CN114322566A - High-temperature vacuum graphite sintering furnace - Google Patents
High-temperature vacuum graphite sintering furnace Download PDFInfo
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- CN114322566A CN114322566A CN202210000262.2A CN202210000262A CN114322566A CN 114322566 A CN114322566 A CN 114322566A CN 202210000262 A CN202210000262 A CN 202210000262A CN 114322566 A CN114322566 A CN 114322566A
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- heat shield
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- temperature vacuum
- circulating
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- 238000005245 sintering Methods 0.000 title claims abstract description 53
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 37
- 239000010439 graphite Substances 0.000 title claims abstract description 37
- 238000001816 cooling Methods 0.000 claims abstract description 92
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims abstract description 13
- 235000017491 Bambusa tulda Nutrition 0.000 claims abstract description 13
- 241001330002 Bambuseae Species 0.000 claims abstract description 13
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims abstract description 13
- 239000011425 bamboo Substances 0.000 claims abstract description 13
- 238000000926 separation method Methods 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 238000005192 partition Methods 0.000 claims description 10
- 238000002791 soaking Methods 0.000 abstract description 5
- 238000004904 shortening Methods 0.000 abstract description 4
- 230000002349 favourable effect Effects 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 32
- 238000009413 insulation Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
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Abstract
The invention provides a high-temperature vacuum graphite sintering furnace, and belongs to the technical field of vacuum sintering equipment. This temperature vacuum graphite fritting furnace includes a furnace section of thick bamboo and sets up the bell at a furnace section of thick bamboo both ends, be provided with the heat shield main part in the furnace section of thick bamboo, the bell inboard is provided with heat shield end cover subassembly, heat shield end cover subassembly includes preceding screen, slide rail and driving piece, the slide rail is fixed to be set up on the furnace cover, preceding screen slides and sets up on the slide rail, the screen before the output of driving piece is connected, when the bell lid fits a furnace section of thick bamboo, the driving piece can drive the lid fit the preceding screen and the separation of heat shield main part of the tip of heat shield main part. After the sintering is accomplished, naturally cool down to suitable temperature after, the driving piece is shielded forward and is applyed a power of keeping away from the tip of heat shield main part for preceding shield and heat shield main part separation form the gas exchange passageway, accelerate the cooling rate in the soaking zone in the heat shield, thereby be favorable to shortening the cooling time, accelerate cooling rate.
Description
Technical Field
The invention belongs to the technical field of vacuum sintering equipment, and particularly relates to a high-temperature vacuum graphite sintering furnace.
Background
The vacuum graphite sintering furnace is equipment for sintering a hard alloy cutter head and various metal powder pressed bodies at high temperature or ultrahigh temperature (the temperature reaches more than 2600 ℃) in a vacuum environment or under a protective atmosphere, and mainly comprises an electric furnace body, a vacuum system, a water cooling system and the like. For example, chinese patent No. 201911388388.6 discloses a heat shield isolated ultra-high temperature vacuum sintering furnace, which comprises a furnace tube, and a heater, a heat shield, a cooling member and an isolating member arranged in the furnace tube.
In the prior art, in order to facilitate operation and better heat insulation, two ends of a heat shield are fixed on a furnace cover of a furnace cylinder, and after the furnace cover is closed, two ends of the heat shield and a heat shield main body surround to form a closed heat insulation cavity. However, the actual working temperature of the vacuum sintering furnace exceeds 2000 ℃, even can reach 2600 ℃, and after sintering is finished, the temperature needs to be naturally reduced to about 600 ℃, and then the temperature is continuously reduced through internal gas phase circulation. In the cooling process, under the obstruction of the heat shield, the cooling rate in the heat insulation cavity is slow, and the whole cooling period needs to last for 3-4 days.
Disclosure of Invention
Based on the technical scheme, the invention provides a high-temperature vacuum graphite sintering furnace, which aims to solve the technical problem that the cooling rate of the vacuum sintering furnace is slow in the prior art.
The utility model provides a high temperature vacuum graphite fritting furnace, is in including a furnace section of thick bamboo and setting the bell at furnace section of thick bamboo both ends, be provided with the heat shield main part in the furnace section of thick bamboo, the bell inboard is provided with heat shield end cover subassembly, heat shield end cover subassembly includes preceding screen, slide rail and driving piece, the slide rail is fixed to be set up on the bell, preceding screen slide set up in on the slide rail, the output of driving piece is connected preceding screen, works as the bell lid fits during the furnace section of thick bamboo, the driving piece can drive the lid fit the tip of heat shield main part preceding screen with the separation of heat shield main part.
