and the piston cylinder is provided with an air inlet and an air outlet, and the air outlet is connected to the opening of the shaping cylinder through an air pipeline.

[0009] In an exemplary embodiment of the present disclosure, the blowing assembly further comprises: A cam fixed to the output shaft of the driving member; a piston head, the piston head being slidably fitted in the piston cylinder; A push rod, one end of which is hinged to the piston head, and the other end of which is hinged to the cam.

[0010] In an exemplary embodiment of the present disclosure, it further includes: The controller is fixedly connected to the base plate and is used to control the operation of the driving member.

[0011] In an exemplary embodiment of the present disclosure, it further includes: The electromagnet is fixed on the first rotating sleeve and is magnetically connected to the threaded rod.

[0012] According to another aspect of the present disclosure, a method for preparing a refractory metal composite pipe is provided. Using the above-mentioned preparation device, the preparation method comprises: Step S1, preparing refractory metal powder according to the number of layers of the required composite pipe and the metal composition of each layer, and pre-treating the refractory metal powder; Step S2: putting the refractory metal powder into the shaping cylinder, and driving the threaded rod to rotate by the driving member, thereby driving the second rotating sleeve to move axially, so that the support plate supports and presses the powder to shape it, and the connecting rod slides along the slide groove to adjust the support angle; Step S3, placing the pressed tube in a sintering furnace and pre-sintering it at a preset temperature, a preset gas environment, and a preset holding time; Step S4, placing the pre-sintered tube in a hot isostatic pressing furnace for densification treatment; Step S5: machining the densified pipe.

[0013] In an exemplary embodiment of the present disclosure, the preparation device further includes an electromagnet fixed on the first rotating sleeve, and in step S2, further includes: The first rotating sleeve is driven to rotate the shaping cylinder by the magnetic force cooperation between the electromagnet and the threaded rod, so that the refractory metal powder is evenly distributed in the shaping cylinder.

[0014] In an exemplary embodiment of the present disclosure, the preparation device further includes an air blowing component, and in step S2, further includes: The gas is delivered into the interlayer through the air blowing assembly to assist in adjusting the distribution uniformity of the refractory metal powder.

[0015] In an exemplary embodiment of the present disclosure, in step S4, the temperature of the densification treatment is 1800°C-2200°C.

[0016] In an exemplary embodiment of the present disclosure, in step S1, the refractory metal powder is pre-treated, including: screening, drying and / or mixing the refractory metal powder.

[0017] The present disclosure provides a preparation device for refractory metal composite pipes. When preparing refractory metal composite pipes, refractory metal powder is placed in the interlayer of a shaping cylinder to shape the refractory metal powder. When the refractory metal powder is shaped, the threaded rod is driven to rotate by a driving component, and the second rotating sleeve moves along the thread direction of the threaded rod, thereby driving the support rod to push the support plate toward the inner wall of the shaping cylinder and to support and press the inner wall of the shaping cylinder, so that the refractory metal powder in the interlayer of the shaping cylinder is supported and pressed to shape. At the same time, the threaded rod drives the first rotating sleeve to rotate, thereby The shaping cylinder is caused to rotate, and the refractory metal powder is further evenly distributed through the action of centrifugal force. The threaded rod, support rod and support plate in the supporting and pressing assembly have a precise displacement relationship, and the pressure of the support plate on the inner wall of the shaping cylinder can be controlled to achieve precise pressure on the refractory metal powder. In coordination with the rotating movement of the shaping cylinder, the refractory metal powder is shaped while rotating in the interlayer, avoiding the phenomenon of local accumulation of refractory metal powder, improving the uniformity of the shaping of the refractory metal powder, and then improving the strength and precision of the pipe after the refractory metal powder forms the pipe.

[0018] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification, are used to explain the principles of the present disclosure. Obviously, the drawings described below are only some embodiments of the present disclosure, and those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0020] Figure 1 It is a schematic structural diagram of a device for preparing a refractory metal composite pipe in an exemplary embodiment of the present disclosure.

[0021] Figure 2 This is a schematic structural diagram of a stretching and pressing assembly of a device for preparing a refractory metal composite pipe in an exemplary embodiment of the present disclosure.

[0022] Figure 3 It is a cross-sectional view of a device for preparing a refractory metal composite pipe in an exemplary embodiment of the present disclosure.

[0023] Figure 4 The present invention is a flowchart of a method for preparing a refractory metal composite pipe in an exemplary embodiment of the present invention.

[0024] The description of the accompanying drawings is as follows: 100, base plate; 101, first fixed block; 102, second fixed block; 200, drive assembly; 210, drive member; 220, threaded rod; 300, shaping assembly; 310, shaping cylinder; 320, interlayer; 400, supporting and pressing assembly; 410, first rotating sleeve; 420, second rotating sleeve; 430, support rod; 431, slide groove; 440, support plate; 450, connecting rod; 500, blowing assembly; 510, piston cylinder; 520, cam; 530, piston head; 540, push rod; 600, electromagnet. DETAILED DESCRIPTION

[0025] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. Like reference numerals in the figures represent identical or similar structures, and thus their detailed descriptions will be omitted. Furthermore, the figures are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale.

