CN106180653B - The method that discharge plasma sintering prepares copper tungsten contact material - Google Patents
The method that discharge plasma sintering prepares copper tungsten contact material Download PDFInfo
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- CN106180653B CN106180653B CN201610638086.XA CN201610638086A CN106180653B CN 106180653 B CN106180653 B CN 106180653B CN 201610638086 A CN201610638086 A CN 201610638086A CN 106180653 B CN106180653 B CN 106180653B
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- copper
- contact material
- discharge plasma
- copper tungsten
- plasma sintering
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- SBYXRAKIOMOBFF-UHFFFAOYSA-N copper tungsten Chemical compound [Cu].[W] SBYXRAKIOMOBFF-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 238000005245 sintering Methods 0.000 title claims abstract description 35
- 239000000463 material Substances 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000010439 graphite Substances 0.000 claims abstract description 46
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 46
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 37
- 229910052802 copper Inorganic materials 0.000 claims abstract description 32
- 239000010949 copper Substances 0.000 claims abstract description 32
- 230000001681 protective effect Effects 0.000 claims abstract description 17
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000010792 warming Methods 0.000 claims abstract description 14
- 238000007731 hot pressing Methods 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 239000007789 gas Substances 0.000 claims description 18
- 239000000843 powder Substances 0.000 claims description 13
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 5
- 229910052786 argon Inorganic materials 0.000 claims description 5
- 239000001257 hydrogen Substances 0.000 claims description 5
- 229910052739 hydrogen Inorganic materials 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 238000005498 polishing Methods 0.000 claims description 5
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 5
- 230000008595 infiltration Effects 0.000 claims description 4
- 238000001764 infiltration Methods 0.000 claims description 4
- 238000003851 corona treatment Methods 0.000 abstract description 12
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000004904 shortening Methods 0.000 abstract 1
- 239000011248 coating agent Substances 0.000 description 10
- 238000000576 coating method Methods 0.000 description 10
- 239000011230 binding agent Substances 0.000 description 7
- 229910052721 tungsten Inorganic materials 0.000 description 5
- 239000010937 tungsten Substances 0.000 description 5
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 239000010445 mica Substances 0.000 description 4
- 229910052618 mica group Inorganic materials 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 229940072033 potash Drugs 0.000 description 4
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000010891 electric arc Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011812 mixed powder Substances 0.000 description 2
- 235000015320 potassium carbonate Nutrition 0.000 description 2
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 description 2
- 239000012286 potassium permanganate Substances 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 239000005361 soda-lime glass Substances 0.000 description 2
- 238000002679 ablation Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 210000003739 neck Anatomy 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D23/00—Casting processes not provided for in groups B22D1/00 - B22D21/00
- B22D23/04—Casting by dipping
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
-
- 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
- B22F3/1003—Use of special medium during sintering, e.g. sintering aid
- B22F3/1007—Atmosphere
-
- 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
- B22F3/12—Both compacting and sintering
- B22F3/14—Both compacting and sintering simultaneously
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/045—Alloys based on refractory metals
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C27/00—Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
- C22C27/04—Alloys based on tungsten or molybdenum
-
- 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
- B22F2003/1051—Sintering only by using electric current other than for infrared radiant energy, laser radiation or plasma ; by ultrasonic bonding by electric discharge
-
- 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
- B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
Abstract
The invention discloses a kind of method that discharge plasma sintering prepares copper tungsten contact material, comprise the following steps：Step 1, tungsten powder is poured into graphite jig, is positioned in plasma sintering stove and vacuumizes and pressurize, be passed through pulsed direct current and be warming up to 1,320 1480 DEG C, after being incubated 2.5 5min, furnace cooling obtains W skeleton；Step 2, copper billet is polished and is cleaned by ultrasonic clean, laser irradiation is carried out with the speed of 10 500 mm/seconds with laser and scanned, then carry out corona treatment, obtain that molten to ooze copper billet standby；Step 3, W skeleton is put into graphite boat, the molten copper billet that oozes is placed on W skeleton, is around filled using schmigel, is placed in the high temperature sintering furnace with protective gas atmosphere, after being warming up to 1,300 1400 DEG C, is incubated 23 hours, the copper tungsten sintered body after being sintered；Step 4, it is 50 100MPa in pressure by copper tungsten sintered body, temperature carries out vacuumizing hot pressing, is cooled to room temperature, that is, obtains copper tungsten contact material under conditions of being 800 850 DEG C.Production method of the present invention has the advantages of shortening the production cycle.
Description
Technical field
The present invention relates to electrical contact preparing technical field, and in particular to a kind of discharge plasma sintering prepares copper tungsten contact material
The method of material.
