A flash sintering device for large current and large pressure

Abstract

The application is suitable for the field of advanced manufacturing of powder materials, and provides a flash sintering equipment for large current and large pressure, which comprises a power supply module, a pressure generation module, a support frame, a high vacuum module, a jacking module, a sintering unit and a conveying module. The sintering unit is provided with a sintering platform, a floating mold module and a floating lower punch module, and is guided by upper and lower guide columns; the jacking module jacks up the lower electrode through a lead screw, pushes the floating lower punch module and the floating mold module to move upwards along the guide column to separate from the platform, and realizes floating butt joint; the pressure generation module drives the upper punch to press downwards through the upper electrode and applies pressure to the sample, and the power supply module simultaneously applies sintering current. Through the design of the floating mold module connected in a non-rigid manner, the application avoids the transmission of the pressing force to the sintering platform, prevents the equipment from overturning, and improves the stability of the sintering process; and the combination of the conveying module realizes the overall station switching of the sintering unit, and improves the continuous automatic production capacity of the equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of advanced manufacturing of powder materials, and particularly to a flash sintering equipment for large current and large pressure. BACKGROUND

[0002] As a new emerging electric field assisted sintering technology, flash sintering technology has shown great potential in the laboratory research of new ceramic and metal materials due to its outstanding advantages of extremely low sintering temperature, extremely fast sintering speed (second level), and effective inhibition of grain growth. However, traditional flash sintering research is usually carried out under the condition of no or only a small pressure (<1 MPa), which leads to the difficulty in completely eliminating internal pores during the rapid densification process of the green body, especially for large-size or complex-shaped parts, which is prone to sintering defects and insufficient strength, restricting its application in the field of high-performance dense parts. The introduction of large pressure (tens of MPa to hundreds of MPa) into the flash sintering process forms a "field-force-heat" multi-coordinated effect, which is expected to further improve the density, strength and reliability of the product while retaining the advantages of low temperature, fast and fine grain of flash sintering, and is the key path to promote the technology from the laboratory to the industrialization.

[0003] However, the industrialization of this technology route faces fundamental challenges. The core contradiction is that the traditional flash sintering equipment cannot provide the large pressure environment and automatic process required for continuous production, while the existing automatic pressure sintering technology (such as SPS) has a pressure system, but its equipment structure and continuous solution cannot meet the dynamic sealing, pressure isolation and multi-station coordination required for flash sintering continuous production.

[0004] In order to break through the above limitations, a number of patent technologies have emerged in recent years. According to the search, Chinese patent CN118391921A discloses a continuous SPS feeding system and its feeding method, which includes a base, a sintering assembly installed on the top of the base, a feeding assembly arranged in front of the sintering assembly, a conveying assembly connected to one side of the sintering assembly, and a shunt assembly installed inside the conveying assembly. The device solves the problem that different sintered product molds have different cooling times due to size, shape and surface condition when the material powder is sintered into sintered body particles, and then the temperature of the sintered product mold is not within the discharge temperature range when the sintered product mold is discharged, affecting the cooling effect. The device uses a linear conveying mechanism and two sets of shunt conveying mechanisms to separate the sintered product molds with higher or lower temperatures from the sintered product molds within the normal temperature range for separate conveying, avoiding the direct discharge of the sintered product mold that does not meet the discharge temperature standard during the continuous feeding process in the sintering area, which affects the cooling effect of the product.

[0005] However, the application does not solve the problem of pressure conduction, and the sintering assembly still relies on a fixed base, and the axial pressing force (usually > 40 MPa) is directly transmitted to the fixed platform, causing pressure impact accumulation and unable to realize modular transfer; it also does not solve the problem of powder leakage caused by vibration during mold transfer. In addition, the mold and punch are not integrated, which causes the punch to fall off during the transfer of large-size green bodies (> 100 mm), causing the green body to collapse.

