CN110508816A - A kind of preparation method of high voltage direct current contact for relay material - Google Patents

A kind of preparation method of high voltage direct current contact for relay material Download PDF

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Publication number
CN110508816A
CN110508816A CN201910833509.7A CN201910833509A CN110508816A CN 110508816 A CN110508816 A CN 110508816A CN 201910833509 A CN201910833509 A CN 201910833509A CN 110508816 A CN110508816 A CN 110508816A
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powder
copper
direct current
high voltage
preparation
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CN110508816B (en
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刘凯
李刚
王小军
张石松
师晓云
王勇
武旭红
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Shaanxi Sirui Advanced Materials Co Ltd
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Shaanxi Sirui Advanced Materials Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/12Both compacting and sintering
    • B22F3/16Both compacting and sintering in successive or repeated steps
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making alloys
    • C22C1/10Alloys containing non-metals
    • C22C1/1078Alloys containing non-metals by internal oxidation of material in solid state
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C32/00Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides whether added as such or formed in situ
    • C22C32/001Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides whether added as such or formed in situ with only oxides
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C9/00Alloys based on copper
    • C22C9/01Alloys based on copper with aluminium as the next major constituent
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00Supplementary information concerning processes or compositions relating to powder metallurgy
    • B22F2998/10Processes characterised by the sequence of their steps
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2999/00Aspects linked to processes or compositions used in powder metallurgy

Abstract

The invention discloses a kind of preparation methods of high voltage direct current contact for relay material, belong to technical field of powder metallurgy material preparation.By suppressing twice and two-step sintering, first compacting first carries out being shaped to blank, and material stress is removed after just burning, and reduces deformation intensity;Second of compacting purpose is to carry out shaping, reaches final products size, reduces subsequent machine and add process, the mechanical strength and toughness of material of material can be improved in second of resintering, be conducive to the service life of material, which reaches million times, therefore double sintering is needed to improve the strength of materials;The present invention is a kind of preparation method of high voltage direct current contact for relay material newly developed, technical process is simple, low cost and high performance high voltage direct current contact for relay material, while meeting service performance, with very high cost performance, alternative current fine copper contact, greatly improves the reliability of high voltage direct current relay.

Description

A kind of preparation method of high voltage direct current contact for relay material
Technical field
The invention belongs to technical field of powder metallurgy material preparation, and in particular to a kind of high voltage direct current contact for relay material The preparation method of material.
Background technique
The market maintenance of popularization with country to new-energy automobile strategy, new-energy automobile increases sharply, and new energy Source automobile generally uses high-tension battery group to provide power drive for electric vehicle, to guarantee the normal on-off of electrical system, in electronic vapour Needed between the battery system and electric machine controller of vehicle configuration high voltage direct current relay, after system is out of service from buffer action, Connection function from when system is run, when vehicle is closed or when breaking down, can safety by energy-storage system from vehicle electrical systems Disjunction circuit is played the role of in middle separation, and therefore, high voltage direct current relay is new-energy automobile key safety device, if do not had There is it, electric vehicle cannot start, travels and stop.So high workbench voltage, it is desirable that high voltage direct current relay product Need to have the characteristics of good high pressure resistant, shock resistance and breaking capacity.
Contact as high voltage direct current relay core component it is necessary to have high pressure resistant, resistance to load capacity is strong, shock resistance, The characteristics such as the strong, strong breaking capacity of arc extinguishing ability, and domestic high voltage direct current relay manufacturer is based on cost pressure at present, generally Oxygen-free copper is purchased as contact, oxygen-free copper has good conductive, heating conduction, but arc resistant ablation, heavy current impact Can be poor, and use the dispersion-strengthened Cu material cost of better performances high, process is complicated, is unable to satisfy the price request in market;Cause This is badly in need of a kind of low cost, high performance material to substitute present oxygen-free copper, improves high voltage direct current relay service performance simultaneously, Also there is high cost performance.