[0026] Although relative terms such as "upper" and "lower" are used in this specification to describe the relationship of one illustrated component to another, these terms are used herein for convenience only, such as in accordance with the orientation of the illustrations in the accompanying drawings. It will be understood that if the illustrated device were flipped upside down, the component described as "upper" would become the component "lower." When a structure is referred to as "on" another structure, this may mean that the structure is integrally formed with the other structure, that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure via the other structure.

[0027] The terms "a", "an", "the", "said" and "at least one" are used to indicate the presence of one or more elements / components / etc.; the terms "including" and "having" are used to express open-ended inclusion and mean that additional elements / components / etc. may be present in addition to the listed elements / components / etc.; the terms "first", "second" and "third" etc. are used only as labels and are not intended to limit the quantity of their objects.

[0028] The present disclosure provides a device for preparing a refractory metal composite pipe. Figure 1 As shown, combined Figure 2 and Figure 3 The device includes: a base plate 100, a driving component 200, a shaping component 300 and a supporting and pressing component 400.

[0029] Among them, the first fixed block 101 and the second fixed block 102 are fixedly connected to the base plate 100; the driving assembly 200 includes a driving member 210 and a threaded rod 220, the driving member 210 is fixed on the first fixed block 101, and the output shaft of the driving member 210 passes through the second fixed block 102 and is connected to the threaded rod 220. The driving assembly 200 is used to provide driving power for the device, and the driving assembly 200 is fixed to the base plate 100 through the first fixed block 101, which can provide stable driving force for the device.

[0030] The shaping assembly 300 includes a shaping cylinder 310, in which an interlayer 320 is arranged. The shaping cylinder 310 is provided with an opening connected to the interlayer 320. The inner wall of the shaping cylinder 310 is made of elastic material. The interlayer 320 of the shaping cylinder 310 can carry refractory metal powder to adapt to the shape of the pipe.

[0031] The supporting and pressing assembly 400 includes a first rotating sleeve 410, a second rotating sleeve 420, a support rod 430, a support plate 440 and a connecting rod 450; wherein, the first rotating sleeve 410 is sleeved on one end of the threaded rod 220, and the second rotating sleeve 420 is sleeved on the other end of the threaded rod 220 and threadedly engaged with the threaded rod 220; multiple support rods 430 are circumferentially hinged on the second rotating sleeve 420, and the end of the support rod 430 away from the second rotating sleeve 420 is hinged to the support plate 440, and the shaping cylinder 310 is located on the movement path of the support plate 440, and when the support plate 440 abuts against the shaping cylinder 310, the support plate 440 can apply pressure to the shaping cylinder 310; the connecting rod 450 is circumferentially hinged on the first rotating sleeve 410, and a sliding groove 431 is provided on the support rod 430. The connecting rod 450 passes through the sliding groove 431 and slides with the support plate 440.

[0032] The preparation device of the refractory metal composite pipe provided by the present disclosure, when preparing the refractory metal composite pipe, the refractory metal powder is placed in the interlayer 320 of the shaping cylinder 310, and the refractory metal powder is shaped. After the refractory metal powder is shaped, the threaded rod 220 is driven to rotate by the driving component 200, and the second rotating sleeve 420 moves along the thread direction of the threaded rod 220, thereby driving the support rod 430 to push the support plate 440 to move toward the inner wall of the shaping cylinder 310, and the inner wall of the shaping cylinder 310 is pressed, so that the refractory metal powder located in the interlayer 320 of the shaping cylinder 310 is pressed and shaped. At the same time, the threaded rod 220 drives the first rotating sleeve 4 10 rotates, thereby causing the shaping cylinder 310 to rotate, and the refractory metal powder is further evenly distributed through the action of centrifugal force. The threaded rod 220, the support rod 430 and the support plate 440 in the supporting and pressing assembly 400 have a precise displacement relationship. By controlling the pressure of the support plate 440 on the inner wall of the shaping cylinder 310, the rotational movement of the shaping cylinder 310 is coordinated to achieve the effect of shaping the refractory metal powder while rotating in the interlayer 320, avoiding the phenomenon of local accumulation of the refractory metal powder, and achieving precise pressure on the refractory metal powder, thereby improving the uniformity of the shaping of the refractory metal powder, and then improving the strength and precision of the pipe after the refractory metal powder forms the pipe.

[0033] It should be noted that the refractory metal powder provided in the present disclosure can be one or more combinations of alloy powders such as molybdenum alloy, tungsten alloy, niobium alloy, etc.; or an alloy powder formed by doping the above alloy powder with second phase reinforcement particles, and the second phase reinforcement particles can be rare earth oxides or ceramic phases, etc., which are used to assist in improving the hardness and strength of the material.

