Rapid Joule heating high-temperature furnace

Abstract

The utility model belongs to the technical field of Joule heat application, and particularly relates to a rapid Joule heat high-temperature furnace, which comprises an adjustable direct-current power supply, a positive electrode and a negative electrode, the positive electrode and the negative electrode are respectively electrically connected with a positive electrode and a negative electrode, the positive electrode and the negative electrode are bilaterally symmetrically arranged at the bottom of a vacuum box in a penetrating manner, and two C-shaped clamps are arranged in the vacuum box. The two C-shaped clamps are respectively connected to the upper ends of the positive electrode and the negative electrode, the heating body is fixedly clamped on the two C-shaped clamps, the graphite sheet is arranged at the contact part of the heating body and the C-shaped clamps, four crucible supporting legs are arranged on the lower surface of the crucible, the lower ends of the crucible supporting legs penetrate through the heating body to be in contact with the vacuum box, and raw material powder is filled in the crucible. The crucible cover is arranged on the crucible, raw material powder is contained in the crucible, and the high-temperature furnace can be rapidly heated by directly electrifying the heating body, so that the sintering time of materials is shortened.

Description

Technical Field

[0001] The utility model belongs to the technical field of Joule heat application, and in particular relates to a rapid Joule heat high-temperature furnace. Background Art

[0002] In 1841, British physicist Joule discovered a crucial phenomenon: the generation of heat when electric current passes through a conductor, a phenomenon known as "Joule heating." In recent years, researchers have cleverly exploited the Joule heating generated by high currents flowing through conductive powders to trigger reactions in a transient high-temperature environment, successfully producing a series of innovative nanomaterials such as graphene, carbon fiber, nanotubes, and high-entropy alloys. To achieve temperatures reaching 2000°C, researchers typically use graphite as the heating element. This is due to its high melting point (3850°C) and high electrical resistance, which allows for more efficient conversion of electrical energy into heat at the same current.

[0003] Currently, mainstream high-temperature furnaces use medium-frequency induction heating of graphite crucibles. This method first converts electrical energy into a medium-frequency magnetic field, which then acts on the graphite crucible to generate current, ultimately heating the material within. However, this induction heating method is not only energy-intensive but also slow. Typically, raising the temperature to 2800°C and then cooling it back to room temperature takes a full day, resulting in inefficient and costly high-temperature firing. Utility Model Content

[0004] Aiming at the problems of high energy consumption and slow heating speed of existing high temperature furnaces, the utility model designs a fast Joule heat high temperature furnace, which not only realizes rapid heating but also can accurately control the Joule heat temperature.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A rapid Joule heat high-temperature furnace comprises an adjustable DC power supply, a positive electrode, a negative electrode, a C-shaped clamp, a graphite sheet, a heating element, crucible legs, a crucible, a crucible cover and a vacuum box, wherein the positive and negative electrodes of the adjustable DC power supply are electrically connected to the positive electrode and the negative electrode respectively, the positive electrode and the negative electrode are symmetrically arranged through the bottom of the vacuum box, there are two C-shaped clamps, both are located in the vacuum box, and are respectively connected to the upper ends of the positive electrode and the negative electrode, the heating element is fixedly mounted on the two C-shaped clamps, the graphite sheet is arranged at the contact position between the heating element and the C-shaped clamp, four crucible legs are arranged on the lower surface of the crucible, the lower ends of the crucible legs pass through the heating element and contact the vacuum box, the crucible is filled with raw material powder, the crucible cover is arranged on the crucible, the crucible comprises an outer shell, an inner shell is arranged inside the outer shell, and a accommodating cavity for placing raw material powder is formed between the inner shell and the outer shell.

[0007] Furthermore, the heating element is made of graphite or tungsten.

[0008] Furthermore, the shape of the heating element is a serpentine plane so as to increase the heating area.

[0009] Furthermore, the crucible is made of graphite or boron nitride, so that it can withstand rapid temperature increase without cracking.