In existing technology, is studied seldom for the slider material of high voltage direct current relay, be mainly based upon existing low pressure The continuity or optimization of relay contact.But high voltage direct current relay is higher with respect to the performance of traditional relay, reliability requirement, and And put forward new requirements, and although existing silver-based contact, copper tungsten point solve subproblem, but cannot fully meet height Straightening current relay requirement, as the arc resistant of silver-based contact is ablative and resistance fusion welding can be poor and at high cost;Copper tungsten contact is resistance to Load current ability and connecting-disconnecting function are lower, and two kinds of material welding difficulties are big, are not suitable for mass production.
Summary of the invention
In view of the above problems, the present invention provides a kind of preparation sides of high voltage direct current contact for relay material Method.
The technical scheme is that a kind of preparation method of high voltage direct current contact for relay material, which is characterized in that It mainly comprises the steps that
(1) ingredient: weighing fine aluminium block and non-oxygen copper bar is raw material, by weight percentage, including 0.1%-1% aluminium, surplus For copper, wherein non-oxygen copper bar purity is 99.9%, and fine aluminium block purity is 99.95%;
(2) melting: by the non-oxygen copper bar of said ratio and fine aluminium it is packaged enter vacuum atomizing equipment in, be first evacuated to 10pa Hereinafter, heating carries out melting, smelting temperature is 1200-1500 DEG C, and vacuum aerosolization, system are carried out after non-oxygen copper bar all melts Standby copper-aluminum alloy powder;
(3) internal oxidition: the above-mentioned copper aluminium powder prepared is packed into autoclave, is passed through the oxygen that purity is greater than 99.9% Gas is heated to 600-1000 DEG C, makes the fully oxidized generation copper oxide of copper aluminium powder and alumina powder, soaking time 2-4h;It takes out again true Copper oxide is reduced to fine copper, alumina particle disperse hereinafter, be passed through the hydrogen that purity is greater than 99.5% by empty to less than 0.2pa It is distributed in formation dispersion-strengtherning copper powder in copper powder;
(4) powder mixes: in the high-melting-point alloy for adding WC, Ti, W in the dispersion-strengtherning copper powder of above-mentioned internal oxidition preparation One or more, additive amount is copper aluminium powder 0.1-20%, is then mixed using ball mill;
(5) compression moulding: the above-mentioned alloy powder mixed is subjected to compacting using press and forms green compact, pressing pressure is 500-1500Mpa, dwell time 1-10s;
(6) it is sintered: the above-mentioned green compact suppressed being sintered in vacuum or gas hydrogen sintering furnace, maximum sintering temperature is 800-1100 DEG C, keep the temperature 1-4h;
(7) above-mentioned sintered briquet multiple pressure: is carried out to multiple pressure, pressure 1000-1600Mpa again;
(8) resintering: carrying out double sintering to the briquet after above-mentioned multiple pressure again, and sintering temperature is 500-1000 DEG C, when heat preservation Between can prepare high-performance slider material for 1-4h.
Further, the inert gas is the mixed gas of the one or both of argon gas or nitrogen, atomizing pressure 3- 8Mpa, the shock by above-mentioned gas to alloy solution after melting make aluminium alloy form miniature droplets, and will not send out with aluminium alloy Raw reaction, guarantees the purity of alloy powder.
Further, when carrying out vacuum aerosolization operation in the step (2), detailed process are as follows: by the alloy of fusing Liquid pours into bottom pour ladle, aluminium alloy with the rate of 8-15L/min by outflow of leting slip a remark during, be 0.6-8MPa using pressure Atomization gas is sprayed, and aluminium alloy is dispersed into fine drop, forms Al alloy powder after cooled and solidified during landing End facilitates the particle size of control aluminium alloy droplet by controlling the pressure and alloy flow velocity of atomization gas.
Further, the granularity requirements of the copper-aluminium alloy powder prepared in the step (2) are -100 mesh or less.
Further, in the mechanical milling process in the step (4), polyvinylpyrrolidone, silane are added into ball mill Coupling agent, by the effect of polyvinylpyrrolidone and silane coupling agent, the mixed-powder particle diameter distribution after making ball milling is small, reduces Reunite, avoids the segregation of preparation.