[0034] The following will describe in detail the various parts of the device for preparing the refractory metal composite pipe provided by the embodiment of the present disclosure with reference to the accompanying drawings: In the embodiments provided in the present disclosure, Figure 1 As shown, combined Figure 2 and Figure 3 The device includes a base plate 100 and a driving assembly 200 connected to the base plate 100 , and a first fixing block 101 and a second fixing block 102 are fixedly connected to the base plate 100 .

[0035] The bottom of the first fixing block 101 and the bottom of the second fixing block 102 are fixed to the same surface of the base plate 100 at the same time, and the top of the second fixing block 102 is higher than the top of the first fixing block 101. The driving member 210 is fixed to the top of the first fixing block 101. The first fixing block 101 provides a fixed support force for the driving member 210. When the driving member 210 provides driving force for the device, it prevents the driving member 210 from vibrating or shaking, which may have an adverse effect on the output power.

[0036] A through hole is provided on the second fixed block 102, and there is no overlap between the orthographic projection of the through hole on the surface where the side surface of the first fixed block 101 is located and the side surface of the first fixed block 101. The output shaft of the driving member 210 is passed through the through hole, and the second fixed block 102 is used for supporting the output shaft of the driving member 210.

[0037] The drive assembly 200 further includes a threaded rod 220, which is connected to the output shaft of the drive assembly 200. The drive member 210 provides a rotational torque to the threaded rod 220 via the output shaft to drive the threaded rod 220 to rotate. The drive member 210 can be a device that provides power, such as a motor.

[0038] In the embodiment provided by the present disclosure, the device includes a shaping component 300 , and the shaping component 300 includes a shaping cylinder 310 . An interlayer 320 is provided in the shaping cylinder 310 , and the interlayer 320 can be used to support and shape refractory metal powder.

[0039] The outer wall of the sizing barrel 310 can be made of a hard material such as metal, while the interior of the sizing barrel 310 is made of an elastic material. For example, the inner wall of the sizing barrel 310 can be made of rubber, so that the inner wall of the sizing barrel 310 can elastically deform when subjected to external forces. To ensure symmetry and uniformity during subsequent tube formation, the inner and outer walls of the sizing barrel 310 are coaxial. When the sizing barrel 310 rotates, the eccentricity of the sizing barrel 310 will not cause localized accumulation of refractory metal powder within the interlayer 320.

[0040] In some embodiments, since the inner wall of the shaping cylinder 310 is made of elastic material, the pressure on the inner wall can be changed according to the diameter of the prepared tube, thereby changing the shaping shape of the refractory metal powder in the interlayer 320 to adapt to the diameter of the tube to be prepared.

[0041] In the embodiments provided in the present disclosure, Figure 2 As shown, combined Figure 1 and Figure 3 The device includes a support and pressure assembly 400. The support and pressure assembly 400 includes a first rotating sleeve 410, a second rotating sleeve 420, a support rod 430, a connecting rod 450 and a support plate 440.

[0042] The first rotating sleeve 410 is sleeved onto one end of the threaded rod 220 and is cooperatively connected to the threaded rod 220. Specifically, the first rotating sleeve 410 is fixedly sleeved within the through hole of the second fixed block 102. When the output shaft of the driving member 210 drives the threaded rod 220 to rotate, the first rotating sleeve 410 can rotate synchronously with the threaded rod 220. The first rotating sleeve 410 protects the output shaft of the driving member 210 and the threaded rod 220 from wear. In some embodiments, the inner wall of the first rotating sleeve 410 can have a threaded structure, and the threaded rod 220 and the first rotating sleeve 410 can be cooperatively connected through a threaded engagement, synchronously driving the first rotating sleeve 410 to rotate when the threaded rod 220 rotates. Of course, the first rotating sleeve 410 and the threaded rod 220 can also be connected using other connection methods such as bonding or riveting to ensure synchronous rotation between the two.

[0043] The second rotating sleeve 420 is sleeved on the threaded rod 220 and is threadedly connected to the threaded rod 220. The first rotating sleeve 410 and the second rotating sleeve 420 are located at both ends of the threaded rod 220. The inner wall of the second rotating sleeve 420 can be provided with a threaded structure, which is connected to the thread on the threaded rod 220 through the threaded structure. The second rotating sleeve 420 will move synchronously with the threaded rod 220.

[0044] A plurality of support rods 430 are hingedly connected to the circumference of the second rotating sleeve 420. The support rods 430 rotate relative to the axial direction of the second rotating sleeve 420 as the second rotating sleeve 420 moves, and the rotation fulcrum of the support rods 430 is the connection point between the support rods 430 and the second rotating sleeve 420.

[0045] A support plate 440 is connected to the other end of the support rod 430. As the position of the support rod 430 changes, the support plate 440 can be displaced, and the shaping cylinder 310 is located on the movement path of the support plate 440. When the support plate 440 abuts against the shaping cylinder 310, the support plate 440 can apply pressure to the inner wall of the shaping cylinder 310.

[0046] In some embodiments, when the second rotating sleeve 420 moves toward the direction close to the second fixed block 102, the support rod 430 rotates along the axis direction away from the second rotating sleeve 420 to increase the angle between the support rod 430 and the axis of the second rotating sleeve 420, thereby causing the support plate 440 to move toward the direction close to the inner wall of the forming cylinder 310 to pressurize the inner wall of the forming cylinder 310.

