CN118218593A - A conductive hot pressing sintering method and device - Google Patents

Abstract

The present invention discloses a conductive hot pressing sintering method and device, including a pressure head, a conductive copper sheet, a mold, a fixture and a thermocouple, wherein the interior of the mold is wrapped with a powder to be hot pressed, and the upper and lower ends of the powder to be hot pressed are both provided with a graphite pressure head, the outer wall of the mold is wrapped with ceramic fiber paper, and fixtures are installed on both sides of the outer wall of the ceramic fiber paper, a thermocouple is inserted in the joint between the fixture and the ceramic fiber paper, a copper pressure head is installed on the outer side of the graphite pressure head, and conductive copper sheets are arranged on the upper ends of the two groups of copper pressure heads. The conductive hot pressing sintering method and device generates heat under the condition of power on, realizes self-heating of the powder to be hot pressed, applies pressure while heating, realizes conductive hot pressing sintering of the powder, utilizes the thermal effect of current passing through the sample to generate heating inside, thereby realizing a more flexible and higher heating rate, greatly improving the preparation and production efficiency; at the same time, the internal temperature distribution of the sintered material is also more uniform.

Description

A conductive hot pressing sintering method and device

Technical Field

The invention relates to the technical field of sintering methods and equipment, and in particular to an electrical conductive hot pressing sintering method and device.

Background technique

Nowadays, powders are used to prepare molding materials, usually using powder metallurgy methods and corresponding equipment for molding. Powder metallurgy methods usually include room temperature pressure molding, high temperature and normal pressure sintering, and hot pressing sintering. The preparation process of room temperature pressure molding and high temperature and normal pressure sintering is generally completed in three steps: powder mixing, normal pressure molding, and high temperature and normal pressure sintering;

Normal temperature pressure forming and high temperature and normal pressure sintering have relatively poor performance of sintered products due to the low pressure during the sintering process, low material density and sintering degree; while the hot pressing sintering method realizes sintering under high temperature and high pressure, which can obtain materials with higher density than normal pressure sintering. Therefore, the materials prepared by the hot pressing sintering method usually have better performance due to the strong bond between particles, and are currently widely used. According to the principles and methods of hot pressing sintering, related hot pressing sintering equipment is also designed and produced;

Traditional hot pressing sintering methods and devices usually use heating elements such as resistance wires or electromagnetic induction heating molds as external heat sources to generate heat. The external heat source transfers heat to the pressurized sintering mold through heat conduction, convection, and radiation, and further transfers heat to the powder in the mold through heat conduction, and heats and sinters under pressure. The speed of the heat source heating rate determines the internal temperature distribution of the powder metallurgical sample. A heating rate that is too high will cause the temperature gradient inside the material to be too high, resulting in poor sintering uniformity; a heating rate that is too low will reduce production efficiency;

For metal powders, alloy powders, and metal, metal and inorganic non-metal mixed powders with certain conductive properties, although traditional hot pressing and sintering methods and equipment can be used for hot pressing and sintering to prepare corresponding powder metallurgical materials during powder metallurgy, there are problems such as slow heating rate and poor adjustment flexibility, excessive temperature gradient and uneven sintering, expensive equipment and low efficiency during the hot pressing process.

Summary of the invention

The purpose of the present invention is to provide a method and device for preparing materials by hot pressing and sintering powders under power-on conditions, utilizing the conductivity of the powder material itself, so as to solve the problems of slow heating rate and poor adjustment flexibility, excessive temperature gradient and uneven sintering, expensive equipment and low efficiency during hot pressing.

To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a conductive hot pressing sintering method and device, comprising a pressure head, a conductive copper sheet, a mold, a clamp and a thermocouple, wherein the interior of the mold is wrapped with a powder to be hot pressed, and a graphite pressure head is arranged at the upper and lower ends of the powder to be hot pressed, the outer wall of the mold is wrapped with ceramic fiber paper, and clamps are installed on both sides of the outer wall of the ceramic fiber paper, a thermocouple is interspersed between the fitting part of the clamp and the ceramic fiber paper, a copper pressure head is installed on the outer side of the graphite pressure head, and conductive copper sheets are arranged on the upper ends of two groups of the copper pressure heads, an insulating plate is installed on the opposite side of the outer wall of the conductive copper sheet, and pressure heads are installed on the outer sides of the upper and lower groups of the insulating plates, and the outer sides of the two groups of the conductive copper sheets are electrically connected to a power supply.