Further, the mixed-powder after ball milling is subjected to plasma spheroidization in the step (4), wherein powder feeding rate For 60-150g/min, plasma output power is 60-80KW, obtains the spherical mixed-powder of uniform particle sizes, passes through plasmasphere Change technology handles the powder after ball milling, increases the uniformity of mixed-powder partial size, by will be after above-mentioned plasma spheroidization Alloy powder compression moulding, the alloy green compact of even tissue can be obtained, alloying component is avoided to be segregated.
Further, ratio of grinding media to material is 1:5-5:1, Ball-milling Time 1-10h in the step (4), if ratio of grinding media to material is greater than 5:1 will increase the impact friction between abrasive body, and idle work increases, and increase power consumption and abrasion, mixture yield reduces;Such as Fruit ratio of grinding media to material is less than 1:5, illustrates that retaining amount is excessive in ball mill, works as a buffer, and crosses crushing phenomenon and increases, can also reduce grinding Efficiency.
Further, detailed process is sintered to blank in the step (6) are as follows: S1: preheating: the blank of compression moulding is put Enter in vacuum or gas hydrogen sintering furnace, is first preheated with 300-500 DEG C of temperature, and keep the temperature 1-2h;S: gradient increased temperature sintering: will Blank temperature after above-mentioned preheating rises to 800-1050 DEG C with 30-55 DEG C of heating rate, 2-3h is kept the temperature, by preheat With the mode of gradient increased temperature, avoids sintering temperature variation is too fast from leading to blank cracking and inhomogeneous deformation, influence contact material Preparation.
Further, when the mode annealed in the step (5) is stress relief annealing, concrete operations are as follows: S1: with 55- The heating rate of 60 DEG C/h preheats annealing furnace, until temperature rises to 630-650 DEG C, is then put into the blank through forging hammer In annealing furnace after preheating, 2-3h is kept the temperature;S2: being passed through nitrogen thereto, then with the heating rate of 200-250 DEG C/h to annealing Furnace is heated at high temperature, until temperature rises to 1080-1200 DEG C, and keeps the temperature 3-6h;S3: will with the rate of temperature fall of 20-25 DEG C/h The temperature of annealing furnace is down to 980-1000 DEG C, keeps the temperature 2-3h, then again with the rate of temperature fall of 65-85 DEG C/h by the temperature of annealing furnace Be down to 600-650 DEG C, and keep the temperature 4-6h, finally naturally cool to 180-200 DEG C, then take out blank, be placed in air until It is down to room temperature, is annealed by above-mentioned annealing way to blank, blank internal residual stress can be eliminated, is prevented residual Residue stress leads to blank deformation and cracking.
The beneficial effects of the present invention are:
(1) present invention is a kind of preparation method of high voltage direct current contact for relay material newly developed, technical process letter Single, low cost and high performance high voltage direct current contact for relay material has very high property while meeting service performance Valence ratio, alternative current fine copper contact, greatly improves the reliability of high voltage direct current relay.
(2) present invention mainly shows the advantage in terms of material final performance, when Al contains by the control to aluminium content When amount is less than 0.1%, the product is without apparent performance advantage with fine copper compared with, but when Al content is higher than 1%, the addition of Al makes Product conductivity reduces excessively, is unfavorable for the conduction of relay.
(3) since dispersion-strengtherning copper powder hardness is higher, spherical powder is not easy to shape, so the present invention carries out compacting and two twice Secondary sintering, wherein first compacting first carries out being shaped to blank, and material stress is removed after just burning, and reduces deformation intensity;Second of pressure Purpose processed is to carry out shaping, reaches final products size, reduces subsequent machine and add process, the machinery of material can be improved in second of resintering Intensity and toughness of material are conducive to the service life of material, which reaches million times, therefore need secondary Sintering improves the strength of materials.
(4) present invention controls sintering temperature by way of preheating with gradient increased temperature, sintering temperature is avoided to become in sintering Change it is too fast cause blank crack and inhomogeneous deformation, influence the preparation of contact material.
