CN109500391A - A kind of preparation method of high ductility silver zinc oxide contact material - Google Patents
A kind of preparation method of high ductility silver zinc oxide contact material Download PDFInfo
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- CN109500391A CN109500391A CN201910009803.6A CN201910009803A CN109500391A CN 109500391 A CN109500391 A CN 109500391A CN 201910009803 A CN201910009803 A CN 201910009803A CN 109500391 A CN109500391 A CN 109500391A
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
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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
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/0466—Alloys based on noble metals
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- C—CHEMISTRY; METALLURGY
- 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
- 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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- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
- B22F2009/043—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by ball milling
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- B22F2201/00—Treatment under specific atmosphere
- B22F2201/10—Inert gases
- B22F2201/11—Argon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
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Abstract
The invention discloses a kind of preparation methods of high ductility silver zinc oxide contact material, the following steps are included: 1) material mixture ratio of the Ag-ZnO contact prepared as needed, the silver, zinc and additive of phase the application amount powder by atomization after melting are calculated and weighed, silver-colored zinc alloyed powder is obtained；2) silver-colored zinc alloyed powder is subjected to wet-milling under the conditions of protective atmosphere, the silver-colored zinc alloyed powder after obtaining ball milling；3) the silver-colored zinc alloyed powder after ball milling is aoxidized, obtains Ag-ZnO composite powder；4) Ag-ZnO composite powder is formed, obtains Ag-ZnO green body；5) gained Ag-ZnO green body is placed in partial pressure of oxygen >=0.8Mpa, temperature is sintered under conditions of being 900~960 DEG C, obtains the Ag-ZnO ingot blank of high ductility；6) gained Ag-ZnO ingot blank obtains Ag-ZnO wire rod or band through hot extrusion.Silver zinc oxide contact material even tissue made from the method for the invention and high ductility of tool, the processing performance of material are effectively promoted.
Description
Technical field
The present invention relates to the preparation methods of Ag-ZnO contact, and in particular to a kind of high ductility silver zinc oxide contact material
Preparation method.
Background technique
Electrical contact is the core component of various high-low switch, electric appliance, instrument and meter, component, is widely used in space flight, boat
The industrial circles such as sky, automobile and the large capacity AC/DC contactor of civilian industry, alternating current-direct current power relay, car electrics and in
In small-capacity low-pressure breaker.Electrical contact is many kinds of, and there are commonly silver-base alloy and acid bronze alloy.In silver-base alloy, silver
Cadmium oxide contact material has good resistance to arc wear, resistance fusion welding, electric conductivity and thermal conductivity, and contact resistance is small, steady
Qualitative height, referred to as " omnipotent slider material ".But since silver cadmium oxide material all exists in production and application and removal process
The harm of " cadmium poison ", therefore develop and develop popular class of the material of novel environment friendly and excellent electric contact performance as the field
Topic.
Ag-ZnO (AgZnO) contact material has excellent interrupting performance, resistance fusion welding and resistance to arc erosion, and nontoxic
Environmental protection is one of the contact material for substituting Agcdo.The preparation method of silver zinc oxide contact material is roughly divided into powder metallurgy
Method, internal oxidation, chemical coprecipitation and atomization.These methods respectively have deficiency: density of material made of powder metallurgic method is low,
Contact resistance is big, Wen Shenggao；The material surface and internal structure of internal oxidation preparation are uneven, and oxide particle aggregation is serious,
There is poor oxide layer in centre；Chemical coprecipitation technique is more complex, and the problems such as can generate chemical contamination in preparation process.And it is atomized
Method technique has merged the advantages of powder metallurgic method and internal oxidation, is suitble to produce in enormous quantities, have a good application prospect, but mist
Change method also brings some shortcomings while improving Ag-ZnO production efficiency, is such as sintered difficulty, and poor processability etc. is asked
Topic.
