A microwave sintering furnace

Abstract

The present invention provides a microwave sintering furnace, which relates to the field of microwave heating technology. The microwave sintering furnace includes a furnace body and multiple microwave generators; a sintering chamber for storing samples is formed within the furnace body; the multiple microwave generators are disposed within the furnace body and distributed around the furnace body; wherein the feed ports of the multiple microwave generators are all oriented toward the sintering chamber, and the microwave feed paths of the multiple feed ports intersect with the sintering chamber, for sintering the samples in the sintering chamber. The microwave sintering furnace provided by the present invention, when sintering samples of lithium-ion battery positive electrode materials, enables the formation of more microscopic subgrain boundaries in the material, thereby significantly improving the material's physical properties.

Description

Technical Field

[0001] The present invention relates to the technical field of microwave heating, in particular to a microwave sintering furnace. Background Art

[0002] Existing microwave heating furnaces mainly utilize the characteristics of microwave heating for materials with high dielectric constant and large loss coefficient, such as fast heating speed, small heat loss, and the ability to achieve strong field and high temperature.

[0003] Materials that undergo a transition from a cubic system to a less symmetrical system during the preparation of positive electrode materials for lithium-ion batteries. For example, the space groups of LiCoO2, Li(Co0.5Ni0.3Mn0.2)O2, Li(Co0.33Ni0.33Mn0.33)O2 in positive electrode materials for lithium-ion batteries, as well as the high nickel positive electrode materials that are currently being studied, are all R-3m, belonging to rhombohedral lattice crystals. The atomic positions of these special crystals are very similar to those of face-centered cubic NaCl, except that when the cobalt and lithium ions in LiCoO2 occupy the same positions as the sodium ions in NaCl, a transition occurs along a certain axis. <111> The layered order makes the

[111] direction of the cobalt-lithium order different from the other three directions of the cubic crystal. <111> The symmetry of the cubic system is lost and the crystal transforms into a rhombohedral lattice. In the process of transformation from cubic system to rhombohedral lattice, it is easy for the rhombohedral crystals to form the same orientation domains as those in the cubic system.

[0004] Existing microwave heating furnaces only use microwave generators as the energy source of the furnace to achieve material heating. When heating lithium-ion battery positive electrode materials, existing microwave heating furnaces generally cannot cause the cubic crystal mother phase to form more orientation domains during the transformation process to a phase with lower symmetry, and thus cannot effectively change the physical properties of the lithium-ion battery positive electrode materials that can be affected by subgrain boundaries. Summary of the Invention

[0005] In order to overcome the deficiencies in the prior art, the present application provides a microwave sintering furnace to solve the technical problem in the prior art that the microwave heating furnace has defects and cannot effectively promote the formation of more subgrain boundaries in the lithium-ion battery positive electrode material when heating the lithium-ion battery positive electrode material, thereby failing to change the physical properties of the material.

[0006] To achieve the above-mentioned purpose, the present application provides a microwave sintering furnace, comprising a furnace body and a plurality of microwave generators;

[0007] A sintering chamber for storing samples is formed in the furnace body;

[0008] The plurality of microwave generators are all disposed in the furnace body and distributed around the furnace body;

[0009] The feed ports of the microwave generators are all oriented toward the sintering chamber, and the feed ports are used to feed microwaves into the sintering chamber. The paths of microwave feeding from the feed ports intersect with the sintering chamber, and are used to sinter the sample in the sintering chamber.

[0010] In a possible implementation manner, the sintering chamber is located at the center of the furnace body, and the plurality of microwave generators are evenly distributed around the furnace body.

[0011] In a possible embodiment, the furnace body is in the shape of a regular quadrangular prism, and the bottom of the furnace body is a square;

[0012] Wherein, the four top corners of the furnace body close to the bottom are each provided with a mounting portion, and each of the mounting portions is provided with the microwave generator.

