CN215413159U - Vacuum microwave sintering furnace - Google Patents
Vacuum microwave sintering furnace Download PDFInfo
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- CN215413159U CN215413159U CN202121877408.9U CN202121877408U CN215413159U CN 215413159 U CN215413159 U CN 215413159U CN 202121877408 U CN202121877408 U CN 202121877408U CN 215413159 U CN215413159 U CN 215413159U
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Abstract
The utility model discloses a vacuum microwave sintering furnace, comprising: the microwave oven comprises a resonant cavity, a microwave heating inner container, a magnetron, a power transformer, a waveguide, a thermocouple, a water cooling device and a display control device; the oven door is arranged on the front side of the resonant cavity, the microwave heating liner is arranged in the resonant cavity, the magnetron and the waveguide are arranged on the outer side wall of the sintering oven box body, the waveguide is positioned between the magnetron and the outer side wall of the sintering oven box body, and the waveguide is used for conducting microwaves generated by the magnetron to the resonant cavity; the power transformer is arranged on the outer side wall of the sintering furnace box body and is connected with the magnetron circuit; the thermocouple is arranged at the top of the sintering furnace box body; the display control device is arranged on the front side wall of the sintering furnace box body and is in signal control connection with the power transformer and the thermocouple; the water cooling device is connected with the magnetron pipeline. The device has the advantages of simple structure, small volume and uniform heating, and greatly improves the heat treatment and sintering efficiency of the material.
Description
Technical Field
The utility model relates to the technical field of microwave heating, in particular to a vacuum microwave sintering furnace.
Background
At present, the heat treatment of metal and composite materials thereof and the sintering of metal, ceramic or glass materials are mainly carried out in a high-temperature box furnace, a tubular furnace, an atmosphere furnace or a muffle furnace, but the equipment has larger volume, high price and difficult operation, and the development of heat treatment and sintering processes is limited. In the case of a box-type annealing furnace, when the resistance heating temperature exceeds 1000 ℃, the refractory material is likely to conduct electricity, and most of the heat is conducted from the coil to the coil due to the limitation of the stack height, so that the heating is hindered, and the efficiency is not high. And the muffle furnace is slow in heating rate because the hearth is a refractory brick, the temperature is rapidly increased and decreased to cause uneven temperature field in the hearth to cause cracking of materials, and the resistance heating wire is easy to break.
Microwave heating is a special heating mode, and is widely applied due to instantaneity, integrity, selectivity, high efficiency and no pollution, and microwave sintering is a mode of sintering materials by using a microwave heating technology, and is a method for enabling internal molecules to vibrate and collide by using the materials to absorb microwaves and convert the microwaves into kinetic energy and internal energy, so that the materials are uniformly heated to a certain temperature, and the densification of the materials is realized.
The microwave high-temperature sintering furnace has the advantages of long service life of microwave elements, difficult damage, rapid temperature rise, non-contact heating without material pollution and the like, and is applied to scientific research institutes, universities and families. However, the microwave sintering furnace on the market has large volume and floor space, and cannot be applied to universities, scientific research institutions and families, so that the microwave heating technology cannot be well applied to laboratory research and family application, and the defects of the large microwave sintering furnace on the market at present are as follows: the equipment has higher price and larger volume, and can not be borne by common laboratories and families; the application range is narrow, auxiliary heating materials are required to be added to materials with poor microwave absorption capacity, and even if the auxiliary heating materials are added, uniform heating cannot be achieved; the traditional microwave heating is to make the internal molecules of the material vibrate and convert into kinetic energy and internal energy, which is a heating technology from inside to outside, so that the result is inaccurate temperature measurement, and the internal temperature of the material is higher than or even far higher than the surface temperature of the material, thereby causing the phenomenon of overburning of the material.
