CN113340110A - Novel resistance type ultrafast temperature-changing heating furnace and use method thereof - Google Patents
Novel resistance type ultrafast temperature-changing heating furnace and use method thereof Download PDFInfo
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- CN113340110A CN113340110A CN202110618466.8A CN202110618466A CN113340110A CN 113340110 A CN113340110 A CN 113340110A CN 202110618466 A CN202110618466 A CN 202110618466A CN 113340110 A CN113340110 A CN 113340110A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B17/00—Furnaces of a kind not covered by any preceding group
- F27B17/02—Furnaces of a kind not covered by any preceding group specially designed for laboratory use
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D11/00—Arrangement of elements for electric heating in or on furnaces
- F27D11/02—Ohmic resistance heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
- F27D21/0014—Devices for monitoring temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
- F27D21/02—Observation or illuminating devices
Abstract
The invention discloses a novel resistance type ultrafast variable temperature heating furnace and a using method thereof, belonging to the field of energy-saving materials and equipment. The invention firstly uses a nano carbon-based electrothermal film to manufacture a resistance type heating body, then the resistance type heating body is fixed in a heating area in a furnace cavity through a fixture such as tungsten metal or insulating high-temperature-resistant ceramics, and the resistance type heating body is combined with a stainless steel furnace body to obtain the ultra-fast heating furnace. The heating furnace is characterized in that under the vacuum or inert atmosphere environment of the furnace body, the Joule heat generated by the resistor can be different by controlling the input electric power, so that the accurate and rapid temperature control is realized, and the ultrafast temperature-changing resistance-type heating furnace is obtained. The temperature change rate of the carbon-based resistor in the furnace can reach more than 1000 ℃/s, and the highest temperature can reach 3000 ℃. Compared with the heating mode of the traditional external heating source (such as a muffle furnace), the ultra-fast temperature-changing heating furnace has the advantages of faster temperature changing, better temperature controllability and more uniform heating, and meanwhile, the power consumption of the ultra-fast temperature-changing heating furnace is far less than that of the traditional heating equipment, so that the ultra-fast temperature-changing heating furnace has important application prospect.
Description
Technical Field
The invention belongs to the field of energy-saving materials and equipment, and particularly relates to a design and a use method of a novel resistance type ultrafast temperature-changing heating furnace.
Background
In modern industrial production and experimental research, the requirement for realizing rapid heating and rapidly reaching higher temperature is very common, so that materials and equipment capable of rapidly heating to higher temperature in a short time by electric heating are widely required. The carbon-based electrothermal film such as the carbon nano tube has the advantages of quick electrothermal response, wide temperature range, low input voltage and the like, can be quickly heated to a high temperature of more than 1000 ℃ in a short time, and has wide application prospect in the field of energy-saving materials and equipment.
At present, the traditional materials for generating joule heat, such as metal (alloy) wires, metal oxides, graphite rods, silicon-molybdenum rods and the like, are generally applied to resistance-type heating bodies in various high-temperature furnaces, and play a great role in industrial production. However, these conventional resistive heat source devices are generally large in size and weight, high in voltage and energy consumption required during operation, and generally low in temperature rise and drop rate (<100 ℃/min), and for example, a common muffle furnace is a resistance furnace in which resistance wires in the furnace are electrified to generate joule heat as a heat source. In view of the current market situation, most of resistance wires used in muffle furnaces are iron-nickel alloy resistance wires, the temperature rising and lowering speed is about 25 ℃/min or lower, the highest temperature is not more than 100 ℃/min, the long-term working temperature is less than 1400 ℃, the efficiency is relatively low, the energy consumption is high, and the resistance wires are obviously not advantageous when used in some machining processes requiring rapid heating/cooling.
