Self-propagating combustion synthesis equipment with microwave-assisted heating drive

Abstract

The utility model discloses self-propagating combustion synthesis equipment with microwave auxiliary heating drive, which comprises a furnace body and a furnace cover, a reaction chamber is arranged at the lower part in the furnace body, and an electric spark igniter, a resistance heater and a microwave heater are arranged in the reaction chamber; the utility model solves the problems that the conventional self-propagating equipment is difficult to ignite high-melting-point raw materials for reaction and the heat distribution is not uniform in the reaction process; through the synergistic effect of resistance heating and microwave-assisted heating, the reaction process is more stable and efficient, the purity and performance of the product can be improved, and reliable technical support is provided for preparation of high-performance materials.

Description

Technical Field

[0001] This utility model relates to combustion synthesis equipment, specifically a self-propagating combustion synthesis equipment driven by microwave-assisted heating. Background Technology

[0002] Self-propagating combustion synthesis is a technique that utilizes the self-heating and self-conduction of the high chemical reaction heat between reactants to synthesize materials. Once the reactants are ignited, they will automatically spread to areas that have not yet reacted until the reaction is complete. This technique has significant advantages such as rapid reaction and low cost, and is one of the key processes for preparing high-performance ceramic powder materials.

[0003] However, self-propagating combustion synthesis equipment also has drawbacks. During ignition, for special materials or low-reactivity raw material systems, traditional equipment often fails to successfully ignite the reaction using conventional external ignition methods. Heat is not evenly distributed throughout the system, meaning areas far from the initial ignition point may not reach the ideal reaction temperature, thus affecting the completeness of the reaction. Furthermore, the rapid reaction rate and large temperature gradient of combustion synthesis can easily lead to defects such as high internal stress, porous morphology, and cracks in the product. This is mainly due to the uneven heat distribution during the reaction, and the difficulty of effectively controlling the temperature gradient using traditional heating methods. This significantly limits the types of materials that can be synthesized and the optimization space for their properties.

[0004] To overcome these problems, this invention provides a self-propagating combustion synthesis device driven by microwave-assisted heating. Resistance heating can increase the initial kinetic energy of the reactants, solving the drawback of conventional self-propagating devices that are difficult to ignite high-melting-point raw materials. The microwave-assisted heating device can generate microwaves of a specific frequency, causing the materials to oscillate rapidly in the microwave field with the microwave frequency, thereby generating internal frictional heat. This ensures that the heat is evenly distributed throughout the system, reduces the temperature gradient during the reaction, and improves the efficiency and success rate of combustion synthesis. Utility Model Content

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows: a self-propagating combustion synthesis device driven by microwave-assisted heating, including a furnace body and a furnace cover, wherein a reaction chamber is provided in the lower part of the furnace body, and an electric spark igniter, a resistance heater and a microwave heater are provided in the reaction chamber;

[0006] An ignition protection device is installed in the reaction chamber. The electric spark igniter is located on top of the ignition protection device and is electrically connected to an external ignition controller. The resistance heater includes a resistance heating wire evenly wound inside the ignition protection device and is electrically connected to a temperature controller and an external power supply. The microwave heater is located on the upper part of the ignition protection device.

[0007] Preferably, the furnace cover is connected to the furnace body by bolts, and the furnace cover is provided with an air inlet and an air outlet. The air inlet is connected to an external high-pressure gas supply system through an air inlet pipe, and the air outlet is connected to an exhaust pipe. The air inlet pipe is also provided with a pressure regulating valve and a pressure sensor.

[0008] Preferably, the ignition protection device includes a protective layer disposed on the inner wall of the reaction chamber and a heating platform disposed on top of the protective layer and supporting the electric spark igniter.

[0009] Preferably, the reaction chamber on the upper part of the heating platform is provided with an air filling valve and an air extraction valve on its two sides respectively.

[0010] Preferably, the reaction chamber on the upper part of the heating platform has an observation chamber on one side facing outward, and an observation window is provided at the outer end of the observation chamber.

[0011] Preferably, a sealing ring is provided at the connection between the furnace cover and the furnace body.

[0012] The advantages of this invention compared to existing technologies are as follows: This invention solves the problem that conventional self-propagating equipment is difficult to ignite high-melting-point raw material reactions and that the heat distribution during the reaction process is uneven; the synergistic effect of resistance heating and microwave-assisted heating makes the reaction process more stable and efficient, which helps to improve the purity and performance of the product and provides reliable technical support for the preparation of high-performance materials. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of a self-propagating combustion synthesis device driven by microwave-assisted heating according to this utility model.

[0014] Figure 2 This is a schematic diagram of the internal structure of a self-propagating combustion synthesis device driven by microwave-assisted heating according to this utility model. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0016] In the description of the embodiments of this utility model, it should be noted that if terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," or "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, terms such as "first," "second," and "third" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0017] Furthermore, the use of terms such as "horizontal," "vertical," and "sag" does not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0018] In the description of the embodiments of this utility model, "a plurality of" means at least two.

[0019] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0020] Example:

[0021] A self-propagating combustion synthesis device driven by microwave-assisted heating includes a furnace body 1 and a furnace cover 2. A sealing ring is provided at the connection between the furnace cover 2 and the furnace body 1. A reaction chamber 3 is provided in the lower part of the furnace body 1. An electric spark igniter 4, a resistance heater 5 and a microwave heater 6 are provided in the reaction chamber 3.

