Positive-pressure electric arc discharge furnace for preparing carbon nanomaterials

By introducing positive pressure control and precise atmosphere management in the arc discharge furnace, the problem of limited purity and types of carbon nanoangle materials preparation in the prior art is solved, and the preparation of high-purity carbon nanoangle materials is realized, which enriches the carbon nano-angle materials type.

CN119103849APending Publication Date: 2024-12-10XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY +1
View PDF 0 Cites 0 Cited by

Patent Information

Application Number
CN202411293326.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-09-14
Publication Date
2024-12-10

AI Technical Summary

Technical Problem

It is difficult to prepare high-purity carbon nanoangle materials in existing arc discharge furnaces, and there are limited types.

Method used

A positive voltage arc discharge furnace was designed. By setting up a vacuum pipe and a charge and discharge pipe in the arc furnace tank body, the vacuum and positive pressure control in the furnace chamber is realized, and the electrodes are accurately controlled by using the guide rail screw platform and the electronic control unit. Position and air pressure, combined with the use of high-purity graphite rods, achieve efficient preparation of carbon nanoangle materials.

Benefits of technology

The purity of carbon nano-angle materials is achieved to reach 90%, enriching the types of carbon nano-materials and improving the flexibility and efficiency of the preparation process.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN119103849A_ABST
    Figure CN119103849A_ABST
Patent Text Reader

Abstract

The invention belongs to the technical field of preparation of carbon nanomaterials, and discloses a positive-pressure electric arc discharge furnace for preparing carbon nanomaterials, which comprises an electric arc furnace tank body, a first electrode and a second electrode are respectively mounted at two ends of the electric arc furnace tank body, and the first electrode and the second electrode are matched to clamp a graphite rod and evaporate a graphite electrode through arcing discharge; the electric arc furnace tank body is provided with a vacuumizing pipeline for conveniently vacuumizing a furnace chamber of the electric arc furnace tank body, the electric arc furnace tank body is also provided with an inflating and deflating pipeline for conveniently controlling the air pressure in the furnace chamber of the electric arc furnace tank body, and the electric arc furnace tank body is provided with a pressure display. According to the method, argon is filled into the tank body of the electric arc furnace through the gas filling and discharging pipeline, positive pressure control in the furnace chamber is increased, and positive pressure and different atmospheres can be filled, so that the variety of prepared carbon nanomaterials is enriched, and a new process for preparing the carbon nanohorn material with the purity of 90% is obtained, namely, the carbon nanohorn material is prepared through a positive pressure arc discharge method.
Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] The invention belongs to the technical field of carbon nano material preparation, and in particular relates to a positive pressure arc discharge furnace for preparing carbon nano material. Background Art

[0002] At present, there are arc discharge furnaces and equipment on the market that use arc method to prepare carbon nanotubes, onion-shaped fullerenes and other carbon nanomaterials, but these equipment still have limitations on the types of carbon nanoproducts that can be prepared, such as the inability to prepare carbon nanohorn materials with higher purity. Summary of the invention

[0003] The purpose of the present invention is to provide a positive pressure arc discharge furnace for preparing carbon nanomaterials, so as to solve the above problems existing in the prior art.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A positive pressure arc discharge furnace for preparing carbon nanomaterials comprises an arc furnace tank body, wherein a first electrode and a second electrode are respectively installed at both ends of the arc furnace tank body, so as to clamp a graphite rod through the cooperation of the first electrode and the second electrode and evaporate the graphite electrode through arc discharge; the arc furnace tank body is provided with a vacuum evacuation pipeline for evacuating the furnace chamber of the arc furnace tank body, the arc furnace tank body is also provided with a charging and discharging pipeline for controlling the air pressure in the furnace chamber of the arc furnace tank body, and a pressure display is installed on the arc furnace tank body.

[0006] As a preferred technical solution in the present invention, the first electrode is fixedly installed at one end of the arc furnace tank body, and the second electrode is movably installed at the other end of the arc furnace tank body. The ends of the first electrode and the second electrode close to each other are connected with conductive clamping ends, which are used to clamp the graphite rod through the two conductive clamping ends; the other end of the arc furnace tank body is provided with a guide rail screw platform, which is connected to the second electrode, so as to drive the second electrode to approach or move away from the first electrode through the guide rail screw platform.