[0010] Furthermore, a temperature measuring window is opened on the top of the vacuum box, and a No. 1 temperature measuring probe and a No. 2 temperature measuring probe are arranged above the temperature measuring window. The No. 1 temperature measuring probe detects the temperature of the heating element through the temperature measuring window, the No. 1 through hole on the crucible cover and the No. 2 through hole in the middle of the inner shell, and the No. 2 temperature measuring probe detects the temperature of the crucible cover through the temperature measuring window.

[0011] Furthermore, the first temperature measuring probe and the second temperature measuring probe are both connected to the input end of the controller.

[0012] Furthermore, the output end of the controller is connected to an adjustable DC power supply, and the controller receives signals from the first temperature probe and the second temperature probe to adjust the output power of the adjustable DC power supply.

[0013] Furthermore, the crucible legs are threadedly connected to the crucible to facilitate adjustment of the distance between the crucible and the heating element.

[0014] Compared with the prior art, the utility model has the following advantages:

[0015] 1. The method of directly applying electricity to the heating element in the utility model can quickly heat the high-temperature furnace to 2800°C, significantly shortening the sintering time of the material.

[0016] 2. This utility model uses a No. 1 temperature probe to directly monitor the temperature of the heating element and provides real-time feedback to the controller. The controller then adjusts the discharge voltage and current of the adjustable DC power supply to achieve precise control of the heating element temperature, ensuring temperature stability and effectively preventing the risk of damage to the heating element caused by current runaway. Simultaneously, this utility model also provides a No. 2 temperature probe to measure the temperature of the crucible lid, accurately providing feedback on the minimum temperature of the high-temperature furnace.

[0017] 3. The utility model has accurate temperature control and simple operation, which significantly improves the efficiency of high-temperature firing and reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of the utility model;

[0019] Figure 2 This is a schematic diagram of the shape of the heating element in the present invention;

[0020] Figure 3This is a schematic diagram of the crucible structure in the present utility model;

[0021] Figure 4 This is a schematic diagram of the crucible cover structure in the present utility model;

[0022] In the figure: adjustable DC power supply 1, positive electrode 2, negative electrode 3, C-type clamp 4, graphite sheet 5, heating element 6, crucible legs 7, crucible 8, raw material powder 9, crucible cover 10, vacuum box 11, measuring window 12, temperature probe No. 1 13, controller 14, temperature probe No. 2 15, inner shell 16, outer shell 17, through hole No. 2 21, through hole No. 1 22. DETAILED DESCRIPTION

[0023] In order to further illustrate the technical solution of the present invention, the present invention will be further described below with reference to the accompanying drawings.

[0024] like Figures 1 to 4As shown, a rapid Joule heating high temperature furnace device includes an adjustable DC power supply 1, a positive electrode 2, a negative electrode 3, a C-type clamp 4, a graphite sheet 5, a heating element 6, a crucible leg 7, a crucible 8, a raw material powder 9, a crucible cover 10 and a vacuum box 11. The positive and negative electrodes of the adjustable DC power supply 1 are electrically connected to the positive electrode 2 and the negative electrode 3 respectively. The positive electrode 2 and the negative electrode 3 are symmetrically arranged through the bottom of the vacuum box 11. There are two C-type clamps 4, both located in the vacuum box 11. Placing the heating system in the vacuum box has good stability and safety, and respectively It is connected to the upper ends of the positive electrode 2 and the negative electrode 3, which significantly shortens the sintering time of the material. The heating element 6 is fixedly mounted on two C-shaped clamps 4. The graphite sheet 5 is arranged at the contact portion between the heating element 6 and the C-shaped clamp 4. The graphite sheet has good electrical conductivity, so that the heating element is evenly heated by electricity. Four crucible legs 7 are provided on the lower surface of the crucible 8. The lower ends of the crucible legs 7 pass through the heating element 6 and contact the vacuum box 11. The heating element 6 is made of graphite or tungsten and has a serpentine plane shape to increase the heating area. The crucible 8 is filled with raw material powder 9. The crucible cover 10 is arranged on the crucible 8, and the crucible 8 includes an outer shell 17, an inner shell 16 is arranged inside the outer shell 17, and a receiving cavity for placing the raw material powder 9 is formed between the inner shell 16 and the outer shell 17. The material of the crucible 8 is graphite or boron nitride, which can withstand rapid temperature increase without cracking. A temperature measuring window 12 is opened on the top of the vacuum box 11, and a No. 1 temperature measuring probe 13 and a No. 2 temperature measuring probe 15 are arranged above the temperature measuring window 12. The No. 1 temperature measuring probe 13 is through the temperature measuring window 12, the No. 1 through hole 22 on the crucible cover 10, and the No. 2 through hole in the middle of the inner shell. The through hole 21 detects the temperature of the heating element, and the second temperature probe 15 detects the temperature of the crucible cover through the temperature measuring window 12. The first temperature probe 13 and the second temperature probe 15 are both connected to the input end of the controller 14, and the output end of the controller 14 is connected to the adjustable DC power supply 1. The controller 14 receives signals from the first temperature probe 13 and the second temperature probe 15, and adjusts the output power of the adjustable DC power supply 1, thereby achieving precise control of the temperature of the heating element and effectively avoiding possible damage or burning of the heating element at high temperature.

