Self-propagating high-temperature synthesis equipment with preheating driving function

Abstract

The utility model discloses self-propagating high-temperature synthesis equipment with preheating driving, which comprises a furnace body and a furnace cover, and an induction coil heater, a resistance heater and a forward pressure driving device are arranged in the furnace body; the induction coil heater, the resistance heater and an external power supply form a loop; according to the self-propagating high-temperature synthesis equipment, complete reaction of combustion synthesis reaction can be effectively promoted, the combustion temperature gradient is remarkably reduced through the self-propagating high-temperature synthesis equipment combining resistance preheating, induction heating and forward high-pressure driving, and the defects of large product stress, insufficient compactness and the like are overcome. Meanwhile, the sintering activity and purity of the product are improved, and the high efficiency of combustion synthesis reaction is promoted.

Description

TECHNICAL FIELD

[0001] The utility model relates to a self-propagating high-temperature synthesis equipment, in particular to a self-propagating high-temperature synthesis equipment with preheating driving. BACKGROUND

[0002] Self-propagating synthesis technology is a kind of technology using the large amount of chemical heat generated by chemical reaction itself and the heat that can self-heat and conduct to maintain the reaction can continue to carry out.This instantaneous high-temperature in-situ synthesis method avoids the pollution of the surface of particles, improves the structural characteristics of the interface between particles, makes the phase interface clean, can obtain high-purity product, and because of high temperature gradient in the reaction process, high concentration of defects and some non-equilibrium structures exist in the product, so the synthesis product has the characteristics of high sintering activity, easy to sinter.

[0003] However, the previous self-propagating equipment often has some shortcomings. In terms of ignition, first, the previous equipment has the shortcomings of incomplete reaction, difficult to ignite and the like when processing some high-melting-point raw materials, especially when processing Ta-based substances such as tantalum boride (TaB2), tantalum carbide (TaC), tantalum silicide (TaSi2) and the like. Secondly, due to the shortcomings of too fast combustion synthesis reaction process and too large combustion temperature gradient, the synthesized product often has problems such as large internal stress, loose appearance, cracks and the like. These seriously limit the purity and performance improvement space of the material synthesis. In terms of furnace pressure, the traditional equipment usually ignites in a normal-pressure protective gas environment, and for the reaction system that needs high pressure to obtain high yield, the traditional equipment is difficult to flexibly construct the required high-pressure reaction environment according to the specific needs of material synthesis, which also seriously limits the completeness of the combustion synthesis reaction.

[0004] To solve the above problems, the present application provides a self-propagating synthesis device with resistance preheating, induction coil heating and positive high-pressure driving. Resistance preheating can improve the initial kinetic energy of the reactant, reduce the reaction activation energy barrier, and assist induction coil heating to maintain uniform heat distribution in the whole system during the reaction process, ensuring the continuous and stable progress of the reaction. The positive high-pressure driving device introduces high-pressure inert gas or reaction-required gas to increase the pressure of the reaction system, greatly increase the collision frequency and rate between molecules and atoms, further promote the reaction rate, and improve the efficiency and success rate of combustion synthesis. UTILITY MODEL CONTENT

[0005] To solve the above technical problems, the technical scheme provided by the utility model is: a self-propagating high-temperature synthesis equipment with preheating driving, comprising a furnace body and a furnace cover, the furnace body is provided with an induction coil heater, a resistance heater and a positive pressure driving device; the induction coil heater and the resistance heater form a loop with an external power supply;

[0006] The resistance heater comprises a heat-conducting rod arranged at the bottom of the furnace body, an electric resistance coil arranged outside the heat-conducting rod, and a sample table arranged at the top of the electric resistance coil, and a lighting device arranged at the top of the sample table.

[0007] A lighting device protection sleeve is arranged outside the lighting device, a protection top plate is arranged at the top of the lighting device protection sleeve, and the induction coil heater comprises an induction coil arranged outside the lighting device protection sleeve.