Preferably, the slide rail is perpendicular to the cross-sectional direction of bell, the side of front screen is provided with the slip ear, slip ear slidable mounting in on the slide rail, the driving piece sets up the rear end of front screen to the pulling front screen is followed the slide rail slides.
Preferably, a circulating cooling cavity is formed between the heat shield main body and the furnace barrel, a partition plate is arranged in the middle of the circulating cooling cavity, and the circulating cooling cavity is divided into an air inlet cavity and an air outlet cavity by the partition plate; the high-temperature vacuum graphite sintering furnace further comprises a cooling circulating fan, wherein a circulating inlet pipe fitting is arranged at the inlet end of the cooling circulating fan, a circulating outlet pipe fitting is arranged at the outlet end of the cooling circulating fan, the circulating inlet pipe fitting is communicated with the gas outlet cavity, and the circulating outlet pipe fitting is communicated with the gas inlet cavity.
Preferably, the circulation inlet pipe and/or the circulation outlet pipe are provided on the outside with a cooling jacket into which a refrigerant can be introduced.
Preferably, the cooling jackets are arranged in sections.
Preferably, a first cut-off valve is arranged on the circulating inlet pipe fitting or the circulating outlet pipe fitting, a connecting pipe is arranged in front of the valve of the first cut-off valve, and a second cut-off valve is arranged on the connecting pipe; and the other end of the connecting pipe is connected with a Roots blower.
Preferably, the inlet end of the Roots blower is communicated with the heat shield main body.
Preferably, the other end of the connecting pipe is positioned in front of the Roots blower and is also provided with a dewaxing device; the gas inlet end of the dewaxing device is connected with the connecting pipe, and the gas outlet end of the dewaxing device is connected with the inlet of the Roots blower.
Preferably, the cooling circulating fan comprises a motor, a radiator and a water cooling cavity arranged at the inlet end of the radiator, and a water cooling coil is arranged in the water cooling cavity or on the periphery of the water cooling cavity.
Preferably, the driving member can drive the front screen to linearly displace 1cm-5 cm.
Compared with the prior art, the invention has at least the following advantages:
set up the heat shield end cover subassembly including preceding screen, slide rail and driving piece on the bell, work as the bell lid fits during the stove section of thick bamboo, the driving piece can drive the lid fits the tip of heat shield main part preceding screen with the separation of heat shield main part. And during high-temperature sintering, the driving piece applies a force close to the end part of the heat shield main body to the front shield, so that the sealing performance between the front shield and the heat shield main body is improved. After the sintering is accomplished, naturally cool down to suitable temperature after, the driving piece to the front shield is applyed one and is kept away from the power of the tip of heat shield main part makes the front shield with the separation of heat shield main part forms gas exchange channel, accelerates the cooling rate in soaking district in the heat shield to be favorable to shortening the cooling time, accelerate cooling rate.
Drawings
FIG. 1 is a front view of a high temperature vacuum graphite sintering furnace according to one embodiment.
FIG. 2 is a schematic cross-sectional view of a high temperature vacuum graphite sintering furnace according to an embodiment.
FIG. 3 is a schematic cross-sectional view of a high temperature vacuum graphite sintering furnace according to an embodiment.
FIG. 4 is a schematic view of the operation of the high temperature vacuum graphite sintering furnace according to an embodiment.
In the figure: the high-temperature vacuum graphite sintering furnace comprises a high-temperature vacuum graphite sintering furnace 10, a furnace cylinder 100, a furnace cover 200, a heat shield main body 300, a heat shield end cover assembly 400, a front shield 410, a sliding lug 411, a sliding rail 420, a driving piece 430, a circulating cooling cavity 500, an air inlet cavity 510, an air outlet cavity 520, a partition plate 600, a cooling circulating fan 700, a motor 701, a radiator 702, a water cooling cavity 703, a water cooling coil 704, a circulating inlet pipe 710, a circulating outlet pipe 720, a cooling jacket 730, a first cut-off valve 740, a connecting pipe 750, a second cut-off valve 760, a Roots fan 770 and a dewaxing device 780.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The technical solutions of the present invention will be further described below with reference to the accompanying drawings of the embodiments of the present invention, and the present invention is not limited to the following specific embodiments.
It should be understood that the same or similar reference numerals in the drawings of the embodiments correspond to the same or similar parts. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right", "top", "bottom", etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the drawings, it is only for convenience of description and simplicity of description, but does not indicate or imply that the equipment or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationships in the drawings are only used for illustrative purposes and are not to be construed as limiting the patent, and the specific meanings of the terms will be understood by those skilled in the art according to specific situations.
