CN107716925A - A kind of super-pressure anti-slip mould for discharge plasma sintering - Google Patents
A kind of super-pressure anti-slip mould for discharge plasma sintering Download PDFInfo
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- CN107716925A CN107716925A CN201710888300.1A CN201710888300A CN107716925A CN 107716925 A CN107716925 A CN 107716925A CN 201710888300 A CN201710888300 A CN 201710888300A CN 107716925 A CN107716925 A CN 107716925A
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- ram
- cushion block
- inner ram
- sintering
- mould
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Links
- 238000005245 sintering Methods 0.000 title claims abstract description 63
- 239000000843 powder Substances 0.000 claims abstract description 16
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000012360 testing method Methods 0.000 claims abstract description 5
- 238000012544 monitoring process Methods 0.000 claims abstract description 4
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims description 7
- 239000000956 alloy Substances 0.000 claims description 6
- 239000007770 graphite material Substances 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 4
- 229910052582 BN Inorganic materials 0.000 claims description 3
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 13
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 7
- 229910002804 graphite Inorganic materials 0.000 abstract description 7
- 239000010439 graphite Substances 0.000 abstract description 7
- 101100328887 Caenorhabditis elegans col-34 gene Proteins 0.000 description 9
- 238000007599 discharging Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000004663 powder metallurgy Methods 0.000 description 3
- 238000004826 seaming Methods 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- RRLHMJHRFMHVNM-BQVXCWBNSA-N [(2s,3r,6r)-6-[5-[5-hydroxy-3-(4-hydroxyphenyl)-4-oxochromen-7-yl]oxypentoxy]-2-methyl-3,6-dihydro-2h-pyran-3-yl] acetate Chemical compound C1=C[C@@H](OC(C)=O)[C@H](C)O[C@H]1OCCCCCOC1=CC(O)=C2C(=O)C(C=3C=CC(O)=CC=3)=COC2=C1 RRLHMJHRFMHVNM-BQVXCWBNSA-N 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000009770 conventional sintering Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 239000012761 high-performance material Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002159 nanocrystal Substances 0.000 description 1
- 239000002707 nanocrystalline material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/105—Sintering only by using electric current other than for infrared radiant energy, laser radiation or plasma ; by ultrasonic bonding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
- B22F3/03—Press-moulding apparatus therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2202/00—Treatment under specific physical conditions
- B22F2202/13—Use of plasma
Abstract
The invention discloses a kind of super-pressure anti-slip mould for discharge plasma sintering, the parts that the parts shaped by high purity graphite and high-strength diamondite shape combine；Wherein inner membrance is embedded in external mold madial wall boss top, and outer mold walls are provided with radial blind holes, for installing the real-time monitoring temperature of thermocouple.Upper inner ram is respectively embedded in the upper and lower part of internal model madial wall with lower inner ram, and the cavity formed between internal model is sintering zone, for loading the powder of sintering test specimen.Lower cushion block and upper cushion block one end be plane respectively against lower outer ram and upper outer ram, other end is provided with discoid projection, and is symmetrically installed respectively with lower inner ram, the cooperation of upper inner ram.Mould ensure it is smoothly conductive on the premise of, effectively improve the sintering pressure acted on sample, and relative slide occurs in sintering process for interior external mold after preventing mould long-time use；So as to reduce production cost, production efficiency is improved.
Description
Technical field
The present invention relates to powder metallurgy sintered equipment technical field, specifically, is related to a kind of plasma discharging that is used for and burns
The super-pressure anti-slip mould of knot.
Background technology
In recent years, nanocrystalline material because its excellent performance at home and abroad triggered research upsurge, yet with preparation
Technology is limited, is difficult to prepare large-scale bulk nanometer material at present.Relative, nanometer crystal powder is prepared by high energy ball mill method
The technology at end comparative maturity, therefore powder is prepared into as current by lumpy nanometer crystalline substance material using powder metallurgy process
The focus of research.At present, high temperature insostatic pressing (HIP) (HIP), ultra-high pressure sintering (UPS) and discharge plasma sintering (SPS) are mainly passed through
Method prepares bulk nanometer material.