[0013] In a possible embodiment, the furnace body is a cubic structure, and includes a bottom and an opposite top;

[0014] Wherein, the two vertex corners at the bottom and the two vertex corners at the top are both provided with mounting parts, and each mounting part is provided with the microwave generator.

[0015] In a possible implementation manner, the furnace body has a cubic structure;

[0016] Wherein, the eight top corners of the furnace body are each provided with a mounting portion; and each of the mounting portions is provided with the microwave generator.

[0017] In a possible implementation manner, the mounting portion is in an equilateral triangle structure, and the three vertices of the mounting portion are respectively located on the ridge lines of the furnace body.

[0018] In a possible embodiment, the microwave sintering furnace further includes a gas protection device, which is connected to the furnace body and is used to introduce protective gas into the furnace body.

[0019] In a possible embodiment, the microwave sintering furnace further includes a furnace cover and a cover-lifting mechanism;

[0020] The furnace cover is arranged at the furnace mouth of the furnace body;

[0021] The cover-lifting mechanism is arranged on the furnace body, and comprises a cover-lifting member and a driving assembly. The cover-lifting member is connected to the furnace cover, and the driving assembly drives the cover-lifting member to move closer to or away from the furnace opening.

[0022] In a possible embodiment, the microwave sintering furnace further includes a temperature detection device, which is disposed in the furnace body and is used to measure the real-time temperature of the sample in the sintering chamber.

[0023] In a possible embodiment, the furnace body further includes an inner cavity, which is disposed in the sintering chamber. The inner cavity is in a cube shape, and each diagonal portion of the inner cavity is provided with a cutout for microwaves to pass through.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] The present application provides a microwave sintering furnace, comprising a furnace body and a plurality of microwave generators; a sintering chamber for storing samples is formed in the furnace body; the plurality of microwave generators are all arranged in the furnace body and distributed around the furnace body; wherein the feed ports of the plurality of microwave generators are all facing the sintering chamber, and the paths of microwave feeding of the plurality of feed ports intersect with the sintering chamber, for sintering the samples in the sintering chamber. In the microwave sintering furnace provided by the present application, when sintering samples of lithium-ion battery positive electrode materials, each microwave generator heats the material along a certain individual diagonal. When the material transforms from a cubic system with higher symmetry to a rhombohedral system with lower symmetry, a grain in the cubic mother phase can grow into four subgrains with mutually oriented domains. This results in the appearance of more microscopic subgrain boundaries in the material, thereby significantly improving the physical properties of the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 A front view of a microwave sintering furnace provided in an embodiment of the present application is shown;

[0028] Figure 2 A schematic diagram of the three-dimensional structure of the assembly of the furnace body and the microwave generator in the microwave sintering furnace provided in an embodiment of the present application is shown;

[0029] Figure 3 Shown Figure 1 A left side view of a microwave sintering furnace is provided in FIG;

[0030] Figure 4 Shown Figure 3 Schematic diagram of the local enlarged structure at A in the middle;

[0031] Figure 5 Shown Figure 1A top view of a microwave sintering furnace is provided in FIG.

[0032] Description of main component symbols:

[0033] 100 - furnace body; 100a - sintering chamber; 100b - furnace mouth; 110 - mounting portion; 120 - furnace cover; 130 - clamping mechanism; 131 - flip plate; 132 - pressing member; 133 - arm;

[0034] 200-microwave generator; 210-flange structure;

[0035] 300-covering mechanism; 310-driving assembly; 311-transmission shaft; 312-driving hand wheel; 320-covering member; 330-support;

[0036] 400-frame; 410-shock-absorbing support feet;

[0037] 500-cooling device;

[0038] 600-control cabinet;

[0039] 700-Human-computer interaction device; 710-Display screen;

[0040] 800-Temperature detection device. DETAILED DESCRIPTION

[0041] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0042] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0044] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0045] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0046] Example 1

[0047] See also Figures 1 to 5 The present embodiment provides a microwave sintering furnace for sintering inorganic non-metallic materials (mainly oxides), specifically for preparing positive electrode materials for lithium-ion batteries. After the positive electrode materials for lithium-ion batteries are sintered in a microwave sintering furnace, the physical properties are significantly improved.