[0047] In some embodiments, when the second rotating sleeve 420 moves away from the second fixed block 102, the support rod 430 rotates along the axial direction close to the second rotating sleeve 420 to reduce the angle between the support rod 430 and the axis of the second rotating sleeve 420, thereby causing the support plate 440 to move away from the inner wall of the forming cylinder 310 to reduce the pressure applied to the inner wall of the forming cylinder 310, or eliminate the pressure applied to the forming cylinder 310.

[0048] Since the movement trajectories of the multiple support rods 430 hinged on the circumference of the second rotating sleeve 420 are the same or similar, that is, the movement fulcrums of the multiple support rods 430 enclose a circular structure, the multiple support rods 430 can drive the support plate 440 to move during the movement. However, since the support rods 430 can only provide a fulcrum for the support plate 440, in order to improve the stability of the movement of the support plate 440 and the uniformity of the pressure exerted by the support plate 440 on the inner wall of the shaping cylinder 310, a plurality of connecting rods 450 are hinged on the circumferential direction of the first rotating sleeve 410, and a sliding groove 431 is provided on the rod body of each support rod 430. The connecting rod 450 passes through the sliding groove 431. It also slides with the support plate 440. When the threaded rod 220 rotates and drives the first rotating sleeve 410 to rotate, the first rotating sleeve 410 drives the connecting rod 450 to rotate, thereby driving the shaping cylinder 310 to rotate synchronously. On the one hand, the connecting rod 450 can provide supporting force for the support plate 440 to ensure the uniformity of the force applied by the support plate 440 to the shaping cylinder 310. On the other hand, the connecting rod 450 can drive the shaping cylinder 310 to rotate synchronously, and through the action of centrifugal force, the refractory metal powder in the interlayer 320 of the shaping cylinder 310 is evenly distributed, forming a process of evenly distributing and pressurizing the refractory metal powder to further improve the uniformity of shaping of the refractory metal powder.

[0049] In the embodiments provided in the present disclosure, Figure 3 As shown, combined Figure 1 and Figure 2 The device also includes a blowing assembly 500, which includes a piston cylinder 510. The piston cylinder 510 is fixed to the base plate 100. The piston cylinder 510 is provided with an air inlet and an air outlet. The air outlet is connected to the opening of the shaping cylinder 310 through an air pipeline. The blowing assembly 500 is used to blow air into the interlayer 320 of the shaping cylinder 310 to further improve the uniformity of the refractory metal powder.

[0050] The blowing assembly 500 further includes a cam 520, a piston head 530, and a push rod 540. The cam 520 is fixed to the output shaft of the driving member 210, the piston head 530 is slidably fitted in the piston cylinder 510, and one end of the push rod 540 is hinged to the piston head 530, and the other end of the push rod 540 is hinged to the cam 520.

[0051] The piston cylinder 510 can be fixed on the base plate 100. In order to ensure that the gas input by the blowing component 500 to the shaping cylinder 310 flows unidirectionally, a one-way valve can be provided between the air inlet and the air outlet, so that the gas input by the blowing component 500 to the shaping cylinder 310 flows unidirectionally into the shaping cylinder 310, thereby avoiding air flow disturbance in the shaping cylinder 310 and adversely affecting the uniformity of the refractory metal powder.

[0052] When the output shaft of the driving member 210 drives the threaded rod 220 to rotate, the output shaft of the driving member 210 drives the cam 520 to move, and the cam 520 drives the push rod 540 to move, so that the push rod 540 pushes the piston head 530 to reciprocate in the piston cylinder 510, pushing the gas in the gas piston cylinder 510 into the gas pipeline, and then entering into the interlayer 320 of the shaping cylinder 310 through the opening, so as to assist in adjusting the uniformity of the refractory metal powder in the interlayer 320 through the action of airflow.

[0053] In the embodiment provided by the present disclosure, the device further includes a controller, which is fixedly connected to the base plate 100 and is used to control the operation of the driver 210. Specifically, the controller can be used to control the output power of the driver 210 to control the rotation speed of the output shaft, wherein the rotation speed of the output shaft needs to be determined based on factors such as the pressure of the support plate 440 on the inner wall of the shaping cylinder 310 and the centrifugal force of the shaping cylinder 310. For example, the rotation speed of the output shaft of the driver 210 can be 500RPM (revolutions per minute) to 5000RPM, which not only ensures that sufficient centrifugal force is provided to the shaping cylinder 310, but also avoids the problem of localized accumulation of refractory metal powder in the shaping cylinder 310 due to excessive rotation speed of the driver 210.

[0054] In the embodiments provided in the present disclosure, Figure 3 As shown, the device further includes an electromagnet 600, which is fixed to the first rotating sleeve 410 and magnetically connected to the threaded rod 220. When the electromagnet 600 is activated, the first rotating sleeve 410 is magnetically attracted to the threaded rod 220 by the electromagnet 600, thereby achieving rotation of the first rotating sleeve 410; when the electromagnet 600 is deactivated, the first rotating sleeve 410 is separated from the threaded rod 220.