Discharge plasma sintering method is that the powder such as metal are loaded into graphite etc. made of material in mould, utilizes upper mould
Pulse current and sintering pressure are put on sintered powder by punching, bottom punch and powered electrode, through discharge activation, thermoplastic deformation and cold
But a kind of novel powder metallurgy sintering technology of high performance material is produced.It is mainly characterized in that pulse direct current directly passes through graphite
Mould, so as to produce substantial amounts of Joule heat, the reachable 200K/min heating rates being exceedingly fast can be realized, with conventional sintering technique phase
Than it can realize the density close to theoretical value in time under relatively low sintering temperature, shorter.But plasma discharging
Sintering must be aided with special supporting mould.
A kind of discharge plasma sintering mould is disclosed in patent of invention CN205200542U, the mould includes mold base
With the mould set and seaming chuck on mold base, the space that the inwall of mould set surrounds forms mold cavity, and seaming chuck is from mould
Has the upper end press-in die chamber of set；The lower section of the seaming chuck is provided with upper tabletting, and the mold base is provided with lower sheeting, upper pressure
Piece and lower sheeting are slidingly sealed cooperation with the mold cavity respectively, the space in mold cavity between upper tabletting and lower sheeting
For the sintering zone of material powder.The mould can effectively avoid in vacuum-sintering causing the damage of instrument because of the effusion of powder
It is bad, reduce discharge plasma sintering process and prepare cost, while Mould operation is simple and convenient, improves production efficiency.However, by
Overall in the mould be prepared by graphite, and the maximum pressure that conventional graphite is born is 50MPa or so, greatly limitation
Agglomerating plant maximum load, and then make it that sintered specimen consistency is not high.
A kind of discharge plasma sintering mould is disclosed in patent CN202571280U, the mould covers successively including inside and outside
Pressure head, mould set and the outer die casing connect, the space that the inwall of mould set surrounds form mold cavity.Although the mould can be in certain journey
Pressure during sintering is improved on degree, but because pressure head is still to be manufactured by graphite, the limited pressure that can be improved.It is and if long
Time uses, and the inside and outside die clearance of the mould can gradually increase, and in sintering process, interior external mold may occur to slide relatively,
So as to cause the problem of dropping of sample, the mold use life-span is significantly reduced, adds the preparation cost of sample.
The content of the invention
In order to avoid the shortcomings of the prior art, the present invention proposes that a kind of super-pressure for discharge plasma sintering is prevented
Slide mould；Shape zero of the parts and high-strength diamondite that the mould is shaped by high purity graphite material
Part combines, and on the premise of the smooth conduction of mould energy is ensured, effectively improves the sintering pressure acted on sample, greatly carries
The consistency of high sintered type sample, sintering temperature is reduced, and by the design of external mold inwall convex platform, prevent mould from making for a long time
The problem of slip relative with rear generation, so as to reduce production cost, improve production efficiency.
The technical solution adopted for the present invention to solve the technical problems is:Including external mold, internal model, lower outer ram, upper external pressure
Head, lower inner ram, upper inner ram, lower cushion block, upper cushion block, the external mold is the hollow cavity of upper and lower ends opening, on the inside of external mold
Circumferentially arranged with boss on wall, inner membrance, which is embedded in external mold, is located at side wall boss top, and outer mold walls are provided with radial blind holes, are used for
The real-time monitoring temperature of thermocouple is installed；The upper inner ram and the lower inner ram are two structure identical roundlet cylindrical portions
Part, both ends are plane, and upper inner ram and lower inner ram are respectively embedded in internal model inner sidewall upper portion and bottom, and upper inner ram is with
The cavity formed between inner ram and internal model is sintering zone, for loading the powder of sintering test specimen；Upper cushion block and upper outer ram according to
The secondary top for being placed on inner ram, lower cushion block and lower outer ram are placed sequentially in the bottom of lower inner ram；The lower cushion block with
The upper cushion block is two structure identical parts, and lower cushion block and upper cushion block one end are plane respectively against lower outer ram and upper outer
The other end of pressure head, lower cushion block and upper cushion block is provided with discoid projection, and coordinates symmetrically with lower inner ram, upper inner ram respectively
Installation.