[0048] Please refer to Figure 1 and Figure 2 The microwave sintering furnace provided in this embodiment includes a frame 400, a furnace body 100, and multiple microwave generators 200. The bottom of the frame 400 contacts the ground, providing support for the microwave sintering furnace. The furnace body 100 is mounted on the frame 400, and a sintering chamber 100a for storing samples is formed within the furnace body 100. The microwave generators 200 are all mounted on the furnace body 100, and the multiple microwave generators 200 are distributed along the periphery of the furnace body 100.

[0049] Furthermore, the feed ports of the multiple microwave generators 200 are all facing the sintering chamber 100a, and the feed ports are used to feed microwaves into the sintering chamber 100a. The microwave feeding paths of the multiple feed ports intersect with the sintering chamber 100a, and are used for sintering the sample in the sintering chamber 100a.

[0050] Furthermore, in this embodiment, the furnace body 100 is made of stainless steel, the sintering chamber 100 a is located at the center of the furnace body 100 , and the plurality of microwave generators 200 are evenly distributed around the furnace body 100 .

[0051] That is, the sample is placed at the center of the furnace body 100 , and the extended lines of the feed ports of the microwave generators 200 intersect at the center of the furnace body 100 .

[0052] As can be understood, the sample is a positive electrode material for lithium-ion batteries. The paths of microwave feeds from multiple feed ports intersect in the sintering chamber 100a. In other words, the feed ports feed microwaves into the sintering chamber 100a to achieve focused sintering of the positive electrode material for lithium-ion batteries, thereby improving sintering strength and efficiency.

[0053] The microwave sintering furnace provided in this embodiment is mainly aimed at certain functional materials among inorganic non-metallic materials (mainly oxides) that will undergo a transformation from a cubic system to a non-cubic system during the sintering process. For example, LICoO2 in lithium-ion electronic positive electrode materials, and binary or ternary lithium-ion battery positive electrode materials with the same crystal structure, are considered to be obtained after the cubic system is ordered along a certain

[111] direction; in perovskite materials, when the atoms at the A and B positions are composed of several atoms, it is also possible to form an order. Once the order is formed, the symmetry of the cubic structure of the perovskite will be reduced. In this case, multiple orientation domains may be formed. After sintering this type of material in the microwave sintering furnace provided in this embodiment, orientation domains that originally did not exist may appear, and it is also possible to cause high-density orientation domains to appear in materials with low orientation domain density, thereby significantly changing the physical properties of the material.

[0054] The microwave sintering furnace provided in this embodiment is not only used to sinter samples, but also can enable the atomic groups inside the sample to couple with each other under the action of microwaves. If the coupling occurs along a specific cubic diagonal direction, the resulting crystal microstructure should be reflected. Therefore, when there is a transition from a cubic crystal system to a non-cubic crystal system during the sintering process, orientation domains may be more easily formed.

[0055] Therefore, this embodiment provides a microwave sintering furnace, in which a plurality of microwave generators 200 are distributed around the furnace body 100. The feed ports of the plurality of microwave generators 200 feed microwaves into the sintering chamber 100a to achieve focused sintering of lithium-ion battery positive electrode materials. When sintering samples of lithium-ion battery positive electrode materials, each microwave generator 200 heats the material along a certain individual diagonal. When the material transforms from a more symmetrical cubic system to a less symmetrical rhombohedral system, a grain in the cubic system matrix can grow into four mutually oriented subgrains, that is, more oriented domains can be formed when the material transforms from a more symmetrical cubic system to a less symmetrical rhombohedral system. This results in the appearance of more microscopic subgrain boundaries in the material, thereby significantly improving the physical properties of the material, such as the electrical conductivity and rate performance of the material.