The traditional process flow of atomization is substantially are as follows: melting, powder by atomization, alloy powder oxidation, isostatic pressing, burning
Knot, hot extrusion, drawing, are eventually fabricated finished product.Wherein in alloy powder oxidation stage since the thermodynamic stability of ZnO is higher than
Ag2O, therefore the oxidation of Zn is prior to the oxidation of Ag.In powder particle surface segregation occurs for ZnO, hinders in the subsequent sintering process
The contact and diffusion of Ag between powder, leads to that blank sintering is difficult, poor processability.Such as Publication No. CN101202168
Patent of invention, a kind of technique for preparation of novel silver zinc oxide contact material is disclosed, specifically by silver, zinc, additive by certain
Ratio is melted into silver-colored zinc alloy powder by fusing, water mist in mid-frequency melting furnace, is then dried, is aoxidized to atomized alloy powder
Modifier treatment, etc. static pressure, sintering, extruding, wire drawing etc. be processed into silver zinc oxide electrical contact.As previously described, because ZnO under normal pressure
Thermodynamic stability is higher than Ag2O, therefore oxidation of the oxidation prior to Ag of Zn is certainly existed, so as to cause ZnO in powder particle
Segregation occurs for surface, and in the subsequent sintering process between obstruction powder the problem of the contact and diffusion of Ag, therefore same in the invention
There are blank sintering difficulties, the deficiency of poor processability for sample.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of preparation methods of high ductility silver zinc oxide contact material.The party
Method first to wet-milling under the conditions of atmosphere protection of silver-colored zinc alloyed powder, is aoxidized later, is formed, then by molding Ag-ZnO green body
It is placed under specific oxygen pressure, ultra-high temperature condition and is sintered, to obtain the Ag-ZnO ingot blank of even tissue and high ductility, improve silver-colored oxygen
Change the processing performance of Zinc material.
In order to solve the above technical problems, the preparation method of high ductility silver zinc oxide contact material provided by the invention, including
Following steps:
1) material mixture ratio of the Ag-ZnO contact prepared as needed, the dosage of silver needed for calculating, zinc and additive, claims
The silver, zinc and additive of phase the application amount powder by atomization after melting are taken, silver-colored zinc alloyed powder is obtained；
2) silver-colored zinc alloyed powder is placed in ball mill, wet-milling is carried out under the conditions of protective atmosphere, to gained after the completion of wet-milling
Powder is dried, the silver-colored zinc alloyed powder after obtaining ball milling；
3) the silver-colored zinc alloyed powder after ball milling is aoxidized, obtains Ag-ZnO composite powder；
4) Ag-ZnO composite powder is formed, obtains Ag-ZnO green body；
5) gained Ag-ZnO green body is placed in partial pressure of oxygen >=0.8Mpa, temperature is sintered under conditions of being 900~960 DEG C, obtains
To the Ag-ZnO ingot blank of high ductility；
6) gained Ag-ZnO ingot blank obtains Ag-ZnO wire rod or Ag-ZnO band through hot extrusion.
In the step 1) of above-mentioned preparation method, in resulting silver-colored zinc alloyed powder, by mass percentage, shared by additive
Ratio be 0~2%, ratio shared by zinc is 1~20%, and surplus is silver.The selection of the additive is same as the prior art,
It specifically can be the combination selected from one or more of Cu, Bi, Ni, Sb and Te.In the step, stock silver used,
Zinc and additive can be the form of pure metal spindle, be also possible to the form of pure metal powder, if Ag can be pure Ag block,
It can be pure Ag powder.
In the step 2) of above-mentioned preparation method, usually require that wet-milling to partial size≤5 μm of gained powder, preferably requires wet-milling
To partial size≤2 μm of gained powder, further preferred wet-milling to partial size≤1 μm of gained powder.Ball-milling medium in wet-milling,
When Ball-milling Time etc. is the same as those in the prior art ball material quality, it is preferred that ball material mass ratio is 3~10:1, and ball-milling medium is
The mass ratio of dehydrated alcohol, medium and material is 0.5~2:1, and rotational speed of ball-mill is 250~500rmp, and Ball-milling Time is 6~15h.Institute
The protective atmosphere stated is usually N2Or inert gas (such as Ar).The drying of gained powder is usually 80~100 after the completion of wet-milling
DEG C condition carries out, and the time is usually 6~10h.
In the step 3) of above-mentioned preparation method, operation when oxidation is same as the prior art, specifically by the silver after ball milling
Zinc alloy powder is placed in high-pressure oxidation furnace, and 4~8h is aoxidized under the conditions of partial pressure of oxygen is 0.5~2MPa, temperature is 600~800 DEG C.
Resulting material obtains Ag-ZnO composite powder after crushing after oxidation.