(5) present invention passes through the high-melting-point alloys such as middle in dispersion-strengtherning copper powder prepared by internal oxidition addition WC, Ti, W, energy Enough size of current according to high-voltage relay, the arc resistant ablation property and resistance fusion welding for targetedly improving material can be poor.
Detailed description of the invention
Fig. 1 is process flow chart of the invention;
Fig. 2 is the metallographic microscope of contact material of the invention;
Fig. 3 is the product figure of contact material of the invention.
Specific embodiment
Technical solution of the present invention is further discussed in detail with reference to embodiments, but protection scope of the present invention It is not limited thereto.
Embodiment 1
It is mainly comprised the steps that using the method for method preparation high voltage direct current contact for relay material of the invention
(1) ingredient: weighing fine aluminium block and non-oxygen copper bar is raw material, by weight percentage, including 0.1% aluminium, 99.9% is Copper, wherein non-oxygen copper bar purity is 99.9%, and fine aluminium block purity is 99.95%;
(2) melting: by the non-oxygen copper bar of said ratio and fine aluminium it is packaged enter vacuum atomizing equipment in, be first evacuated to 10pa, heating carry out melting, and smelting temperature is 1200 DEG C, carry out vacuum aerosolization after non-oxygen copper bar all melts, prepare Partial size is -100 mesh copper-aluminum alloy powders;
(3) internal oxidition: the above-mentioned copper aluminium powder prepared is packed into autoclave, is passed through the oxygen that purity is 99.9% Gas is heated to 600 DEG C, makes the fully oxidized generation copper oxide of copper aluminium powder and alumina powder, soaking time 2h;It is evacuated to again 0.2pa is passed through the hydrogen of purity 99.5%, copper oxide is reduced to fine copper, alumina particle Dispersed precipitate is formed in copper powder Dispersion-strengtherning copper powder;
(4) powder mixes: WC is added in the dispersion-strengtherning copper powder of above-mentioned internal oxidition preparation, additive amount is copper aluminium powder 0.1%, then mixed using ball mill, wherein ratio of grinding media to material 1:5, Ball-milling Time 1h, if ratio of grinding media to material is less than 1:5, Illustrate that retaining amount is excessive in ball mill, works as a buffer, crosses crushing phenomenon and increase, can also reduce mill efficiency;
(5) compression moulding: the above-mentioned alloy powder mixed is subjected to compacting using press and forms green compact, pressing pressure is 500Mpa, dwell time 1s;
(6) it is sintered: the above-mentioned green compact suppressed being sintered in vacuum or gas hydrogen sintering furnace, maximum sintering temperature is 800 DEG C, keep the temperature 1h;
(7) above-mentioned sintered briquet multiple pressure: is carried out to multiple pressure, pressure 1000Mpa again;
(8) resintering: double sintering is carried out again to the briquet after above-mentioned multiple pressure, sintering temperature is 500 DEG C, soaking time 1h High-performance slider material can be prepared.