Furthermore, the conductive copper sheets include bolts, gaskets, current-carrying wires and nuts. Bolts are installed at one horizontal end of the two groups of conductive copper sheets, and gaskets are installed on the outer walls of the bolts. The outer walls of the gaskets are electrically connected to the current-carrying wires, and nuts are installed on the bottoms of the bolts.

Furthermore, a terminal is installed on the outer wall of the power supply, and the terminal is electrically connected to the conductive copper sheet through the power-carrying wire.

Furthermore, bolt rods are installed on both sides of the outer wall of the clamp, and nuts are threadedly connected to the outer sides of the bolt rods, and the two groups of clamps form a detachable structure through the bolt rods and the nuts.

Furthermore, the press workbench is arranged at the upper and lower outer ends of the pressing head, and a pressure control device is arranged on the top of the press workbench at the upper end.

Furthermore, the mold is configured as an alumina ceramic tube.

Furthermore, the hot end of the thermocouple is inserted into the joint between the fixture and the ceramic fiber paper, and the cold end of the thermocouple is connected to a temperature measuring device.

Furthermore, the temperature measuring device may be configured as a thermometer.

Furthermore, the temperature measuring device may be configured as a thermometer display.

Furthermore, the area of the insulating plate is larger than the area of the connected conductive copper sheet.

Furthermore, the insulating plate should be the middle part connecting the upper and lower pressure heads and the conductive copper sheet. During the process of applying pressure, it plays the role of transmitting pressure and hindering the current of the conductive copper plate from flowing to the upper and lower pressure heads. Therefore, it must have a certain pressure resistance and insulation effect. The present invention uses asbestos board as the insulating board, the thickness of which is generally selected to be above 10-20mm, and the area should be larger than the area of the conductive copper sheet.

Furthermore, the power supply of the power supply device can be selected as AC or DC, and the appropriate output voltage and current range should be selected according to the resistance of the powder. The present invention uses a DC power supply, one end of the output load line is connected to the positive and negative poles of the DC power supply's large current output, and the other end is connected to the power-carrying wire and fixed to the power-carrying wire using a nut.

Furthermore, a hole should be drilled at one end of the conductive copper sheet, and a nut should be used to connect the current-carrying wire to the conductive copper sheet. Both sides of the conductive copper sheet should be polished smooth, especially the side in contact with the copper pressure head needs to be smooth. Sandpaper should be used to polish it smooth to prevent sparks caused by discharge due to excessive resistance. The thickness of the conductive copper sheet is about 3-10mm, and it has good pressure resistance.

Furthermore, the copper pressure head is made of red copper, which has a high copper content of 99%, good conductivity, second only to silver in metals, and has a higher softening temperature than brass. The contact surface is polished smooth with sandpaper to prevent discharge sparks caused by excessive contact surface resistance. The thickness of the copper pressure head ranges from about 10 to 50 mm.

Furthermore, the graphite press head has good conductivity at high temperature and graphite has excellent high temperature stability, can withstand thermal stress under high temperature conditions without being easily deformed or cracked, and graphite does not react with the powder to be pressed under high temperature and high pressure, which is conducive to demolding. The thickness of the graphite press head is about 10-50mm.

Furthermore, the alumina ceramic tube acts as a mold. In order to allow the current to continuously flow into the powder to be hot-pressed, it must play the role of insulation, high temperature resistance and certain pressure resistance.

Furthermore, the clamp is made of steel, and both ends of the clamp have holes for clamping the ceramic fiber paper, which is easy to process and low in cost.

Compared with the prior art, the beneficial effects of the present invention are as follows: the conductive hot pressing sintering method and device, taking into account the temperature uniformity and production efficiency inside the powder metallurgical sample, fully utilizes the conductivity of the powder itself to combine the heat source with the sample itself, and realizes hot pressing sintering under internal heat source heating conditions under pressurized conditions. When current passes through the hot pressing sintering sample, heat will be uniformly generated inside the sample, and by controlling the magnitude of current and voltage, it is possible to achieve more flexible and wider range of heating rate control than the traditional hot pressing sintering method to adapt to the preparation of different powder metallurgical materials, and utilizes the thermal effect of current passing through the sample to generate heating inside, thereby achieving more flexible and higher heating rates, greatly improving the preparation and production efficiency; at the same time, the temperature distribution inside the sintered material is also more uniform.

