CN109994327B - AgMe contact material for circuit breaker and preparation method thereof - Google Patents
AgMe contact material for circuit breaker and preparation method thereof Download PDFInfo
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- C22C1/04—Making non-ferrous alloys by powder metallurgy
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- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/05—Mixtures of metal powder with non-metallic powder
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- C22C27/04—Alloys based on tungsten or molybdenum
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
- C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
- C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
- C22C29/08—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds based on tungsten carbide
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- C22C30/02—Alloys containing less than 50% by weight of each constituent containing copper
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- C22C32/0047—Non-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 carbides, nitrides, borides or silicides as the main non-metallic constituents
- C22C32/0052—Non-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 carbides, nitrides, borides or silicides as the main non-metallic constituents only carbides
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C5/00—Alloys based on noble metals
- C22C5/06—Alloys based on silver
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/02—Contacts characterised by the material thereof
- H01H1/021—Composite material
- H01H1/023—Composite material having a noble metal as the basic material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
- H01H11/04—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
- H01H11/04—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts
- H01H11/048—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts by powder-metallurgical processes
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- 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
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
Abstract
The invention discloses an AgMe contact material for a circuit breaker and a preparation method thereof, wherein the AgMe contact material comprises the following components in parts by weight: firstly, premixing Ag powder, Me powder and additive powder to obtain AgMe mixed powder; secondly, carrying out high-speed and low-speed alternative wet ball milling on the obtained AgMe mixed powder; thirdly, carrying out wet glue mixing granulation on the powder subjected to wet ball milling, and drying; fourthly, molding and pressing the granulated powder to obtain an AgMe green body; fifthly, degumming and sintering the AgMe green body to obtain an AgMe porous framework; and sixthly, carrying out infiltration sintering on the AgMe porous framework subjected to degumming and sintering and Ag to obtain the AgMe electrical contact material. The hardness of the material of the invention is obviously higher than that of AgMe electrical contact material prepared by the traditional method, the breaking capacity and the electrical service life of the contact material are improved, and the invention has simple operation and high yield and is suitable for large-scale production.
Description
Technical Field
The invention relates to an electrical contact material in the technical field of materials and a preparation method thereof, in particular to a preparation method of an AgMe (Me is tungsten W or tungsten carbide WC) contact for a low-voltage circuit breaker and the AgMe contact material prepared by the method.
Background
The AgMe series electrical contact material is used as a new generation contact material, wherein Me is tungsten W or tungsten carbide WC, the characteristics of good electric conduction and heat conduction performance of Ag and high melting point, high hardness and the like of Me are mainly utilized, the AgMe series electrical contact material can be subjected to strong arc corrosion, has good fusion welding resistance and abrasion resistance, successfully replaces AgCdO and AgNi alloy, and is widely applied to various low-voltage electrical appliances such as small-sized circuit breakers, molded case circuit breakers and the like at present.
At present, in the circuit breakers at home and abroad, AgMe is mainly used as a moving contact material, and the fixed contact material matched with the moving contact material generally adopts AgC, AgMeC12C3 or AgNi30C3 and the like. The AgMe is used as a contact material, the requirement on the particle dispersibility in the material is high, the Me aggregation phenomenon often exists in the traditional AgMe contact material, so that silver particles in the material cannot penetrate into the material to generate holes, and meanwhile, the resistivity of the Me material is high, so that the resistivity of the contact material can be increased due to the two factors, and the use performance of the material is reduced.