Therefore, the utility model provides microwave sintering equipment which has the advantages of small volume, no pollution, quick temperature rise, uniform heating, high heat treatment and sintering efficiency and the like, and is suitable for scientific research institutes, colleges and universities and families, and the problem which is continuously solved by technical personnel in the field is solved.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a vacuum microwave sintering furnace which is simple in structure, small in size and uniform in heating, and greatly improves the heat treatment and sintering efficiency of materials. In order to solve the above problems, the technical solution provided by the present invention is as follows:
the utility model relates to a vacuum microwave sintering furnace, which comprises: the microwave oven comprises a resonant cavity, a microwave heating inner container, a magnetron, a power transformer, a waveguide, a thermocouple, a water cooling device and a display control device; a furnace door is arranged on the front side of the resonant cavity and is a light-permeable furnace door, and the microwave heating liner is arranged in the resonant cavity; the magnetron and the waveguide are arranged on the outer side wall of the sintering furnace box body, the waveguide is positioned between the magnetron and the outer side wall of the sintering furnace box body, and the waveguide is used for transmitting the microwave generated by the magnetron to the resonant cavity; the power transformer is arranged on the outer side wall of the sintering furnace box body and is connected with the magnetron circuit; the thermocouple is arranged at the top of the sintering furnace box body; the display control device is arranged on the front side wall of the sintering furnace box body and is in signal control connection with the power transformer and the thermocouple; the water cooling device is connected with the magnetron pipeline.
Furthermore, the sintering furnace box body and the resonant cavity are of a square box type structure, a cylindrical structure or a round platform barrel type structure, and the resonant cavity is made of stainless steel with smooth inner walls.
Further, the power of the magnetron is 1000W-5000W, and the power transformer changes the output power of the magnetron by adjusting the voltage.
Furthermore, the furnace door is made of light-permeable glass, a layer of metal wire mesh is arranged in the middle of the furnace door, and the metal wire mesh is made of stainless steel wires or copper wires.
Further, the thermocouple is a K-type thermocouple, an S-type thermocouple or an N-type thermocouple, and the detection accuracy of the thermocouple is +/-1 ℃.
Further, a heat insulating layer is coated outside the microwave heating inner container, the microwave heating inner container is made of silicon carbide, boron carbide, tungsten carbide or titanium nitride, and the heat insulating layer is made of a ceramic heat insulating material.
The vacuum microwave sintering furnace provided by the utility model has the beneficial effects that:
compared with the traditional microwave sintering furnace, the microwave sintering furnace has small equipment volume and wide application range, after the microwave generator magnetron emits microwaves, the microwaves enter the resonant cavity made of the metal plate through the waveguide and are absorbed by the liner positioned in the resonant cavity, molecules in the liner begin to vibrate after absorbing the microwaves and convert the microwaves into kinetic energy and internal energy, the temperature begins to rise, and the molecules begin to transmit energy to the inside in the form of thermal radiation, which is equivalent to a secondary heating source, so that the material is uniformly heated, and the purpose of sintering the material or other heat treatment is achieved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a vacuum microwave sintering furnace according to an embodiment of the present invention, wherein a sintering furnace box body and a resonant cavity are in a square box type structure;
FIG. 2 is a schematic structural view of a microwave heating liner of a vacuum microwave sintering furnace according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a vacuum microwave sintering furnace according to an embodiment of the present invention, wherein a sintering furnace box body and a resonant cavity are in a cylindrical structure.
In the figure, each label is specifically:
1-a resonant cavity; 2-heating the inner container by microwave; 3-a magnetron; 4-a power transformer; 5-a waveguide; 6-a thermocouple; 7-a water cooling device; 8-a display control device; 9-a vacuum-pumping device; 11-furnace door; 21-heat insulating layer.
Detailed Description
In order to make the technical solutions in the embodiments of the present invention better understood and make the above objects, features, and advantages of the present invention more comprehensible, specific embodiments of the present invention are described below with reference to the accompanying drawings.
It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Referring to fig. 1, fig. 2 and fig. 3, a vacuum microwave sintering furnace of the present embodiment includes: the microwave oven comprises a resonant cavity 1, a microwave heating inner container 2, a magnetron 3, a power transformer 4, a waveguide 5, a thermocouple 6, a water cooling device 7 and a display control device 8; a furnace door 11 is arranged at the front side of the resonant cavity 1, the furnace door 11 is a light-permeable furnace door, and the microwave heating inner container 2 is arranged in the resonant cavity 1; the magnetron 3 and the waveguide 5 are arranged on the outer side wall of the sintering furnace box body, the waveguide 5 is positioned between the magnetron 3 and the outer side wall of the sintering furnace box body, and the waveguide 5 is used for conducting the microwave generated by the magnetron 3 to the resonant cavity 1. The power transformer 4 is arranged on the outer side wall of the sintering furnace box body and is in circuit connection with the magnetron 3; the thermocouple 6 is arranged at the top of the sintering furnace box body; the display control device 8 is arranged on the front side wall of the sintering furnace box body and is in signal control connection with the power transformer 4 and the thermocouple 6; the water cooling device 7 is connected with the magnetron 3 through a pipeline.
