CN210952312U - Heating cavity for metal powder forming microwave composite sintering equipment - Google Patents
Heating cavity for metal powder forming microwave composite sintering equipment Download PDFInfo
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- CN210952312U CN210952312U CN201921478422.4U CN201921478422U CN210952312U CN 210952312 U CN210952312 U CN 210952312U CN 201921478422 U CN201921478422 U CN 201921478422U CN 210952312 U CN210952312 U CN 210952312U
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Abstract
The utility model discloses a metal powder shaping microwave composite sintering equipment is with heating cavity, it includes the microwave cavity, install in the inside microscope carrier of microwave cavity, locate thermal-insulated ripples cavity of passing through on the microscope carrier and install on the microwave cavity and be used for the wave guide of heating, set up in the inside sintering support plate that is used for bearing the metal powder blank of thermal-insulated ripples cavity of passing through, this thermal-insulated ripples cavity of passing through is inside to be equipped with a plurality of evenly distributed's ripples auxiliary heating layer of inhaling, be formed with the interval between the adjacent two ripples auxiliary heating layers of inhaling. The utility model discloses microwave-absorbing auxiliary heating layer to the inside setting of microwave cavity is high at low temperature microwave heating efficiency in the microwave, makes the inside rapid heating up of thermal-insulated ripples cavity that passes through to can carry out radiant heating in order to realize auxiliary heating to the metal powder embryo, reach the composite heating function, thereby effectively solve metal powder's microwave sintering problem, so that it is fast to reach the programming rate, the sintering time is short, the effect that the energy consumption is low, metal powder microwave sintering's efficiency and quality have been promoted greatly.
Description
The technical field is as follows:
the utility model relates to a metal powder shaping microwave sintering technical field refers in particular to a metal powder shaping microwave composite sintering equipment is with heating cavity.
Background art:
the microwave is an electromagnetic wave in a wave band between radio waves and infrared rays, the wavelength is 1mm-1m, the frequency is 00MHZ-300GHZ, the microwave is also commonly called ultra-high frequency electromagnetic wave, and compared with the electromagnetic wave in other wave bands, the microwave has the characteristics of short wavelength, high frequency, strong penetrating power, obvious quantum property and the like. The wavelength range of which is on the same order of magnitude or smaller as compared with the size of general objects on earth, microwaves are polarized and coherent waves like other visible light except for laser light, and the interaction with a substance differs depending on the nature of the substance, and can be transmitted, absorbed or reflected, i.e., has selectivity, following the law of light. Meanwhile, the microwave has a transit time effect, a radiation effect and a skin effect.
According to the microwave heating principle, the volume heating mode of the microwave can enable the temperature distribution of the sample to be uniform. However, if the sample is directly exposed to the atmosphere, the surface temperature is lower than the internal temperature due to the radiation and convection heat loss of the surface, and the temperature distribution of the sample is not uniform, so that the temperature measurement of the sample is inaccurate, and the sample is deformed and cracked.
Therefore, how to keep the temperature inside the sintered sample uniform becomes a key link in the microwave sintering process. Due to the particularity of microwave sintering, the temperature gradient direction of a sample to be sintered is from inside to outside, the temperature is rapidly increased and decreased, and an alloy sample is easy to crack, so that a proper heat-insulating material is required to be selected. In addition, the heat-insulating layer plays multiple roles of reducing heat loss, preheating low-loss materials, preventing microwave ignition phenomenon in the heating cavity and the like in the sintering process, so that the selection of the heat-insulating material in the microwave sintering system becomes one of the key factors for determining the success of microwave sintering.
The metal powder forming methods include Powder Metallurgy (PM), Metal Injection Molding (MIM), 3D printing (3DP), and the like, but all of them require an important process of sintering metal powder to obtain a metal product. Compared with the traditional electric heating mode, the microwave sintering has obvious advantages due to the electromagnetic wave particularity: heating integrally; selectively heating; no thermal inertia; a negative temperature gradient; the heating speed is high, and the sintering time is short; the energy consumption is low; the sintered product exhibits better microstructure and properties. Microwave sintering of metal powders has not been discovered and put into practical use by state university, shores, until 1999 due to the skin effect of the metal surface. Experimental results prove that the metal powder belongs to a low-loss medium at low temperature (600 ℃), has weak action with microwave, has poor microwave absorption capability, is difficult to absorb the microwave even for individual metal, has obviously improved microwave absorption characteristic at high temperature and can realize microwave sintering. How to achieve rapid heating at low temperature is an implemented method to incorporate wave-absorbing materials into metal powder, but this method is detrimental to the final sintered product performance.