1. In the present invention, the conductive hot pressing device is provided with a graphite pressure head, so that when the copper pressure head is hot-pressing the powder to be hot-pressed, the copper pressure head can contact with the powder to be hot-pressed through the graphite pressure head, thereby avoiding the copper pressure head being softened and stuck together due to the high temperature and high pressure during sintering of the powder to be hot-pressed. The graphite pressure head has good conductivity at high temperature and graphite has excellent high temperature stability, can withstand thermal stress under high temperature conditions without being easily deformed or cracked, and graphite does not react with the powder to be pressed under high temperature and high pressure, which is conducive to demolding, has high safety performance and improves the quality of the finished product of the powder to be hot-pressed.

According to the resistance of the powder to be hot pressed, the formula can be used to calculate the required heating time and the magnitude of the power-on voltage and current, which greatly reduces the heating time and improves production efficiency. Since the powder to be hot pressed is heated by electricity inside, the temperature gradient inside the powder to be hot pressed is small, which improves the performance of the finished product;

The ceramic fiber paper is sandwiched between the alumina ceramic tube and the fixture. The outer periphery of the ceramic fiber paper is covered with the fixture. The nut on the fixture is tightened to compress the ceramic fiber paper. Its function is to apply pressure to the alumina ceramic tube from the outside to prevent the internal pressure of the alumina ceramic tube from being damaged. Another function is that the ceramic fiber paper has a good thermal insulation effect and is resistant to high temperatures.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic front view of the structure of an electrical conductive hot pressing sintering device according to the present invention;

FIG2 is a schematic top view of the structure of an electrically conductive hot pressing sintering device according to the present invention;

FIG3 is a schematic diagram of the A-A cross-sectional structure of FIG2 of an electrical conductive hot pressing sintering device of the present invention;

FIG4 is a schematic diagram of a top view of a conductive copper plate of a conductive hot-pressing sintering device according to the present invention;

FIG. 5 is a schematic diagram of a fixture structure of an electrically conductive hot pressing sintering device according to the present invention.

In the figure: 1. pressure head; 2. insulating plate; 3. conductive copper sheet; 31. bolt; 32. gasket; 33. current-carrying wire; 34. nut; 4. copper pressure head; 5. graphite pressure head; 6. mold; 7. ceramic fiber paper; 8. clamp; 9. bolt rod; 91. nut; 10. powder to be hot-pressed; 11. power supply; 12. terminal; 13. thermocouple; 14. press workbench; 15. pressure control device.

Detailed ways

In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

As shown in Figures 1-5, the present invention provides a technical solution: a conductive hot pressing sintering method and device, including a pressure head 1, a conductive copper sheet 3, a mold 6, a clamp 8 and a thermocouple 13, the interior of the mold 6 is wrapped with a powder body 10 to be hot pressed, and a graphite pressure head 5 is arranged at the upper and lower ends of the powder body 10 to be hot pressed, the outer wall of the mold 6 is wrapped with a ceramic fiber paper 7, and clamps 8 are installed on both sides of the outer wall of the ceramic fiber paper 7, and a thermocouple 13 is inserted at the joint between the clamp 8 and the ceramic fiber paper 7, a copper pressure head 4 is installed on the outer side of the graphite pressure head 5, and a conductive copper sheet 3 is arranged on the upper ends of two groups of copper pressure heads 4, an insulating plate 2 is installed on the opposite side of the outer wall of the conductive copper sheet 3, and the pressure head 1 is installed on the outer sides of the upper and lower groups of insulating plates 2, and the outer sides of the two groups of conductive copper sheets 3 are electrically connected to a power supply 11.

The conductive hot pressing sintering method refers to turning on the power supply 11 switch under pressurized conditions according to the conductivity of the powder 10 to be hot pressed itself, and the current flows through the terminal 12, the power-carrying wire 33, the upper conductive copper sheet 3, the upper copper pressure head 4, the upper graphite pressure head 5, the powder 10 to be hot pressed, the lower graphite pressure head 5, the lower copper pressure head 4, the lower conductive copper sheet 3, and the power-carrying wire 33 in sequence to form a closed loop, generating heat under the condition of power on, realizing self-heating of the powder 10 to be hot pressed, and applying pressure while heating to realize conductive hot pressing sintering of the powder.