[0006] Therefore, in view of the above status quo, it is urgent to provide an equipment capable of cooperatively managing large pressure and large current, and realizing continuous automatic flash sintering of powder materials, to overcome the core bottleneck that the existing technical solutions cannot adapt to the new process requirements. SUMMARY

[0007] The purpose of the present application is to provide a flash sintering equipment for large current and large pressure, aiming to overcome the shortcomings of the existing conventional flash sintering equipment, such as inability to apply large pressure and insufficient automation; overcome the shortcomings of the existing SPS sintering device, such as accumulation of axial pressing force transmission causing platform overturning, dynamic sealing not strict during mold transfer causing powder leakage, punch falling off during transfer of large-size green bodies (> 100 mm) causing green body collapse, etc.

[0008] The present application is realized as follows: a flash sintering equipment for large current and large pressure, comprising:

[0009] A power supply module, a pressure generation module, a support frame, a high vacuum module, and a sintering unit for accommodating sintering sample raw materials, further comprising:

[0010] A jacking module and a conveying module;

[0011] The sintering unit comprises a fixed sintering platform, a floating mold module and a floating lower punch module slidably arranged on the sintering platform through a guide mechanism;

[0012] The jacking module is arranged below the sintering platform, and its output end acts on the floating lower punch module, for driving the floating lower punch module together with the floating mold module to rise along the guide mechanism, so that the floating mold module and the floating lower punch module as a whole are separated from the sintering platform and form a floating docking state;

[0013] The pressure generation module is arranged above the sintering platform, and its output end acts on the upper punch located in the floating mold module, for applying pressure to the sintering sample raw materials;

[0014] The power supply module is used to provide sintering current to the upper punch and the floating lower punch module;

[0015] The conveying module is connected with the sintering platform and is used for driving the sintering unit to move between different stations.

[0016] As a further scheme of the present application, the guide mechanism comprises an upper guide column and a lower guide column fixedly installed on the sintering platform.

[0017] The floating die module is in sliding fit with the upper guide column, and the floating lower punch module is in sliding fit with the lower guide column.

[0018] As a further scheme of the present application, the floating die module comprises a die, and a floating die holder is arranged outside the die.

[0019] As a further scheme of the present application, a first sliding sleeve is arranged between the floating die holder and the upper guide column, and the first sliding sleeve is in clearance fit with the upper guide column and is in interference fit with the floating die holder.

[0020] As a further scheme of the present application, the floating lower punch module comprises a first T-shaped lower punch, a first punch shaft surface of the first T-shaped lower punch is always in sliding contact with an inner surface of the die, and a first punch upper end surface of the first T-shaped lower punch is periodically in contact with a lower end surface of the die.

[0021] As a further scheme of the present application, the first T-shaped lower punch is fixedly connected with a second T-shaped lower punch, and an insulating gasket and a floating lower punch holder are sequentially connected to the second T-shaped lower punch.

[0022] As a further scheme of the present application, a second sliding sleeve is arranged between the floating lower punch holder and the lower guide column, and the second sliding sleeve is in clearance fit with the lower guide column and is in interference fit with the floating lower punch holder.

[0023] As a further scheme of the present application, the high-vacuum module comprises a high-vacuum box, high-vacuum plug valves for isolating stations are arranged on both sides of the high-vacuum box, and a sliding sealing piece is arranged between the high-vacuum box and output ends of the pressure generating module and the jacking module.

[0024] As a further scheme of the present application, the conveying module comprises guide rails, a self-driven sliding block and a driven sliding block which can move on the guide rails, the sintering platform is connected with the self-driven sliding block through a first fixed plate and is connected with the driven sliding block through a second fixed plate.

[0025] As a further scheme of the present application, the upper punch is fixedly connected with an upper electrode of the power supply module.