In view of the above, the present inventors propose the following.
The utility model has the following contents:
an object of the utility model is to overcome prior art not enough, provide a metal powder shaping microwave composite sintering equipment is with heating cavity.
In order to solve the technical problem, the utility model discloses a following technical scheme: this metal powder shaping microwave composite sintering equipment includes with heating cavity: the microwave cavity, install in the inside microscope carrier of microwave cavity, set up the thermal-insulated wave-transparent cavity on the microscope carrier and install on this microwave cavity and be used for the waveguide pipe of heating, set up in the inside sintering support plate that is used for bearing the weight of metal powder green of this thermal-insulated wave-transparent cavity, this thermal-insulated wave-transparent cavity is inside to be provided with a plurality of evenly distributed inhale ripples auxiliary heating layer, is formed with the interval between two adjacent ripples auxiliary heating layers.
Furthermore, in the above technical scheme, the heat-insulating wave-transparent cavity includes a wave-transparent temperature-resistant ceramic ring body with a circular ring-shaped cross section, a bottom plate disposed at a lower end of the wave-transparent temperature-resistant ceramic ring body, and a cover plate disposed at an upper end of the wave-transparent temperature-resistant ceramic ring body, and the wave-absorbing auxiliary heating layer is disposed on an inner wall of the wave-transparent temperature-resistant ceramic ring body.
Further, in the technical scheme, the area of the wave-absorbing auxiliary heating layer accounts for 1/2-1/3 of the area of the inner wall of the wave-transmitting temperature-resistant ceramic ring body.
Further, in the above technical scheme, the area of the wave-absorbing auxiliary heating layer accounts for 1/2 of the inner wall area of the wave-transmitting temperature-resistant ceramic ring body.
Further, in the above technical scheme, the thickness of the wave-absorbing auxiliary heating layer is 2-10 mm; the thickness of the wave-transparent temperature-resistant ceramic ring body is 10-35 mm.
Furthermore, in the above technical scheme, the wave-absorbing auxiliary heating layer is a silicon carbide coating fixed on the inner wall of the wave-transparent temperature-resistant ceramic ring body in a coating manner, and the wave-absorbing auxiliary heating layer and the wave-transparent temperature-resistant ceramic ring body form a whole.
Further, in the above technical solution, the carrier is fixed inside the microwave cavity.
Furthermore, in the above technical solution, a rotating shaft is disposed at a lower end of the carrier, and the lower end of the rotating shaft penetrates through a lower end of the microwave cavity and is connected to the rotation driving device, so that the carrier is rotatably mounted inside the microwave cavity.
Furthermore, in the above technical solution, the microwave cavity is a stainless steel tank body, and a cooling water channel is arranged in an interlayer of the stainless steel tank body.
Further, in the above technical solution, the microwave cavity is provided with an observation window, an air inlet, an exhaust duct and a temperature measuring instrument, and the temperature measuring instrument extends into the heat-insulating wave-transmitting cavity.
After the technical scheme is adopted, compared with the prior art, the utility model has following beneficial effect: when the utility model works, the waveguide tube conducts microwave which heats the gas in the microwave cavity, the heated gas heats the heat-insulating wave-transmitting cavity, the microwave can also penetrate through the heat-insulation wave-transmitting cavity to heat the metal powder green body in the heat-insulation wave-transmitting cavity, because the microwave heating efficiency of the metal powder is low at low temperature, the microwave heating efficiency of the microwave-absorbing auxiliary heating layer arranged in the microwave cavity of the utility model is extremely high at low temperature, the temperature in the heat-insulating wave-transmitting cavity is rapidly increased, so that the metal powder green body can be radiated and heated to realize auxiliary heating and achieve the function of composite heating, thereby effectively solving the problem of microwave sintering of metal powder, achieving the effects of high temperature rise speed, short sintering time and low energy consumption, and the sintered product shows better microstructure and performance, and the efficiency and quality of metal powder microwave sintering are greatly improved.
Description of the drawings:
fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 is a schematic structural view of the middle heat-insulating wave-transmitting cavity of the present invention;
FIG. 3 is a schematic diagram of a microwave composite sintering device for metal powder molding.
The specific implementation mode is as follows:
the present invention will be further described with reference to the following specific embodiments and accompanying drawings.