At present, two processes for producing AgMe contact alloy are mainly used, and when the weight percentage of Me is less than 35%, such as AgW35 and AgWC30 alloy preparation, a cold-pressing sintering process after dry powder mixing is generally adopted. For example: 1) the Chinese patent with the application number of 201110246662.3 relates to a composite electric contact material and a preparation method thereof. When the weight percentage of W is more than 35 percent, such as AgMe40, AgMe50 and AgMe55 alloy preparation, a dry powder mixing and infiltration sintering process is generally adopted. For example: 2) chinese patent No. CN201710953299.6, a preparation method of an ultrafine high-dispersion silver-tungsten electrical contact material. In the process, the powder is directly formed after being mixed by a dry method, and the requirements on the original dispersibility and particle size of the raw silver powder or the additive powder are higher. Chinese patent CN201810328475.1, a silver-tungsten electrical contact material and a preparation method thereof, proposes that AgW matrix powder is prepared by a chemical coating method, and then the AgW electrical contact material is prepared by a infiltration process. However, the process has the disadvantages of complicated preparation process and complex process, and has higher requirements on the production environment and equipment involved in the preparation process.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a preparation method of an AgMe contact material for a circuit breaker, which disperses AgMe (Me is tungsten W or tungsten carbide WC) powder by adopting a wet ball milling process, and the prepared silver point inner particles are in a uniform dispersion state, and the silver point has good high-temperature mechanical strength, stable contact strength and greatly improved arc ablation resistance. Meanwhile, the process is simple, the operation is convenient, and the cost is low.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention provides a preparation method of an AgMe contact material for a circuit breaker, which comprises the following steps:
firstly, premixing Ag powder, Me powder and additive powder to obtain AgMe mixed powder, wherein: the content of the Me powder is not lower than 35 percent of the total weight of the mixed powder, the content of the additive powder is not higher than 3 percent of the total weight of the mixed powder, and the balance is Ag powder;
secondly, carrying out high-speed and low-speed alternative wet ball milling on the obtained AgMe mixed powder;
thirdly, carrying out wet glue mixing granulation on the powder subjected to wet ball milling, and drying;
fourthly, molding and pressing the granulated powder to obtain an AgMe green body;
fifthly, degumming and sintering the AgMe green body to obtain an AgMe porous framework;
and sixthly, carrying out infiltration sintering on the AgMe porous framework subjected to degumming and sintering and Ag to obtain the AgMe electrical contact material.
The invention also provides the AgMe contact material for the circuit breaker prepared by the method.
According to the invention, the AgMe powder material with the particles dispersed and distributed is prepared by wet ball milling and wet glue mixing granulation, and the high-density AgMe contact material is prepared by cold pressing molding and a high-temperature infiltration method. The wet ball milling adopts high-speed and low-speed alternative ball milling, on one hand, the wet ball milling is adopted, the ball milling liquid can be used as a powder dispersing agent, the bonding effect among powder particles is reduced, and in addition, the Me powder oxidation caused by high temperature generated by high-speed ball milling can also be avoided. On the other hand, high-speed and low-speed alternation is adopted, high-speed ball milling enables raw material powder particles to be further broken and refined, silver particles are coated on the surfaces of the Me particles, the wettability of the Me particles with Ag melt in the infiltration process is improved, the density of the material is improved, the low-speed ball milling enables the broken powder to be further mutually dispersed, the particles in the electric contact material to be distributed more dispersedly, the temperature in the barrel is reduced, and the Me powder is prevented from being in a high-temperature high-humidity state for a long time.
The method adopts degumming, sintering and infiltration, and the degumming enables the organic matters added before to be decomposed and volatilized at low temperature, thereby being beneficial to the sintering; sintering can enable part of air holes in the green body to be discharged, the density of the green body is improved, the AgMe green body has certain physical strength, the breakage rate is reduced in the carrying and placing processes of actual production, and the yield is improved; and in the third stage of infiltration, the silver solution is filled into the AgMe blank, so that the compactness of the AgMe material is further improved, and the resistivity is reduced, so that the AgMe material has good arc ablation resistance in subsequent electrified use.
Compared with the AgMe electrical contact material prepared by the traditional method, the hardness of the AgMe electrical contact material prepared by the method is improved by 10-30%, the breaking capacity is improved by 10-20%, the electrical service life is improved by 10-30%, and the AgMe electrical contact material is simple to operate, high in yield and suitable for large-scale production.
Drawings
Fig. 1 is a metallographic structure diagram of an AgW50 material prepared according to a first embodiment of the invention.
Detailed Description
The invention is described in detail below with reference to examples, which are intended to be illustrative only and not to be construed as limiting the scope of the invention, and many insubstantial modifications and variations of the invention can be made by an engineer skilled in the art based on the teachings of the invention.
The preparation method of the AgMe contact material for the circuit breaker, provided by the invention, can be implemented according to the following steps:
in the first step, the Ag powder, Me powder and additive powder are first premixed and may be further sieved.