Background technology
The heart element of high-voltage switch gear, by its disjunction and connection, reach transmission, bear, disconnect, controlling the mesh of energy
's.High-voltage electric contact its Reliability of Microprocessor, durability, stability under high voltage, high current, the collective effect of high-temperature electric arc are
Influence switch life, the key factor of safe and reliable and power network stability.
Copper tungsten contact especially during breaker division, can produce electric arc, largely because resistance to electric arc ability is stronger
Energy is acted on contact, therefore the material of resistance to burning is the essential condition for ensureing breaker electrical endurance.
A kind of preparation method of copper tungsten contact of Publication No. CN102800420A disclosure of the invention, this method include following
Step：(1) tungsten base processed：Tungsten powder, forming agent, wetting agent are mixed according to weight than 2100: 11: 15, are then placed in shaping
It is compressing in mould, obtain tungsten base；(2) graphite crucible is made：According to the size for the copper tungsten contact to be made, choose corresponding
Graphite bar and processed be made inner chamber be contact shape graphite crucible；(3) graphite crucible is dried：Graphite crucible is put
Enter drying in oven；(4) graphite crucible is protected：Brushing graphite aqua or stickup graphite paper on the inwall of graphite crucible, then
Graphite crucible is put into baking oven inside holding；(5) copper-bearing materials are prepared：According to the weight and graphite of the copper tungsten contact to be made
The inner chamber size of crucible, copper-bearing materials corresponding to making；(6) crucible is filled：Tungsten base is put into graphite crucible bottom, then by cupric
Material is put into graphite crucible, and is placed on the upper surface of tungsten base；(7) shove charge vacuumizes heating infiltration：By the graphite after charging
Crucible is put into the heater in vacuum drying oven, is closed fire door and is started vavuum pump and vacuumized, vacuumizes rear heater
Graphite crucible is heated, copper-bearing materials infiltration, which enters in tungsten base, obtains copper tungsten contact；(8) cool down：After the completion of heating, in constant temperature
Graphite crucible is slowly exited into heater under state, is then shut off heater；(9) come out of the stove：Vavuum pump is closed after closing heater,
Open fire door and take out graphite crucible, copper tungsten contact is taken out from graphite crucible.
It can be seen that from the technical process of above-mentioned preparation copper tungsten contact material, it is necessary to by tungsten powder advance comprising, be molded link
Typically completed by uniformly adding forming agent and hydraulic press, and pre-sintering is carried out before high temperature oozes copper, to lift copper tungsten contact
Material combination property, it is pre-sintered by being completed by vacuum sintering furnace, cause the shortcomings of production cost is high, power consumption is big.In high pressure
Under the background that switching requirements are constantly lifted, the preparation of copper tungsten contact material, which improves optimization, becomes particularly significant.
The content of the invention
In view of the above-mentioned problems, it is an object of the invention to provide a kind of electric discharge shortened the production cycle and reduce energy consumption etc.
The method that ion sintering prepares copper tungsten contact material.
The technical scheme for solving above-mentioned technical problem is as follows：
The method that discharge plasma sintering prepares copper tungsten contact material, comprises the following steps：
Step 1, sinter：Tungsten powder is poured into graphite jig, mould is placed in hydrogen furnace, powder is reduced, gently
Burn, come out of the stove, be positioned in plasma sintering stove and vacuumize and pressurize, after pressure reaches 30-45MPa, be passed through pulse direct current
Electric current is simultaneously warming up to 1320-1480 DEG C, and after being incubated 2.5-5min, furnace cooling obtains W skeleton；
Step 2, copper billet is handled：Copper billet is taken, is first mechanically polished, the copper billet after polishing is in ultrasonic cleaning solution
Carry out ultrasonic wave cleaning, supersonic frequency 35-50KHz, temperature is 30-38 DEG C, after drying, with power be 5-20 watts continuous or
Pulse laser carries out laser irradiation scanning with the speed of 10-500 mm/seconds, is cooled to room temperature, then carries out corona treatment,
Obtain that molten to ooze copper billet standby；
Step 3, high temperature oozes copper：W skeleton is put into graphite boat, the molten copper billet that oozes is placed on W skeleton, around using firm
Beautiful powder landfill, is placed in the high temperature sintering furnace with protective gas atmosphere, after being warming up to 1300-1400 DEG C, is incubated 2-3 hours,
Copper tungsten sintered body after being sintered；
Step 4, hot pressing：In pressure it is 50-100MPa by copper tungsten sintered body, temperature is carried out under conditions of being 800-850 DEG C
Hot pressing is vacuumized, hot pressing time 40-100min, room temperature is cooled to, that is, obtains copper tungsten contact material.