FIG. 3 shows a schematic diagram of a microwave composite sintering device for metal powder molding, wherein the microwave source is 1-4 industrial magnetrons with 3KW, the main frequency is 2450 MHz, and the power is continuously adjustable between 0-12 KW. The microwave transmission and measurement system in the metal powder molding microwave composite sintering equipment comprises a plurality of devices, mainly including a microwave generator 101, a circulator 102, a water load 103, a waveguide 104, a directional coupler 105, an impedance tuner 106, a heating cavity 107 and the like, but the functions of each device are different. The waveguide tube is a square copper tube and plays a role in transmitting microwaves. The circulator is used for transmitting the reflected microwave generated when the load is seriously mismatched to the water load, thereby protecting the microwave generator. The directional coupler may attenuate the microwave signal from the waveguide and detect it with a microammeter to monitor the matching of the load and the absorption of microwave energy by the material, and detect forward and reverse power. The impedance matcher is a device for achieving the best matching state of the system, and can be adjusted within a certain range. The heating cavity is the core part of the whole system and can be a travelling wave cavity, a mixing cavity, a multi-cavity, a single-cavity and the like. Compared with other cavities, the multi-cavity microwave heater has a simple mechanical structure and can be suitable for various heating loads, wherein the multi-cavity microwave heater is the most widely applied microwave heater. Generally speaking, a multiple cavity heater is a device that couples microwaves of a given power from a microwave source to a sealed metal enclosure that is configured and dimensioned according to a theoretical approach to have a length of several wavelengths in at least two directions, and that maintains a plurality of resonant modes in a given frequency band within the enclosure. The main problem with multiple cavities is that the electromagnetic field strength in the local region is not as high as that of a single cavity, and thus the rate of temperature rise of the heated cavity is slower.
Referring to fig. 1 and 2, a heating cavity for a metal powder molding microwave composite sintering device is disclosed, which comprises: the microwave cavity comprises a microwave cavity 1, a carrier 2 arranged inside the microwave cavity 1, a heat-insulating wave-transmitting cavity 3 arranged on the carrier 2, a waveguide tube 4 arranged on the microwave cavity 1 and used for heating, and a sintering support plate 5 arranged inside the heat-insulating wave-transmitting cavity 3 and used for bearing a metal powder green blank 7, wherein a plurality of wave-absorbing auxiliary heating layers 6 which are uniformly distributed are arranged inside the heat-insulating wave-transmitting cavity 3, and a gap is formed between every two adjacent wave-absorbing auxiliary heating layers 6. The utility model is in operation, the wave guide tube 4 conducts microwave, the microwave heats the gas in the microwave cavity 1, the heated gas heats the heat insulation wave-transmitting cavity 3, and the microwave can also penetrate the heat insulation wave-transmitting cavity 3 to heat the metal powder blank 7 in the heat insulation wave-transmitting cavity 3, because the microwave heating efficiency is low under the low temperature of the metal powder, the microwave heating efficiency of the microwave-absorbing auxiliary heating layer 6 arranged in the microwave cavity 1 is high under the low temperature, the temperature in the heat insulation wave-transmitting cavity 3 is rapidly increased, so that the metal powder blank 7 can be radiated and heated to realize the auxiliary heating, the composite heating function is achieved, thereby the microwave sintering problem of the metal powder is effectively solved, the effects of high temperature-increasing speed, short sintering time and low energy consumption are achieved, and the sintered product shows better microstructure and performance, greatly improving the efficiency and quality of the microwave sintering of the metal powder.
The heat-insulating wave-transmitting cavity 3 comprises a wave-transmitting temperature-resistant ceramic ring body 31 with a circular ring-shaped cross section, a bottom plate 32 arranged at the lower end of the wave-transmitting temperature-resistant ceramic ring body 31 and a cover plate 33 arranged at the upper end of the wave-transmitting temperature-resistant ceramic ring body 31, and the wave-absorbing auxiliary heating layer 6 is arranged on the inner wall of the wave-transmitting temperature-resistant ceramic ring body 31. The area of the wave-absorbing auxiliary heating layer 6 accounts for 1/2-1/3 of the area of the inner wall of the wave-transmitting temperature-resistant ceramic ring body 31. In a preferred embodiment, the area of the wave-absorbing auxiliary heating layer 6 occupies 1/2 of the inner wall area of the wave-transparent temperature-resistant ceramic ring body 31.
The thickness of the wave-absorbing auxiliary heating layer 6 is 2-10 mm; the thickness of the wave-transparent temperature-resistant ceramic ring body 31 is 10-35 mm.
The wave-absorbing auxiliary heating layer 6 is a silicon carbide coating fixed on the inner wall of the wave-transmitting and temperature-resistant ceramic ring body 31 in a coating mode, and the silicon carbide coating and the wave-transmitting and temperature-resistant ceramic ring body 31 form a whole, so that the purpose of integrating a heat-insulating wave-transmitting material and an auxiliary heating material is achieved, and the silicon carbide coating is more convenient to use. Of course, the wave-absorbing auxiliary heating layer 6 can also be another silicon carbide material layer.