Embodiment 2
It is mainly comprised the steps that using the method for method preparation high voltage direct current contact for relay material of the invention
(1) ingredient: weighing fine aluminium block and non-oxygen copper bar is raw material, by weight percentage, including 0.5% aluminium, 99.5% bronze medal, Wherein, non-oxygen copper bar purity is 99.9%, and fine aluminium block purity is 99.95%;
(2) melting: by the non-oxygen copper bar of said ratio and fine aluminium it is packaged enter vacuum atomizing equipment in, be first evacuated to 9pa, Heating carries out melting, and smelting temperature is 1400 DEG C, carries out vacuum aerosolization after non-oxygen copper bar all melts, prepares partial size For -100 mesh copper-aluminum alloy powders;
(3) internal oxidition: the above-mentioned copper aluminium powder prepared being packed into autoclave, the oxygen of purity 99.9% is passed through, 800 DEG C are heated to, the fully oxidized generation copper oxide of copper aluminium powder and alumina powder, soaking time 3h are made;It is evacuated to 0.1pa again, It is passed through the hydrogen of purity 99.5%, copper oxide is reduced to fine copper, it is strong that alumina particle Dispersed precipitate forms disperse in copper powder Change copper powder;
(4) powder mixes: WC, Ti is added in the dispersion-strengtherning copper powder of above-mentioned internal oxidition preparation, additive amount is copper aluminium powder 11%, it is then mixed using ball mill, wherein ratio of grinding media to material 1:3, Ball-milling Time 5h;
(5) compression moulding: the above-mentioned alloy powder mixed is subjected to compacting using press and forms green compact, pressing pressure is 800Mpa, dwell time 5s;
(6) it is sintered: the above-mentioned green compact suppressed being sintered in vacuum or gas hydrogen sintering furnace, maximum sintering temperature is 1000 DEG C, keep the temperature 2h;
(7) above-mentioned sintered briquet multiple pressure: is carried out to multiple pressure, pressure 1400Mpa again;
(8) resintering: double sintering is carried out again to the briquet after above-mentioned multiple pressure, sintering temperature is 800 DEG C, soaking time 2h High-performance slider material can be prepared.
Embodiment 3
It is mainly comprised the steps that using the method for method preparation high voltage direct current contact for relay material of the invention
(1) ingredient: weighing fine aluminium block and non-oxygen copper bar is raw material, by weight percentage, including 1% aluminium, 99% is copper, In, non-oxygen copper bar purity is 99.9%, and fine aluminium block purity is 99.95%;
(2) melting: by the non-oxygen copper bar of said ratio and fine aluminium it is packaged enter vacuum atomizing equipment in, be first evacuated to 8pa, Heating carries out melting, and smelting temperature is 1500 DEG C, carries out vacuum aerosolization after non-oxygen copper bar all melts, prepares partial size For -100 mesh copper-aluminum alloy powders;
(3) internal oxidition: the above-mentioned copper aluminium powder prepared being packed into autoclave, the oxygen of purity 99.9% is passed through, 1000 DEG C are heated to, the fully oxidized generation copper oxide of copper aluminium powder and alumina powder, soaking time 4h are made;It is evacuated to 0.2pa again, It is passed through the hydrogen of purity 99.5%, copper oxide is reduced to fine copper, it is strong that alumina particle Dispersed precipitate forms disperse in copper powder Change copper powder;
(4) powder mixes: in the high-melting-point alloy for adding WC, Ti, W in the dispersion-strengtherning copper powder of above-mentioned internal oxidition preparation One or more, additive amount is copper aluminium powder 20%, is then mixed using ball mill, wherein ratio of grinding media to material 5:1, ball milling Time is 10h;
(5) compression moulding: the above-mentioned alloy powder mixed is subjected to compacting using press and forms green compact, pressing pressure is 1500Mpa, dwell time 10s;
(6) it is sintered: the above-mentioned green compact suppressed being sintered in vacuum or gas hydrogen sintering furnace, maximum sintering temperature is 1100 DEG C, keep the temperature 4h;
(7) above-mentioned sintered briquet multiple pressure: is carried out to multiple pressure, pressure 1600Mpa again;
(8) resintering: double sintering is carried out again to the briquet after above-mentioned multiple pressure, sintering temperature is 1000 DEG C, and soaking time is 4h can prepare high-performance slider material.
Embodiment 4
The present embodiment is substantially the same manner as Example 2, the difference is that:
When carrying out vacuum aerosolization operation in step (2), detailed process are as follows: the aluminium alloy of fusing is poured into bottom pour ladle, Aluminium alloy with the rate of 12L/min by outflow of leting slip a remark during, using pressure be 4MPa atomization gas sprayed, will Aluminium alloy is dispersed into fine drop, forms Al alloy powder after cooled and solidified during landing, by controlling atomization gas Pressure and alloy flow velocity, facilitate control aluminium alloy droplet particle size, wherein inert gas be argon gas and nitrogen, Atomizing pressure is 5Mpa, the shock by above-mentioned gas to alloy solution after melting, so that aluminium alloy is formed miniature droplets, and will not It reacts with aluminium alloy, guarantees the purity of alloy powder.
