CN214684268U - High-temperature rapid hot-pressing vacuum direct-current sintering device - Google Patents
High-temperature rapid hot-pressing vacuum direct-current sintering device Download PDFInfo
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- CN214684268U CN214684268U CN202120445449.4U CN202120445449U CN214684268U CN 214684268 U CN214684268 U CN 214684268U CN 202120445449 U CN202120445449 U CN 202120445449U CN 214684268 U CN214684268 U CN 214684268U
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- graphite
- pressure head
- pressing
- temperature rapid
- power supply
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- 238000005245 sintering Methods 0.000 title claims abstract description 37
- 238000007731 hot pressing Methods 0.000 title claims abstract description 26
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 78
- 239000010439 graphite Substances 0.000 claims abstract description 78
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 75
- 238000003825 pressing Methods 0.000 claims description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 abstract description 12
- 238000000465 moulding Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910052580 B4C Inorganic materials 0.000 description 1
- 229910052582 BN Inorganic materials 0.000 description 1
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 1
- 229910016006 MoSi Inorganic materials 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910018487 Ni—Cr Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 description 1
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
- 229910003465 moissanite Inorganic materials 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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Abstract
A high-temperature rapid hot-pressing vacuum direct-current sintering device is characterized in that an upper end and a lower end of a graphite mold (3) are respectively provided with a graphite upper pressure head (1) and a graphite lower pressure head (6), the graphite mold (3) is arranged in a vacuum chamber (5), and the graphite upper pressure head (1) and the graphite lower pressure head (6) are respectively connected with a direct-current power supply (4). Direct current directly generates heat through the graphite mold, the heat efficiency is high, the heating speed is high, the rapid sintering molding of a sample can be realized, and the problem that the heat-generating body is required to conduct heat in a convection mode in common hot-pressing sintering is solved. The graphite mold replaces a pulse power supply, and is directly electrified and heated in the graphite mold through a direct current power supply, so that the efficiency is high, and the industrialization is facilitated.
Description
Technical Field
The utility model relates to a sintering device's of vacuum hot pressing equipment institutional advancement technique, especially high temperature quick hot pressing vacuum direct current sintering device.
Background
Hot press sintering is a sintering method in which dry powder is filled into a mold, and then pressure and heat are applied from a uniaxial direction to complete molding and sintering at the same time. The characteristics of hot-pressing sintering: because the hot-pressing sintering is carried out simultaneously by heating and pressurizing, the powder is in a thermoplastic state, which is beneficial to the contact diffusion of particles and the process of flow mass transfer, and the forming pressure is only cold-pressed 1/10; but also can reduce the sintering temperature and shorten the sintering time, thereby resisting the growth of crystal grains and obtaining products with fine crystal grains, high density and good mechanical and electrical properties. The ceramic product with ultrahigh purity can be produced without adding sintering aids or molding aids. The hot-pressing sintering has the defects of complex process and equipment, strict production control requirement, high requirement on die materials, high energy consumption, lower production efficiency and high production cost. Examples of using hot pressing as a means for manufacturing a product are: alumina, ferrite, boron carbide, boron nitride and other engineering ceramics.
Hot-pressing equipment: the common hot press mainly comprises a heating furnace, a pressurizing device, a die and a temperature and pressure measuring device. The heating furnace uses electricity as a heat source, and heating elements comprise SiC, MoSi or nickel-chromium wires, platinum wires, molybdenum wires and the like. The pressure atmosphere may be air or a reducing atmosphere or an inert atmosphere, depending on the requirements of the material properties. According to the sintering characteristics of the product, thermal alloy steel, graphite, silicon carbide, alumina, zirconia, metal ceramics and the like can be selected. Graphite molds are most widely used.
The existing rapid hot-pressing sintering technology mainly comprises the following steps:
(1) the common hot-pressing sintering technology: after the furnace body heating body heats, the heat is transferred to the die in a convection heat transfer mode, the heat transfer efficiency is high, and the heating speed is low.