The carrier 2 is fixed inside the microwave cavity 1. Or, the lower end of the carrier 2 is provided with a rotating shaft 21, the lower end of the rotating shaft 21 penetrates through the lower end of the microwave cavity 1 and is connected with a rotation driving device, so that the carrier 2 is rotatably installed inside the microwave cavity 1, at this time, the microwave cavity 1 and the metal powder green blank inside the microwave cavity rotate along with the rotation of the carrier 2, so that the heating is more uniform, and the efficiency and the quality of the metal powder microwave sintering are further improved.
Microwave cavity 1 is the stainless steel tank body, is provided with cooling water passageway 11 in this stainless steel tank body intermediate layer, accomplishes the heating work back in the later stage, lets in the cooling water through this cooling water passageway 11 in order to realize cooling down the stainless steel tank body fast, guarantees the quality of sintered product.
An observation window 12, an air inlet 15, an exhaust pipeline 13 and a temperature measuring instrument 14 are arranged on the microwave cavity 1, and the temperature measuring instrument 14 extends into the heat-insulating wave-transmitting cavity 3.
The inventors performed the following three tests, specifically as follows:
in the first test, when the wave-transparent temperature-resistant ceramic ring body 31 has no wave-absorbing auxiliary heating layer, the temperature of the iron powder blank is raised to 600 ℃ from normal temperature, and the time is taken for 125 minutes.
In the second test, when the duty ratio of the wave-absorbing auxiliary heating layer in the wave-transparent temperature-resistant ceramic ring body 31 is 1/2, namely the wave-transparent temperature-resistant ceramic ring body 31 occupies a half of the inner surface area, the temperature of the iron powder blank is raised to 600 ℃ from the normal temperature, and the time is taken for 28 minutes.
And in the third test, when the duty ratio of the wave-absorbing auxiliary heating layer in the wave-transparent temperature-resistant ceramic ring body 31 is 1/3, namely the wave-transparent temperature-resistant ceramic ring body 31 occupies the area of 1/3 on the inner surface, the temperature of the iron powder blank is raised to 600 ℃ from normal temperature, and the time is consumed for 33 minutes.
The experiment proves that the wave-absorbing auxiliary heating layer is additionally arranged in the wave-transparent temperature-resistant ceramic ring body 31, the working time can be greatly reduced, the working efficiency is improved, and the effect is better when the duty ratio of the wave-absorbing auxiliary heating layer in the wave-transparent temperature-resistant ceramic ring body 31 is 1/2.
To sum up, in the operation of the present invention, the waveguide tube 4 conducts the microwave, the microwave heats the gas inside the microwave cavity 1, the heated gas heats the heat-insulating wave-transmitting cavity 3, and the microwave can also penetrate through the heat-insulating wave-transmitting cavity 3 to heat the metal powder green blank inside the heat-insulating wave-transmitting cavity 3, because the microwave heating efficiency is low at the low temperature of the metal powder, the microwave-absorbing auxiliary heating layer 6 disposed inside the microwave cavity 1 has high microwave heating efficiency at the low temperature, so that the temperature inside the heat-insulating wave-transmitting cavity 3 can be rapidly raised, and the metal powder green blank can be subjected to radiant heating to realize auxiliary heating, thereby achieving the composite heating function, thereby effectively solving the microwave sintering problem of the metal powder, so as to achieve the effects of fast temperature rise, short sintering time, low energy consumption, and the sintered product shows better microstructure and performance, greatly improving the efficiency and quality of the microwave sintering of the metal powder.
Of course, the above description is only an exemplary embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes and modifications made by the constructions, features, and principles of the present invention in accordance with the claims of the present invention are intended to be included in the scope of the present invention.
Claims (10)
1. The heating cavity for the metal powder molding microwave composite sintering equipment is characterized in that: it includes: the microwave cavity comprises a microwave cavity (1), a carrier (2) arranged inside the microwave cavity (1), a heat-insulating wave-transmitting cavity (3) arranged on the carrier (2), a waveguide tube (4) arranged on the microwave cavity (1) and used for heating, and a sintering support plate (5) arranged inside the heat-insulating wave-transmitting cavity (3) and used for bearing a metal powder green body, wherein a plurality of wave-absorbing auxiliary heating layers (6) which are uniformly distributed are arranged inside the heat-insulating wave-transmitting cavity (3), and a gap is formed between every two adjacent wave-absorbing auxiliary heating layers (6).