In the step 4) of above-mentioned preparation method, existing conventional techniques is used to form to obtain Ag-ZnO composite powder
Ag-ZnO composite powder is usually placed on isostatic pressing machine and forms by Ag-ZnO green body, control isostatic pressure be 50~
200MPa, dwell time are 10s~200s,
In the step 5) of above-mentioned preparation method, the time of sintering is normally controlled in 4~10h.In order to further increase gained
The processing performance of ingot blank, more preferably sintering carry out under conditions of partial pressure of oxygen is 1~2Mpa, temperature is 950~960 DEG C, at this time
The time of sintering is preferably controlled in 6~8h.
In the step 6) of above-mentioned preparation method, the operation of the hot extrusion is same as the prior art, specifically, hot extrusion
Temperature is 830~900 DEG C, and extrusion ratio is 190~270.After obtaining Ag-ZnO wire rod or Ag-ZnO band, by existing
Required Ag-ZnO contact is made in common process.As wire rod or band are carried out multiple drawing (or Rolling compund), annealing again
It is machined to required size, then again with rivet machining (or punching machine punching press) at rivet type (or sheet) contact.
Compared with prior art, present invention is characterized in that
1, molding Ag-ZnO green body is placed in partial pressure of oxygen >=0.8Mpa, temperature is burnt under conditions of being 900~960 DEG C
Knot, be especially sintered under conditions of partial pressure of oxygen is 1~2Mpa, temperature is 950~960 DEG C, using silver point with
The increase of pressure and the characteristics of increase so that in technical solution of the present invention (at normal atmospheric pressure, silver point is greater than 962 DEG C
Silver point be 962 DEG C), therefore ingot blank be not in during super high sintering temperature melting phenomenon (at normal atmospheric pressure, when
The sintering temperature of Ag-ZnO ingot blank will appear melting phenomenon when reaching 960 DEG C, or even just will appear melting at 950 DEG C or more
Phenomenon)；On the other hand, it is sintered under the conditions of superhigh-temperature and-pressure, moreover it is possible to enhance the mutual sintering diffusion between Ag-ZnO particle
It acts on, (according to conventional sintering theory, sintering temperature is sintered closer to the fusing point of substance for the formation of sintering neck between promotion particle
The substance arrived has more superior sintering character), to improve the processing performance of material, and then the Ag-ZnO ingot of high ductility
Base.
2, silver-colored zinc alloy powder obtained will be atomized and is placed in ball mill the progress high energy wet-milling under the conditions of atmosphere protection,
Particle size will not both generate caking phenomenon while obtaining refining broken, and powder particle surface problem of oxidation will not occur,
And particle can generate a large amount of micro-crack during wet-milling, increase the diffusion admittance of oxygen for subsequent oxidation process, so that
Oxygen atom of the grain in subsequent high-voltage high-speed oxidation process is greater than zinc atom out of particle to the diffusion rate inside powder particle
Portion reduces zinc oxide in the enrichment of particle surface, improves the uniformity of material structure toward the diffusion rate on boundary.
3, the method for the invention is simple and easy to control, is suitble to industrialized production.
Detailed description of the invention
Fig. 1 is the picture of step 5) sintering gained Ag-ZnO ingot blank material object in the embodiment of the present invention 1；
Fig. 2 is the picture of step 5) sintering gained Ag-ZnO ingot blank material object in comparative example 1 of the present invention；
Fig. 3 is the picture of step 5) sintering gained Ag-ZnO ingot blank material object in comparative example 2 of the present invention；
Fig. 4 is the resulting Ag-ZnO ingot blank of 1 step 5) of the embodiment of the present invention and the resulting silver oxidation of 2 step 5) of comparative example
Zinc ingot metal base carries out appearance analysis and Metallographic Analysis respectively；Wherein, (a) is the resulting Ag-ZnO ingot of 2 step 5) of comparative example
The fracture apperance of base is (b) metallographic structure of the resulting Ag-ZnO ingot blank of 2 step 5) of comparative example, (c) is 1 step of embodiment
5) fracture apperance of resulting Ag-ZnO ingot blank is (d) the metallographic group of the resulting Ag-ZnO ingot blank of 1 step 5) of embodiment
It knits.
Specific embodiment
The present invention is described in further detail combined with specific embodiments below, content to better understand the invention, but
The present invention is not limited to following embodiments.