The conductive hot pressing sintering device should include five parts: mold, fixture, pressure application, power control and temperature measurement;

Device mold part: This device uses an alumina ceramic tube as a mold 6, which has high temperature resistance, insulation, and high temperature stability. Its function is to allow current to flow to the powder to be hot-pressed 10. It is not easy to deform under high temperature and high pressure. It can be designed and processed into a relatively complex shape according to production needs;

The fixture part of the device is composed of a fixture 8 of a specific shape, a bolt rod 9, and a nut 91. An alumina ceramic tube is used outside the powder 10 to be hot-pressed, and a ceramic fiber paper 7 is used to wrap the outer periphery of the alumina ceramic tube. The outer periphery of the ceramic fiber paper 7 is covered with a fixture 8. The bolt rod 9 on the fixture 8 is tightened to press the ceramic fiber paper 7, which plays the role of clamping the mold 6, the ceramic fiber paper 7 and the hot end of the thermocouple 13;

The pressure applying part of the device includes a press workbench 14 and upper and lower pressing heads 1. An insulating plate 2 is connected between the upper and lower pressing heads 1 and the conductive copper sheet 3. The area of the insulating plate 2 should be larger than the area of the conductive copper sheet 3. The required pressure is applied to the upper and lower pressing heads 1. The pressure passes through the insulating plate 2, the upper copper pressing head 3, and the upper graphite pressing head 4 in sequence to reach the powder body 10 to be hot pressed, and the pressure is applied to the powder body 10 to be hot pressed;

The power-on control part of the device: the upper conductive copper sheet 3 is connected to the bottom of the insulating plate 2, one end of the upper conductive copper sheet 3 needs to be connected to the positive electrode of the power supply 11, the upper copper pressure head 4 is connected to the bottom of the upper conductive copper sheet 3, the upper graphite pressure head 5 is connected to the bottom of the upper copper pressure head 4, the upper graphite pressure head 5 presses the powder to be hot-pressed 10 from the top, the lower graphite pressure head 5 is connected to the bottom of the powder to be hot-pressed 10, the lower graphite pressure head 5 presses the powder to be hot-pressed 10 from the bottom, the lower graphite pressure head 5 is connected to the lower copper pressure head 4, the lower copper pressure head 4 is connected to the lower conductive copper sheet 3, the other end of the lower conductive copper sheet 3 is connected to the negative electrode of the power supply, and the bottom is connected to the insulating plate 1 to form a closed circuit;

Temperature measurement part of the device: the hot end of the thermocouple 13 is placed between the outer periphery of the alumina ceramic tube of the powder to be hot pressed and the ceramic fiber paper 7, and the cold end is connected to a temperature measuring device, usually a thermometer or a thermometer display, to observe the temperature of the powder 10 to be hot pressed;

The conductive copper sheet 3 includes a bolt 31, a gasket 32, a power-carrying wire 33 and a nut 34. The bolt 31 is installed at one horizontal end of the two groups of conductive copper sheets 3, and the outer wall of the bolt 31 is sleeved with a gasket 32, and the outer wall of the gasket 32 is electrically connected to the power-carrying wire 33, and the bottom of the bolt 31 is sleeved with a nut 34; the outer wall of the power source 11 is installed with a terminal 12, and the terminal 12 is electrically connected to the conductive copper sheet 3 through the power-carrying wire 33; the outer wall of the clamp 8 is installed with bolt rods 9 on both sides. , and the outer side of the bolt rod 9 is threadedly connected with a nut 91, and the two sets of clamps 8 form a detachable structure through the bolt rod 9 and the nut 91; the press workbench 14 is arranged at the upper and lower outer ends of the pressure head 1, and the top of the upper press workbench 14 is provided with a pressure control device 15, and the pressure control device 15 has a stable output to keep the applied pressure unchanged; the mold 6 is set as an alumina ceramic tube; the hot end of the thermocouple 13 is inserted into the joint of the clamp 8 and the ceramic fiber paper 7, and the cold end of the thermocouple 13 is connected with a temperature measuring device;

The area of the insulating plate 2 is larger than the area of the conductive copper sheet 3; the insulating plate 2 should be the middle part connecting the upper and lower pressure heads and the conductive copper sheet 3. During the pressure application process, it plays a role in transmitting pressure and preventing the current of the conductive copper sheet 3 from flowing to the upper and lower pressure heads, so it must have a certain pressure resistance and insulation effect. The present invention uses an asbestos board as the insulating plate, the thickness of which is generally selected to be more than 10-20 mm, and the area should be larger than the area of the conductive copper sheet 3;