[0026] Compared with the prior art, the present application has the following beneficial effects:

[0027] (1) Through the non-rigid connection module (floating mold module + floating lower punch module), the sintering unit is separated from the base along the guide column, the conduction of the pressing force to the platform body is completely blocked, and the risk of overturning of the sintering platform is avoided, so that the stability in the sintering pressing process is ensured;

[0028] (2) Through the T-shaped punch shaft surface constant contact design (dynamic sliding sealing between the first punch shaft surface and the inner surface of the mold), the problems of powder leakage and green body support are solved at the same time;

[0029] (3) The sintering platform is connected with the conveying module through the first fixed plate and the second fixed plate, the overall station switching of the sintering unit is realized, the coordinated disorder caused by single-point floating is avoided, compared with the traditional SPS feeding system, the mechanical hand intervention link is reduced, and the theoretical productivity is significantly improved. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the specific embodiments or prior art of the present application, the drawings needed in the description of the specific embodiments or prior art will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0031] Figure 1 It is a schematic diagram of the inclined side surface of the overall structure of the present application;

[0032] Figure 2 It is an exploded view of the front surface of the overall structure of the present application (except the high vacuum module);

[0033] Figure 3 It is a schematic diagram of the overall structure of the sintering unit of the present application;

[0034] Figure 4 It is a schematic diagram of the overall structure of the sintering unit of the present application;

[0035] Figure 5 It is an exploded view of the sintering unit structure of the present application;

[0036] Figure 6 It is a schematic diagram of the sintering platform structure of the present application;

[0037] Figure 7 It is a schematic diagram of the floating mold module structure of the present application;

[0038] Figure 8 It is a schematic diagram of the floating lower punch module structure of the present application;

[0039] Figure 9 It is a partial structure sectional view of the sintering process of the present application.

[0040] In the figure: 1 - power module, 11 - current generating device, 12 - conductive strip, 13 - upper electrode, 14 - upper punch, 15 - lower electrode, 2 - pressure generating module, 21 - hydraulic cylinder, 22 - piston rod, 3 - support frame, 4 - high vacuum module, 41 - high vacuum box, 42 - high vacuum plug valve, 43 - sliding seal, 5 - jacking module, 51 - screw rod elevator, 52 - screw rod, 6 - sintering unit, 61 - sintering platform, 611 - first fixed plate, 612 - second fixed plate, 62 - floating mold module, 621 - mold, 622 - floating mold holder, 623 - first sliding sleeve, 63 - floating lower punch module, 631 - first T-shaped lower punch, 6311 - first punch shaft surface, 6312 - first punch upper end surface, 632 - second T-shaped lower punch, 633 - floating lower punch holder, 634 - insulating gasket, 635 - second sliding sleeve, 64 - upper guide column, 65 - lower guide column, 7 - conveying module, 71 - guide rail fixed block, 72 - guide rail, 73 - self-driven sliding block, 74 - driven sliding block, 8 - sintering sample raw material. DETAILED DESCRIPTION

[0041] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0042] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0043] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application should be understood according to the specific circumstances.

[0044] The present application will be further explained and described below in conjunction with specific embodiments.

[0045] Referring to Figures 1-9 The embodiment of the present application provides a flash sintering equipment for large current and large pressure, which comprises a power supply module 1, a pressure generation module 2, a support frame 3, a high-vacuum module 4, a jacking module 5, a sintering unit 6 for containing sintering sample raw materials 8 and a conveying module 7. The sintering unit 6 comprises a sintering platform 61, a floating mold module 62 and a floating lower punch module 63, and the sintering platform is fixedly installed with an upper guide column 64 and a lower guide column 65. The jacking module 5 comprises a screw rod elevator 51 and a screw rod 52, the screw rod elevator 51 outputs lifting power to the screw rod 52, the screw rod 52 pushes the floating lower punch module 63 to slide upward along the lower guide column 65 by lifting the lower electrode 15 arranged in the power supply module 1, and the floating lower punch module 63 contacts and pushes the floating mold module 62 and the sintering sample raw materials 8 to slide upward along the upper guide column 64. The pressure generation module 2 outputs downward moving force to a piston rod 22 through a hydraulic cylinder 21 arranged therein, the piston rod 22 pushes the upper punch 14 to output pressure on the upper surface of the sintering sample raw materials 8 by pushing the upper electrode 13 arranged in the power supply module 1, the power supply module 1 outputs current generated by a current generation device 11 to the upper and lower surfaces of the sintering sample raw materials 8 through a conductive belt 12, the upper electrode 13 and the lower electrode 15, and the conveying module 7 realizes overall station switching of the sintering unit 6.