Recently developed new joule heating materials such as metal nanowires (Screen-printed, low-cost, and patterned flexible)e heater based on ag fractal dendrites for human wearable application, Advanced Materials Technology4 (2018) 1800453), carbon-based nano-material such as carbon nanotube/graphene (arm-shaped electrothermal actuator based on super-ordered carbon nanotube/polymer composite material, novel carbon material (32 (2017) 411-418), conductive polymer such as polythiophene derivative PEDOT (soluble display based on a stable electroactive polymer and a stable dielectric coating electrically conductive, ACS Applied Materials)&Interfaces 10 (2018) 24807-24815), and some emerging two-dimensional conductive materials such as MXene (MXene-recovered cellulose nanofiber inks for 3D-printed smart fibers and textils,Advanced Functional Materials29 (2019) 1905898), the joule heat generated in the electrified state is widely applied to the fields of deicing and defogging, transparent conversion, fabric warm keeping, resin curing, driving devices, biological physiotherapy, luminous display and the like. However, most of the studies on joule heat of these new heat sources are focused on the low temperature region below 200 ℃ at present, and one of the reasons is that the materials themselves or the guest components in contact with the materials have low temperature resistance; at 1000 deg.C or even above 2000 deg.C, most materials will be destroyed and the electric heating function will be lost. Conventional metal nanowires such as silver and copper, and conductive polymer-based electrothermal materials are resistant to temperature of not more than 1000 ℃ even in an inert atmosphere. In industrial production and experimental research, the requirement of rapid heating and rapid reaching of higher temperature is very common. Therefore, materials and applications having excellent electrothermal properties, such as fast electrothermal response, wide temperature range, low input voltage, and the like, and capable of rapidly heating to a temperature of 1000 ℃ or higher within a short time are very important.
Disclosure of Invention
The invention discloses a design of a novel resistance type ultrafast variable temperature heating furnace, which has the characteristics of quick electric heating response, wide temperature range, low input voltage and the like, and makes up the vacancy of the products in the existing market.
In order to achieve the above object, the present invention provides the following technical solutions:
a novel resistance type ultra-fast temperature-changing heating furnace is characterized in that a resistance heating body in the heating furnace is made of a macroscopic electrothermal film of carbon nano tubes, graphene, carbon nano-fibers or MXene and other carbon nano-materials with extremely high electrothermal temperature response rate and extremely high tolerance temperature in vacuum or inert atmosphere, the macroscopic electrothermal film is fixed in a heating area in a cavity through high-temperature-resistant fixtures such as insulating ceramics and tungsten metal, and the macroscopic electrothermal film is assembled with a cabin cover provided with a temperature measurement window and a stainless steel furnace body to obtain the vacuum ultra-fast heating furnace.
The use method of the novel resistance-based ultra-fast temperature-changing heating furnace comprises the following steps:
(a) installing a nano carbon-based resistor: putting the nano carbon-based macro resistor into a furnace, so that the middle area of the furnace body is surrounded by the nano carbon resistor to form a heating area; the resistor is fixed on the bracket through the high-temperature-resistant clamp and is connected with the electrode, and meanwhile, the appearance of the resistor can be designed according to requirements;
(b) changing the atmosphere environment in the furnace body: removing air in the furnace, and keeping the atmosphere in the furnace from damaging the resistor and the furnace body material at high temperature;
(c) inputting external power supply: connecting a power supply outside the furnace body by using a lead, and heating a resistor in the furnace by inputting voltage or current;
(d) collecting temperature data: temperature data collection can be performed at the temperature measurement window by an infrared probe.
The nanocarbon-based resistor in step (a) is not limited to a specific material, and may be one or a combination of carbon nanotubes, graphene, nanocarbon fibers, MXene, and the like.
Wherein, inert atmosphere such as argon, nitrogen and the like can be introduced into the furnace in the step (b); the vacuum may be evacuated to maintain a vacuum state.
Wherein, the voltage and current in step (c) can be adjusted at any time to meet the required temperature requirement.
Wherein, the infrared temperature measuring probe in the step (d) can select different infrared wave bands to accurately measure the temperature values of different temperature areas and different time periods.
As a preferred technical scheme, the specific steps of the step (a) are as follows: cutting a carbon nanotube film of 30 x 20cm by a blade, placing the carbon nanotube film in a furnace, fixing the carbon nanotube film by a clamp, and connecting an electrode device. The temperature in the furnace body can reach 1500 ℃ within 2 seconds by inputting the rated voltage of 10V and measuring with an infrared temperature measuring probe.
As a preferred technical scheme, the specific steps of the step (a) are as follows: cutting 20X 10cm carbon fiber film with a blade, placing in a furnace body, fixing with a clamp, and connecting with an electrode device. By inputting the rated voltage of 8V, the temperature in the cabin body can reach 1300 ℃ within 2 seconds by using an infrared temperature measuring probe.
