CN216745379U - Novel vacuum sintering furnace - Google Patents
Novel vacuum sintering furnace Download PDFInfo
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- CN216745379U CN216745379U CN202123123414.8U CN202123123414U CN216745379U CN 216745379 U CN216745379 U CN 216745379U CN 202123123414 U CN202123123414 U CN 202123123414U CN 216745379 U CN216745379 U CN 216745379U
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- 238000005245 sintering Methods 0.000 title claims abstract description 33
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 64
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 44
- 239000010439 graphite Substances 0.000 claims abstract description 44
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 20
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 10
- 238000005086 pumping Methods 0.000 claims description 9
- 229910052786 argon Inorganic materials 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 30
- 239000001301 oxygen Substances 0.000 abstract description 30
- 229910052760 oxygen Inorganic materials 0.000 abstract description 30
- 229910001069 Ti alloy Inorganic materials 0.000 abstract description 9
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 abstract description 7
- 239000010936 titanium Substances 0.000 abstract description 7
- 229910052719 titanium Inorganic materials 0.000 abstract description 6
- 239000007789 gas Substances 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 4
- 238000009423 ventilation Methods 0.000 abstract description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 32
- 229910052757 nitrogen Inorganic materials 0.000 description 16
- 230000004048 modification Effects 0.000 description 7
- 238000012986 modification Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000001746 injection moulding Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- OLBVUFHMDRJKTK-UHFFFAOYSA-N [N].[O] Chemical compound [N].[O] OLBVUFHMDRJKTK-UHFFFAOYSA-N 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 230000000740 bleeding effect Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- DOTMOQHOJINYBL-UHFFFAOYSA-N molecular nitrogen;molecular oxygen Chemical compound N#N.O=O DOTMOQHOJINYBL-UHFFFAOYSA-N 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001256 stainless steel alloy Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
The utility model discloses a novel vacuum sintering furnace, which comprises an outer shell, set up the carbon felt in the shell, set up the graphite case in the carbon felt, be first clearance between shell and carbon felt, be the second clearance between carbon felt and graphite case, set up first inlet channel on the shell, first inlet channel leads to the second clearance from the shell outside, set up the second inlet channel on the graphite case, the second inlet channel leads to the graphite incasement from the second clearance, set up first bleed-off passage and second bleed-off passage simultaneously on the shell, first bleed-off passage leads to the second clearance from the shell outside, the second bleed-off passage leads to the graphite incasement from the second clearance. The oxygen content is reduced by changing the evacuation and ventilation modes, the gas is directly communicated into the sintered graphite frame, the stability of the graphite frame is ensured, the requirement on the vacuum degree is reduced, the oxygen content can be controlled in an ideal range, the related performance of the titanium material is greatly improved, and the guarantee is provided for the sintering of the titanium alloy.
Description
Technical Field
The utility model relates to a vacuum sintering furnace field especially relates to a novel vacuum sintering furnace.
Background
Metal Injection Molding (MIM) is a Molding method in which a plasticized mixture of Metal powder and its binder is injected into a mold. The preparation method comprises the steps of mixing the selected powder with a binder, granulating the mixture, and then performing injection molding to obtain the required shape. For example, MIM components such as titanium alloy, pure titanium, stainless steel, and iron-nickel alloy require a vacuum sintering furnace for their production.
Titanium alloy and pure titanium have large chemical activity and are easily polluted by oxygen and nitrogen gases, the sintering process needs to be carried out in a high vacuum furnace, the performance is deteriorated due to the fact that the oxygen content is higher after the sintering of a general vacuum furnace, the vacuum degree or the oxygen and nitrogen content in the furnace cannot meet the requirement of titanium sintering, if the oxygen content of a product is increased from 0.12% to 0.30%, the fracture elongation of the product can be suddenly reduced from 20% to 3%, therefore, the existing vacuum degree and the atmosphere in the furnace can hardly meet the sintering condition of the titanium alloy, the requirement of the vacuum degree is reduced through refitting equipment, the oxygen content can be controlled within an ideal range, and the related performance of the titanium material is greatly improved.
In the existing equipment, the vacuumizing is performed from inside to outside, a sintered product is protected and sintered in a graphite frame furnace, the vacuumizing mode can volatilize oxygen, nitrogen and the like outside a carbon felt at high temperature and bring the oxygen, nitrogen and the like into the graphite frame furnace, the content of the oxygen, the nitrogen and the like is increased for the sintered product, and the sintering performance and the size of the product are unstable. Namely: the prior vacuumizing and ventilating modes can not meet the requirements of vacuum degree and oxygen content reduction, and are particularly not favorable for products such as titanium alloy and the like which have requirements on oxygen content.