As a further embodiment, referring to fig. 1, the sintering furnace box body and the resonant cavity 1 are of a square box type structure, and referring to fig. 3, the sintering furnace box body and the resonant cavity 1 are of a cylindrical structure. Alternatively, the resonant cavity 1 may also be a truncated cone-barrel structure or other structures. The resonant cavity 1 is made of stainless steel with smooth inner wall,
preferably, the power of the magnetron 3 is 1000W-5000W, and the power transformer 4 changes the output power of the magnetron 3 by adjusting the voltage.
Preferably, an oven door 11 is opened at the front side of the resonant cavity 1, and the oven door 11 is a light-permeable oven door. The furnace door 11 is made of light-permeable glass, a layer of metal wire mesh is arranged in the middle of the furnace door 11, and the metal wire mesh is made of stainless steel wires or copper wires.
Preferably, the thermocouple 6 is a K-type thermocouple, an S-type thermocouple, or an N-type thermocouple, and the detection accuracy of the thermocouple 6 is ± 1 ℃.
Preferably, the microwave heating liner 2 is externally coated with a heat insulating layer 21, the microwave heating liner 2 is made of silicon carbide, boron carbide, tungsten carbide or titanium nitride, and the heat insulating layer 21 is made of a ceramic heat insulating material.
Three specific embodiments of the sintering test using the vacuum microwave sintering furnace of the present invention are as follows:
example one
The composition of a metal injection material used in this example is shown in Table 1, and Table 1 shows the chemical composition of a metal injection material in wt%
The semi-finished product obtained by injecting the metal injection raw material in the example is placed in a microwave heating container 2 of a vacuum microwave sintering furnace, after the semi-finished product is placed in a square box type vacuum microwave sintering furnace shown in figure 1, a resonant cavity 1 of the vacuum microwave sintering furnace and the microwave heating container 2 are vacuumized by a vacuumizing device 9, the vacuum degree is 0.1MPa, and the semi-finished product is subjected to thermal degreasing and sintering in the box type small vacuum microwave sintering furnace. Rapidly heating from room temperature to 450 ℃ and preserving heat for 30min, heating from 450 ℃ to 600 ℃ at a speed of 15 ℃/min and preserving heat for 120min to finish thermal degreasing, then continuously heating to 1050 ℃ at a speed of 10 ℃/min and preserving heat for 30min, heating from 1050 ℃ to 1290 ℃ at a speed of 5 ℃/min and preserving heat for 180min, and then naturally cooling to room temperature to finish sintering. The sintered product is compact and has no deformation and metallic luster, the shrinkage rate in the X direction is 17 percent, the shrinkage rate in the Y direction is 17 percent, and the shrinkage rate in the Z direction is 18 percent.
Example two
The composition of a metal injection material used in this example is shown in Table 2, and Table 2 shows the chemical composition of a metal injection material in wt%
The semi-finished product obtained by injecting the metal injection raw material in the example is placed in a microwave heating container 2, the resonant cavity 1 of a vacuum microwave sintering furnace and the microwave heating container 2 are vacuumized by a vacuumizing device 9, the vacuum degree is 0.1MPa, and the semi-finished product is subjected to thermal degreasing and sintering in the vacuum microwave sintering furnace. Rapidly heating from room temperature to 450 ℃ and preserving heat for 30min, heating from 450 ℃ to 800 ℃ at a speed of 15/min and preserving heat for 60min to finish thermal degreasing, then continuously heating to 1150 ℃ at a speed of 10 ℃/min and preserving heat for 30min, heating from 1150 ℃ to 1370 ℃ at a speed of 5 ℃/min and preserving heat for 120min, and then naturally cooling to room temperature to finish sintering. The sintered product is compact and has no deformation and metallic luster, the shrinkage rate in the X direction is 16 percent, the shrinkage rate in the Y direction is 15 percent, and the shrinkage rate in the Z direction is 17 percent.