[0007] As a preferred technical solution in the present invention, the positive pressure arc discharge furnace also includes a movable cabinet, and the arc furnace tank body and the guide rail screw platform are both installed on the upper end of the movable cabinet; a vacuum pump and an argon arc welding machine are installed in the movable cabinet, the argon arc welding machine is electrically connected to the first electrode and the second electrode, and the vacuum pump is connected to the vacuum extraction pipeline through a pipeline; an electronic control unit is installed on the movable cabinet, and the electronic control unit is electrically connected to the vacuum pump and the argon arc welding machine.

[0008] As a preferred technical solution in the present invention, a vacuum ball valve is installed between the vacuum pump and the vacuum extraction pipeline, and a manual high-pressure needle valve is installed on the gas charging and discharging pipeline.

[0009] As a preferred technical solution in the present invention, the outer wall of the arc furnace tank is equipped with a cooling water jacket for cooling the arc furnace tank, and the cooling water jacket is connected to a refrigerator through a pipeline.

[0010] As a preferred technical solution in the present invention, the electric arc furnace tank is made of 304 stainless steel, and the first electrode and the second electrode are both made of copper.

[0011] As a preferred technical solution in the present invention, the electric arc furnace tank body is a circular cylinder with an inner diameter of 315 mm and a length of 400 mm. The cooling water jacket is a circular cylinder sealed and sleeved outside the electric arc furnace tank body with an inner diameter of 356 mm and a length of 400 mm. The maximum design pressure of the electric arc furnace tank body is 1.0 MPa and the maximum operating pressure is 0.8 MPa.

[0012] As a preferred technical solution in the present invention, an operating port for placing graphite rods is provided on one side of the electric arc furnace tank body, a blind flange is connected to the operating port through a hinge, a sealing ring is provided between the blind flange and the electric arc furnace tank body, and an observation window is provided in the middle of the blind flange.

[0013] Beneficial effect: Before working, the present invention first uses a vacuum pipe to evacuate the inside of the arc furnace tank, and then fills argon gas into the arc furnace tank through the filling and discharging pipes, thereby increasing the positive pressure control in the furnace chamber. It can be filled with positive pressure (the positive pressure can reach 0.8MPa) and different atmospheres, thereby enriching the types of carbon nanomaterials prepared, and obtaining a new process for preparing carbon nanohorn materials with a purity of 90%, namely, preparing carbon nanohorn materials by positive pressure arc discharge method. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention;

[0015] Figure 2 A top view of the present invention;

[0016] Figure 3 It is a cross-sectional view of the electric arc furnace tank body in the present invention.

[0017] In the figure: 1-arc furnace tank; 101-vacuum extraction pipe; 102-charging and discharging pipe; 103-observation window; 2-first electrode; 3-second electrode; 4-graphite rod; 5-guide rail and screw platform; 6-movable cabinet; 7-vacuum pump; 8-argon arc welding machine; 9-electronic control unit; 10-refrigeration machine. DETAILED DESCRIPTION

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be briefly introduced below in combination with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the structure of the drawings is only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention.

[0019] Example:

[0020] like Figure 1-Figure 3 As shown, this embodiment provides a positive pressure arc discharge furnace for preparing carbon nanomaterials, including an arc furnace tank body 1, and a first electrode 2 and a second electrode 3 are respectively installed at both ends of the arc furnace tank body 1, so as to clamp a graphite rod 4 through the cooperation of the first electrode 2 and the second electrode 3 and evaporate the graphite electrode through arc discharge; the arc furnace tank body 1 is provided with a vacuum evacuation pipeline 101 for evacuating the furnace chamber of the arc furnace tank body 1, so as to prepare carbon nanomaterials in a vacuum environment, and the arc furnace tank body 1 is also provided with a vacuum evacuation pipeline 101 for evacuating the furnace chamber of the arc furnace tank body 1, so as to prepare carbon nanomaterials in a vacuum environment. The filling and discharging pipe 102 of the air pressure in the furnace chamber of the arc furnace tank body 1 is convenient for filling argon into the arc furnace tank body 1, thereby increasing the furnace chamber air pressure of the arc furnace tank body 1. Positive pressure (positive pressure can reach 0.8MPa) and different atmospheres can be filled, thereby enriching the types of prepared carbon nanomaterials, and obtaining a new process for preparing carbon nanohorn materials with a purity of 90%, namely, preparing carbon nanohorn materials by positive pressure arc discharge method. A pressure display is installed on the arc furnace tank body 1, which is convenient for real-time observation of air pressure and thus precise control.