Embodiment 5
The present embodiment and embodiment 4 are substantially different, the difference is that:
In mechanical milling process in step (4), polyvinylpyrrolidone, silane coupling agent are added into ball mill, by poly- The effect of vinylpyrrolidone and silane coupling agent, the mixed-powder particle diameter distribution after making ball milling is small, reduces and reunites, avoids preparing Segregation, the mixed-powder after ball milling carries out plasma spheroidization, wherein powder feeding rate 120g/min, plasma output Power is 70KW, obtains the spherical mixed-powder of uniform particle sizes, by plasma spheroidization technology to the powder after ball milling at Reason increases the uniformity of mixed-powder partial size, by that can obtain the alloy powder compression moulding after above-mentioned plasma spheroidization The alloy green compact of even tissue, avoid alloying component inclined.
Embodiment 6
The present embodiment and embodiment 5 are substantially different, the difference is that:
Detailed process is sintered to blank in step (6) are as follows: S1: the blank of compression moulding preheating: being put into vacuum or gas hydrogen In sintering furnace, first preheated with 400 DEG C of temperature, and keep the temperature 1.5h;S: gradient increased temperature sintering: by the blank after above-mentioned preheating Temperature rises to 950 DEG C with 45 DEG C of heating rate, keeps the temperature 2.2h, avoiding burning in a manner of preheating with gradient increased temperature Junction temperature variation is too fast to lead to blank cracking and inhomogeneous deformation, influences the preparation of contact material.
Embodiment 7
When the mode annealed in step (5) is stress relief annealing, concrete operations are as follows: S1: with the heating rate pair of 60 DEG C/h Annealing furnace is preheated, until temperature rises to 640 DEG C, then by the annealing furnace after the blank of forging hammer is put into preheating, is kept the temperature 2.5h;S2: being passed through nitrogen thereto, is then heated at high temperature with the heating rate of 230 DEG C/h to annealing furnace, until temperature liter To 1100 DEG C, and keep the temperature 4h;S3: the temperature of annealing furnace is down to 990 DEG C with the rate of temperature fall of 23 DEG C/h, keeps the temperature 2.5h, then The temperature of annealing furnace is down to 630 DEG C with the rate of temperature fall of 75 DEG C/h again, and keeps the temperature 5h, finally naturally cools to 190 DEG C, then Blank is taken out, is placed in air up to being down to room temperature, is annealed, can be eliminated to blank by above-mentioned annealing way Blank internal residual stress, prevents residual stress from leading to blank deformation and cracking.
Test example
By high voltage direct current relay contact material prepared by the embodiment of the present invention 1-7 correlation performance parameters such as Shown in table 1:
Table 1: the correlation performance parameters table of contact material
It can be obtained by table 1, when the weight percent of Al is 0.13-0.17%, the conductivity of alloy is 85-88%, firmly Degree is 115-135, density 8.60;When the weight percent of Al is 0.17-0.25%, the conductivity of alloy is 80-84, firmly Degree be 132-150, density 8.51, it follows that prepared by the method high voltage direct current contact for relay material with it is pure Copper is high compared to conductivity, is conducive to the conduction of relay, hardness and density are big, and mechanical strength and the material that can be improved material are tough Property, be conducive to the service life of material, which reaches million times, therefore double sintering is needed to improve material Intensity.