Preferably, the particle diameter of the tungsten powder is 4-8 μm.
Preferably, the pulsed direct current is 1200-1800A.
Preferably, protective gas described in step 3 is nitrogen.
Preferably, protective gas atmosphere flow >=0.2m3/ h/h,
Preferably, it is warming up to 1320-1480 DEG C in step 1 with 100-300 DEG C/min heating rate.
Preferably, corona treatment described in step 2 is that argon plasma is handled, processing time 15-20min.
Preferably, coating is scribbled on the surface of graphite jig and/or graphite boat, the chemical composition of the coating is high-alumina fly
25-40 parts by weight, passivator are 1-3 parts by weight, mica powder 4-8 parts by weight, graphite 5-10 parts by weight, water 1-3 parts by weight, are bonded
Agent 20-30 parts by weight.
Preferably, wherein passivator is any in CrO3, KMnO4, K2Cr2O7；Binding agent be soda-lime glass, potash glass or
It is any in three kinds of waterglass of sodium-potash glass.
The present invention remarkable result be：The present invention by plasma sintering technique by substituting shaping and pre-sintered two rings
Section, while improving the arc resistant ablation property of copper tungsten contact material, production cost is substantially reduced, reduces power consumption.Prepare
Copper tungsten contact material while performance is ensured, be not only effectively shortened the production cycle, reduce power consumption, and heat equal
Even, programming rate is fast, and sintering temperature is low, and sintering time is short, and production efficiency is high, product tissue fine uniform, can keep raw material
Nature, the copper tungsten contact material of high-compactness can be obtained.
Exemplified by obtaining mixed powder CuW70, CuW90 contact material with the inventive method, the following (table 1 of its performance detection：Mixed powder
CuW70, CuW90 contact material performance detection table)：
Table 1
In addition, after the present invention is provided with coating on the surface of graphite jig and graphite boat, because the coating can be resistant to
More than 1500 DEG C of temperature, therefore, buffer action not only is served to the product and graphite jig of sintering, also contributed to pair
The product of graphite jig and sintering plays a protective role.
Embodiment
Embodiment 1：
The method that discharge plasma sintering prepares copper tungsten contact material, comprises the following steps：
Step 1, sinter：The tungsten powder that particle diameter is 4 μm is poured into graphite jig, mould is placed in hydrogen furnace, to powder
Reduced, it is light-burned, come out of the stove, be positioned in plasma sintering stove and vacuumize and pressurize, the corona treatment is argon gas
Corona treatment, processing time 15min, after pressure reaches 30MPa, it is passed through 1200A pulsed direct current and with 100
DEG C/min heating rate is warming up to 1320 DEG C, after being incubated 2.5min, furnace cooling obtains W skeleton；
Step 2, copper billet is handled：Copper billet is taken, is first mechanically polished, the copper billet after polishing is in ultrasonic cleaning solution
Ultrasonic wave cleaning, supersonic frequency 35KHz are carried out, temperature is 30 DEG C, after drying, with the continuous or pulse laser that power is 5 watts
Laser irradiation scanning is carried out with the speed of 10 mm/seconds, is cooled to room temperature, then carries out corona treatment, obtains molten oozing copper billet
It is standby；
Step 3, high temperature oozes copper：W skeleton is put into graphite boat, the molten copper billet that oozes is placed on W skeleton, around using firm
Beautiful powder landfill, is placed in the high temperature sintering furnace with protective gas atmosphere, and the protective gas is nitrogen, protective gas atmosphere stream
Measure as 0.2m3/ h/h, after being warming up to 1300 DEG C, 2 hours are incubated, the copper tungsten sintered body after being sintered；
Step 4, hot pressing：In pressure it is 50MPa by copper tungsten sintered body, temperature carries out vacuumizing heat under conditions of being 800 DEG C
Pressure, hot pressing time 40min, is cooled to room temperature, that is, obtains copper tungsten contact material.
Coating is scribbled on the surface of the graphite jig and/or graphite boat, the chemical composition of the coating is the weight of high-alumina fly 25
Part is measured, passivator is 1 parts by weight, the parts by weight of mica powder 4, the parts by weight of graphite 5, the parts by weight of water 1, the parts by weight of binding agent 20.Wherein
Passivator is CrO3, and binding agent is soda-lime glass.