Referring to fig. 1 to 3, in a specific embodiment, a high temperature vacuum graphite sintering furnace 10 includes a furnace cylinder 100 and furnace covers 200 disposed at two ends of the furnace cylinder 100, a heat shield main body 300 is disposed in the furnace cylinder 200, a heat shield end cover assembly 400 is disposed inside the furnace covers 200, the heat shield end cover assembly 400 includes a front screen 410, a slide rail 420 and a driving member 430, the slide rail 420 is fixedly disposed on the furnace cover 200, the front screen 410 is slidably disposed on the slide rail 420, an output end of the driving member 430 is connected to the front screen 410, and when the furnace cover 200 is covered on the furnace cylinder 100, the driving member 430 can drive the front screen 410 covering an end portion of the heat shield main body 300 to be separated from the heat shield main body 300.
Specifically, the furnace cover 200 can cover both sides of the furnace tube 100 to form a closed sintering space. The heat shield main body 300 is disposed in the furnace tube 100, a soaking zone for high-temperature sintering is formed inside the heat shield main body 300, and a low-temperature zone (hereinafter referred to as a circulating cooling chamber 500) is formed between the heat shield main body 300 and the furnace tube 100. Generally, when the furnace cover 200 is covered on the furnace cylinder 100, the front screen 410 is covered on the end of the heat shield main body 300 to ensure the tightness of the heat shield main body 300. In the present invention, the heat shield end cap assembly 400 including the front shield 410, the slide rail 420 and the driving member 430 is disposed on the furnace cover 200, and when sintering at a high temperature, the driving member 430 applies a force to the front shield 410, the force being close to the end of the heat shield main body 300, thereby improving the sealing performance between the front shield 410 and the heat shield main body 300. After the sintering is accomplished, naturally cool down to suitable temperature after (generally, for avoiding high-temperature gas to damage outside pipe fitting, will the temperature in soaking district reduces to below 600 ℃, opens the gas cycle cooling), driving piece 430 to preceding screen 410 applys one and keeps away from the power of the tip of heat shield main part 300 makes preceding screen 410 with heat shield main part 300 separates, forms the gas exchange passageway, accelerates the cooling rate in soaking district in the heat shield main part 300 to be favorable to shortening the cooling time, accelerate cooling rate. Practice shows that when only the heat shield end cover assembly 400 is arranged, the cooling period of the high-temperature vacuum graphite sintering furnace 10 is shortened to be within 72 hours.
For example, the slide rail 420 is disposed along a direction perpendicular to a cross section of the furnace cover 200, a slide lug 411 is disposed on a side surface of the front screen 410, the slide lug 411 is slidably mounted on the slide rail 420, and the driving member 430 is disposed at a rear end of the front screen 410 to pull the front screen 410 to slide along the slide rail 420. The slide rail 420 supports the front panel 410 to keep the front panel coaxial with the heat shield body 300, and guides the front panel 410 to slide along the slide rail 420 under the action of the driving member 430.
Preferably, the driving member 430 is capable of driving the front panel 410 to be linearly displaced by 1cm to 5cm, so as to ensure a large area of a gas exchange passage formed between the front panel 410 and the end of the heat shield main body 300.
In a preferred embodiment, in order to further accelerate the cooling rate of the high-temperature vacuum graphite sintering furnace 10 and shorten the cooling period, a circulating cooling cavity 500 is formed between the heat shield main body 300 and the furnace tube 100, a partition 600 is disposed in the middle of the circulating cooling cavity 500, and the circulating cooling cavity 500 is divided into an air inlet cavity 510 and an air outlet cavity 520 by the partition 600. The high-temperature vacuum graphite sintering furnace 10 further comprises a cooling circulating fan 700, wherein a circulating inlet pipe 710 is arranged at an inlet end of the cooling circulating fan 700, a circulating outlet pipe 720 is arranged at an outlet end of the cooling circulating fan 700, the circulating inlet pipe 710 is communicated with the gas outlet cavity 520, and the circulating outlet pipe 720 is communicated with the gas inlet cavity 510.