[0055] In some embodiments, the controller controls the driving member 210 to start and controls the electromagnet 600 to close. At this time, the second rotating sleeve 420 will move left and right along the thread in the direction of the rod body of the threaded rod 220 to drive the support plate 440 to support and press the inner wall of the forming cylinder 310. At the same time, the connecting rod 450 is expanded under the drive of the support plate 440 to provide auxiliary support to the support plate 440.

[0056] During the process of the inner wall of the shaping cylinder 310 being shaped by the support plate 440, the controller controls the electromagnet 600 to start, and the electromagnet 600 is magnetically connected to the threaded rod 220. When the driving member 210 drives the threaded rod 220 to rotate, the electromagnet 600 also drives the first rotating sleeve 410 to rotate, thereby driving the shaping cylinder 310 to rotate synchronously with the first rotating sleeve 410 through the connecting rod 450.

[0057] The present disclosure provides a method for preparing a refractory metal composite pipe, using the preparation device provided in any of the above embodiments, such as Figure 4 As shown, the method includes: steps S1 to S5.

[0058] Wherein, step S1: preparing refractory metal powder according to the number of layers of the required composite pipe and the metal composition of each layer, and pre-treating the refractory metal powder; Step S2: Refractory metal powder is put into the shaping cylinder, and the driving member drives the threaded rod to rotate, driving the second rotating sleeve to move axially, so that the support plate supports and presses the powder to shape it, while the connecting rod slides along the slide groove to adjust the support angle; Step S3: placing the pressed tube into a sintering furnace and pre-sintering it at a preset temperature, a preset gas environment, and a preset holding time; Step S4: placing the pre-sintered tube in a hot isostatic pressing furnace for densification treatment; Step S5: machining the densified pipe.

[0059] The preparation method provided by the present disclosure performs preliminary shaping of refractory metal powder in a shaping cylinder to improve the uniformity of the refractory metal powder, and achieves densification of the tube blank by combining pre-sintering and hot isostatic pressing sintering of the formed refractory metal powder. Combined with the uniformity of the formed refractory metal powder, the sintered tube blank has better density and higher strength, thereby improving the mechanical properties of the tube.

[0060] The following will be combined Figures 1 to 3 The steps of the method for preparing the refractory metal composite pipe provided in the embodiment of the present disclosure are described in detail: In the embodiment provided in the present disclosure, in step S1, refractory metal powder is prepared according to the number of layers of the required composite pipe and the metal composition of each layer, and the refractory metal powder is pretreated.

[0061] The desired number of layers of the composite tubing can be one or more. When the composite tubing has multiple layers, each layer of the composite tubing can be made of refractory metal powders of the same composition or refractory metal powders of different compositions. For example, when the composite tubing has two layers, the refractory metal powders corresponding to the two layers of the composite tubing can be sequentially added into the shaping drum 310. After one layer of refractory metal powder is shaped, another layer of refractory metal powder is added to shape the next layer of refractory metal powder, thereby achieving a layered pressing process for the multi-layer composite tubing.

[0062] The metal components in the refractory metal powder may include one or more of tungsten, molybdenum, tantalum, niobium, rhenium, etc., or alloys or derivatives of the above refractory metals. The specific metal components can be selected according to the actual design requirements of the pipe.

[0063] Among them, the pretreatment of the refractory metal powder includes: screening, drying and / or mixing the refractory metal powder. Specifically, screening the refractory metal powder can remove impurities and oversized particles in the powder according to the particle size, thereby achieving preliminary screening of the powder and avoiding the adverse effects of impurities or oversized particles on the uniformity of the powder. The refractory metal powder is dried to control the moisture content in the powder to improve the process adaptability and improve the subsequent sintering quality. The mixing treatment of the powder includes mixing the powder and uniformizing the various components in the powder to avoid the adverse effects of large-area or large-volume aggregation of one or some components in the powder on the uniformity of the powder.

[0064] In the embodiment provided in the present disclosure, in step S2, refractory metal powder is put into the shaping cylinder 310, and the threaded rod 220 is driven to rotate by the driving member 210, driving the second rotating sleeve 420 to move axially, so that the support plate 440 supports and presses the powder to shape it, and at the same time, the connecting rod 450 slides along the slide groove 431 to adjust the support angle.

[0065] In this step, the shaping assembly 300 , the driving assembly 200 , and the supporting and pressing assembly 400 perform preliminary shaping on the refractory metal powder to improve the uniformity of the shaping of the refractory metal powder.

[0066] In some embodiments, the above-mentioned preparation device includes an electromagnet 600 fixed on the first rotating sleeve 410 to shape the refractory metal powder, and also includes: through the magnetic force of the electromagnet 600 and the threaded rod 220, the first rotating sleeve 410 is driven to drive the shaping cylinder 310 to rotate, so that the refractory metal powder is evenly distributed in the shaping cylinder 310.