2. The heating cavity for the metal powder forming microwave composite sintering equipment as claimed in claim 1, wherein: the heat-insulation wave-transparent cavity (3) comprises a wave-transparent temperature-resistant ceramic ring body (31) with a circular ring-shaped cross section, a bottom plate (32) arranged at the lower end of the wave-transparent temperature-resistant ceramic ring body (31) and a cover plate (33) arranged at the upper end of the wave-transparent temperature-resistant ceramic ring body (31), and the wave-absorbing auxiliary heating layer (6) is arranged on the inner wall of the wave-transparent temperature-resistant ceramic ring body (31).
3. The heating cavity for the metal powder forming microwave composite sintering equipment as claimed in claim 2, wherein: the area of the wave-absorbing auxiliary heating layer (6) accounts for 1/2-1/3 of the area of the inner wall of the wave-transmitting temperature-resistant ceramic ring body (31).
4. The heating cavity for the metal powder forming microwave composite sintering equipment as claimed in claim 3, wherein: the area of the wave-absorbing auxiliary heating layer (6) accounts for 1/2 of the area of the inner wall of the wave-transmitting temperature-resistant ceramic ring body (31).
5. The heating cavity for the metal powder forming microwave composite sintering equipment as claimed in claim 3, wherein: the thickness of the wave-absorbing auxiliary heating layer (6) is 2-10 mm; the thickness of the wave-transparent temperature-resistant ceramic ring body (31) is 10-35 mm.
6. The heating cavity for the metal powder forming microwave composite sintering equipment as claimed in any one of claims 2 to 5, wherein: the wave-absorbing auxiliary heating layer (6) is a silicon carbide coating fixed on the inner wall of the wave-transparent temperature-resistant ceramic ring body (31) in a coating mode, and the wave-absorbing auxiliary heating layer and the wave-transparent temperature-resistant ceramic ring body (31) form a whole.
7. The heating cavity for the metal powder forming microwave composite sintering equipment as claimed in claim 6, wherein: the carrier (2) is fixed inside the microwave cavity (1).
8. The heating cavity for the metal powder forming microwave composite sintering equipment as claimed in claim 6, wherein: the lower end of the carrier (2) is provided with a rotating shaft (21), and the lower end of the rotating shaft (21) penetrates through the lower end of the microwave cavity (1) and is connected with a rotation driving device, so that the carrier (2) can be rotatably arranged in the microwave cavity (1).
9. The heating cavity for the metal powder forming microwave composite sintering equipment as claimed in claim 6, wherein: the microwave cavity (1) is a stainless steel tank body, and a cooling water channel (11) is arranged in an interlayer of the stainless steel tank body.
10. The heating cavity for the metal powder forming microwave composite sintering equipment as claimed in claim 6, wherein: an observation window (12), an air inlet (15), an exhaust pipeline (13) and a temperature measuring instrument (14) are arranged on the microwave cavity (1), and the temperature measuring instrument (14) extends into the heat-insulating wave-transmitting cavity (3).
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| CN201921478422.4U CN210952312U (en) | 2019-09-05 | 2019-09-05 | Heating cavity for metal powder forming microwave composite sintering equipment |
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| CN201921478422.4U CN210952312U (en) | 2019-09-05 | 2019-09-05 | Heating cavity for metal powder forming microwave composite sintering equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113894246A (en) * | 2021-09-14 | 2022-01-07 | 中车戚墅堰机车车辆工艺研究所有限公司 | 3D printing precoated sand rapid microwave curing equipment and curing method thereof |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113894246A (en) * | 2021-09-14 | 2022-01-07 | 中车戚墅堰机车车辆工艺研究所有限公司 | 3D printing precoated sand rapid microwave curing equipment and curing method thereof |
| CN113894246B (en) * | 2021-09-14 | 2023-03-10 | 中车戚墅堰机车车辆工艺研究所有限公司 | 3D printing precoated sand rapid microwave curing equipment and curing method thereof |
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Effective date of registration: 20201228 Address after: 523000 Ou Deng Li Chi Di, Gaopo Town, Dongguan City, Guangdong Province Patentee after: DONGGUAN ZHANSHENG MOLD Co.,Ltd. Address before: 523000 building e, Lianshang Zhizao Industrial Park, Chuangxing Road, Xiaoyong village, Gaopo Town, Dongguan City, Guangdong Province Patentee before: DONGGUAN YUANLI WUXIAN PRINTING TECHNOLOGY Co.,Ltd. |
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