In the embodiment of the present invention, the parameters in this step may preferably adopt: the content of Me powder is 35-85 percent; 0.5-3% of additive powder, one or more additive elements of Fe, Ni, Co and Cu, and the balance of Ag powder. Further, in some embodiments, the powder mixing speed is between 20 rpm and 60 rpm; the powder mixing time is between 0.5 and 6 hours. The mesh number of the screen is 100-400 meshes.
And secondly, carrying out wet ball milling on the mixed powder obtained in the first step.
In the embodiment of the present invention, the parameters in this step may preferably adopt: the ball milling rotation speed adopts high and low rotation speed alternation, wherein the high rotation speed is 150-. Further, in some embodiments, the ball-to-material ratio (i.e., the weight ratio of the balls to the powder) may be between 1 and 3, the ball-milling liquid may be deionized water, absolute ethanol, or a mixture of two liquids, and the weight ratio of the ball-milling liquid to the powder is between 0.1 and 0.6: 1.
And thirdly, carrying out wet glue mixing granulation on the powder subjected to wet ball milling, and drying.
In the embodiment of the invention, the weight ratio of the ball milling liquid to the powder before glue mixing is 0.1-0.4: 1.
The glue mixing granulation comprises the following steps: the glue solution is one or more of PVA, PEG and PVP, and the weight percentage of the glue solution and the powder is 5-20%. The glue mixing temperature is 70-100 ℃. The drying temperature is 75-110 ℃.
And fourthly, performing cold press molding on the powder obtained in the third step to obtain an AgMe green body.
In the embodiment of the invention, one surface of the AgMe green body is in any shape capable of increasing the contact area with the silver solution, such as a sawtooth shape, the thickness of the AgMe green body is obtained according to the required calculation of a product, and the forming pressure is between 1 and 15 MPa.
And fifthly, degumming and sintering the AgMe green blank in the fourth step to obtain the AgMe porous skeleton.
In the embodiment of the present invention, the degummed sintering may be included in a reducing gas or vacuum, wherein the reducing gas may be hydrogen, etc. The degumming and sintering are carried out in two stages, wherein the first stage is degumming, the temperature is between 350 and 500 ℃, and the heat preservation time is between 0.5 and 10 hours; the second stage is sintering at 550-850 deg.c for 1-6 hr. In the step, the colloid in the AgMe green body is decomposed and volatilized, and partial air holes in the green body are discharged after sintering to form the AgMe porous framework. The additive elements are beneficial to the green body sintering process, so that the density of the green body is further improved.
And sixthly, carrying out infiltration sintering on the AgMe porous framework after degumming and sintering to obtain the AgMe electrical contact material.
In the embodiment of the invention, the infiltration sintering is to place Ag on the side surface or the bottom of an AgMe green body framework, melt the Ag into a liquid state at high temperature, and immerse the Ag into an AgMe porous framework under the action of capillary force to obtain the AgMe contact material with uniformly dispersed particles. Specifically, infiltration sintering can be carried out in reducing gas, wherein the reducing gas can be hydrogen gas and the like, the infiltration temperature is between 1000-1250 ℃, and the heat preservation time is between 1.5 and 10 hours; the weight ratio of Ag to AgMe porous skeleton is 0.1-0.35:1, and Ag can be Ag wire, Ag block or Ag sheet.
And seventhly, cleaning the AgMe electrical contact material obtained after infiltration and sintering.
The detailed technical operation of the present invention is explained by the following examples of specific applications.
Example one
The embodiment provides a preparation method of an AgMe contact material for a circuit breaker, which comprises the following steps:
in the first step, firstly, 65 wt% of W powder, 1 wt% of Ni powder and 34 wt% of silver powder are placed in a powder mixer for premixing, the rotating speed is 40 r/min, the time is 1 hour, and the W powder, the Ni powder and the silver powder are sieved by a 100-mesh sieve.
And in the second step, ball milling is carried out on the mixed powder obtained in the first step, the ball milling rotating speed is 60 revolutions per minute and 150 revolutions per minute, the alternation time is 0.5h, the ball milling time is 5h, grinding balls and deionized water are added, and the ball material-water ratio (namely the weight ratio of the grinding balls to the powder to the deionized water) is 2:1: 0.25.