[0067] In some embodiments, the preparation device further includes a blowing assembly 500 to shape the refractory metal powder, and further includes: delivering gas into the interlayer 320 through the blowing assembly 500 to assist in adjusting the distribution uniformity of the refractory metal powder.

[0068] The specific process of shaping the refractory metal powder by the various components in the preparation device in the above embodiment is as shown in the embodiment of the above preparation device, and will not be repeated here.

[0069] The refractory metal powder is initially shaped by the shaping cylinder 310 and the supporting and pressing assembly 400. During the shaping process, the rotation of the shaping cylinder 310 combined with the supporting and pressing of the support plate 440 can improve the uniformity of the refractory metal powder, providing a uniform structural basis for the subsequent sintering of the shaped refractory metal powder.

[0070] In the embodiment provided in the present disclosure, in step S3, the pressed tube is placed in a sintering furnace and pre-sintered at a preset temperature, a preset gas environment and a preset holding time.

[0071] The preset temperature may be 800°C to 1500°C, for example, 800°C, 900°C, 1000°C, 1100°C, 1200°C, 1300°C, 1400°C, or 1500°C; the preset holding time may be 3 hours to 8 hours, for example, 3 hours, 4 hours, 5 hours, 6 hours, 7 hours, or 8 hours; and the preset gas may be a dry hydrogen atmosphere, a hydrogen-nitrogen mixed gas atmosphere, or the like. For refractory metal powders of different compositions, the preset temperature, preset gas, and preset holding time of the pre-sintering process may be adaptively adjusted to control and adjust the chemical reactions and physical changes of the refractory metal powders during the pre-sintering process to meet preset preparation requirements.

[0072] In some specific embodiments, the preset temperature is 1100° C., the preset holding time is 5 hours, and the preset gas is a dry hydrogen atmosphere.

[0073] In the embodiment provided in the present disclosure, in step S4, the pre-sintered tube is placed in a hot isostatic pressing furnace for densification treatment.

[0074] Among them, the temperature of the densification treatment can be 1800℃-2200℃, for example, it can be 1800℃, 1900℃, 2000℃, 2100℃, 2200℃, etc.; the pressure of the densification treatment can be 100Mpa-300Mpa, for example, it can be 100Mpa, 150Mpa, 200Mpa, 250Mpa, 300Mpa, etc. The temperature and pressure of the densification treatment need to be selected and adaptively adjusted according to parameters such as the material of the pipe, the number of layers, and the thickness of each layer.

[0075] Among them, a hot isostatic pressing furnace (HIP) is a device that uses high-temperature and high-pressure gas to uniformly pressurize pipes in multiple directions at the same time. It can process pipes under high-temperature and high-pressure conditions to achieve the purpose of densification, elimination of internal defects and improvement of material properties. The present disclosure does not limit the specific model and structure of the hot isostatic pressing furnace used for pipe densification treatment. Any hot isostatic pressing furnace that meets the requirements for pipe densification treatment is suitable for the preparation method provided by the present disclosure.

[0076] In the embodiment provided in the present disclosure, in step S5, the densified tube is subjected to mechanical processing.

[0077] In some embodiments, the machining includes turning, grinding and polishing the densified tube. The machining process can remove the rough parts on the surface of the tube, improve the surface finish and dimensional accuracy of the tube, and meet the specific requirements of different application scenarios for the appearance and performance of the tube. Specifically, turning can remove burrs and uneven parts on the surface of the tube, grinding can improve the surface finish of the tube, and polishing can make the tube achieve the required surface gloss and roughness to meet the performance requirements of the tube. Of course, the machining of the tube can also include other machining processes in addition to turning, grinding and polishing. Other machining processes can be selected according to factors such as the specific type of tube and the application scenario, such as electrospark machining, laser cutting, etc., to adapt to the application scenario and required mechanical properties of the tube.

[0078] The preparation method provided by the present disclosure pre-treats refractory metal powder to preliminarily provide uniform powder for subsequent preparation of pipes.

[0079] The refractory metal powder is initially shaped in the shaping cylinder 310 to improve the uniformity of the refractory metal powder, and then the refractory metal powder is formed; the refractory metal powder is pressed and formed by the shaping cylinder 310 to further improve the uniformity of the refractory metal powder in the shaping process, forming a tube blank with a uniform tube body, so as to improve the strength and performance of the subsequent tube preparation after forming; the tube blank after initial shaping is pre-sintered and hot isostatic pressing sintered in a combination manner to achieve densification of the tube blank, combined with the uniformity of the refractory metal powder after forming, so that the sintered tube blank has better density and higher strength, thereby improving the mechanical properties of the tube.

[0080] The following describes a preparation device and method for refractory metal composite pipes using specific examples: Example 1 Step 1: Prepare tungsten-copper alloy and doped rare earth (lanthanum oxide) powder, sieve and dry the tungsten-copper alloy and doped rare earth (lanthanum oxide) powder respectively, and mix the tungsten-copper alloy and doped rare earth (lanthanum oxide) powder to form refractory metal powder; wherein, the sieving process can first use a 100-mesh coarse sieve combined with a 325-mesh fine sieve to remove impurities and oversized particles in the powder; then place the powder in a vacuum oven for drying for 6 hours; and mix the sieved and dried powders; Step 2: Place refractory metal powder in the interlayer 320 of the shaping cylinder 310 . The inner wall of the shaping cylinder 310 is made of rubber, and the outer wall is made of metal.