[0021] Before working, the present invention first uses the vacuum pipe 101 to evacuate the inside of the arc furnace tank 1, and then fills argon gas into the arc furnace tank 1 through the gas filling and discharging pipe 102, thereby increasing the positive pressure control in the furnace chamber. It can be filled with positive pressure (the positive pressure can reach 0.8MPa) and different atmospheres, thereby enriching the types of carbon nanomaterials prepared, and obtaining a new process for preparing carbon nanohorn materials with a purity of 90%, namely, preparing carbon nanohorn materials by positive pressure arc discharge method.

[0022] As a preferred implementation scheme in this embodiment, it needs to be further explained that the first electrode 2 is fixedly installed at one end of the arc furnace tank body 1, and the second electrode 3 is movably installed at the other end of the arc furnace tank body 1. The ends of the first electrode 2 and the second electrode 3 close to each other are connected with conductive clamping ends, which are used to clamp the graphite rod 4 through the two conductive clamping ends. In the arc furnace tank body 1, high-purity graphite rods (99.9%) are used as cathodes and anodes, wherein a graphite rod with a diameter of 15 mm and a length of 150 mm is a cathode, and a graphite rod with a diameter of 6 mm and a length of 200 mm is anode. The cathode graphite rod and the anode graphite rod are respectively installed at the two conductive clamping ends; a guide rail screw platform 5 is provided at the other end of the arc furnace tank body 1, and the guide rail screw platform 5 is connected to the second electrode 3, so as to drive the second electrode 3 to approach or move away from the first electrode 2 through the guide rail screw platform 5, and the maximum moving distance is about 0-150 mm.

[0023] As a preferred implementation scheme in this embodiment, it needs to be further explained that the positive pressure arc discharge furnace also includes a movable cabinet 6, with supporting casters installed at the bottom, and the arc furnace tank 1 and the guide rail screw platform 5 are both installed on the upper end of the movable cabinet 6 to ensure the stability of the structure; a vacuum pump 7 and an argon arc welding machine 8 are installed in the movable cabinet 6, and the argon arc welding machine 8 is electrically connected to the first electrode 2 and the second electrode 3, and the vacuum pump 7 is connected to the vacuum pipe 101 through a pipeline, which is convenient for arc welding and vacuuming; an electric control unit 9 is installed on the movable cabinet 6, and the electric control unit 9 is electrically connected to the vacuum pump 7 and the argon arc welding machine 8, which is convenient for the control of the entire device through the electric control unit 9. It should be noted that if the guide rail screw platform 5 is electrically controlled, the guide rail screw platform 5 is also electrically connected to the electric control unit 9. It should be noted that, preferably, the vacuum pump 7 preferably adopts a bipolar direct-connected rotary vane vacuum pump, which has a high ultimate vacuum degree, and the vacuum degree measured at the pump port is 0.5 Pa (the vacuum degree of the furnace chamber of the load arc furnace tank body 1 is ≤10 Pa). It also has the advantages of small size, high effective pumping speed and low noise.

[0024] As a preferred implementation scheme in this embodiment, it needs to be further explained that a vacuum ball valve is installed between the vacuum pump 7 and the vacuum pipe 101 to facilitate the opening and closing of the vacuum pipe 101, and a manual high-pressure needle valve is installed on the charging and discharging pipe 102 to facilitate the opening and closing of the charging and discharging pipe 102.

[0025] As a preferred implementation scheme in this embodiment, it needs to be further explained that a cooling water jacket for cooling the arc furnace tank body 1 is installed on the outer wall of the arc furnace tank body 1, and the cooling water jacket is connected to a refrigerator 10 through a pipeline, so as to facilitate the supply of refrigerant to the cooling water jacket to prevent the arc furnace tank body 1 from overheating.

[0026] As a preferred implementation scheme in this embodiment, it needs to be further explained that the electric arc furnace tank body 1 is made of 304 stainless steel material, and the first electrode 2 and the second electrode 3 are both made of copper.

[0027] As a preferred implementation scheme in this embodiment, it needs to be further explained that the arc furnace tank body 1 is a circular cylinder with an inner diameter of 315 mm and a length of 400 mm. The cooling water jacket is a circular cylinder sealed and sleeved outside the arc furnace tank body 1 with an inner diameter of 356 mm and a length of 400 mm. The maximum design pressure of the arc furnace tank body 1 is 1.0 MPa and the maximum operating pressure is 0.8 MPa. The overall stability and pressure bearing capacity during operation are guaranteed to ensure the smooth progress of the work.