External mold, internal model, lower outer ram and upper outer ram use high purity graphite material.
Lower inner ram, upper inner ram, lower cushion block and upper cushion block use high-strength tungsten carbide alloy material.
In the inwall of internal model, the lower inner ram end face spraying boron nitride relative with upper inner ram.
Beneficial effect
A kind of super-pressure anti-slip mould for discharge plasma sintering proposed by the present invention, is added by high purity graphite material
The parts that the parts and high-strength tungsten carbide alloy material of work shaping shape combine；It is provided with mould for heat
The thermometer hole of galvanic couple thermometric.On the premise of the smooth conduction of mould is ensured, the sintering pressure acted on sample is effectively improved,
The consistency of sintered specimen is improved, reduces sintering temperature.And by the design of mould, effectively prevent mould from using for a long time
Relative the problem of sliding, occurs in sintering process for interior external mold afterwards, so as to reduce production cost, improves production efficiency.
A. traditional discharge plasma sintering mould is made up of graphite, and the limiting pressure that graphite material can bear is
50Mpa.By the design of mould, in the case where not influenceing conductive capability, the Upper gasket of mould, lower gasket, upper inner ram, under
Inner ram shapes by high-strength tungsten carbide alloy material, and the pressure that high-purity tungsten carbide alloy material can be born reaches 1Gpa, because
And nearly 20 times of boost in pressure is born, the consistency of sintered specimen is greatly promoted, and sintering temperature is reduced, so as to improve production
Efficiency, reduce production cost.
B. after a long time use, the gap between external mold and internal model can become big to conventional discharge plasma agglomeration mould, lead
Both in sintering process are caused to occur to slide relatively, so that sintering can not continue.On the external mold inwall of mould
Boss structure is devised, is aided with the reasonable cooperation of size, effectively prevents coming off for inside and outside mould, when shortening the dress of sample and taking
Between, reduce the damage to mould.
Brief description of the drawings
Below in conjunction with the accompanying drawings with embodiment to a kind of anti-skidding stamping die of super-pressure for discharge plasma sintering of the invention
Tool is described in further detail.
Fig. 1 is the super-pressure anti-slip mould structure schematic diagram for discharge plasma sintering.
Fig. 2 is the super-pressure anti-slip die cut view for discharge plasma sintering.
In figure
1. on 2. inner membrance of external mold, 3. times inner rams 4. on the lower cushion block 6. of inner ram 5. on 7. times outer rams of cushion block 8.
Outer ram
Embodiment
The present embodiment is a kind of super-pressure anti-slip mould for discharge plasma sintering；First received what is prepared in advance
Rice crystalline flour end is placed in the sintering zone formed by internal model, upper inner ram and lower inner ram, it is ensured that powder is close in sintering zone
Filling.During work, mould is placed in discharging plasma sintering equipment, is powered and causes whole mould thermally equivalent heating, with
Pressure is acted on outer ram simultaneously for this.Promote cushion block to be moved to mould inside, by ladder power transmission, finally pressure is applied to
On powdered sample so that powdered sample is sintered under pressure.The pressure that can be provided due to discharging plasma sintering equipment
Power is limited, but passes through high-strength tungsten carbide ladder power transmission so that the pressure acted on sample greatly increases, and can effectively improve burning
The consistency of sample is tied, and improves production efficiency, reduces production cost.
Refering to Fig. 1, Fig. 2, the super-pressure for discharge plasma sintering is prevented with reference to the sintering process of nano crystal iron
Mould is slid to be described further.