The power supply 11 of the power supply device can select AC or DC, and the appropriate output voltage and current range should be selected according to the resistance of the powder. The present invention uses a DC power supply, one end of the output load line is connected to the positive and negative poles of the DC power supply's large current output, and the other end is connected to the power-carrying wire 33, and is fixed to the power-carrying wire 33 using a nut;

A hole should be punched at one end of the conductive copper sheet 3, and a nut should be used to connect the power-carrying wire 33 to the conductive copper sheet 3. Both sides of the conductive copper sheet 3 should be polished smooth, especially the side in contact with the copper pressure head 4 needs to be smooth. Use sandpaper to polish it smooth to prevent sparks caused by excessive resistance. The thickness of the conductive copper sheet 3 is about 3-10mm, which has good pressure resistance.

The copper pressure head 4 is made of red copper, which has a high copper content of 99%, good conductivity, second only to silver in metals, and has a higher softening temperature than brass; the contact surface is polished smooth with sandpaper in turn to prevent the contact surface resistance from being too large to cause discharge sparks, and the thickness of the copper pressure head 4 ranges from about 10-50mm;

Graphite pressure head 5, graphite pressure head 5 has good electrical conductivity at high temperature and graphite has excellent high temperature stability, can withstand thermal stress under high temperature conditions without being easily deformed or broken, and graphite does not react with the powder to be pressed under high temperature and high pressure, which is conducive to demoulding. The thickness of the graphite pressure head is about 10-50mm;

The alumina ceramic tube acts as the mold 6. In order to allow the current to flow continuously into the powder to be hot pressed, it must be insulated, high temperature resistant and have a certain pressure resistance;

The material of the clamp 8 is steel, and both ends of the clamp have holes; its function is to clamp the ceramic fiber paper, and it is easy to process and has low cost.

In summary, when the conductive hot pressing sintering method and device are used, firstly, the outer periphery of the mold 6 of the alumina ceramic tube is wrapped with ceramic fiber paper 7, and the hot end of the thermocouple 13 is placed between the outer periphery of the alumina ceramic tube to be hot pressed and the ceramic fiber paper 7, and the cold end is connected to the temperature measuring device. The outer periphery of the ceramic fiber paper 7 is covered with a clamp 8, and the bolt rod 9 on the clamp 8 is tightened to press the ceramic fiber paper 7. In order to check whether the ceramic fiber paper 7 is fully compressed, a thin iron sheet can be used to insert it into the ceramic fiber paper from above. If it is not easy to insert, it means that it has been compressed and compacted.

Then align the lower pressure head 1 with the center of the alumina ceramic tube and place it on the workbench of the hydraulic press, connect the lower pressure head 1 with an insulating plate 2, place the lower conductive copper sheet 3 on the insulating plate 2, and fix the other end 33 of the lower conductive copper sheet 3 with a nut to connect the negative electrode of the DC power supply, place the lower copper pressure head 4 on the lower conductive copper sheet 3, place the lower graphite pressure head 5 on the lower copper pressure head 4, place the powder to be hot pressed 10 on the lower graphite pressure head 5, place the upper graphite pressure head 5 on the powder to be hot pressed 10, place the upper copper pressure head 4 on the upper graphite pressure head 5, place the upper conductive copper sheet 3 on the upper copper pressure head 4, and fix the other end 33 of the upper conductive copper sheet 3 with a nut to connect the positive electrode of the power supply, connect the upper conductive copper sheet 3 with the insulating plate 2, and connect the upper pressure head 1 on the insulating plate 2 to form a closed circuit. First turn on the hydraulic press switch, wait for the pressure to stabilize, then turn on the current, and apply power and pressure at the same time, and turn on the thermometer display connected to the thermocouple to record the temperature in real time. After completing the set working conditions, keep warm to room temperature, then turn off the DC power supply and the automatic hydraulic press switch, and start demolding the material until the temperature of the thermocouple 13 does not change at room temperature.