[0008] The forward pressure driving device comprises an air inlet hole, an air outlet hole, a forward pressure air inlet hole and a vacuum breaking hole arranged at the side wall of the furnace body and communicated with the inside of the furnace body, and the bottom of the lighting device protection sleeve is provided with an air hole.

[0009] Preferably, the lighting device is provided with a lighting electrode, and the lighting electrode is made of metal.

[0010] Preferably, the electric resistance coil is uniformly wound outside the heat-conducting rod.

[0011] Preferably, the induction coil is uniformly wound outside the lighting device protection sleeve.

[0012] Preferably, an observation window is arranged on the side wall of the furnace body.

[0013] Preferably, the furnace cover is connected with the furnace body through bolts, and a sealing ring is arranged at the connection between the furnace cover and the furnace body.

[0014] Compared with the prior art, the self-propagating high-temperature synthesis equipment with preheating driving of the utility model can effectively promote the complete reaction of the combustion synthesis reaction, the self-propagating high-temperature synthesis equipment combining resistance preheating, induction heating and forward high-pressure driving significantly reduces the combustion temperature gradient, reduces the product stress and the lack of compactness and other shortcomings, and improves the sintering activity and purity of the product and promotes the efficiency of the combustion synthesis reaction. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a structural schematic view of the self-propagating high-temperature synthesis equipment with preheating driving of the utility model. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all the embodiments. The components of the embodiments of the utility model described and shown in the drawings can be arranged and designed in various different configurations.

[0017] In the description of the embodiments of the utility model, it needs to be explained that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship when the utility model product is usually placed, only for the convenience of describing the utility model and simplifying the description, and not indicating or implying that the indicated device or element must have a specific orientation, structure and operation, therefore, it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" and the like are only used for distinguishing description, and cannot be understood as indicating or implying relative importance.

[0018] In addition, if the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only 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 inclined.

[0019] In the description of the embodiments of the utility model, "multiple" represents at least 2.

[0020] In the description of the embodiments of the utility model, it also needs to be explained that, unless otherwise explicitly specified and limited, if the terms "set", "install", "connect", "connect" appear, it should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0021] Embodiment:

[0022] A self-propagating high-temperature synthesis equipment with preheating drive, comprising a furnace body 1 and a furnace cover 2, the furnace body 1 is provided with an induction coil 301 heater 3, a resistance heater 4 and a forward pressure driving device 5, the induction coil heater 3, the resistance heater 4 are all connected with external power supply to form a loop,

[0023] The resistance heater 4 includes a heat conduction rod 401 arranged at the bottom of the furnace body 1, an electric resistance coil 402 is arranged outside the heat conduction rod 401, a sample table 6 is arranged at the top of the electric resistance coil 402, and an ignition device 7 is arranged at the top of the sample table 6;

[0024] The ignition device 7 is provided with an ignition device protection sleeve 8 outside, the ignition device protection sleeve 8 is provided with a protection top plate 801 at the top, and the induction coil 301 heater 3 includes an induction coil 301 arranged outside the ignition device protection sleeve 8.

[0025] The positive pressure driving device 5 comprises an air inlet hole 501, an air outlet hole 502, a positive pressure air inlet hole 503 and a vacuum breaking hole 504 arranged on the side wall of the furnace body 1 and communicated inside the furnace body 1; the bottom of the ignition device protection sleeve 8 is provided with an air hole 802.

[0026] The ignition device 7 is provided with an ignition electrode 701 made of metal.

[0027] The resistance coil 402 is uniformly wound outside the heat conducting rod 401.

[0028] The induction coil 301 is uniformly wound outside the ignition device protection sleeve 8.

[0029] The side wall of the furnace body 1 is provided with an observation window.

[0030] The furnace cover 2 is connected with the furnace body 1 through bolts, and a sealing ring is arranged at the connection between the furnace cover 2 and the furnace body 1.