[0056] Example 2

[0057] See also Figures 1 to 5 This embodiment provides a microwave sintering furnace for preparing positive electrode materials for lithium-ion batteries. After sintering the positive electrode materials for lithium-ion batteries in the microwave sintering furnace, the physical properties of the positive electrode materials for lithium-ion batteries are significantly improved. This embodiment is an improvement based on the technology of the above-mentioned embodiment 1. Compared with the above-mentioned embodiment 1, the main differences are:

[0058] Please refer to Figure 1 、 Figure 2 、 Figure 3 as well as Figure 5 In this embodiment, the furnace body 100 is a vertical structure, and the furnace body 100 is a regular quadrangular prism structure, the bottom of the furnace body 100 is a square, and the number of the microwave generators 200 is four.

[0059] The four top corners of the furnace body 100 near the bottom are each provided with a mounting portion 110 , and each mounting portion 110 is provided with a microwave generator 200 , thereby achieving uniform distribution of the four microwave generators 200 .

[0060] Furthermore, the mounting portion 110 is shaped like an equilateral triangle, with its three vertices located on the edges of the furnace body 100. In other words, the four corners of the bottom of the furnace body 100 each form a mounting portion 110 in the shape of an equilateral triangle. Furthermore, the mounting portion 110 is connected to the microwave generator 200 via a flange structure 210.

[0061] It will be appreciated that the microwaves from the four feed inlets are fed in directions along the four corners of the bottom of the furnace body 100 toward the center of the furnace body 100, intersecting at the center of the furnace body 100. The evenly distributed four microwave generators 200 allow the feed inlet of each microwave generator 200 to better correspond to the cubic mother phase, enabling simultaneous sintering of multiple cubic mother phases. This allows the cubic mother phase to form more orientation domains during its transformation to a less symmetric phase, thereby significantly improving the physical properties of the material.

[0062] In some embodiments, the furnace body 100 has a cubic structure, and the furnace body 100 includes a bottom and a relative top, wherein the two top corners at the bottom are provided with mounting portions 110, and the two top corners at the top are also provided with mounting portions 110. It can be understood that there are four mounting portions 110 in total, and each mounting portion 110 is provided with a microwave generator 200. It can also be achieved that the direction of microwave feeding of the four feeding ports is along the four top corners of the bottom of the furnace body 100 toward the center of the furnace body 100, and intersects at the center of the furnace body 100.

[0063] There are many ways to set up the four mounting portions 110, specifically, they can be:

[0064] In the first method, the four mounting portions 110 are arranged along the diagonal line of the furnace body 100 , that is, the vertical planes where the mounting portions 110 at the two bottom corners are located are parallel to the vertical planes where the mounting portions 110 at the two top corners are located.

[0065] In the second method, the four mounting portions 110 are all located in the same vertical plane.

[0066] In a third embodiment, the vertical planes where the mounting portions 110 at the two vertex corners at the bottom are located are perpendicular to the vertical planes where the mounting portions 110 at the two vertex corners at the top are located.

[0067] In other embodiments, the furnace body 100 is a cubic structure, wherein mounting portions 110 are provided at four corners of the top of the furnace body 100 , and each mounting portion 110 is provided with a microwave generator 200 .

[0068] In other embodiments, the furnace body 100 has a cubic structure, wherein the eight top corners of the furnace body 100 are each provided with a mounting portion 110; each mounting portion 110 is provided with a microwave generator 200, thereby increasing the intensity of the microwave, improving the sintering efficiency, and allowing the parent phase of the cubic crystal system to form more orientation domains during the process of transition to a phase with lower symmetry, thereby significantly improving the physical properties of the material.

[0069] Example 3

[0070] See also Figures 1 to 5This embodiment provides a microwave sintering furnace for preparing positive electrode materials for lithium-ion batteries. After sintering the positive electrode materials for lithium-ion batteries in the microwave sintering furnace, the physical properties of the positive electrode materials for lithium-ion batteries are significantly improved. This embodiment is an improvement based on the technology of the above-mentioned embodiment 1 or embodiment 2. Compared with the above-mentioned embodiment 1 or embodiment 2, the main differences are:

[0071] Please refer to Figure 1 In this embodiment, the rack 400 is a frame structure, and a control cabinet 600 is provided inside the rack 400 , wherein the electrical control system of the microwave generator 200 is provided in the control cabinet 600 .