It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims (9)

1. A conductive hot pressing sintering device, characterized in that it comprises a pressure head (1), a conductive copper sheet (3), a mold (6), a fixture (8) and a thermocouple (13), wherein the interior of the mold (6) is wrapped with a powder body (10) to be hot pressed, and the upper and lower ends of the powder body (10) to be hot pressed are both provided with a graphite pressure head (5), the outer wall of the mold (6) is wrapped with a ceramic fiber paper (7), and the outer walls of the ceramic fiber paper (7) are provided with fixtures (8) on both sides, A thermocouple (13) is inserted into the joint between the clamp (8) and the ceramic fiber paper (7), a copper pressure head (4) is installed on the outside of the graphite pressure head (5), and a conductive copper sheet (3) is arranged on the upper end of the two groups of copper pressure heads (4), an insulating plate (2) is installed on the opposite side of the outer wall of the conductive copper sheet (3), and pressure heads (1) are installed on the outer sides of the upper and lower groups of the insulating plates (2), and the outer sides of the two groups of the conductive copper sheets (3) are electrically connected to a power source (11). 2. An electrically conductive hot pressing sintering device according to claim 1, characterized in that: the conductive copper sheet (3) comprises a bolt (31), a gasket (32), a current-carrying wire (33) and a nut (34), the horizontal ends of the two groups of conductive copper sheets (3) are installed with a bolt (31), and the outer wall of the bolt (31) is sleeved with a gasket (32), and the outer wall of the gasket (32) is electrically connected to the current-carrying wire (33), and the bottom of the bolt (31) is sleeved with a nut (34). 3. An electrically conductive hot pressing sintering device according to claim 2, characterized in that: a terminal (12) is installed on the outer wall of the power supply (11), and the terminal (12) is electrically connected to the conductive copper sheet (3) through a current-carrying wire (33). 4. An electrically conductive hot pressing sintering device according to claim 1, characterized in that bolt rods (9) are installed on both sides of the outer wall of the clamp (8), and the outer side of the bolt rod (9) is threadedly connected with a nut (91), and the two groups of the clamps (8) form a detachable structure through the bolt rods (9) and the nuts (91). 5. An electrically conductive hot pressing sintering device according to claim 1, characterized in that: the press worktable (14) is arranged at the upper and lower outer ends of the pressing head (1), and a pressure control device (15) is arranged on the top of the upper press worktable (14). 6. The conductive hot pressing sintering device according to claim 1, characterized in that the mold (6) is configured as an alumina ceramic tube. 7. An electric conductive hot pressing sintering device according to claim 1, characterized in that: the hot end of the thermocouple (13) is inserted into the joint between the clamp (8) and the ceramic fiber paper (7), and the cold end of the thermocouple (13) is connected to a temperature measuring device. 8. The electrically conductive hot pressing sintering device according to claim 1, characterized in that the area of the insulating plate (2) is larger than the area of the connecting conductive copper sheet (3). 9. The conductive hot pressing sintering method according to claim 8, characterized in that it comprises the following steps: S1. Provide the conductive hot pressing sintering equipment according to any one of claims 1 to 8; S2, wrapping the outer periphery of the mold (6) with ceramic fiber paper (7); S3, inserting the hot end of the thermocouple (13) between the mold (6) and the ceramic fiber paper (7); and connecting the cold end of the thermocouple (13) to a temperature measuring device; S4, clamping the ceramic fiber paper (7) with a clamp (8) to fix it; S5, placing the fixture (8) on the top of the lower pressure head (1), so that the graphite pressure head (5) at the lower end is inserted into the bottom of the mold (6); S6, placing the powder to be hot pressed (10) inside the mold cavity of the mold (6); S7, controlling the pressure control device (15) at the top to drive the upper pressure head (1) to press down, gradually approaching the inner powder body to be hot pressed (10), so that the upper and lower graphite pressure heads (5) and the powder body to be hot pressed (10) are in contact with each other; S8, control the pressure control device (15) at the top to increase the pressure, turn on the hydraulic press switch, wait for the pressure to stabilize, and then turn on the current, and energize the conductive copper sheet (3) through the power supply (11) through the power-carrying wire (33), and the current flows through the terminal (12), the power-carrying wire (33), the upper conductive copper sheet (3), the upper copper pressure head (4), the upper graphite pressure head (5), the powder to be hot-pressed (10), the lower graphite pressure head (5), the lower copper pressure head (4), the lower conductive copper sheet (3), and the power-carrying wire (33) in sequence to form a closed loop; When electricity is turned on, heat is generated to achieve self-heating of the powder sample, and pressure is applied while heating to achieve conductive hot pressing sintering; S9, the temperature is recorded in real time by the temperature measuring device, and after the set working conditions are completed, the DC power supply and the automatic hydraulic press switch are turned off, and the material is demoulded after the temperature of the thermocouple 13 reaches the room temperature and does not change.