Therefore, the inventor of the utility model aims to invent a novel vacuum sintering furnace aiming at the problem.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects, the utility model aims to provide a novel vacuum sintering furnace.
In order to achieve the above purpose, the utility model discloses a technical scheme is: the utility model provides a novel vacuum sintering furnace, includes the shell, set up the carbon felt in the shell, set up the graphite case in the carbon felt, and be first clearance between shell and carbon felt, be the second clearance between carbon felt and graphite case, set up first inlet channel on the shell, just first inlet channel leads to the second clearance from the shell outside, and sets up second inlet channel on the graphite case, second inlet channel leads to the graphite incasement from the second clearance, sets up first air exhaust channel and second air exhaust channel simultaneously on the shell, first air exhaust channel leads to the second clearance from the shell outside, second air exhaust channel leads to the graphite incasement from the second clearance.
Preferably, the first air inlet channel and the second air inlet channel are connected into one air inlet channel and are communicated into the graphite box from the outer side of the shell. The air inlet is ensured to be timely, and the graphite box is in stable atmosphere.
Preferably, the first pumping channel and the second pumping channel are connected into one pumping channel and are communicated into the graphite box from the outer side of the shell. The timely and effective air extraction is ensured.
Preferably, the axes of the first and second pumping channels are parallel to each other. When first bleed passage and second bleed passage separately set up promptly, the dislocation set can guarantee to bleed simultaneously to graphite incasement and second clearance department when bleeding, certainly not misplace and also can realize bleeding simultaneously, but when misplacing, the effect is better.
Preferably, the first air inlet channel and the second air inlet channel are connected to form an air inlet channel, and the first air exhaust channel and the second air exhaust channel are arranged in a staggered mode, and the axes of the first air inlet channel and the second air inlet channel are parallel to each other. The first air inlet channel and the second air inlet channel are combined into one air inlet channel, the first air exhaust channel and the second air exhaust channel are arranged in a staggered mode, the oxygen content in the furnace can be reduced, and the atmosphere of oxygen, nitrogen and the like and the atmosphere of oxygen and nitrogen can be prevented from entering the sintering furnace through controlling the pressure in the furnace.
Preferably, the first air inlet channel, the second air inlet channel, the first air exhaust channel and the second air exhaust channel are argon pipelines.
The utility model relates to a novel vacuum sintering stove's beneficial effect is, the mode through having changed to manage to find time and ventilate has reduced oxygen content, and can prevent atmospheres such as oxygen nitrogen from getting into through control stove internal pressure, through gaseous direct switch-on to the sintering graphite frame in, suction and the control stove internal pressure of passing through the pump again, make gas take out again after getting into the second clearance in the graphite frame, atmosphere such as oxygen nitrogen that has solved second clearance department brings into the sintering graphite frame again in, the stability to the graphite frame has been guaranteed, the requirement to vacuum has reduced simultaneously, oxygen content also can control the correlation performance of the titanium material that improves greatly in the scope of ideal, the sintering for titanium alloy provides the assurance.
Drawings
FIG. 1 is a schematic view of a first furnace structure of a novel vacuum sintering furnace.
FIG. 2 is a schematic view of a second furnace structure of the novel vacuum sintering furnace.
FIG. 3 is a schematic view of a third furnace structure of the novel vacuum sintering furnace.
FIG. 4 is a schematic view of a fourth furnace structure of the novel vacuum sintering furnace.
Fig. 5 is a schematic view of a conventional furnace structure.
Fig. 6 is a graph of test data using a product corresponding to fig. 1, 2 and 5.
Fig. 7 is a line graph of tensile strength corresponding to the test data.
Fig. 8 is a line graph of yield strength versus test data.
Fig. 9 is a line graph of elongation versus test data.
FIG. 10 is a graph of the oxygen content versus test data.
Fig. 11 is a line graph of nitrogen content corresponding to test data.
Fig. 12 is a density line graph corresponding to the test data.
In the figure:
1. the carbon felt heating device comprises a shell, 2, a carbon felt, 3, a graphite box, 4, a first gap, 5, a second gap, 6, a first air inlet channel, 7, a second air inlet channel, 8, a first air exhaust channel, 9 and a second air exhaust channel.