[0046] In this embodiment, the floating mold module 62 and the floating lower punch module 63 are not rigidly connected to the sintering platform 61. During the sintering process, the screw jack 51 of the lifting module 5 first receives power from the motor to push the screw 52 upward. Since the lower electrode 15 of the power supply module 1 is fixedly connected to the screw 52 through an insulating gasket, the lower electrode 15 moves upward through the high vacuum chamber 41 until it contacts the lower end of the floating lower punch module 63. At this time, the lower electrode 15 continues to move upward, pushing the floating lower punch module 63 to slide upward along the lower guide post 65 for a certain distance. The floating lower punch module 63 simultaneously pushes the floating mold module 62 and the sintering sample material 8 in contact with it to slide upward along the upper guide post 64 for a certain distance, thus realizing the floating setting of the floating lower punch module 63 and the floating mold module 62. Next, the hydraulic cylinder 21 of the pressure generating module 2 pushes the piston rod 22 downward, and the piston rod 22 pushes the upper punch 14, which is fixedly connected to the piston rod 22 via the upper electrode 13, downward until the upper punch 14 contacts the upper surface of the sintering sample material 8. The hydraulic cylinder 21 outputs pressure to the sintering sample material 8 through the piston rod 22, the upper electrode 13, and the upper punch 14. At this time, the power supply module 1 outputs the current generated by the current generating device 11 to the upper and lower surfaces of the sintering sample material 8 through the conductive strip 12, the upper electrode 13, and the lower electrode 15, completing the sintering of the sample. After sintering, all components return to their original positions. At this time, the conveying module 7 moves the sintering unit 6 out of the sintering station to realize the overall station switching. The floating design of the floating mold module 62 and the floating lower punch module 63, which are detached from the sintering platform 61, avoids the problem of the upper and lower presses transmitting axial pressing force to the sintering platform 61 during the sintering pressing process, thereby avoiding the risk of the sintering platform 61 overturning and ensuring the stability of the sintering pressing process.

[0047] Reference Figure 1 , Figure 2 as well as Figures 4-9 The floating mold module 62 includes a mold 621, and a floating mold retainer 622 is provided on the outside of the mold 621 by means of screw fastening. A first sliding sleeve 623 is provided between the floating mold retainer 622 and the upper guide post 64. The first sliding sleeve 623 is clearance-fitted with the upper guide post 64 and interference-fitted with the floating mold retainer 622.

[0048] The floating lower punch module 63 includes a first T-shaped lower punch 631. The first punch shaft surface 6311 of the first T-shaped lower punch 631 is always in sliding contact with the inner surface of the mold 621, and the upper upper surface 6312 of the first punch is in periodic contact with the lower end surface of the mold 621. A second T-shaped lower punch 632 is also fixedly connected to the first T-shaped lower punch 631. The second T-shaped lower punch 632 is fixedly connected to the floating lower punch holder 633 through an insulating gasket 634. A second sliding sleeve 635 is provided between the floating lower punch holder 633 and the lower guide post 65. The second sliding sleeve 635 is clearance-fitted with the lower guide post 65 and interference-fitted with the floating lower punch holder 633.

[0049] In this embodiment, the mold 621 and the floating mold holder 622 are fixedly connected by screws and lubricated by the first sliding sleeve 623 to achieve low-resistance sliding along the upper guide post 64. Similarly, the floating lower punch holder 633 is lubricated by the second sliding sleeve 635 to drive the second T-shaped lower punch 632 and the first T-shaped lower punch 631 to achieve low-resistance sliding along the lower guide post 65. At the start of sintering, the lower end face of the second T-shaped lower punch 632 receives the power transmitted by the lifting module 5, which drives the first T-shaped lower punch 631 to move upward along the lower guide post 65 under the restraint of the floating lower punch holder 633. When the upper end face 6312 of the first punch contacts the lower end face of the mold 621, the first T-shaped lower punch 631 drives the entire floating mold holder 622, which is fixedly connected to the mold 621, to move upward along the upper guide post 64, thereby causing the floating mold module 62 and the floating lower punch module 63 to detach from the surface of the sintering platform 61. The design of the second T-shaped lower punch 632 eliminates the need to replace the entire floating lower punch module 63 when the first T-shaped lower punch 631 is damaged. During the up-and-down movement of the first T-shaped lower punch 631, its first punch shaft surface 6311 remains in sliding contact with the inner surface of the mold 621, preventing powder leakage due to vibration. Furthermore, during the sintering of large-diameter green blanks, the supporting role provided by the sliding connection between the first T-shaped lower punch 631 and the sintering platform 61 prevents the collapse of large-diameter green blanks during transportation.