EXAMPLE III
Table 3 shows the compositions of the laser-sintered aluminum alloys in a selected area, and Table 3 shows the chemical compositions (wt%) of the laser-sintered aluminum alloys in a selected area
The aluminum alloy obtained by the selective laser sintering in this example is placed in a vacuum microwave heating container, the inside of a resonant cavity 1 and the inside of a microwave heating container 2 of a vacuum microwave sintering furnace are vacuumized by a vacuumizing device 9, the vacuum degree is 0.1MPa, and the semi-finished product is subjected to heat treatment in the vacuum microwave sintering furnace. And (4) rapidly heating from room temperature to 400 ℃ and preserving heat for 90min, and cooling the furnace to room temperature after heat preservation is finished. The mechanical property of the finished product after heat treatment is improved by 10-15%, the hardness distribution is uniform, and the grain size is reduced by 10-20% before heat treatment.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments.
The embodiments of the present invention are described in detail above with reference to the drawings, but the present invention is not limited to the described embodiments. Various changes, modifications, substitutions and alterations to these embodiments will occur to those skilled in the art without departing from the spirit and scope of the present invention.
Claims (6)
1. A vacuum microwave sintering furnace, comprising: the microwave oven comprises a resonant cavity (1), a microwave heating inner container (2), a magnetron (3), a power transformer (4), a waveguide (5), a thermocouple (6), a water cooling device (7) and a display control device (8);
an oven door (11) is arranged on the front side of the resonant cavity (1), the oven door (11) is a light-permeable oven door, and the microwave heating liner (2) is arranged in the resonant cavity (1); the magnetron (3) and the waveguide (5) are arranged on the outer side wall of the sintering furnace box body, the waveguide (5) is positioned between the magnetron (3) and the outer side wall of the sintering furnace box body, and the waveguide (5) is used for transmitting the microwave generated by the magnetron (3) to the resonant cavity (1);
the power transformer (4) is arranged on the outer side wall of the sintering furnace box body and is in circuit connection with the magnetron (3); the thermocouple (6) is arranged at the top of the sintering furnace box body; the display control device (8) is arranged on the front side wall of the sintering furnace box body and is in signal control connection with the power transformer (4) and the thermocouple (6); the water cooling device (7) is connected with the magnetron (3) through a pipeline.
2. The vacuum microwave sintering furnace according to claim 1, characterized in that the sintering furnace box body and the resonant cavity (1) are of a square box type structure, a cylindrical structure or a truncated cone-shaped structure, and the resonant cavity (1) is made of stainless steel with smooth inner wall.
3. The vacuum microwave sintering furnace according to claim 2, characterized in that the power of the magnetron (3) is 1000W-5000W, and the power transformer (4) varies the output power of the magnetron (3) by adjusting the voltage.
4. The vacuum microwave sintering furnace according to claim 1, characterized in that the furnace door (11) is made of transparent glass, a layer of metal wire mesh is arranged in the middle of the furnace door (11), and the metal wire mesh is made of stainless steel wire or copper wire.
5. The vacuum microwave sintering furnace according to any claim 1 to 4, characterized in that the thermocouple (6) is a type K thermocouple, a type S thermocouple or a type N thermocouple, and the detection accuracy of the thermocouple (6) is ± 1 ℃.
6. The vacuum microwave sintering furnace according to any one of claims 1 to 4, characterized in that the microwave heating inner container (2) is coated with a heat insulating layer (21), the microwave heating inner container (2) is made of silicon carbide, boron carbide, tungsten carbide or titanium nitride, and the heat insulating layer (21) is made of ceramic heat insulating material.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121877408.9U CN215413159U (en) | 2021-08-12 | 2021-08-12 | Vacuum microwave sintering furnace |
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| CN202121877408.9U CN215413159U (en) | 2021-08-12 | 2021-08-12 | Vacuum microwave sintering furnace |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116659239A (en) * | 2023-07-31 | 2023-08-29 | 康硕(德阳)智能制造有限公司 | Ceramic part sintering furnace |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116659239A (en) * | 2023-07-31 | 2023-08-29 | 康硕(德阳)智能制造有限公司 | Ceramic part sintering furnace |
| CN116659239B (en) * | 2023-07-31 | 2023-10-13 | 康硕(德阳)智能制造有限公司 | Ceramic part sintering furnace |
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