Embodiment 1
1) each component is weighed by following mass percents, is placed in medium frequency induction melting furnace that be smelted into uniform alloy molten
Then liquid is atomized through hydraulic atomized equipment, obtained powder slurries are dried, and is crossed 200 meshes, is arrived very much silver-colored zinc alloy
Powder；
Zn:9.5%；
Additive: Bi 0.27%, Cu 0.33%, Ni 0.15%；
Surplus is Ag；
2) silver-colored zinc alloyed powder is placed in high energy ball mill, wet ground is carried out under atmosphere (Ar) protection, until gained
The partial size of powder is 1~5 μm, the powder after wet-milling is placed in baking oven under the conditions of 80 DEG C dry 10h, the silver after obtaining ball milling
Zinc alloy powder；In wet-milling, ball material mass ratio is 3:1, and ball-milling medium is dehydrated alcohol, and the mass ratio of medium and material is 0.5:1,
Rotational speed of ball-mill is 500rmp, Ball-milling Time 15h；
3) the silver-colored zinc alloyed powder after ball milling is placed in high-pressure oxidation furnace, partial pressure of oxygen is 2MPa, temperature is 600 DEG C of conditions
Lower oxidation 8h takes out, is crushed, sieves with 100 mesh sieve, obtain Ag-ZnO composite powder；
4) Ag-ZnO composite powder is placed on isostatic pressing machine and is formed, control isostatic pressure is 50MPa, and the dwell time is
200s obtains Ag-ZnO green body；
5) Ag-ZnO green body is placed in high-pressure oxidation furnace, is burnt under the conditions of partial pressure of oxygen is 0.8MPa, temperature is 960 DEG C
6h is tied, obtains Ag-ZnO ingot blank, material object is as shown in Figure 1, as seen from the figure, being sintered resulting Ag-ZnO surface of ingot blank has had
Metallic luster illustrates that blank sintering densification effect is fine；
6) wire rod is processed into Ag-ZnO ingot blank hot extrusion, wire rod is used after multiple drawing and annealing to the size needed
Rivet is machined to rivet type contact.
Comparative example 1
Embodiment 1 is repeated, unlike:
5) Ag-ZnO green body is placed in high-pressure oxidation furnace, 960 DEG C of sintering 6h is warming up under standard atmosphere condition.
As a result: silver-based has melted in gained ingot blank (since 1 normal atmosphere pressure silver point is 961 DEG C, is sintered at 960 DEG C
Billet is certain to melt, and then can not obtain qualified Ag-ZnO ingot blank), gained ingot blank is in kind as shown in Figure 2.Namely
It says, this example does not obtain the qualified Ag-ZnO ingot blank for subsequent handling.
Comparative example 2
Embodiment 1 is repeated, unlike:
5) Ag-ZnO green body is placed in high-pressure oxidation furnace, 930 DEG C of sintering 6h is warming up under standard atmosphere condition.
As a result: obtain Ag-ZnO ingot blank, it is in kind as shown in figure 3, but gained surface of ingot blank is still dark gray, illustrate at 930 DEG C
It is very undesirable that blank sintering densifies effect.
Embodiment 2
1) each component is weighed by following mass percents, is placed in medium frequency induction melting furnace that be smelted into uniform alloy molten
Then liquid is atomized through hydraulic atomized equipment, obtained powder slurries are dried, and is crossed 200 meshes, is arrived very much silver-colored zinc alloy
Powder；
Zn:8%；
Additive: Cu 0.3%, Ni 0.2%；
Surplus is Ag；
2) silver-colored zinc alloyed powder is placed in high energy ball mill, wet ground is carried out under atmosphere (Ar) protection, until gained
The partial size of powder is 1~2 μm, the powder after wet-milling is placed in baking oven under the conditions of 100 DEG C dry 6h, the silver after obtaining ball milling
Zinc alloy powder；In wet-milling, ball material mass ratio is 10:1, and ball-milling medium is dehydrated alcohol, and the mass ratio of medium and material is 2:1,
Rotational speed of ball-mill is 250rmp, Ball-milling Time 6h；
3) the silver-colored zinc alloyed powder after ball milling is placed in high-pressure oxidation furnace, partial pressure of oxygen is 0.5MPa, temperature is 800 DEG C of items
4h is aoxidized under part, is taken out, is crushed, sieves with 100 mesh sieve, obtain Ag-ZnO composite powder；
4) Ag-ZnO composite powder is placed on isostatic pressing machine and is formed, control isostatic pressure is 100MPa, and the dwell time is
10s obtains Ag-ZnO green body；
5) Ag-ZnO green body is placed in high-pressure oxidation furnace, is sintered under the conditions of partial pressure of oxygen is 2MPa, temperature is 960 DEG C
6h obtains Ag-ZnO ingot blank；
6) plate is processed into Ag-ZnO ingot blank hot extrusion, plate is used after repeatedly being rolled, being annealed to the sizes of needs
Punching machine is processed into blade contact.