Detailed Description
The following detailed description of the preferred embodiments of the present invention will be provided in conjunction with the accompanying drawings, so as to enable those skilled in the art to more easily understand the advantages and features of the present invention, and thereby define the scope of the invention more clearly and clearly.
Referring to fig. 1-12, the novel vacuum sintering furnace in this embodiment includes a housing 1, a carbon felt 2 is disposed in the housing 1, a graphite box 3 is disposed in the carbon felt 2, a first gap 4 is disposed between the housing 1 and the carbon felt 2, a second gap 5 is disposed between the carbon felt 2 and the graphite box 3, a first air inlet channel is disposed on the housing 1, and the first air inlet channel leads to the second gap 5 from the outside of the housing 1, a second air inlet channel 7 is disposed on the graphite box 3, the second air inlet channel 7 leads to the graphite box 3 from the second gap 5, a first air exhaust channel 8 and a second air exhaust channel 9 are disposed on the housing 1, the first air exhaust channel 8 leads to the second gap 5 from the outside of the housing 1, and the second air exhaust channel 9 leads to the graphite box 3 from the second gap 5. See figure 3.
The first intake passage 6 and the second intake passage 7 are connected to form one intake passage, and lead from the outside of the housing 1 into the graphite box 3. The air inlet is ensured to be timely, and the graphite box 3 is in stable atmosphere. See figure 1.
The first air exhaust channel 8 and the second air exhaust channel 9 are connected into one air exhaust channel and communicated into the graphite box 3 from the outer side of the shell 1. The timely and effective air extraction is ensured. See figure 2.
The axes of the first pumping channel 8 and the second pumping channel 9 are parallel to each other. When first bleed passage 8 and second bleed passage 9 separately set up promptly, dislocation set has guaranteed to bleed simultaneously in the graphite box 3 and second clearance 5 department. See figure 1.
The first air inlet channel 6 and the second air inlet channel 7 are connected to form an air inlet channel, the first air exhaust channel 8 and the second air exhaust channel are arranged in a staggered mode, and the axes of the first air exhaust channel and the second air exhaust channel are parallel to each other. That is, the first air intake passage 6 and the second air intake passage 7 are combined into one air intake passage, and the first air exhaust passage 8 and the second air exhaust passage 9 are arranged in a staggered manner, so that the oxygen content in the furnace can be reduced, and the atmosphere of oxygen and nitrogen and the like and the atmosphere of oxygen and nitrogen can be prevented from entering the sintering furnace by controlling the pressure in the furnace. This is the best solution, see fig. 1.
Of course, it is also possible to combine the first intake passage and the second intake passage into one and the first bleed passage and the second bleed passage into one, see fig. 4.
And according to the practical test, the scheme corresponding to the attached figure 1 is the best scheme in the four schemes.
The first air inlet channel 6, the second air inlet channel 7, the first air exhaust channel 8 and the second air exhaust channel 9 are argon pipelines.
The novel vacuum sintering furnace has the advantages that the oxygen content is reduced by changing the evacuation and ventilation modes, the oxygen and nitrogen and other atmospheres can be prevented from entering by controlling the pressure in the furnace, the gas is directly communicated into the sintered graphite frame, the pumping force of the pump and the pressure in the furnace are controlled, the gas is pumped out after entering the second gap 5 from the graphite frame, the problem that the oxygen and nitrogen and other atmospheres at the second gap 5 are brought into the sintered graphite frame is solved, the stability of the graphite frame is ensured, meanwhile, the requirement on the vacuum degree is reduced, the oxygen content can be controlled to greatly improve the relevant performance of the titanium material in an ideal range, and the guarantee is provided for the sintering of the titanium alloy.
The utility model mainly aims at the tensile spline of titanium alloy MIM metal powder injection molding
Referring to the attached drawings 1-5, an argon pipeline in the furnace is modified, and during air inlet, a first air inlet channel 6 and a second air inlet channel 7 are combined into one and directly introduced into a graphite box 3; during air exhaust, the graphite box 3 enters the second gap 5 (namely the carbon felt 2) and then is exhausted from the second gap 5, meanwhile, the pressure in the furnace is kept within 0.1KPa-86KPa, and oxygen atmosphere is effectively brought out by argon. Measuring the oxygen and nitrogen content, the elongation, the tensile strength and the yield strength after sintering and discharging; compared with the performance of the sintered product after modification, the performance of the product is obviously improved.