And thirdly, carrying out wet glue mixing granulation on the powder subjected to wet ball milling, adding PVA glue, wherein the glue mixing temperature is 90 ℃, the glue adding amount is 10% of the weight of the powder, and the drying temperature is 100 ℃.
And in the fourth step, cold press molding is carried out on the powder subjected to glue mixing and granulation, the molding pressure is 15MPa, and the bottom of the molded AgW65 green blank is in a sawtooth pattern.
In the fifth step, the formed AgW65 green compact is degummed and sintered in stages, wherein the degummed temperature is 500 ℃, the degummed time is 8 hours in the first stage, the sintering temperature is 800 ℃, the sintering time is 4 hours in the second stage, and the atmosphere is H2。
And in the sixth step, placing the degummed and sintered AgW65 porous skeleton on an Ag sheet, and carrying out infiltration sintering to prepare AgW 50. The parameters can adopt: the infiltration temperature is 1100 ℃; the heat preservation time is 3.5 hours, and the infiltration atmosphere is H2。
And in the seventh step, cleaning the blank obtained after shaping.
The AgW50 electrical contact material with better performance is finally obtained in the embodiment, wherein the silver point hardness HV5 is 125, the material tissue is dispersed uniformly, and the material is qualified after being subjected to 50-time test by 6-time breaking of 250A current.
Example two
The embodiment provides a preparation method of an AgMe contact material for a circuit breaker, which comprises the following steps:
in the first step, 50 wt% of WC powder, 1.5 wt% of Fe powder, 1 wt% of Co powder, 0.5 wt% of Cu powder and 48 wt% of silver powder are placed in a powder mixer for premixing, the rotating speed is 30 revolutions per minute, the time is 4 hours, and the mixture is sieved by a 200-mesh sieve.
And in the second step, ball milling is carried out on the mixed powder obtained in the first step, the ball milling rotating speed is 100 revolutions per minute and 250 revolutions per minute, the alternation time is 1h, the ball milling time is 8 h, grinding balls and absolute ethyl alcohol are added, and the ball material-to-ethyl alcohol ratio (namely the weight ratio of the grinding balls to the powder to the absolute ethyl alcohol) is 1:1: 0.1.
And thirdly, carrying out wet glue mixing granulation on the powder subjected to wet ball milling, adding PVP glue, wherein the glue mixing temperature is 75 ℃, the glue adding amount is 15% of the weight of the powder, and the drying temperature is 75 ℃.
And in the fourth step, cold press molding is carried out on the powder subjected to glue mixing granulation, the molding pressure is 20MPa, and the bottom of the molded AgWC50 green blank is in a grid pattern.
In the fifth step, the formed AgWC50 green compact is degummed and sintered in stages, wherein the degummed temperature is 350 ℃, the degummed time is 6 hours in the first stage, the sintering temperature is 850 ℃, the sintering time is 6 hours in the second stage, and the atmosphere is H2。
And in the sixth step, placing the AgWC50 porous skeleton after degumming and sintering on one side of the Ag wire, and carrying out infiltration sintering to prepare AgWC 40. The parameters can adopt: the infiltration temperature is 1000 ℃; the heat preservation time is 10 hours, and the infiltration atmosphere is H2。
And in the seventh step, cleaning the blank obtained after shaping.
The AgWC40 electrical contact material with good performance is finally obtained in the embodiment, wherein the silver point hardness HV5 is 145, the material tissue is dispersed uniformly, the material is qualified after being subjected to 6-time breaking of 400A current for 50 times, and the electrical life test result is 5000 times.
EXAMPLE III
The embodiment provides a preparation method of an AgMe contact material for a circuit breaker, which comprises the following steps:
in the first step, 68.5 wt% of W powder, 1.0 wt% of Ni powder, 0.5 wt% of Cu powder and 30 wt% of silver powder are placed in a powder mixer for premixing, the rotating speed is 20 r/min, the time is 6 hours, and the mixture is sieved by a 400-mesh sieve.