[0022] An ignition protection device 7 is installed inside the reaction chamber 3. An electric spark igniter 4 is located on top of the ignition protection device 7 and is electrically connected to an external ignition controller. An ignition electrode 401, made of metal, is installed in the electric spark igniter 4. The resistance heater 5 includes a resistance heating wire 501 uniformly wound inside the ignition protection device 7 and is electrically connected to a temperature controller and an external power supply. A microwave heater 6 is installed within the ignition protection device. 7. Upper part; The furnace cover 2 is connected to the furnace body 1 by bolts 8. The furnace cover 2 is provided with an air inlet 9 and an air outlet 10. The air inlet 9 is connected to an external high-pressure gas supply system through an air inlet pipe. The air outlet 10 is connected to an exhaust pipe 11. The air inlet pipe 11 is also provided with a pressure regulating valve 12 and a pressure sensor 13. The ignition protection device 7 includes a protective layer 701 provided on the inner wall of the reaction chamber 3 and a heating platform 702 provided on the top of the protective layer 701 and supporting the electric spark igniter 4.

[0023] The reaction chamber 3 on the upper part of the heating platform 702 is provided with an air filling valve 14 and an air extraction valve 15 on its two sides respectively. An observation chamber 16 is provided on one side of the reaction chamber 3 on the upper part of the heating platform 702, and an observation window 17 is provided at the outer end of the observation chamber 16.

[0024] In this embodiment, the reaction chamber is made of high-strength, high-temperature resistant and high-pressure resistant alloy steel. The top of the chamber is equipped with a cover with good sealing performance. The cover is equipped with an air inlet for introducing high-pressure gas and an exhaust port for discharging the gas generated during the reaction. The air inlet is connected to a high-pressure gas supply system through a high-pressure pipeline, and a pressure regulating valve and a pressure sensor are installed on the pipeline to accurately regulate and monitor the gas pressure introduced into the reaction container.

[0025] In this embodiment, the electric spark igniter is connected to an external ignition controller for precise control of ignition time and ignition energy. The ignition electrode of the electric spark igniter is made of a high-melting-point, oxidation-resistant metal material to ensure direct ignition under high temperature and high pressure conditions, igniting the reactants and initiating a self-propagating combustion synthesis reaction. In this embodiment, molybdenum wire ignition is used. At the same time, a protective device is provided around the ignition device to prevent damage to the ignition electrode due to material splashing or high-pressure gas impact during the ignition process, ensuring the stability and safety of the ignition process.

[0026] In this embodiment, the resistance heating wire is a high-resistance, high-temperature resistant alloy heating wire. The heating wire is evenly arranged around the reaction chamber, which can quickly heat up to the required temperature and help start the self-propagating combustion reaction. The resistance heating wire is connected to an external power supply and temperature controller. The temperature controller can accurately control the heating power of the resistance heating wire, effectively improving the problem of insufficient starting temperature in traditional self-propagating combustion synthesis devices.

[0027] The microwave heater is placed at the top of the reaction chamber, which can effectively reduce the temperature gradient field, avoid local overheating or overcooling, maintain the reaction heat evenly distributed throughout the system until the reaction is complete, ensure the reaction proceeds smoothly, and reduce product defects caused by uneven temperature.

[0028] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A self-propagating combustion synthesis apparatus having a microwave-assisted heating drive, characterized by, It includes a furnace body and a furnace cover. A reaction chamber is provided in the lower part of the furnace body. An electric spark igniter, a resistance heater and a microwave heater are provided in the reaction chamber. An ignition protection device is installed in the reaction chamber. An electric spark igniter is located on top of the ignition protection device and is electrically connected to an external ignition controller. An ignition electrode is provided in the electric spark igniter, and the ignition electrode is made of metal. The resistance heater includes a resistance heating wire evenly wound inside the ignition protection device and is electrically connected to a temperature controller and an external power supply. The microwave heater is located on the upper part of the ignition protection device.

2. A self-propagating combustion synthesis apparatus with microwave-assisted heating drive according to claim 1, characterized in that, The furnace cover is connected to the furnace body by bolts. The furnace cover is provided with an air inlet and an air outlet. The air inlet is connected to an external high-pressure gas supply system through an air inlet pipe. The air outlet is connected to an exhaust pipe. The air inlet pipe is also provided with a pressure regulating valve and a pressure sensor.

3. The apparatus for self-propagating combustion synthesis driven by microwave-assisted heating according to claim 1, wherein, The ignition protection device includes a protective layer installed on the inner wall of the reaction chamber and a heating platform installed on top of the protective layer to support the electric spark igniter.

4. A self-propagating combustion synthesis apparatus with microwave-assisted heating drive according to claim 3, characterized in that, The reaction chamber on the upper part of the heating platform is equipped with an air filling valve and an air extraction valve on its two sides respectively.

5. A self-propagating combustion synthesis apparatus with microwave-assisted heating drive according to claim 4, characterized in that, The reaction chamber on the upper part of the heating platform has an observation chamber on one side facing outwards, and an observation window is provided at the outer end of the observation chamber.

6. The apparatus for self-propagating combustion synthesis with microwave assisted heating drive according to claim 1, wherein, A sealing ring is provided at the connection between the furnace cover and the furnace body.

Images