Claims (8)

1. a kind of preparation method of high voltage direct current contact for relay material, which is characterized in that mainly comprise the steps that
(1) ingredient: weighing fine aluminium block and non-oxygen copper bar is raw material, and by weight percentage, including 0.1%-1% aluminium, surplus are copper, Wherein, non-oxygen copper bar purity is 99.9%, and fine aluminium block purity is 99.95%;
(2) melting: by the non-oxygen copper bar of said ratio and fine aluminium it is packaged enter vacuum atomizing equipment in, be first evacuated to 10pa with Under, heating carries out melting, and smelting temperature is 1200-1500 DEG C, and vacuum aerosolization, preparation are carried out after non-oxygen copper bar all melts Copper-aluminum alloy powder;
(3) internal oxidition: the above-mentioned copper aluminium powder prepared is packed into autoclave, is passed through the oxygen that purity is greater than 99.9%, It is heated to 600-1000 DEG C, makes the fully oxidized generation copper oxide of copper aluminium powder and alumina powder, soaking time 2-4h;It is evacuated to again Less than 0.2pa hereinafter, being passed through the hydrogen that purity is greater than 99.5%, copper oxide is reduced to fine copper, alumina particle Dispersed precipitate Dispersion-strengtherning copper powder is formed in copper powder;
(4) powder mixes: one in the high-melting-point alloy of WC, Ti, W is added in the dispersion-strengtherning copper powder of above-mentioned internal oxidition preparation Kind is several, and additive amount is copper aluminium powder 0.1-20%, is then mixed using ball mill;
(5) compression moulding: the above-mentioned alloy powder mixed is subjected to compacting using press and forms green compact, pressing pressure 500- 1500Mpa, dwell time 1-10s;
(6) it is sintered: the above-mentioned green compact suppressed being sintered in vacuum or gas hydrogen sintering furnace, maximum sintering temperature 800- 1100 DEG C, keep the temperature 1-4h;
(7) above-mentioned sintered briquet multiple pressure: is carried out to multiple pressure, pressure 1000-1600Mpa again;
(8) resintering: double sintering is carried out again to the briquet after above-mentioned multiple pressure, sintering temperature is 500-1000 DEG C, and soaking time is 1-4h can prepare high-performance slider material.
2. a kind of preparation method of high voltage direct current contact for relay material according to claim 1, which is characterized in that institute When stating progress vacuum aerosolization operation in step (2), atomization gas is inert gas, and the inert gas is argon gas or nitrogen The mixed gas of one or both, atomizing pressure 3-8Mpa.
3. a kind of preparation method of high voltage direct current contact for relay material according to claim 2, which is characterized in that institute When stating progress vacuum aerosolization operation in step (2), detailed process are as follows: pour into the aluminium alloy of fusing in bottom pour ladle, aluminium alloy With the rate of 8-15L/min by outflow of leting slip a remark during, using pressure be 0.6-8MPa atomization gas sprayed, will Aluminium alloy is dispersed into fine drop, forms Al alloy powder after cooled and solidified during landing.
4. a kind of preparation method of high voltage direct current contact for relay material according to claim 1, which is characterized in that institute The granularity requirements for stating the copper-aluminium alloy powder prepared in step (2) are -100 mesh or less.
5. a kind of preparation method of high voltage direct current contact for relay material according to claim 1, which is characterized in that institute It states in the mechanical milling process in step (4), polyvinylpyrrolidone, silane coupling agent is added into ball mill.
6. a kind of preparation method of high voltage direct current contact for relay material according to claim 1, which is characterized in that institute It states in step (4) and the mixed-powder after ball milling is subjected to plasma spheroidization, wherein powder feeding rate 60-150g/min, plasma Output power is 60-80KW, obtains the spherical mixed-powder of uniform particle sizes.
7. a kind of preparation method of high voltage direct current contact for relay material according to claim 1, which is characterized in that institute Stating ratio of grinding media to material in step (4) is 1:5-5:1, Ball-milling Time 1-10h.
8. a kind of preparation method of high voltage direct current contact for relay material according to claim 1, which is characterized in that institute It states in step (6) and detailed process is sintered to blank are as follows: S1: the blank of compression moulding preheating: being put into vacuum or gas hydrogen sintering furnace It is interior, it is first preheated with 300-500 DEG C of temperature, and keep the temperature 1-2h;S: gradient increased temperature sintering: by the blank temperature after above-mentioned preheating Degree rises to 800-1050 DEG C with 30-55 DEG C of heating rate, keeps the temperature 2-3h.
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