And in the second step, ball milling is carried out on the mixed powder obtained in the first step, the ball milling rotating speed is 300 revolutions per minute and 60 revolutions per minute, the alternating time is 0.5h, the ball milling time is 24 h, grinding balls and acetone are added, and the ball material acetone ratio (namely the weight ratio of the grinding balls to the powder to the acetone) is 3:1: 0.6.
And thirdly, carrying out wet glue mixing granulation on the powder subjected to wet ball milling, adding PEG glue, wherein the glue mixing temperature is 100 ℃, the glue adding amount is 20% of the weight of the powder, and the drying temperature is 110 ℃.
And in the fourth step, cold press molding is carried out on the powder subjected to glue mixing and granulation, the molding pressure is 10MPa, and the bottom of the molded AgW70 green blank is in a strip pattern.
In the fifth step, the formed AgW70 green compact is degummed and sintered in stages, wherein the degummed temperature is 450 ℃, the degummed time is 0.5 hour in the first stage, the sintering temperature is 650 ℃, the sintering time is 6 hours in the second stage, and the atmosphere is H2。
And in the sixth step, placing the degummed and sintered AgW70 porous skeleton on one side of the Ag wire, and carrying out infiltration sintering to prepare AgW 55. The parameters can adopt: the infiltration temperature is 1250 ℃; the sintering time is 3 hours, and the sintering atmosphere is H2。
And in the seventh step, cleaning the blank obtained after shaping.
The AgW55 electrical contact material with good performance is finally obtained in the embodiment, wherein the silver point hardness HV5 is 135, the material tissue is dispersed uniformly, and the material is qualified after being subjected to 50 times of tests after being subjected to 6-time disjunction of 100A current.
Example four
The embodiment provides a preparation method of an AgMe contact material for a circuit breaker, which comprises the following steps:
in the first step, 37 wt% of WC powder, 1.5 wt% of Fe powder, 1.0 wt% of Ni powder, 0.5 wt% of Cu powder and 60 wt% of silver powder are placed in a powder mixer for premixing, the rotating speed is 40 r/min, the time is 2 hours, and the mixture is sieved by a 300-mesh sieve.
And in the second step, ball milling is carried out on the mixed powder obtained in the first step, the ball milling rotating speed is 200 revolutions per minute and 60 revolutions per minute, the alternation time is 0.5h, the ball milling time is 2 h, grinding balls and deionized water are added, and the ball material-water ratio (namely the weight ratio of the grinding balls to the powder to the water) is 1.5:1: 0.4.
And thirdly, carrying out wet glue mixing granulation on the powder subjected to wet ball milling, adding PVA glue, wherein the glue mixing temperature is 70 ℃, the glue adding amount is 20% of the weight of the powder, and the drying temperature is 100 ℃.
And in the fourth step, cold press molding is carried out on the powder subjected to glue mixing granulation, the molding pressure is 10MPa, and the bottom of the molded AgWC40 green blank is in a strip pattern.
In the fifth step, the formed AgWC40 green compact is degummed and sintered in stages, wherein the degummed temperature is 400 ℃, the degummed time is 1 hour in the first stage, the sintering temperature is 550 ℃, the sintering time is 1 hour in the second stage, and the atmosphere is H2。
And in the sixth step, placing the AgWC40 porous skeleton after degumming and sintering on one side of the Ag wire, and carrying out infiltration sintering to prepare AgWC 30. The parameters can adopt: the infiltration temperature is 1000 ℃; the heat preservation time is 5 hours, and the infiltration atmosphere is H2。
And in the seventh step, cleaning the blank obtained after shaping.
The AgWC30 electrical contact material with good performance is finally obtained in the embodiment, wherein the silver point hardness HV5 is 105, the material tissue is uniformly dispersed, and the 100A current electrical life test is 4000 times.
As shown in fig. 1, the metallographic structure of the AgW50 material obtained in the above embodiment of the present invention is as follows: the silver particles and the W particles are distributed in a dispersed mode, the silver particles are in a slender strip shape, the W particles are wrapped in the silver particles, and small-size silver particles are clamped in part of the W particles.