In the present embodiment, for the super-pressure anti-slip mould of discharge plasma sintering, by external mold 1, internal model 2, lower external pressure
First 7, upper outer ram 8, lower inner ram 3, upper inner ram 4, lower cushion block 5, upper cushion block 6 form；Wherein, external mold 1 is opened for upper and lower ends
Mouthful cylindrical hollow cavity, circumferentially arranged with boss on the madial wall of external mold 1, inner membrance 2, which is embedded in external mold 1, is located at side wall boss
Top, the boss design of external mold inwall effectively prevent relative slip of the mould in sintering process.It is provided with the wall of external mold 1 radially
Blind hole, for installing the real-time monitoring temperature of thermocouple.Upper inner ram 4 and lower inner ram 3 are two structure identical roundlet cylindricalitys
Part, both ends are plane；Upper inner ram 4 and lower inner ram 3 are respectively embedded under the inner sidewall upper portion of internal model 2 and the madial wall of internal model 2
Portion, and the cavity formed between upper inner ram 4 and lower inner ram 3 and internal model 2 is sintering zone, for loading the powder of sintering test specimen
End.Upper cushion block 6 and upper outer ram 8 are placed sequentially in the top of inner ram 4, and lower cushion block 5 and lower outer ram 7 are placed sequentially in down
The bottom of inner ram 3.Lower cushion block 5 is two structure identical parts with upper cushion block 6, and lower cushion block 5 and upper one end of cushion block 6 are plane
Respectively against lower outer ram 7 and upper outer ram 8, the other end of lower cushion block 5 and upper cushion block 6 is provided with discoid projection, and respectively
Coordinate with lower inner ram 3, upper inner ram 4 and be symmetrically installed.
In the present embodiment, external mold 1, internal model 2, lower outer ram 7 and upper outer ram 8 are processed using high purity graphite material.Under
Inner ram 3, upper inner ram 4, lower cushion block 5 and upper cushion block 6 are processed using high-strength tungsten carbide alloy material.When mould assembles,
The inwall of internal model 2, the lower inner ram 3 end face spraying boron nitride relative with upper inner ram 4.
In the present embodiment, a diameter of 1.1mm of radial blind holes on the wall of external mold 1.In boss structure on the inwall of external mold 1 can be fixed
The relative position of mould and external mold, facilitates the dress of sample to take, and relative slide occurs for interior external mold after effectively preventing mould long-time use.
The cavity formed by internal model, lower inner ram and upper inner ram is powder sintered area；From formula P=F/S, when equipment can be applied
When the power added is certain, external mold 1 improves pressure by reducing sectional area.Therefore, the end face of lower cushion block 5 and upper cushion block 6
Provided with discoid convex shape, ladder power transmission is formed, power is finally acted on the smaller lower inner ram 3 of cross-sectional area and upper internal pressure
On first 4, play a part of to increase pressure, realize ultra-high pressure sintering.
Experimentation:
First check whether mould has the situation of cracking damage before dress sample is sintered, more renew mould immediately if any need
Tool, in order to avoid occur unexpected, damage discharging plasma sintering equipment in sintering process；
Before nanocrystalline iron powder is loaded, in the inwall of internal model 2, the end face spraying nitridation of lower inner ram 3 and upper inner ram 4
Boron, the sampling work after the completion of conveniently sintering；
After lower inner ram 3 and internal model 2 are assembled, load manocrystalline powders in the cavity formed to both, and by upper interior
The powder pressure that pressure head 4 coordinates baby press to be loaded into is tight, it is ensured that the powder sintered of loading goes out to meet the style of requirement of experiment；
After powder loads, by structure assembling die, and it is put into discharging plasma sintering equipment, thermocouple is inserted in outer
In the reserved blind hole of mould outer wall, the fire door of discharging plasma sintering equipment is shut, extracts vacuum, while write control on computers
Gentle pressure control program, when vacuum is less than 10-2During Pa, experiment is sintered；
In sintering process, voltage and current values that Real Time Observation discharging plasma sintering equipment is shown, and pay attention to observing
The working condition of mould, if mould occurs cracking situation and should stop testing immediately；
After sintering, allow style furnace cooling, when temperature is less than 150 DEG C, open fire door, taking-up sample, experiment knot
Beam.