[0081] By starting the double-headed motor in the device, the output shaft of the double-headed motor rotates at a speed of 2000RPM. At this time, the electromagnet 600 in the device is closed, and the output shaft of the double-headed motor drives the second rotating sleeve 420 to move along the rod direction of the threaded rod 220. The second rotating sleeve 420 drives the support rod 430 to expand, and the support rod 430 drives the support plate 440 to apply pressure to the inner wall of the shaping cylinder 310 to support and press the powder in the interlayer 320; in the process of the support plate 440 applying pressure to the inner wall, the electromagnet 600 is started, and the output shaft of the double-headed motor drives the first rotating sleeve 410 to rotate, so that the first rotating sleeve 410 drives the shaping cylinder 310 to rotate synchronously, so that the support plate 440 applies pressure to the inner wall of the shaping cylinder 310 along the circumferential direction of the shaping cylinder 310. The rotation of the shaping cylinder 310 and the pressure of the support plate 440 can homogenize and shape the refractory metal powder to form a single-layer tube blank. Continue to add refractory metal powder into the interlayer 320 of the forming cylinder 310 so that the refractory metal powder is located between the single-layer tube blank and the inner wall of the forming cylinder 310, and repeat the above forming process to form a double-layer tube blank.

[0082] Step 3: Place the double-layer tube blank formed in step 2 in a sintering furnace for pre-sintering, wherein the pre-sintering conditions are to first raise the temperature to 800°C and keep it for 4 hours in a wet hydrogen atmosphere with a dew point of 60°C, and then change to a dry hydrogen atmosphere and raise the temperature to 1000°C and keep it for 4 hours to obtain a sintered double-layer tube blank.

[0083] Step 4: Place the sintered double-layer tube blank in step 3 in a hot isostatic pressing furnace for densification treatment, wherein the hot isostatic pressing furnace sintering temperature is 2000°C; the pressure is 150 MPa, and the heat and pressure holding time is 2 hours to obtain a double-layer sintered blank.

[0084] Step 5: The double-layer sintered blank is turned, ground and polished to obtain a composite tube.

[0085] The density of the composite pipe can reach more than 99%, the structure is uniform and dense, the tensile strength can reach 1120Mpa, the bending strength can reach 1220Mpa, and the mechanical properties are excellent.

[0086] Example 2 Step 1: Prepare tungsten-nickel-iron alloy and doped rare earth (lanthanum oxide) powder, sieve and dry the tungsten-nickel-iron alloy and doped rare earth (lanthanum oxide) powder respectively, and mix the tungsten-nickel-iron alloy and doped rare earth (lanthanum oxide) powder to form refractory metal powder; wherein, the sieving process can first use a 100 mesh coarse sieve combined with a 325 mesh fine sieve to remove impurities and oversized particles in the powder; then place the powder in a vacuum oven for drying for 6 hours; and mix the sieved and dried powders; Step 2: Place refractory metal powder in the interlayer 320 of the shaping cylinder 310 . The inner wall of the shaping cylinder 310 is made of rubber, and the outer wall is made of metal.

[0087] By starting the double-headed motor in the device, the output shaft of the double-headed motor rotates at a speed of 3000RPM. At this time, the electromagnet 600 in the device is closed, and the output shaft of the double-headed motor drives the second rotating sleeve 420 to move along the rod direction of the threaded rod 220. The second rotating sleeve 420 drives the support rod 430 to expand, and the support rod 430 drives the support plate 440 to apply pressure to the inner wall of the shaping cylinder 310 to support and press the powder in the interlayer 320; in the process of the support plate 440 applying pressure to the inner wall, the electromagnet 600 is started, and the output shaft of the double-headed motor drives the first rotating sleeve 410 to rotate, so that the first rotating sleeve 410 drives the shaping cylinder 310 to rotate synchronously, so that the support plate 440 applies pressure to the inner wall of the shaping cylinder 310 along the circumferential direction of the shaping cylinder 310. The rotation of the shaping cylinder 310 and the pressure of the support plate 440 can homogenize and shape the refractory metal powder to form a single-layer tube blank. Continue to add refractory metal powder into the interlayer 320 of the forming cylinder 310 so that the refractory metal powder is located between the single-layer tube blank and the inner wall of the forming cylinder 310, and repeat the above forming process to form a double-layer tube blank.

[0088] Step 3: Place the double-layer tube blank formed in step 2 in a sintering furnace for pre-sintering, wherein the pre-sintering conditions are to first heat to 800°C and keep warm for 2 hours, then heat to 1000°C and keep warm for 3 hours in a H2-N2 mixed atmosphere to obtain a sintered double-layer tube blank.