[0050] Reference Figure 1 , Figure 2 and Figure 3 The high vacuum module 4 includes a high vacuum chamber 41. High vacuum gate valves 42 are fixedly installed on both sides of the high vacuum chamber 41 to isolate high vacuum modules from other workstations. A sliding seal 43 is provided between the high vacuum chamber 41 and the upper electrode 13 and the lower electrode 15.

[0051] The conveying module 7 includes a guide rail 72, a self-driven slider 73, and a driven slider 74. The guide rail 72 is fixedly connected to the high vacuum chamber 41 through a guide rail fixing block 71. The self-driven slider 73 and the driven slider 74 are slidably connected to the guide rail 72. The self-driven slider 73 is provided with a driving unit.

[0052] The sintering platform 61 includes a first fixed plate 611 and a second fixed plate 612. The first fixed plate 611 is fixedly connected to the self-driven slider 73, and the second fixed plate 612 is fixedly connected to the driven slider 74.

[0053] In this embodiment, during sintering, the sliding seal 43 between the high vacuum chamber 41 and the upper electrode 13 and lower electrode 15 ensures that a high vacuum level is maintained during the sintering process, thus improving the sintering quality of the sintered sample. The guide rail 72 in the transfer module 7 is fixedly connected to the high vacuum chamber 41 via guide rail fixing blocks 71, with both ends extending to the inside of the high vacuum gate valve 42. The sintering platform 61 is fixedly connected to the self-driven slider 73 and the driven slider 74 via the first fixing plate 611 and the second fixing plate 612, respectively. Before sintering, the self-driven slider 73, driven by the driving unit, pulls the sintering unit 6 to the sintering station (directly below the upper electrode 13); after sintering, the self-driven slider 73 pulls the sintering unit 6 to the other side and through the high vacuum gate valve 42 to reach other high vacuum modules. The sintering platform is connected to the conveying module through the first and second fixed plates, realizing the overall switching of the sintering unit and avoiding the coordination disorder caused by single-point floating. Compared with the traditional SPS feeding system, it reduces the intervention of the robot arm and significantly improves the theoretical production capacity.

[0054] The upper punch 14 is fixedly connected to the upper electrode 13.

[0055] Working principle: Before sintering, the self-driven slider 73 is driven by the driving unit to pull the sintering unit 6 along the guide rail 72 to the sintering station (directly below the upper electrode 13).

[0056] During sintering, the screw jack 51 of the lifting module 5 first receives power from the motor to push the screw 52 upward, causing the lower electrode 15 to move upward through the high vacuum chamber 41 until it contacts the lower end of the floating lower punch module 63. At this time, the lower electrode 15 continues to move upward, pushing the floating lower punch module 63 to slide upward along the lower guide post 65 for a certain distance. The floating lower punch module 63 simultaneously pushes the floating mold module 62 and the sintering sample material 8, which are in contact with it, to slide upward along the upper guide post 64 for a certain distance, so that the floating lower punch module 63 and the floating mold module 62 are separated from the sintering platform 61. Next, the hydraulic cylinder 21 of the pressure generating module 2 pushes the piston rod 22 downward. The piston rod 22 pushes the upper punch 14, which is fixedly connected to the piston rod 22 via the upper electrode 13, downward until the upper punch 14 contacts the upper surface of the sintering sample material 8. The hydraulic cylinder 21 outputs pressure to the sintering sample material 8 through the piston rod 22, the upper electrode 13, and the upper punch 14. At this time, the power supply module 1 outputs the current generated by the current generating device 11 to the upper and lower surfaces of the sintering sample raw material 8 through the conductive strip 12, the upper electrode 13 and the lower electrode 15, thus completing the sintering of the sample.