(2) Pulsed plasma sintering technique (SPS): the graphite mold is directly electrified and heated by the pulse power supply, and although the efficiency is high, the pulse power supply is expensive and difficult to industrialize.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a high temperature quick hot pressing vacuum direct current sintering device generates heat through the direct circular telegram of DC power supply in graphite jig, and is efficient, does benefit to the industrialization.
The purpose of the utility model is realized by the following technical measures: the upper end and the lower end of the graphite mould are respectively provided with an upper graphite pressure head and a lower graphite pressure head, the graphite mould is arranged in the vacuum chamber, and the upper graphite pressure head and the lower graphite pressure head are respectively connected with a direct current power supply.
Particularly, the graphite upper pressure head and the graphite lower pressure head are respectively connected with a direct current power supply through copper plate wires.
In particular, the graphite upper pressure head and the graphite lower pressure head are coaxially arranged in the frame. The graphite upper pressure head and the graphite lower pressure head are coaxially arranged with the press through the frame. Alternatively, the press is mounted outside the frame.
In particular, the dc power supply is installed outside the vacuum chamber.
Particularly, one of the graphite upper pressure head or the graphite lower pressure head is of a fixed structure, and the other is of an axial moving structure.
In particular, the vacuum chamber is connected to a vacuum pump.
The utility model discloses an advantage and effect: direct current directly generates heat through the graphite mold, the heat efficiency is high, the heating speed is high, the rapid sintering molding of a sample can be realized, and the problem that the heat-generating body is required to conduct heat in a convection mode in common hot-pressing sintering is solved.
Drawings
Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention.
The reference numerals include:
1-graphite upper pressure head, 2-copper plate wire, 3-graphite die, 4-DC power supply, 5-vacuum chamber, 6-graphite lower pressure head, 7-press and 8-frame.
Detailed Description
The utility model discloses the principle lies in, and direct current replaces current pulse power supply, directly generates heat through graphite jig, though its effect works as with pulse power supply sound, and it is expensive to solve pulse power supply cost, is difficult to the bottleneck of localization. However, the pressurizing device of the vacuum sintering technology requires a gentle speed, constant pressure maintaining, flexible pressure adjustment, lever type and hydraulic type. Meanwhile, the mold is required to have high strength, high temperature resistance, oxidation resistance and no adhesion with the hot-pressing material, and the thermal expansion coefficient of the mold is consistent with or similar to that of the hot-pressing material. Therefore, the utility model discloses still need to improve auxiliary structure such as pressure device.
The utility model is suitable for a high temperature vacuum sintering of pottery, metal and carbide etc. equips the field.
The present invention will be further explained with reference to the drawings and examples.
Example 1: as shown in the attached figure 1, the high-temperature rapid hot-pressing vacuum direct-current sintering device is characterized in that an upper graphite pressure head 1 and a lower graphite pressure head 6 are respectively installed at the upper end and the lower end of a graphite mold 3, the graphite mold 3 is installed in a vacuum chamber 5, and the upper graphite pressure head 1 and the lower graphite pressure head 6 are respectively connected with a direct-current power supply 4.
In the foregoing, the graphite upper pressing head 1 and the graphite lower pressing head 6 are respectively connected to the dc power supply 4 through the copper plate wires 2.
In the foregoing, the graphite upper ram 1 and the graphite lower ram 6 are coaxially installed in the frame 8. The graphite upper pressure head 1 and the graphite lower pressure head 6 are coaxially arranged with the press 7 through a frame 8. Alternatively, the press 7 is mounted outside the frame 8.
In the foregoing, the dc power supply 4 is installed outside the vacuum chamber 5.
The embodiment of the utility model provides an in, press 7 is in the outer layer of whole device, and pressure head 6 realizes 3 inside one-way pressing pressure or atmosphere sintering to graphite jig through pressure head 1, graphite down on the graphite.
The embodiment of the utility model provides an in, DC power supply 4 is connected through pressure head 6 under pressure head 1, the graphite on copper wire 2 and the graphite, realizes that direct current from the graphite pressure head 1, graphite jig 3 and graphite down the pressure head 6 pass through, and the direct resistance generates heat in graphite jig 3.