Embodiment 3
1) each component is weighed by following mass percents, is placed in medium frequency induction melting furnace that be smelted into uniform alloy molten
Then liquid is atomized through hydraulic atomized equipment, obtained powder slurries are dried, and is crossed 200 meshes, is arrived very much silver-colored zinc alloy
Powder；
Sn:10%；
Additive: Te 1%；
Surplus is Ag；
2) silver-colored zinc alloyed powder is placed in high energy ball mill, wet ground is carried out under atmosphere (Ar) protection, until gained
The partial size of powder is 3~5 μm, the powder after wet-milling is placed in baking oven under the conditions of 90 DEG C dry 9h, the silver after obtaining ball milling
Zinc alloy powder；In wet-milling, ball material mass ratio is 5:1, and ball-milling medium is dehydrated alcohol, and the mass ratio of medium and material is 1:1, ball
Mill revolving speed is 400rmp, Ball-milling Time 10h；
3) the silver-colored zinc alloyed powder after ball milling is placed in high-pressure oxidation furnace, partial pressure of oxygen is 1MPa, temperature is 700 DEG C of conditions
Lower oxidation 7h takes out, is crushed, sieves with 100 mesh sieve, obtain Ag-ZnO composite powder；
4) Ag-ZnO composite powder is placed on isostatic pressing machine and is formed, control isostatic pressure is 80MPa, and the dwell time is
100s obtains Ag-ZnO green body；
5) Ag-ZnO green body is placed in high-pressure oxidation furnace, is sintered under the conditions of partial pressure of oxygen is 1MPa, temperature is 960 DEG C
4h obtains Ag-ZnO ingot blank；
6) wire rod is processed into Ag-ZnO ingot blank hot extrusion, wire rod is used after multiple drawing and annealing to the size needed
Rivet is machined to rivet type contact.
Embodiment 4
1) each component is weighed by following mass percents, is placed in medium frequency induction melting furnace that be smelted into uniform alloy molten
Then liquid is atomized through hydraulic atomized equipment, obtained powder slurries are dried, and is crossed 200 meshes, is arrived very much silver-colored zinc alloy
Powder；
Sn:12%；
Additive: 0%；
Surplus is Ag；
Step 2), 3), 4) with embodiment 3；
5) Ag-ZnO green body is placed in high-pressure oxidation furnace, is sintered under the conditions of partial pressure of oxygen is 1MPa, temperature is 900 DEG C
10h obtains Ag-ZnO ingot blank；
6) wire rod is processed into Ag-ZnO ingot blank hot extrusion, wire rod is used after multiple drawing and annealing to the size needed
Rivet is machined to rivet type contact.
Ag-ZnO ingot blank made from Ag-ZnO ingot blank made from step 5) to Examples 1 to 4 and comparative example 2 respectively
The performances such as bending strength be measured, as a result as described in Table 1:
Table 1:
To the resulting Ag-ZnO ingot blank of 1 step 5) of embodiment and the resulting Ag-ZnO ingot blank of 2 step 5) of comparative example point
Not carry out appearance analysis and Metallographic Analysis, as a result as shown in figure 4, wherein (a) be 2 step 5) of comparative example it is resulting silver oxidation
The fracture apperance of zinc ingot metal base is (b) metallographic structure of the resulting Ag-ZnO ingot blank of 2 step 5) of comparative example, (c) is embodiment 1
The fracture apperance of the resulting Ag-ZnO ingot blank of step 5) is (d) metallographic of the resulting Ag-ZnO ingot blank of 1 step 5) of embodiment
Tissue.As shown in Figure 4, the resulting Ag-ZnO ingot blank of 2 step 5) of comparative example, powder are broken almost without being sintered together
Be entirely it is brittle come along powder particle boundary separation, fracture surface remains the feature of starting powder particle, and
Grain surface is dispersed with a large amount of ZnO particle, and to bulky grain crystal grain (or particle), internal constituent analysis shows internal Zn content
Extremely low, the overwhelming majority has been enriched to powder particle surface.Powder in the resulting Ag-ZnO ingot blank of 1 step 5) of embodiment is
Fully sintered to form fine and close tissue together, the fracture of blank shows as the ductile fracture feature with a large amount of dimples, breaks
Original powder particle almost can not be offered an explanation on face.ZnO particle is not distributed only on crystal boundary, and also a large amount of in the inside of crystal grain
Distribution, this improves the distribution of second phase particles significantly, is beneficial to material processing performance, plasticity and electrical property
It improves.