Embodiment 2：
Step 1, sinter：The tungsten powder that particle diameter is 6 μm is poured into graphite jig, mould is placed in hydrogen furnace, to powder
Reduced, it is light-burned, come out of the stove, be positioned in plasma sintering stove and vacuumize and pressurize, the corona treatment is argon gas
Corona treatment, processing time 17.5min, after pressure reaches 37.5MPa, be passed through 1500A pulsed direct current and with
200 DEG C/min heating rate is warming up to 1400 DEG C, and after being incubated 3.75min, furnace cooling obtains W skeleton；
Step 2, copper billet is handled：Copper billet is taken, is first mechanically polished, the copper billet after polishing is in ultrasonic cleaning solution
Ultrasonic wave cleaning, supersonic frequency 42.5KHz are carried out, temperature is 34 DEG C, after drying, with the continuous or pulse that power is 12.5 watts
Laser carries out laser irradiation scanning with the speed of 255 mm/seconds, is cooled to room temperature, then carries out corona treatment, obtains molten ooze
Copper billet is standby；
Step 3, high temperature oozes copper：W skeleton is put into graphite boat, the molten copper billet that oozes is placed on W skeleton, around using firm
Beautiful powder landfill, is placed in the high temperature sintering furnace with protective gas atmosphere, and the protective gas is nitrogen, protective gas atmosphere stream
Measure as 0.3m3/ h/h, after being warming up to 1350 DEG C, 2.5 hours are incubated, the copper tungsten sintered body after being sintered；
Step 4, hot pressing：In pressure it is 75MPa by copper tungsten sintered body, temperature carries out vacuumizing heat under conditions of being 825 DEG C
Pressure, hot pressing time 70min, is cooled to room temperature, that is, obtains copper tungsten contact material.
Coating is scribbled on the surface of the graphite jig and/or graphite boat, the chemical composition of the coating is high-alumina fly 32.5
Parts by weight, passivator are 2 parts by weight, the parts by weight of mica powder 6, the parts by weight of graphite 7.5, the parts by weight of water 2, the parts by weight of binding agent 25.
Wherein passivator is KMnO4, and binding agent is potash glass.
Embodiment 3：
Step 1, sinter：The tungsten powder that particle diameter is 8 μm is poured into graphite jig, mould is placed in hydrogen furnace, to powder
Reduced, it is light-burned, come out of the stove, be positioned in plasma sintering stove and vacuumize and pressurize, the corona treatment is argon gas
Corona treatment, processing time 20min, after pressure reaches 45MPa, it is passed through 1800A pulsed direct current and with 300
DEG C/min heating rate is warming up to 1480 DEG C, after being incubated 5min, furnace cooling obtains W skeleton；
Step 2, copper billet is handled：Copper billet is taken, is first mechanically polished, the copper billet after polishing is in ultrasonic cleaning solution
Ultrasonic wave cleaning, supersonic frequency 50KHz are carried out, temperature is 38 DEG C, after drying, with the continuous or pulse laser that power is 20 watts
Laser irradiation scanning is carried out with the speed of 500 mm/seconds, is cooled to room temperature, then carries out corona treatment, obtains molten oozing copper billet
It is standby；
Step 3, high temperature oozes copper：W skeleton is put into graphite boat, the molten copper billet that oozes is placed on W skeleton, around using firm
Beautiful powder landfill, is placed in the high temperature sintering furnace with protective gas atmosphere, and the protective gas is nitrogen, protective gas atmosphere stream
Measure as 0.35m3/ h/h, after being warming up to 1400 DEG C, 3 hours are incubated, the copper tungsten sintered body after being sintered；
Step 4, hot pressing：In pressure it is 100MPa by copper tungsten sintered body, temperature carries out vacuumizing heat under conditions of being 850 DEG C
Pressure, hot pressing time 100min, is cooled to room temperature, that is, obtains copper tungsten contact material.
Coating is scribbled on the surface of the graphite jig and/or graphite boat, the chemical composition of the coating is the weight of high-alumina fly 40
Part is measured, passivator is 3 parts by weight, the parts by weight of mica powder 8, the parts by weight of graphite 10, the parts by weight of water 3, the parts by weight of binding agent 30.Wherein
Passivator is K2Cr2O7, and binding agent is sodium-potash glass.
Embodiments of the invention are the foregoing is only, are not intended to limit the scope of the invention, it is every to utilize this hair
The equivalent structure or equivalent flow conversion that bright description is made, or directly or indirectly it is used in other related technology necks
Domain, similarly it is included in the scope of patent protection of the present invention.