Claims (4)
- A kind of 1. super-pressure anti-slip mould for discharge plasma sintering, it is characterised in that:Including external mold, internal model, lower outer Pressure head, upper outer ram, lower inner ram, upper inner ram, lower cushion block, upper cushion block, the external mold are the middle cavity of upper and lower ends opening Body, circumferentially arranged with boss on external mold madial wall, inner membrance, which is embedded in external mold, is located at side wall boss top, and outer mold walls are provided with footpath To blind hole, for installing the real-time monitoring temperature of thermocouple；The upper inner ram and the lower inner ram are two structure identicals Roundlet cylindrical part, both ends are plane, and upper inner ram and lower inner ram are respectively embedded in internal model inner sidewall upper portion and bottom, and on Inner ram and the lower cavity formed between inner ram and internal model are sintering zone, for loading the powder of sintering test specimen；Upper cushion block and Upper outer ram is placed sequentially in the top of inner ram, and lower cushion block and lower outer ram are placed sequentially in the bottom of lower inner ram；Institute It is two structure identical parts that lower cushion block, which is stated, with the upper cushion block, and lower cushion block and upper cushion block one end are plane respectively against lower outer Pressure head and upper outer ram, the other end of lower cushion block and upper cushion block are provided with discoid projection, and respectively with lower inner ram, upper internal pressure Head, which coordinates, to be symmetrically installed.
- 2. the super-pressure anti-slip mould according to claim 1 for discharge plasma sintering, it is characterised in that:Outside Mould, internal model, lower outer ram and upper outer ram use high purity graphite material.
- 3. the super-pressure anti-slip mould according to claim 1 for discharge plasma sintering, it is characterised in that:In lower Pressure head, upper inner ram, lower cushion block and upper cushion block use high-strength tungsten carbide alloy material.
- 4. the super-pressure anti-slip mould according to claim 1 for discharge plasma sintering, it is characterised in that:Inside The inwall of mould, the lower inner ram end face spraying boron nitride relative with upper inner ram.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710888300.1A CN107716925B (en) | 2017-09-27 | 2017-09-27 | A kind of super-pressure anti-slip mold for discharge plasma sintering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710888300.1A CN107716925B (en) | 2017-09-27 | 2017-09-27 | A kind of super-pressure anti-slip mold for discharge plasma sintering |
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| Publication Number | Publication Date |
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| CN107716925A true CN107716925A (en) | 2018-02-23 |
| CN107716925B CN107716925B (en) | 2019-07-05 |
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| CN201710888300.1A Active CN107716925B (en) | 2017-09-27 | 2017-09-27 | A kind of super-pressure anti-slip mold for discharge plasma sintering |
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| CN109465449A (en) * | 2019-01-07 | 2019-03-15 | 哈尔滨工业大学 | A kind of beneficial friction Fast Sintering forming method of larger ratio of height to diameter hard alloy cutter |
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| CN110281683A (en) * | 2019-07-18 | 2019-09-27 | 广州番禺职业技术学院 | A kind of artwork Ornament production method of ceramic inserts metal |
| CN110293224B (en) * | 2019-07-18 | 2021-07-27 | 广州番禺职业技术学院 | Metal craft ornament with mottled colors and manufacturing method thereof |
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| CN112091211A (en) * | 2020-08-20 | 2020-12-18 | 上海交通大学 | Preparation method of diffusion multi-element joint |
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| CN112458384B (en) * | 2020-11-25 | 2022-08-02 | 浙江炜烨晶体纤维有限公司 | Adopt polycrystal mullite fibre heat retaining discharge plasma sintering mould |
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