The beneficial technical effects which can be realized by the invention at least comprise: the invention discloses a design of a novel resistance type ultrafast temperature-changing heating furnace, and belongs to the field of energy-saving materials and equipment. The invention firstly uses carbon-based material to make resistance heating element, then fixes the resistance heating element in the heating zone in the furnace body by the fixture of tungsten metal or high temperature resistant ceramics, and assembles with the stainless steel furnace body to obtain the ultra-fast temperature changing heating furnace. The heating furnace has the outstanding characteristics of quick electric heating response, wide temperature range, low input voltage and the like, and can quickly heat up to more than 1000 ℃ in a short time. Therefore, the method provides a low-cost and high-performance choice for realizing rapid heating and rapidly meeting the requirements of equipment with higher temperature in modern industrial production and experimental research. The invention utilizes the advantages of quick electric heating response and wide temperature range of the macroscopic assembly body of the nano carbon material, realizes a novel ultra-quick temperature-changing joule heating mode, and has important application prospect.
Drawings
FIG. 1 is a schematic view showing an external structure of an electric heating furnace according to the present invention.
FIG. 2 is a schematic view of the internal heating zone of the electric heating furnace according to the present invention.
FIG. 3 is a graph showing the high temperature electrothermal response data of the electrothermal furnace of the present invention in a vacuum environment.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to the implementation examples and the accompanying drawings. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Examples 1
A novel resistance type ultra-fast temperature-changing heating furnace can quickly change the temperature in the furnace body by inputting different voltages or currents in an inert atmosphere or a vacuum state, so as to reach the required test temperature and then synthesize the required material.
A use method of a novel resistance type ultrafast temperature-changing heating furnace for preparing copper metal-coated carbon nanofiber fine wires at high temperature specifically comprises the following steps:
firstly, cutting a thin line consisting of 4 cm-long carbon nanofibers by using a blade, depositing copper metal on the thin line by using electrochemical deposition, then putting the thin line into a resistance-type ultra-fast temperature-changing heating furnace, inputting 10V rated voltage to the composite carbon nanofiber line in nitrogen atmosphere, rapidly raising the monitoring temperature to 1100 ℃ in about 1 second, and after preserving the temperature for 2 minutes, completely melting the copper metal into the carbon fibers and completely coating the copper metal on the surfaces of the fibers. Then, the power supply is cut off, and the copper metal-coated carbon nanofiber thin wire can be obtained.
EXAMPLES example 2
A novel resistance type ultra-fast temperature-changing heating furnace can quickly change the temperature in the furnace body by inputting different voltages or currents in an inert atmosphere or a vacuum state, so as to reach the required test temperature and then synthesize the required material.
A use method of a novel resistance type ultrafast temperature-changing heating furnace for preparing silicon carbide fibers specifically comprises the following steps:
firstly, a certain amount of silicon powder and carbon powder are weighed and mixed for grinding, then the mixture is uniformly coated on the surface of a graphene film, and is twisted into fibers, and then the fibers are placed into a heating furnace. Inputting a rated voltage of 15V to the composite fiber under the argon atmosphere, monitoring the temperature, rapidly raising the temperature to 1350 ℃ in about 2 seconds, and preserving the temperature for 3 minutes to enable the silicon powder and the carbon powder to react to produce the silicon carbide. Then the power supply is cut off to obtain the required silicon carbide fiber.
EXAMPLE 3
A novel resistance type ultra-fast temperature-changing heating furnace can quickly change the temperature in the furnace body by inputting different voltages or currents in an inert atmosphere or a vacuum state, so as to reach the required test temperature and then synthesize the required material.
A use method for preparing a tungsten carbide film by using a novel resistance type ultrafast temperature-changing heating furnace specifically comprises the following steps:
firstly, weighing a certain amount of nano tungsten powder, uniformly dispersing and filtering the nano tungsten powder to the surface of the carbon nano tube film, and then putting the nano tungsten powder into the heating furnace. At 10-4Inputting 20V rated voltage to the composite film under Pa vacuum state, monitoring temperature, rapidly heating to 1600 ℃ in about 1 second, and keeping the temperature for 2 minutes to enable tungsten powder and the carbon nano tube substrate to react to produce tungsten carbide. Then, the power supply is cut off to obtain the required tungsten carbide film.