[0028] As a preferred implementation scheme in this embodiment, it needs to be further explained that an operation port for placing graphite rods 4 is provided on one side of the arc furnace tank body 1, a blind flange is connected to the operation port through a hinge, a sealing ring is provided between the blind flange and the arc furnace tank body 1, and an observation window 103 is provided in the middle of the blind flange for easy on-site observation. It should be noted that, preferably, the arc furnace tank body 1 is actually also provided with a spare air inlet, and a high-pressure needle valve is also installed at the spare air inlet.

[0029] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A positive pressure arc discharge furnace for preparing carbon nanomaterials, characterized in that: The invention comprises an electric arc furnace tank body (1), wherein a first electrode (2) and a second electrode (3) are respectively installed at both ends of the electric arc furnace tank body (1), and are used to clamp a graphite rod (4) through the cooperation of the first electrode (2) and the second electrode (3) and evaporate the graphite electrode through arc discharge; the electric arc furnace tank body (1) is provided with a vacuum evacuation pipeline (101) for evacuating the furnace chamber of the electric arc furnace tank body (1), and the electric arc furnace tank body (1) is also provided with a charging and discharging pipeline (102) for controlling the gas pressure in the furnace chamber of the electric arc furnace tank body (1); and a pressure display is installed on the electric arc furnace tank body (1).

2. A positive pressure arc discharge furnace for preparing carbon nanomaterials according to claim 1, characterized in that: The first electrode (2) is fixedly mounted on one end of the arc furnace tank (1), and the second electrode (3) is movably mounted on the other end of the arc furnace tank (1); the ends of the first electrode (2) and the second electrode (3) close to each other are both connected to conductive clamping ends, which are used to clamp the graphite rod (4) through the two conductive clamping ends; the other end of the arc furnace tank (1) is provided with a guide rail screw platform (5), which is connected to the second electrode (3) and is used to drive the second electrode (3) to approach or move away from the first electrode (2) through the guide rail screw platform (5).

3. A positive pressure arc discharge furnace for preparing carbon nanomaterials according to claim 2, characterized in that: The positive pressure arc discharge furnace also includes a movable cabinet (6), and the arc furnace tank (1) and the guide rail screw platform (5) are both installed on the upper end of the movable cabinet (6); a vacuum pump (7) and an argon arc welding machine (8) are installed in the movable cabinet (6), the argon arc welding machine (8) is electrically connected to the first electrode (2) and the second electrode (3), and the vacuum pump (7) is connected to the vacuum extraction pipeline (101) through a pipeline; an electric control unit (9) is installed on the movable cabinet (6), and the electric control unit (9) is electrically connected to the vacuum pump (7) and the argon arc welding machine (8).

4. A positive pressure arc discharge furnace for preparing carbon nanomaterials according to claim 3, characterized in that: A vacuum ball valve is installed between the vacuum pump (7) and the vacuum extraction pipeline (101), and a manual high-pressure needle valve is installed on the gas charging and discharging pipeline (102).

5. The positive pressure arc discharge furnace for preparing carbon nanomaterials according to claim 1, characterized in that: The outer wall of the arc furnace tank body (1) is provided with a cooling water jacket for cooling the arc furnace tank body (1), and the cooling water jacket is connected to a refrigerator (10) via a pipeline.

6. A positive pressure arc discharge furnace for preparing carbon nanomaterials according to claim 5, characterized in that: The electric arc furnace tank body (1) is made of 304 stainless steel material, and the first electrode (2) and the second electrode (3) are both made of red copper.

7. A positive pressure arc discharge furnace for preparing carbon nanomaterials according to claim 6, characterized in that: The electric arc furnace tank body (1) is a circular cylinder, the inner diameter of the electric arc furnace tank body (1) is 315 mm, and the length is 400 mm. The cooling water jacket is a circular cylinder sealedly sleeved on the outside of the electric arc furnace tank body (1), the inner diameter of the cooling water jacket is 356 mm, and the length is 400 mm. The maximum design pressure of the electric arc furnace tank body (1) is 1.0 MPa, and the maximum operating pressure is 0.8 MPa.

8. The positive pressure arc discharge furnace for preparing carbon nanomaterials according to claim 1, characterized in that: An operating port for placing a graphite rod (4) is provided on one side of the arc furnace tank body (1); a blind flange is connected to the operating port via a hinge; a sealing ring is provided between the blind flange and the arc furnace tank body (1); and an observation window (103) is provided in the middle of the blind flange.