In the embodiment of the utility model, the powder is loaded in the graphite mould 3, the graphite mould 3 is arranged between the graphite upper pressure head 1 and the graphite lower pressure head 6, and the contact of the graphite upper pressure head 1, the graphite mould 3 and the graphite lower pressure head 6 is realized; closing the vacuum chamber 5, and vacuumizing and/or inflating the atmosphere gas according to the preset vacuum degree; the press 7 pressure and heating rate and sintering temperature are predetermined, and the direct current power supply and pressure perform pressing and current heating according to the instructions. In the pressing and heating processes, the graphite upper pressing head 1, the graphite mold 3 and the graphite lower pressing head 6 simultaneously play a role in pressing and heating. And after sintering is finished, the direct-current power supply 4 is closed, the press 7 stops working, the vacuum chamber 5 is opened after cooling, and the graphite mold 3 and the sample are taken out.
Claims (8)
1. The high-temperature rapid hot-pressing vacuum direct-current sintering device is characterized in that an upper end and a lower end of a graphite mold (3) are respectively provided with an upper graphite pressure head (1) and a lower graphite pressure head (6), the graphite mold (3) is arranged in a vacuum chamber (5), and the upper graphite pressure head (1) and the lower graphite pressure head (6) are respectively connected with a direct-current power supply (4).
2. A high-temperature rapid hot-pressing vacuum direct-current sintering device as claimed in claim 1, wherein the graphite upper pressing head (1) and the graphite lower pressing head (6) are respectively connected with the direct-current power supply (4) through copper plate wires (2).
3. A high temperature rapid hot pressing vacuum direct current sintering device according to claim 1, characterized in that the graphite upper ram (1) and the graphite lower ram (6) are coaxially mounted in the frame (8).
4. A high temperature rapid hot pressing vacuum dc sintering apparatus according to claim 1, wherein the dc power supply (4) is installed outside the vacuum chamber (5).
5. A high temperature rapid hot pressing vacuum direct current sintering device as claimed in claim 1, characterized in that one of the graphite upper pressure head (1) or the graphite lower pressure head (6) is a fixed structure, and the other is an axial moving structure.
6. A high temperature rapid hot pressing vacuum direct current sintering device according to claim 1, characterized in that the vacuum chamber (5) is connected with a vacuum pump.
7. A high temperature rapid hot pressing vacuum direct current sintering device according to claim 3, characterized in that the graphite upper ram (1) and the graphite lower ram (6) are coaxially mounted with the press (7) through the frame (8).
8. A high temperature rapid hot pressing vacuum direct current sintering device according to claim 3, characterized in that a press (7) is installed outside the frame (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120445449.4U CN214684268U (en) | 2021-03-01 | 2021-03-01 | High-temperature rapid hot-pressing vacuum direct-current sintering device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120445449.4U CN214684268U (en) | 2021-03-01 | 2021-03-01 | High-temperature rapid hot-pressing vacuum direct-current sintering device |
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| CN214684268U true CN214684268U (en) | 2021-11-12 |
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| CN202120445449.4U Active CN214684268U (en) | 2021-03-01 | 2021-03-01 | High-temperature rapid hot-pressing vacuum direct-current sintering device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114388166A (en) * | 2021-12-31 | 2022-04-22 | 中国科学院上海应用物理研究所 | A method for solidifying chlorine and/or fluorine-containing radioactive waste by glass ceramics and glass ceramic solidified body obtained therefrom |
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2021
- 2021-03-01 CN CN202120445449.4U patent/CN214684268U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114388166A (en) * | 2021-12-31 | 2022-04-22 | 中国科学院上海应用物理研究所 | A method for solidifying chlorine and/or fluorine-containing radioactive waste by glass ceramics and glass ceramic solidified body obtained therefrom |
| CN114388166B (en) * | 2021-12-31 | 2025-03-07 | 中国科学院上海应用物理研究所 | A method for solidifying chlorine and/or fluorine-containing radioactive waste by glass ceramics and a glass ceramic solidified body obtained thereby |
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