Referring to fig. 4, the partition 600 is disposed to divide the circulating cooling chamber 500 into an air inlet chamber 510 at the front end and an air outlet chamber 520 at the rear end, such that the inlet end of the cooling circulating fan 700 is communicated with the air outlet chamber 520 and the outlet end is communicated with the air inlet chamber 510. After the sintering is completed and the temperature is reduced to a suitable temperature, the driving member 430 applies a force to the front panel 410 away from the end of the heat shield body 300, so that the front panel 410 is separated from the heat shield body 300 to form a gas exchange channel. The cooling circulation fan 700 is started to extract the gas in the gas outlet cavity 520, and the gas is circulated to the gas inlet cavity 510 through the circulation outlet pipe 720. The gas in the gas inlet chamber 510 enters the heat shield body 300 from the end of the heat shield body 300 along the gas exchange path and enters the gas outlet chamber 520 along the gas exchange path at the other end of the heat shield body 300. Thus, a circulation flow of the gas phase is formed, thereby accelerating the cooling rate of the heat shield main body 300, particularly, the space in the heat shield main body 300, and further shortening the cooling period. Practice shows that under the condition that the heat shield end cover assembly 400 and the partition plate 600 are arranged at the same time, the cooling period of the high-temperature vacuum graphite sintering furnace 10 is shortened to be within 60 hours in a gas phase circulation cooling mode.
Further, a cooling jacket 730 is disposed on the outer side of the circulation inlet pipe 710 and/or the circulation outlet pipe 720, and a refrigerant can be introduced into the cooling jacket 730. Preferably, the refrigeration medium is circulating water or chilled water. In the gas phase circulation cooling process, a cooling medium is introduced into the cooling jacket 730 to cool the pipe wall of the circulation inlet pipe 710 and/or the circulation outlet pipe 720, and meanwhile, part of cold energy exchanges heat with hot circulation gas to reduce the temperature of the circulation gas and accelerate the cooling of the high-temperature vacuum graphite sintering furnace 10. Meanwhile, a refrigeration medium is introduced into the cooling jacket 730 to reduce the temperature of the pipe wall of the circulation inlet pipe 710 and/or the circulation outlet pipe 720 and protect the circulation inlet pipe 710 and/or the circulation outlet pipe 720 from high-temperature damage, so that the establishment of gas-phase circulation of the high-temperature vacuum graphite sintering furnace 10 at a higher temperature is facilitated, and the cooling period is further shortened. Practice shows that by arranging the cooling jacket 730, gas phase circulation can be established when the gas phase temperature of the high-temperature vacuum graphite sintering furnace 10 is 1000-1200 ℃, and damage to the circulation inlet pipe fitting 710 and/or the circulation outlet pipe fitting 720 is avoided, so that the cooling period of the high-temperature vacuum graphite sintering furnace 10 can be shortened to a great extent, and the cooling rate is increased. Under the condition that the heat shield end cover assembly 400 and the partition plate 600 are arranged at the same time, the cooling period of the high-temperature vacuum graphite sintering furnace 10 can be shortened to be within 48h by gas-phase circulating cooling and water-cooling of the circulating inlet pipe fitting 710 and/or the circulating outlet pipe fitting 720.
In an embodiment, the cooling circulation fan 700 includes a motor 701, a radiator 702, and a water-cooling cavity 703 disposed at an inlet end of the radiator 702, and a water-cooling coil 704 is disposed inside or outside the water-cooling cavity 703. The gas in the high-temperature vacuum graphite sintering furnace 10 firstly enters the water-cooling cavity 703 through the circulating inlet pipe 710 under the action of the back pressure of the radiator 702, and is further cooled in the water-cooling cavity 703 and then is blown into the air inlet cavity 510 through the radiator 702, so that the cooling rate is further increased, and the cooling period is shortened.
Further, the cooling jacket 730 is provided in stages for easy installation and to improve water cooling efficiency. That is, the water-cooling jacket 730 is sectionally disposed outside the circulation inlet pipe 710 and/or the circulation outlet pipe 720 with a place having a connection flange as a sectionalized position on the circulation inlet pipe 710 and/or the circulation outlet pipe 720. On one hand, the water cooling jacket 730 is convenient to manufacture and install, and on the other hand, the short-flow water cooling jacket 730 is beneficial to rapid circulation of a refrigerating medium, so that the cooling efficiency is improved.
In some embodiments, a first cut-off valve 740 is disposed on the circulation inlet pipe 710 or the circulation outlet pipe 720, a connection pipe 750 is disposed in front of the first cut-off valve 740, a second cut-off valve 760 is disposed on the connection pipe 750, and a roots blower 770 is connected to the other end of the connection pipe 750. Before sintering, the second shut-off valve 760 is opened, and the circulating cooling chamber 500 is vacuumized or replaced by inert gas through the roots blower 770.