Claims (7)
1. a kind of preparation method of high ductility silver zinc oxide contact material, comprising the following steps:
1) material mixture ratio of the Ag-ZnO contact prepared as needed, the dosage of silver needed for calculating, zinc and additive, weighs phase
Silver, zinc and the additive of application amount powder by atomization after melting, obtain silver-colored zinc alloyed powder；
2) silver-colored zinc alloyed powder is placed in ball mill, wet-milling is carried out under the conditions of protective atmosphere, to gained powder after the completion of wet-milling
It is dried, the silver-colored zinc alloyed powder after obtaining ball milling；
3) the silver-colored zinc alloyed powder after ball milling is aoxidized, obtains Ag-ZnO composite powder；
4) Ag-ZnO composite powder is formed, obtains Ag-ZnO green body；
5) gained Ag-ZnO green body is placed in partial pressure of oxygen >=0.8Mpa, temperature is sintered under conditions of being 900~960 DEG C, obtains height
The Ag-ZnO ingot blank of ductility；
6) gained Ag-ZnO ingot blank obtains Ag-ZnO wire rod or Ag-ZnO band through hot extrusion.
2. preparation method according to claim 1, it is characterised in that: in step 1), in resulting silver-colored zinc alloyed powder, press
Mass percent meter, ratio shared by additive are 0~2%, and ratio shared by zinc is 1~20%, and surplus is silver.
3. preparation method according to claim 1, it is characterised in that: in step 1), the additive be selected from Cu,
The combination of one or more of Bi, Ni, Sb and Te.
4. preparation method according to claim 1, it is characterised in that: in step 2), wet-milling to partial size≤5 of gained powder
μm。
5. preparation method according to any one of claims 1 to 4, it is characterised in that: in step 5), the time of sintering is 4
~10h.
6. preparation method according to claim 5, it is characterised in that: in step 5), sintering partial pressure of oxygen be 1~2Mpa,
Temperature carries out under conditions of being 950~960 DEG C.
7. preparation method according to claim 6, it is characterised in that: in step 5), the time of sintering is 6~8h.
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| CN110465671A (en) * | 2019-08-08 | 2019-11-19 | 湖南诺尔得材料科技有限公司 | A kind of preparation method of flake silver powder |
| CN112095057A (en) * | 2020-08-08 | 2020-12-18 | 福达合金材料股份有限公司 | Nano silver wire modified silver-nickel electric contact material and preparation method thereof |
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| CN110465671A (en) * | 2019-08-08 | 2019-11-19 | 湖南诺尔得材料科技有限公司 | A kind of preparation method of flake silver powder |
| CN110465671B (en) * | 2019-08-08 | 2022-03-25 | 湖南诺尔得材料科技有限公司 | Preparation method of flaky silver powder |
| CN112095057A (en) * | 2020-08-08 | 2020-12-18 | 福达合金材料股份有限公司 | Nano silver wire modified silver-nickel electric contact material and preparation method thereof |
| CN112095057B (en) * | 2020-08-08 | 2021-09-17 | 福达合金材料股份有限公司 | Nano silver wire modified silver-nickel electric contact material and preparation method thereof |
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| CN115740465A (en) * | 2022-12-13 | 2023-03-07 | 温州中希电工合金有限公司 | Silver tin oxide contact material and preparation method thereof |
| CN115740465B (en) * | 2022-12-13 | 2023-08-18 | 温州中希电工合金有限公司 | Silver tin oxide contact material and preparation method thereof |
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