[0057] After sintering, all components return to their original positions, and the self-driven slider 73 pulls the sintering unit 6 to move to the other side and through the high vacuum insert valve 42 to reach other high vacuum modules.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A flash sintering apparatus for high current and high pressure, comprising a power supply module (1), a pressure generating module (2), a support frame (3), a high vacuum module (4), and a sintering unit (6) for accommodating raw materials (8) for sintering samples, characterized in that, Also includes: Lifting module (5) and conveying module (7); The sintering unit (6) includes a fixed sintering platform (61) and a floating mold module (62) and a floating lower punch module (63) that are slidably disposed on the sintering platform (61) via a guide mechanism. The lifting module (5) is located below the sintering platform (61), and its output end acts on the floating lower punch module (63) to drive the floating lower punch module (63) together with the floating mold module (62) to rise along the guide mechanism, so that the floating mold module (62) and the floating lower punch module (63) as a whole are separated from the sintering platform (61) and form a floating docking state; The pressure generating module (2) is positioned above the sintering platform (61), and its output end acts on the upper punch (14) located in the floating mold module (62) to apply pressure to the sintering sample raw material (8). The power supply module (1) is used to provide sintering current to the upper punch (14) and the floating lower punch module (63); The conveying module (7) is connected to the sintering platform (61) and is used to drive the sintering unit (6) as a whole to move between different work stations; The guiding mechanism includes an upper guide column (64) and a lower guide column (65) fixedly installed on the sintering platform (61). The floating mold module (62) is slidably engaged with the upper guide post (64), and the floating lower punch module (63) is slidably engaged with the lower guide post (65); The floating mold module (62) includes a mold (621), and a floating mold holder (622) is provided on the outside of the mold (621). The floating lower punch module (63) includes a first T-shaped lower punch (631), the first punch shaft surface (6311) of the first T-shaped lower punch (631) is always in sliding contact with the inner surface of the mold (621), and the upper surface (6312) of the first punch of the first T-shaped lower punch (631) is in periodic contact with the lower surface of the mold (621).

2. The flash sintering equipment for high current and high pressure as described in claim 1, characterized in that, A first sliding sleeve (623) is provided between the floating mold holder (622) and the upper guide post (64). The first sliding sleeve (623) is clearance-fitted with the upper guide post (64) and interference-fitted with the floating mold holder (622).

3. The flash sintering equipment for high current and high pressure according to claim 2, characterized in that, The first T-shaped lower punch (631) is fixedly connected to the second T-shaped lower punch (632), and the second T-shaped lower punch (632) is connected in sequence to the insulating gasket (634) and the floating lower punch holder (633).

4. The flash sintering equipment for high current and high pressure according to claim 3, characterized in that, A second sliding sleeve (635) is provided between the floating lower punch holder (633) and the lower guide post (65). The second sliding sleeve (635) is clearance-fitted with the lower guide post (65) and interference-fitted with the floating lower punch holder (633).

5. A flash sintering apparatus for high current and high pressure as described in claim 1, characterized in that, The high vacuum module (4) includes a high vacuum chamber (41), and high vacuum gate valves (42) for isolating work stations are provided on both sides of the high vacuum chamber (41). A sliding seal (43) is provided between the high vacuum chamber (41) and the output end of the pressure generating module (2) and the output end of the lifting module (5).

6. A flash sintering apparatus for high current and high pressure as described in claim 1 or 5, characterized in that, The conveying module (7) includes a guide rail (72) and a self-driven slider (73) and a driven slider (74) that can move on the guide rail (72). The sintering platform (61) is connected to the self-driven slider (73) through a first fixing plate (611) and to the driven slider (74) through a second fixing plate (612).

7. A flash sintering apparatus for high current and high pressure as described in claim 1, characterized in that, The upper punch (14) is fixedly connected to the upper electrode (13) of the power supply module (1).

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