Compared with other heating furnaces, the novel resistance type ultrafast variable temperature heating furnace utilizes the principle of joule heating and self-heating, can quickly respond in a short time and reach the required temperature; while also being able to be lowered to the initial or desired temperature in a short period of time. The purpose can be realized only by controlling the size of the input electric work. Compared with the traditional heating modes such as a muffle furnace and the like, the heating method of the novel resistance type ultra-fast variable temperature heating furnace has the characteristics of extremely high temperature rising/reducing speed and adjustable heat preservation time at any time, and can greatly reduce energy consumption.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The utility model provides a novel resistance-type ultra-fast alternating temperature heating furnace which characterized in that: comprises a furnace chamber (1), an electric connection electrode (2), a vacuum gauge interface (3), a vacuum pump interface (4), a deflation valve (5), a lofting/sampling cabin door (6) and a temperature measurement window (7); the furnace body inner part mainly contains: the electrode column (8), the resistor (9) and the sample table (10), all parts in the furnace body have good high temperature resistance, and the furnace body has high sealing performance.
2. The novel resistance type ultra-fast temperature-changing heating furnace according to claim 1, characterized in that: the resistance heating element is prepared from a macroscopic assembly body of a nano carbon material which has extremely high electrothermal temperature response rate (> 1000 ℃/s) and extremely high tolerance temperature (-3000 ℃) in vacuum or inert atmosphere.
3. The novel resistance type ultra-fast temperature-changing heating furnace according to claim 1, characterized in that: each part in the furnace cavity can be made of high-temperature resistant materials such as insulating ceramics, tungsten metal and the like, and the furnace body has high sealing performance.
4. The novel resistance type ultra-fast temperature-changing heating furnace according to claim 1, characterized in that: the temperature measurement window is made of infrared transparent glass material, such as high-purity silica, ZnSe, ZnS, MgF, sapphire (Al)2O3) Etc., which can macroscopically observe the condition of a heated object during heating and realize accurate temperature measurement using an infrared thermometer.
5. The novel resistance type ultra-fast temperature-changing heating furnace according to claim 1, characterized in that: the anti-radiation coating can be added on the inner wall side of the heating furnace or a cooling device can be added on the furnace wall according to requirements.
6. The use method of the novel resistance-based ultra-fast temperature-changing heating furnace according to claim 1, characterized by comprising the following steps:
(a) installing a nano carbon-based resistor: putting the nano carbon-based macro resistor into a furnace, so that the middle area of the furnace body is surrounded by the nano carbon resistor to form a heating area; the resistor is fixed on the bracket through the high-temperature-resistant clamp and is connected with the electrode, and meanwhile, the appearance of the resistor can be designed according to requirements;
(b) changing the atmosphere environment in the furnace body: removing air in the furnace, and keeping the atmosphere in the furnace from damaging the resistor and the furnace body material at high temperature;
(c) inputting external power supply: connecting a power supply outside the furnace body by using a lead, and heating a resistor in the furnace by inputting voltage or current;
(d) collecting temperature data: temperature data collection can be performed at the temperature measurement window by an infrared probe.
7. The use method of the novel resistance type ultra-fast temperature-changing heating furnace according to claim 6, characterized in that: the nanocarbon-based resistor in step (a) is not limited to a specific material, and may be one or a combination of carbon nanotubes, graphene, nanocarbon fibers, MXene, and the like.
8. The use method of the novel resistance type ultra-fast temperature-changing heating furnace according to claim 6, characterized in that: inert atmosphere such as argon, nitrogen and the like can be introduced into the furnace in the step (b); the vacuum may be evacuated to maintain a vacuum state.
9. The use method of the novel resistance type ultra-fast temperature-changing heating furnace according to claim 6, characterized in that: the voltage and current in step (c) can be adjusted at any time to meet the required temperature requirement.
10. The use method of the novel resistance type ultra-fast temperature-changing heating furnace according to claim 6, characterized in that: the infrared temperature measuring probe in the step (d) can select different infrared wave bands to accurately measure temperature values in different temperature areas and different time periods.
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Cited By (3)
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| CN114455586A (en) * | 2022-02-22 | 2022-05-10 | 合肥工业大学 | W-shaped steel plate2Rapid preparation method of C nanoparticles |
| CN115178740A (en) * | 2022-08-22 | 2022-10-14 | 合肥工业大学 | Tungsten-copper functionally gradient material and preparation method thereof |
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Application publication date: 20210903 |