[0025] The main features and advantages of the present invention are shown and described above. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive. The scope of the present invention is defined by the appended claims rather than the foregoing description, and all variations that come within the meaning and range of equivalents of the claims are intended to be included within the present invention.

[0026] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A rapid Joule heat high temperature furnace, characterized in that: The invention comprises an adjustable DC power supply (1), a positive electrode (2), a negative electrode (3), a C-type clamp (4), a graphite sheet (5), a heating element (6), a crucible (8), a crucible cover (10) and a vacuum box (11). The positive electrode and the negative electrode of the adjustable DC power supply (1) are electrically connected to the positive electrode (2) and the negative electrode (3) respectively. The positive electrode (2) and the negative electrode (3) are symmetrically arranged on the bottom of the vacuum box (11). There are two C-type clamps (4), both of which are located in the vacuum box (11) and are connected to the upper ends of the positive electrode (2) and the negative electrode (3) respectively. The heating element (6) is fixedly mounted On the two C-shaped clamps (4), the graphite sheet (5) is arranged at the contact position between the heating element (6) and the C-shaped clamp (4), and four crucible legs (7) are arranged on the lower surface of the crucible (8), and the lower ends of the crucible legs (7) pass through the heating element (6) and contact the vacuum box (11). The crucible (8) is filled with raw material powder (9), and the crucible cover (10) is arranged on the crucible (8). The crucible (8) includes an outer shell (17), and an inner shell (16) is arranged inside the outer shell (17). A accommodating cavity for placing the raw material powder (9) is formed between the inner shell (16) and the outer shell (17).

2. The rapid Joule heating high temperature furnace according to claim 1, characterized in that: The heating element (6) is made of graphite or tungsten.

3. The rapid Joule heating high temperature furnace according to claim 2, characterized in that: The shape of the heating element (6) is a serpentine plane so as to increase the heating area.

4. The rapid Joule heating high temperature furnace according to claim 1, characterized in that: The crucible (8) is made of graphite or boron nitride, so that it can withstand rapid temperature increases without cracking.

5. The rapid Joule heat high temperature furnace according to claim 4, characterized in that: A temperature measuring window (12) is provided on the top of the vacuum box (11), and a first temperature measuring probe (13) and a second temperature measuring probe (15) are provided above the temperature measuring window (12). The first temperature measuring probe (13) detects the temperature of the heating element (6) through the temperature measuring window (12), the first through hole (22) on the crucible cover (10), and the second through hole (21) in the middle of the inner shell (16), and the second temperature measuring probe (15) detects the temperature of the crucible cover (10) through the temperature measuring window (12).

6. The rapid Joule heat high temperature furnace according to claim 5, characterized in that: The first temperature measuring probe (13) and the second temperature measuring probe (15) are both connected to the input end of the controller (14).

7. The rapid Joule heat high temperature furnace according to claim 6, characterized in that: The output end of the controller (14) is connected to the adjustable DC power supply (1), and the controller (14) receives signals from the first temperature probe (13) and the second temperature probe (15) to adjust the output power of the adjustable DC power supply (1).

8. The rapid Joule heating high temperature furnace according to claim 1, characterized in that: The crucible legs (7) are threadedly connected to the crucible (8) to facilitate adjustment of the distance between the crucible (8) and the heating element (6).

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