The above description is only a partial example of the present invention and is not intended to limit the technical scope of the present invention, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A preparation method of an AgMe contact material for a circuit breaker is characterized by comprising the following steps:
firstly, premixing Ag powder, Me powder and additive powder to obtain AgMe mixed powder, wherein: the content of the Me powder is not lower than 35 percent of the total weight of the mixed powder, the content of the additive powder is not higher than 3 percent of the total weight of the mixed powder, and the balance is Ag powder;
secondly, carrying out high-speed and low-speed alternative wet ball milling on the obtained AgMe mixed powder;
thirdly, carrying out wet glue mixing granulation on the powder subjected to wet ball milling, and drying;
fourthly, molding and pressing the granulated powder to obtain an AgMe green body;
fifthly, degumming and sintering the AgMe green body to obtain an AgMe porous framework;
and sixthly, carrying out infiltration sintering on the AgMe porous framework subjected to degumming and sintering and Ag to obtain the AgMe electrical contact material.
2. The preparation method of the AgMe contact material for the circuit breaker according to claim 1, wherein in the first step, the weight content of Me powder is 35-85%, the weight content of additive powder is 0.5-3%, and the additive elements are one or more of Fe, Ni, Co and Cu.
3. The method for preparing an AgMe contact material for circuit breakers of claim 1, wherein in the second step, the high and low speeds are wet ball milled alternately, wherein: the high rotation speed is 150-300 r/min, the low rotation speed is 60-150 r/min, the alternating time is 0.2-2 hours, and the ball milling time is 2-24 hours.
4. The method for preparing an AgMe contact material for circuit breakers of claim 3, wherein the high and low speed alternate wet ball milling is carried out, wherein: the ball-material ratio, namely the weight ratio of the ball to the powder is 1-3, the ball-milling liquid adopts deionized water, absolute ethyl alcohol or the mixture of the two liquids, and the weight ratio of the ball-milling liquid to the powder is 0.1-0.6: 1.
5. The method for preparing an AgMe contact material for circuit breakers of claim 1, wherein in the third step, the wet size granulation is carried out, wherein: the weight ratio of the ball milling liquid to the powder before glue mixing is 0.1-0.4:1, the glue solution is one or more mixed solution of PVA, PEG and PVP, the weight percentage of the glue solution and the powder is 5-20%, and the glue mixing temperature is 70-100 ℃.
6. The method for preparing an AgMe contact material for circuit breakers of claim 1, wherein in the fourth step, the forming press is a cold press forming, wherein: one surface of the AgMe green body is in any shape capable of increasing the contact area with the silver solution, the thickness of the AgMe green body is obtained according to the required calculation of a product, and the forming pressure is 1-15 MPa.
7. The method for preparing an AgMe contact material for circuit breakers of claim 1, wherein in the fifth step, the debinding and sintering are carried out in a reducing gas or vacuum in two stages:
the first stage is degumming, the temperature is between 350 and 500 ℃, and the heat preservation time is between 0.5 and 10 hours;
the second stage is sintering at 550-850 deg.c for 1-6 hr.
8. The method for preparing the AgMe contact material for circuit breakers of any one of claims 1-7, wherein in the sixth step, the infiltration sintering is carried out by placing Ag on the side or bottom of an AgMe green skeleton, melting the Ag into a liquid state at high temperature, and immersing the Ag into an AgMe porous skeleton under the action of capillary force to obtain the AgMe contact material with uniformly dispersed particles.
9. The method of claim 8, wherein the infiltration sintering is performed in a reducing atmosphere, wherein: the infiltration temperature is between 1000 and 1250 ℃, and the heat preservation time is between 1.5 and 10 hours; the weight ratio of the Ag to the AgMe porous skeleton is 0.1-0.35: 1.
10. An AgMe contact material for circuit breakers prepared by the process of any one of claims 1 to 9.
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| CN114086014B (en) * | 2021-11-10 | 2022-08-05 | 浙江福达合金材料科技有限公司 | Method for preparing AgNi electric contact material based on foaming infiltration process and product thereof |
| CN114086023B (en) * | 2021-11-10 | 2022-08-05 | 浙江福达合金材料科技有限公司 | Method for preparing copper-based electric contact material based on foaming infiltration process and product thereof |
| CN116904787B (en) * | 2023-07-14 | 2024-03-19 | 苏州市希尔孚新材料股份有限公司 | Preparation method of silver-saving high-performance silver tungsten carbide nickel contact |
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