Claims (7)
1. the method that discharge plasma sintering prepares copper tungsten contact material, it is characterised in that comprise the following steps：
Step 1, sinter：Tungsten powder is poured into graphite jig, mould is placed in hydrogen furnace, powder is reduced, it is light-burned, go out
Stove, it is positioned in plasma sintering stove and vacuumizes and pressurize, after pressure reaches 30-45MPa, is passed through pulsed direct current simultaneously
1320-1480 DEG C is warming up to, after being incubated 2.5-5min, furnace cooling obtains W skeleton；
Step 2, copper billet is handled：Copper billet is taken, is first mechanically polished, the copper billet after polishing is carried out in ultrasonic cleaning solution
Ultrasonic wave is cleaned, and after drying, the continuous or pulse laser for being 5-20 watts with power is swashed with the speed of 10-500 mm/seconds
Light irradiation scans, and is cooled to room temperature, then carries out discharge plasma processing, and it is standby to obtain infiltration copper billet；
Step 3, high temperature oozes copper：W skeleton is put into graphite boat, infiltration copper billet is placed on W skeleton, around using schmigel
Landfill, is placed in the high temperature sintering furnace with protective gas atmosphere, after being warming up to 1300-1400 DEG C, is incubated 2-3 hours, obtains
Copper tungsten sintered body after sintering；
Step 4, hot pressing：In pressure it is 50-100MPa by copper tungsten sintered body, temperature carries out taking out true under conditions of being 800-850 DEG C
Empty hot pressing, hot pressing time 40-100min, room temperature is cooled to, that is, obtains copper tungsten contact material.
2. the method that discharge plasma sintering according to claim 1 prepares copper tungsten contact material, it is characterised in that described
The particle diameter of tungsten powder is 4-8 μm.
3. the method that discharge plasma sintering according to claim 1 prepares copper tungsten contact material, it is characterised in that described
Pulsed direct current is 1200-1800A.
4. the method that discharge plasma sintering according to claim 1 prepares copper tungsten contact material, it is characterised in that step
In 3, the protective gas is nitrogen.
5. the method that the discharge plasma sintering according to claim 1 or 4 prepares copper tungsten contact material, it is characterised in that
Protective gas atmosphere flow >=0.2m in described high temperature sintering furnace3/h。
6. the method that discharge plasma sintering according to claim 1 prepares copper tungsten contact material, it is characterised in that step
In 1 1320-1480 DEG C is warming up to 100-300 DEG C/min heating rate.
7. the method that discharge plasma sintering according to claim 1 prepares copper tungsten contact material, it is characterised in that step
The processing of discharge plasma described in 2 is handled for argon plasma.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610638086.XA CN106180653B (en) | 2016-08-05 | 2016-08-05 | The method that discharge plasma sintering prepares copper tungsten contact material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610638086.XA CN106180653B (en) | 2016-08-05 | 2016-08-05 | The method that discharge plasma sintering prepares copper tungsten contact material |
Publications (2)
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| CN106735207B (en) * | 2016-12-13 | 2018-06-15 | 合肥工业大学 | A kind of preparation method of high-compactness Cu/CuCr gradient composites |
| CN106978586B (en) * | 2017-04-01 | 2018-12-07 | 西安交通大学 | A kind of overlay coating processing method of arc-chutes copper tungsten electrical contact material |
| CN108262483B (en) * | 2018-03-01 | 2020-06-05 | 合肥工业大学 | SPS sintering connection method for tungsten and molybdenum dissimilar refractory metal |
| CN108950289B (en) * | 2018-07-03 | 2020-07-10 | 中国科学院金属研究所 | Copper-tungsten composite material with micro-oriented structure and preparation method thereof |
| CN109234597A (en) * | 2018-11-22 | 2019-01-18 | 江苏经纬阀业有限公司 | A kind of tungsten-copper alloy and preparation method thereof |
| CN110724847B (en) * | 2019-12-04 | 2020-10-20 | 河南科技大学 | Method for preparing bicontinuous phase composite material by pressureless infiltration |
| CN111618297B (en) * | 2020-04-21 | 2022-06-07 | 陕西斯瑞新材料股份有限公司 | Preparation method of rapid sintering forming silver-based contact |
| CN111636023B (en) * | 2020-04-23 | 2021-04-23 | 陕西斯瑞新材料股份有限公司 | Preparation method of copper-tungsten gradient material electrical contact |
| CN112658243B (en) * | 2020-11-21 | 2022-10-25 | 陕西斯瑞新材料股份有限公司 | Preparation method of CuW/CuCr integral contact |
| CN113210829B (en) * | 2021-04-28 | 2022-06-07 | 陕西斯瑞新材料股份有限公司 | CuW alloy-Q345D steel integral contact electron beam welding process |
| CN112872356B (en) * | 2021-05-06 | 2021-07-23 | 陕西斯瑞新材料股份有限公司 | Method for improving strength of copper-tungsten and copper bonding surface |
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