In some embodiments, the inlet end of the roots blower 770 communicates with the heat shield body 300 to enable evacuation or inert gas replacement of the soak zone within the heat shield body 300 prior to the sintering operation.
In some embodiments, the other end of the connecting pipe 750 is located in front of the roots blower 770, and a dewaxing device 780 is further provided, wherein an air inlet end of the dewaxing device 780 is connected to the connecting pipe 750, and an air outlet end of the dewaxing device 780 is connected to an inlet of the roots blower 770. Before and after the sintering operation, the exhaust gas is first purified by the dewaxing device 780 and then discharged, thereby reducing the pollution of the sintering exhaust gas to the workshop environment.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a high temperature vacuum graphite fritting furnace, is in including a furnace section of thick bamboo and setting the bell at furnace section of thick bamboo both ends, be provided with the heat shield main part in the furnace section of thick bamboo, a serial communication port, the bell inboard is provided with heat shield end cover subassembly, heat shield end cover subassembly includes front shield, slide rail and driving piece, the slide rail is fixed to be set up on the furnace cover, the front shield slide set up in on the slide rail, the output of driving piece is connected the front shield, works as the bell lid fits during the furnace section of thick bamboo, the driving piece can drive the lid fits the tip of heat shield main part the front shield with the separation of heat shield main part.
2. The high-temperature vacuum graphite sintering furnace according to claim 1, wherein the slide rails are arranged along a cross section perpendicular to the furnace cover, the side surfaces of the front screen are provided with slide lugs, the slide lugs are slidably mounted on the slide rails, and the driving member is arranged at the rear end of the front screen to pull the front screen to slide along the slide rails.
3. The high-temperature vacuum graphite sintering furnace according to claim 1 or 2, wherein a circulating cooling cavity is formed between the heat shield main body and the furnace barrel, a partition plate is arranged in the middle of the circulating cooling cavity, and the partition plate divides the circulating cooling cavity into an air inlet cavity and an air outlet cavity;
the high-temperature vacuum graphite sintering furnace further comprises a cooling circulating fan, wherein a circulating inlet pipe fitting is arranged at the inlet end of the cooling circulating fan, a circulating outlet pipe fitting is arranged at the outlet end of the cooling circulating fan, the circulating inlet pipe fitting is communicated with the gas outlet cavity, and the circulating outlet pipe fitting is communicated with the gas inlet cavity.
4. The high-temperature vacuum graphite sintering furnace according to claim 3, wherein a cooling jacket is arranged on the outer side of the circulation inlet pipe and/or the circulation outlet pipe, and a refrigerating medium can be introduced into the cooling jacket.
5. The high temperature vacuum graphite sintering furnace of claim 4, wherein the cooling jackets are arranged in stages.
6. The high-temperature vacuum graphite sintering furnace according to claim 3, wherein a first cut-off valve is arranged on the circulation inlet pipe fitting or the circulation outlet pipe fitting, a connecting pipe is arranged in front of the valve of the first cut-off valve, and a second cut-off valve is arranged on the connecting pipe; and the other end of the connecting pipe is connected with a Roots blower.
7. The high temperature vacuum graphite sintering furnace of claim 6, wherein the inlet end of the Roots blower communicates with the heat shield body.
8. The high-temperature vacuum graphite sintering furnace according to claim 6, wherein the other end of the connecting pipe is provided with a dewaxing device before the Roots blower; the gas inlet end of the dewaxing device is connected with the connecting pipe, and the gas outlet end of the dewaxing device is connected with the inlet of the Roots blower.
9. The high-temperature vacuum graphite sintering furnace according to claim 3, wherein the cooling circulating fan comprises a motor, a radiator and a water cooling cavity arranged at the inlet end of the radiator, and a water cooling coil is arranged in or on the periphery of the water cooling cavity.
10. The high temperature vacuum graphite sintering furnace of claim 1 or 2, wherein the driving member is capable of driving the front screen to linearly displace 1cm to 5 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210000262.2A CN114322566A (en) | 2022-01-03 | 2022-01-03 | High-temperature vacuum graphite sintering furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210000262.2A CN114322566A (en) | 2022-01-03 | 2022-01-03 | High-temperature vacuum graphite sintering furnace |
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| CN114322566A true CN114322566A (en) | 2022-04-12 |
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| CN202210000262.2A Pending CN114322566A (en) | 2022-01-03 | 2022-01-03 | High-temperature vacuum graphite sintering furnace |
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