[0089] Step 4: Place the sintered double-layer tube blank in step 3 in a hot isostatic pressing furnace for densification treatment, wherein the hot isostatic pressing furnace sintering temperature is 2200°C; the pressure is 200 MPa, and the heat and pressure holding time is 2 hours to obtain a double-layer sintered blank.

[0090] Step 5: The double-layer sintered blank is turned, ground and polished to obtain a composite tube.

[0091] The density of the composite pipe can reach more than 99%, the structure is uniform and dense, the tensile strength can reach 1200Mpa, the bending strength can reach 1300Mpa, and the mechanical properties are excellent.

[0092] It should be noted that although the steps of the method for preparing a refractory metal composite pipe disclosed herein are depicted in a specific order in the accompanying drawings, this does not require or imply that the steps must be performed in this specific order, or that all steps shown must be performed to achieve the desired result. Additionally or alternatively, certain steps may be omitted, multiple steps may be combined into one step, and / or a single step may be broken down into multiple steps.

[0093] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the present disclosure being indicated by the appended claims.

Claims

1. A device for preparing refractory metal composite pipes, characterized in that: include: A bottom plate, to which a first fixing block and a second fixing block are fixedly connected; A driving assembly comprising a driving member and a threaded rod, wherein the driving member is fixed to the first fixing block, and an output shaft of the driving member passes through the second fixing block and is connected to the threaded rod; A shaping assembly comprises a shaping cylinder, wherein an interlayer is provided in the shaping cylinder, an opening communicating with the interlayer is provided on the shaping cylinder, and an inner wall of the shaping cylinder is made of an elastic material; The support and pressure assembly includes a first rotating sleeve, a second rotating sleeve, a support rod, a support plate, and a connecting rod; wherein the first rotating sleeve is sleeved on one end of the threaded rod, and the second rotating sleeve is sleeved on the other end of the threaded rod and threadably engaged with the threaded rod; a plurality of the support rods are circumferentially hinged to the second rotating sleeve, and one end of the support rod away from the second rotating sleeve is hinged to the support plate, the shaping cylinder is located on the movement path of the support plate, and when the support plate abuts against the shaping cylinder, the support plate can apply pressure to the shaping cylinder; The connecting rod is circumferentially hinged to the first rotating sleeve, and a sliding groove is provided on the support rod. The connecting rod passes through the sliding groove and is slidably matched with the support plate.

2. The device for preparing refractory metal composite pipe according to claim 1, characterized in that: It also includes a blowing assembly, which includes a piston cylinder. The piston cylinder is fixed to the base plate and is provided with an air inlet and an air outlet. The air outlet is connected to the opening of the shaping cylinder through an air pipeline.

3. The device for preparing refractory metal composite pipe according to claim 2, characterized in that: The blowing assembly also includes: A cam fixed to the output shaft of the driving member; a piston head, the piston head being slidably fitted in the piston cylinder; A push rod, one end of which is hinged to the piston head, and the other end of which is hinged to the cam.

4. The device for preparing refractory metal composite pipe according to claim 1, characterized in that: Also includes: The controller is fixedly connected to the base plate and is used to control the operation of the driving member.

5. The device for preparing refractory metal composite pipe according to claim 1, characterized in that: Also includes: The electromagnet is fixed on the inner wall of the first rotating sleeve and is magnetically connected to the threaded rod.

6. A method for preparing a refractory metal composite pipe, using the preparation device according to any one of claims 1 to 5, characterized in that: include: Step S1, preparing refractory metal powder according to the number of layers of the required composite pipe and the metal composition of each layer, and pre-treating the refractory metal powder; Step S2: putting the refractory metal powder into the shaping cylinder, and driving the threaded rod to rotate by the driving member, thereby driving the second rotating sleeve to move axially, so that the support plate supports and presses the powder to shape it, and the connecting rod slides along the slide groove to adjust the support angle; Step S3, placing the pressed tube in a sintering furnace and pre-sintering it at a preset temperature, a preset gas environment, and a preset holding time; Step S4, placing the pre-sintered tube in a hot isostatic pressing furnace for densification treatment; Step S5: machining the densified pipe.

7. The method for preparing a refractory metal composite pipe according to claim 6, wherein: The preparation device further includes an electromagnet fixed on the first rotating sleeve, and in step S2, further includes: The first rotating sleeve is driven to rotate the shaping cylinder by the magnetic force cooperation between the electromagnet and the threaded rod, so that the refractory metal powder is evenly distributed in the shaping cylinder.

8. The method for preparing a refractory metal composite pipe according to claim 6 or 7, characterized in that: The preparation device further includes a blowing component, and in step S2, further includes: The gas is delivered into the interlayer through the air blowing assembly to assist in adjusting the distribution uniformity of the refractory metal powder.

9. The method for preparing a refractory metal composite pipe according to claim 6, wherein: In step S4, the temperature of the densification treatment is 1800°C-2200°C.

10. The method for preparing a refractory metal composite pipe according to claim 6, wherein: In step S1 , the refractory metal powder is pretreated, including: screening, drying and / or mixing the refractory metal powder.

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