[0072] Furthermore, in order to reduce the vibration of the microwave sintering furnace during operation, four shock-absorbing support feet 410 with adjustable heights are provided under the frame 400 .

[0073] The microwave sintering furnace further includes a human-machine interaction device 700 , a gas protection device (not shown), a temperature detection device 800 and a cooling device 500 .

[0074] The human-machine interaction device 700 is disposed on the rack 400 and includes a touch-sensitive display screen 710 . The power setting and sintering temperature of each microwave generator 200 and other process flows can all be set via the display screen 710 .

[0075] The gas protection device is connected to the furnace body 100 through a pipeline. Specifically, the gas protection device is connected to a gas inlet on the furnace body 100. When the furnace body 100 is sintering, the gas protection device passes the protective gas into the sintering chamber 100a to achieve gas-protected sintering.

[0076] Please refer to Figure 3 The temperature detection device 800 is installed in the furnace body 100 and is used to measure the real-time temperature of the sample in the sintering chamber 100a. The temperature detection device 800 includes a thermocouple and an infrared temperature detector. The thermocouple is installed in the furnace body 100 and is used to detect the real-time temperature of the sintered sample. The infrared temperature detector is installed in a small hole in the top of the furnace body 100 to detect the temperature of the sample at higher temperatures. It can be understood that the infrared temperature detector serves as a supplement to the thermocouple.

[0077] In some embodiments, a transparent window is provided on the side wall of the furnace body 100 , and an infrared temperature detector is provided at the transparent window to detect the temperature of the sample in the sintering chamber 100 a .

[0078] Please refer to Figure 1The cooling device 500 includes a main cooling pipe, which is connected to the cooling water system. The main cooling pipe is connected to the microwave generator 200 through a branch cooling pipe for circulating cooling to ensure that the microwave generator 200 does not malfunction due to excessive temperature when working at full load, thereby reducing maintenance costs and improving production efficiency.

[0079] Please refer to Figure 1 、 Figure 3 as well as Figure 4 Furthermore, the microwave sintering furnace also includes a furnace cover 120 and a cover-lifting mechanism 300. The furnace cover 120 is arranged at the furnace mouth 100b of the furnace body 100. The furnace cover 120 is sealed with the furnace body 100 to achieve the sealing of the sintering chamber 100a and create conditions for vacuum sintering.

[0080] Furthermore, in order to improve the stability of the furnace cover 120 after it is covered with the furnace body 100, at least three clamping mechanisms 130 are provided at the upper end of the furnace body 100. The clamping mechanism 130 includes an L-shaped flip plate 131, a pressure piece 132 and an arm 133, wherein the end of the vertical section of the L-shaped flip plate 131 is rotatably matched with the furnace body 100, that is, the flip plate 131 can rotate relative to the furnace body 100, and the pressure piece 132 is provided on the horizontal section of the flip plate 131. The pressure piece 132 is threadedly matched with the flip plate 131, and the arm 133 is passed through the end of the pressure piece 132 away from the flip plate 131. When in use, rotate the flip plate 131 so that the horizontal sections of the flip plate 131 are opposite to each other, hold the arm 133 and rotate it, and the arm 133 drives the pressing piece 132 to approach the furnace cover 120, thereby realizing that the pressing piece 132 presses the furnace cover 120, making the furnace cover 120 and the furnace body 100 cover more stably and ensuring good sealing.

[0081] The cover-lifting mechanism 300 is provided on the furnace body 100 and includes a driving assembly 310 and a cover-lifting member 320 . The cover-lifting member 320 is connected to the furnace cover 120 . The driving assembly 310 is connected to the cover-lifting member 320 . The driving assembly 310 drives the cover-lifting member 320 to move closer to or away from the furnace opening 100 b.