[0031] In the embodiment, the furnace body is made of high-strength alloy, has good corrosion resistance and high-pressure resistance, and the real-time combustion condition in the furnace can be clearly observed through the observation window; the furnace cover is provided with a sealing ring to ensure the sealing property of the combustion chamber; the furnace body is provided with an air outlet valve to extract the internal gas and create a good vacuum environment; after vacuumizing, the introduction of protective gas through the air inlet hole can ensure that the furnace is filled with a protective atmosphere; the function of the positive pressure driving device is to increase the internal pressure of the furnace by introducing high-pressure inert gas or reaction-required gas before combustion synthesis, and the pressure serves as the driving force of the chemical reaction, so that the atoms in the reaction system are more dense, the collision frequency and rate between molecules and atoms during combustion are increased, and thus the combustion synthesis reaction is promoted to be completely performed.

[0032] When the material is put on the sample heating table, the preheating temperature is controlled by adjusting the current of the resistance coil under the inert atmosphere, the heat generated by the resistance coil is uniformly transmitted to the material through the heat conduction rod, so that the material is fully preheated, the temperature gradient before the combustion synthesis is reduced, and the thermal stress inside the material before the combustion can be reduced; secondly, the forward pressure inlet hole is connected with the external high-pressure gas source, and the forward pressure inlet hole is used for providing forward pressure driving for the combustion synthesis; after the material preheating and the forward inert gas pressure size adjustment, the resistance preheating device is closed, and then the material is inductively heated by changing the current in the induction coil; according to the electromagnetic induction principle, when the alternating current passes through the induction coil, the alternating magnetic field is generated around the induction coil, and the eddy current is generated in the material; the eddy current causes the material to heat up and heat up, so as to realize the heating effect of the material, until the material occurs combustion synthesis reaction; when the self-propagating combustion synthesis reaction is completed, the forward high-pressure driving device and the induction heating device are closed; the exhaust valve is opened, the exhaust gas in the furnace is discharged, after the reaction container is cooled to room temperature, the furnace cover is opened, and the reaction product is taken out.

[0033] The above describes the utility model and its implementation mode, and this description is not restrictive, and the embodiment shown in the drawings is only one of the utility model, and the actual structure is not limited thereto. In summary, if a person skilled in the art is inspired, without departing from the creative purpose of the utility model, without creative design, similar structure mode and examples of the technical scheme should belong to the protection scope of the utility model.

Claims

1. A self-propagating high-temperature synthesis apparatus having a preheating drive, characterized by, The furnace body and the furnace cover are provided with an induction coil heater, an electric resistance heater and a positive pressure driving device; the induction coil heater and the electric resistance heater form a loop with an external power supply; The electric resistance heater comprises a heat conduction rod arranged at the bottom of the furnace body, an electric resistance coil arranged outside the heat conduction rod, a sample table arranged at the top of the electric resistance coil, and an ignition device arranged at the top of the sample table; An ignition device protection sleeve is arranged outside the ignition device, and a protection top plate is arranged at the top of the ignition device protection sleeve; the induction coil heater comprises an induction coil arranged outside the ignition device protection sleeve; The positive pressure driving device comprises an air inlet hole, an air outlet hole, a positive pressure air inlet hole and a vacuum breaking hole arranged at the side wall of the furnace body and communicated with the inside of the furnace body; and an air hole is arranged at the bottom of the ignition device protection sleeve.

2. A self-propagating high-temperature synthesis apparatus having a preheating drive according to claim 1, characterized in that, The ignition device is provided with an ignition electrode made of metal.

3. A self-propagating high-temperature synthesis apparatus having a preheating drive according to claim 1, characterized in that, The electric resistance coil is uniformly wound outside the heat conduction rod.

4. A self-propagating high-temperature synthesis apparatus having a preheating drive according to claim 1, characterized in that, The induction coil is uniformly wound outside the ignition device protection sleeve.

5. A self-propagating high-temperature synthesis apparatus having a preheating drive according to claim 1, characterized in that, An observation window is arranged on the side wall of the furnace body.

6. A self-propagating high-temperature synthesis apparatus having a preheating drive according to claim 1, characterized in that, The furnace cover is connected with the furnace body by bolts, and a sealing ring is arranged at the connection between the furnace cover and the furnace body.

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