Specifically, the method comprises 3 schemes, namely an original scheme (figure 5), a modified scheme 1 (figure 2) and a modified scheme 2 (figure 3), wherein 15 points in the furnace are respectively tested by adopting the 3 schemes to obtain data shown in figure 6, and corresponding line graphs are drawn according to the data, and the data are shown in figures 7 to 11.
Referring to fig. 7, in the drawing of tensile strength, the top is modified scheme 2, the middle is modified scheme 1, and the bottom is the original scheme, it can be seen that, after the modified scheme 2 is adopted, the tensile strength of the product is stabilized above 950, and is stable and far exceeds the original scheme.
Referring to fig. 8, in the graph of yield strength, the top is the improved scheme 2, the middle is the improved scheme 1, and the bottom is the original scheme, it can be seen that, after the improved scheme 2 is adopted, the yield strength of the product is stabilized at about 850, and is stable and far exceeds the original scheme.
Referring to fig. 9, in the graph of elongation, the top is the modified scheme 2, the middle is the modified scheme 1, and the bottom is the original scheme, it can be seen that, after the modified schemes 1 and 2 are adopted, the elongation of the product is improved, the elongation of the original scheme is below 5%, the elongation of the modified scheme 1 is between 5 and 10%, and the elongation of the modified scheme 2 is above 15%, even can reach 20%, which is far beyond the original scheme.
Referring to fig. 10 and 11, in the graphs of the oxygen content and the nitrogen content, the top is the original scheme, the middle is the modified scheme 1, and the bottom is the modified scheme 2, so that the oxygen and nitrogen content of the whole is reduced after the modified scheme is adopted, and particularly, when the modified scheme 2 is adopted, the reduction effect is most remarkable, the oxygen content is reduced to about 0.2%, and the nitrogen content is reduced to below 0.1%.
Referring to fig. 12, the top modification 2, the middle modification 1, and the bottom modification are shown as original ones, and it can be seen from comparison that after the modification is adopted, the sealing is improved, especially the modification 2 can be improved to more than 4.4.
Through the test of three schemes, the nitrogen oxygen content of the improved scheme 2 is obviously controlled and reduced, other performance effects are obvious, and particularly the elongation rate reaches about 20 percent. The effect is far superior to the prior scheme.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, so as not to limit the protection scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered in the protection scope of the present invention.
Claims (4)
1. The utility model provides a novel vacuum sintering furnace, includes the shell, set up the carbon felt in the shell, set up the graphite case in the carbon felt, and be first clearance between shell and carbon felt, be the second clearance between carbon felt and graphite case, its characterized in that: the graphite box is characterized in that a first air inlet channel is arranged on the shell and communicated to the second gap from the outer side of the shell, a second air inlet channel is arranged on the graphite box and communicated to the graphite box from the second gap, a first air exhaust channel and a second air exhaust channel are arranged on the shell, the first air exhaust channel is communicated to the second gap from the outer side of the shell, and the second air exhaust channel is communicated to the graphite box from the second gap.
2. The novel vacuum sintering furnace according to claim 1, characterized in that: the axes of the first pumping channel and the second pumping channel are parallel to each other.
3. The novel vacuum sintering furnace according to claim 1, characterized in that: the first air inlet channel and the second air inlet channel are connected to form an air inlet channel, the first air exhaust channel and the second air exhaust channel are arranged in a staggered mode, and the axes of the first air exhaust channel and the second air exhaust channel are parallel to each other.
4. The novel vacuum sintering furnace according to claim 1, characterized in that: the first air inlet channel, the second air inlet channel, the first air exhaust channel and the second air exhaust channel are argon pipelines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123123414.8U CN216745379U (en) | 2021-12-13 | 2021-12-13 | Novel vacuum sintering furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123123414.8U CN216745379U (en) | 2021-12-13 | 2021-12-13 | Novel vacuum sintering furnace |
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| CN216745379U true CN216745379U (en) | 2022-06-14 |
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| CN202123123414.8U Active CN216745379U (en) | 2021-12-13 | 2021-12-13 | Novel vacuum sintering furnace |
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- 2021-12-13 CN CN202123123414.8U patent/CN216745379U/en active Active
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20240506 Address after: 417108 Shiduiguan Group, Longxing Village, Fukou Town, Lianyuan City, Loudi City, Hunan Province Patentee after: Long Canhui Country or region after: China Address before: 338000 No. 142, Chetian village group, Chetian village committee, Yangjiang Town, Fenyi County, Xinyu City, Jiangxi Province Patentee before: Xia Meijun Country or region before: China |
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| TR01 | Transfer of patent right |