[0082] Among them, the driving assembly 310 includes a driving handwheel 312 and a transmission shaft 311. The transmission shaft 311 is installed on the furnace body 100 through a support 330. The transmission shaft 311 rotates in conjunction with the support 330. The driving handwheel 312 is arranged at the end of the transmission shaft 311. The transmission shaft 311 and the cover-lifting member 320 are threadedly matched. By rotating the driving handwheel 312, the cover-lifting member 320 can be driven to move up and down along the axial direction of the transmission shaft 311, thereby driving the furnace cover 120 to approach or move away from the furnace mouth 100b.

[0083] In some embodiments, the driving hand wheel 312 can be replaced with a motor to achieve electric control of lid lifting.

[0084] In other embodiments, the cover-lifting member 320 and the transmission shaft 311 are in anti-rotational cooperation, and the transmission shaft 311 drives the cover-lifting member 320 to rotate around the axis of the transmission shaft 311 , so that the furnace opening 100 b is separated from the furnace cover 120 .

[0085] Furthermore, in this embodiment, the furnace body 100 also includes an inner cavity (not shown in the figure), which is arranged in the sintering chamber 100a of the furnace body 100. The inner cavity is a cube and is made of metal. The diagonals of the inner cavity are provided with cuts for microwaves to pass through. After the microwaves pass through the cuts, they are reflected back and blocked by the outer wall of the inner cavity, thereby avoiding the reflection of the metal inside the sintering chamber 100a and affecting the sintering of the sample.

[0086] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0087] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A microwave sintering furnace, characterized in that: It includes a furnace body and a plurality of microwave generators; A sintering chamber for storing samples is formed in the furnace body; The plurality of microwave generators are all disposed on the furnace body and distributed around the furnace body; The feeding ports of the plurality of microwave generators are all directed toward the sintering chamber, and the feeding ports are used to feed microwaves into the sintering chamber, and the paths of the microwave feeding ports intersect with the sintering chamber, so as to sinter the sample in the sintering chamber; The furnace body is in a regular quadrangular prism structure, and the bottom of the furnace body is a square; wherein, the four corners of the furnace body close to the bottom are each provided with a mounting portion, and each mounting portion is provided with the microwave generator; or The furnace body is a cubic structure, comprising a bottom and an opposite top; wherein two top corners of the bottom and two top corners of the top are each provided with a mounting portion, and each mounting portion is provided with the microwave generator; or The furnace body is a cubic structure; wherein the eight corners of the furnace body are each provided with a mounting portion; each mounting portion is provided with the microwave generator; The microwave feeding directions of the plurality of feeding ports are along the top angle of the furnace body toward the center of the furnace body, and intersect at the center of the furnace body.

2. The microwave sintering furnace according to claim 1, characterized in that The mounting portion is in an equilateral triangle structure, and the three vertices of the mounting portion are respectively located on the ridge lines of the furnace body.

3. The microwave sintering furnace according to claim 1, characterized in that The microwave sintering furnace further comprises a gas protection device, which is connected to the furnace body and is used to introduce protective gas into the furnace body.

4. The microwave sintering furnace according to claim 1, characterized in that The microwave sintering furnace also includes a furnace cover and a cover-lifting mechanism; The furnace cover is arranged at the furnace mouth of the furnace body; The cover-lifting mechanism is arranged on the furnace body, and comprises a cover-lifting member and a driving assembly. The cover-lifting member is connected to the furnace cover, and the driving assembly drives the cover-lifting member to move closer to or away from the furnace opening.

5. The microwave sintering furnace according to claim 1, characterized in that: The microwave sintering furnace further comprises a temperature detection device, which is arranged on the furnace body and is used to measure the real-time temperature of the sample in the sintering chamber.

6. The microwave sintering furnace according to claim 1, characterized in that: The furnace body further comprises an inner cavity, which is arranged in the sintering chamber and is in the shape of a cube. The diagonals of the inner cavity are each provided with a cutout for microwaves to pass through.

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