CN104269296B - Preparation method of silver tin oxide electric contact material - Google Patents
Preparation method of silver tin oxide electric contact material Download PDFInfo
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- CN104269296B CN104269296B CN201410450512.8A CN201410450512A CN104269296B CN 104269296 B CN104269296 B CN 104269296B CN 201410450512 A CN201410450512 A CN 201410450512A CN 104269296 B CN104269296 B CN 104269296B
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- oxide
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- 239000000463 material Substances 0.000 title claims abstract description 65
- IVQODXYTQYNJFI-UHFFFAOYSA-N oxotin;silver Chemical compound [Ag].[Sn]=O IVQODXYTQYNJFI-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 239000000843 powder Substances 0.000 claims abstract description 78
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 claims abstract description 37
- 229910001887 tin oxide Inorganic materials 0.000 claims abstract description 31
- 238000003825 pressing Methods 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 27
- 238000005245 sintering Methods 0.000 claims abstract description 19
- 239000000203 mixture Substances 0.000 claims abstract description 12
- 239000000654 additive Substances 0.000 claims abstract description 10
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 31
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 claims description 25
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 25
- 238000010438 heat treatment Methods 0.000 claims description 23
- 229910052709 silver Inorganic materials 0.000 claims description 20
- 239000004332 silver Substances 0.000 claims description 20
- 239000005751 Copper oxide Substances 0.000 claims description 17
- 229910000431 copper oxide Inorganic materials 0.000 claims description 17
- 238000000889 atomisation Methods 0.000 claims description 13
- 239000011812 mixed powder Substances 0.000 claims description 12
- 229910000416 bismuth oxide Inorganic materials 0.000 claims description 11
- TYIXMATWDRGMPF-UHFFFAOYSA-N dibismuth;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Bi+3].[Bi+3] TYIXMATWDRGMPF-UHFFFAOYSA-N 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 10
- 229910052751 metal Inorganic materials 0.000 claims description 10
- 239000000956 alloy Substances 0.000 claims description 9
- 229910045601 alloy Inorganic materials 0.000 claims description 9
- 238000002844 melting Methods 0.000 claims description 9
- 230000000996 additive effect Effects 0.000 claims description 7
- 230000008018 melting Effects 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 7
- 238000012216 screening Methods 0.000 claims description 7
- 238000001125 extrusion Methods 0.000 claims description 6
- 238000010348 incorporation Methods 0.000 claims description 6
- 239000000470 constituent Substances 0.000 claims description 5
- 230000014759 maintenance of location Effects 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 230000003647 oxidation Effects 0.000 abstract description 20
- 238000007254 oxidation reaction Methods 0.000 abstract description 20
- 238000002156 mixing Methods 0.000 abstract description 9
- 238000009826 distribution Methods 0.000 abstract description 3
- 238000005491 wire drawing Methods 0.000 abstract description 2
- QCEUXSAXTBNJGO-UHFFFAOYSA-N [Ag].[Sn] Chemical compound [Ag].[Sn] QCEUXSAXTBNJGO-UHFFFAOYSA-N 0.000 abstract 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 229960004643 cupric oxide Drugs 0.000 description 20
- 230000000052 comparative effect Effects 0.000 description 18
- 239000000047 product Substances 0.000 description 7
- 239000011159 matrix material Substances 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 5
- 238000001192 hot extrusion Methods 0.000 description 5
- 238000009413 insulation Methods 0.000 description 5
- 238000009692 water atomization Methods 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 238000007873 sieving Methods 0.000 description 4
- 229910052797 bismuth Inorganic materials 0.000 description 3
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 239000008187 granular material Substances 0.000 description 3
- 235000012054 meals Nutrition 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000010891 electric arc Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000005482 strain hardening Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- ASMQPJTXPYCZBL-UHFFFAOYSA-N [O-2].[Cd+2].[Ag+] Chemical compound [O-2].[Cd+2].[Ag+] ASMQPJTXPYCZBL-UHFFFAOYSA-N 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- CXKCTMHTOKXKQT-UHFFFAOYSA-N cadmium oxide Chemical compound [Cd]=O CXKCTMHTOKXKQT-UHFFFAOYSA-N 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000010946 fine silver Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 201000009240 nasopharyngitis Diseases 0.000 description 1
- 230000001473 noxious effect Effects 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
-
- 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
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
-
- 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
- H01H1/0237—Composite material having a noble metal as the basic material and containing oxides
- H01H1/02372—Composite material having a noble metal as the basic material and containing oxides containing as major components one or more oxides of the following elements only: Cd, Sn, Zn, In, Bi, Sb or Te
- H01H1/02376—Composite material having a noble metal as the basic material and containing oxides containing as major components one or more oxides of the following elements only: Cd, Sn, Zn, In, Bi, Sb or Te containing as major component SnO2
Abstract
The invention relates to a preparation method of a silver tin oxide electric contact material. According to the method, atomized silver tin powder is processed through internal oxidation and then is mixed with tin oxide powder and additives, and the mixture is manufactured into the silver tin oxide electric contact material with the needed specifications through working procedures such as sintering, pressing, wiredrawing and the like. Compared with a traditional electric contact material, the silver tin oxide electric contact material prepared with the method has the characteristics of a power internal oxidation and power mixing method, the rigidity and the plasticity of the silver tin oxide material are enhanced, it is guaranteed that the material has good forming performance, the distribution pattern of the tin oxide can also be improved, the frequency of the phenomenon that tin oxide gathers can be reduced, the homogeneity of a structure is improved, the temperature rise of the contact material is reduced, and the service life of the contact material can be prolonged easily.
Description
Technical field
The present invention relates to the opening and closing contact field of low-voltage electrical apparatus, particularly to a kind of preparation of tin-oxygen-silver electric contact material
Method.
Background technology
The silver-based composite material that siller tin oxide is is the second phase with granules of stannic oxide, extensively should currently as contact material
For in low-voltage electrical apparatus, such as relay, catalyst, chopper etc..Compared with general particles reiforced metal-base composition, silver-colored oxygen
Changing the granules of stannic oxide in tin material not only plays the role of to strengthen matrix, and strong influence contact material is made under electric arc
Performance, such as arc resistant, anti-melting welding and anti-material transfer ability etc..With conventional appliance field wide variety of Agcdo material
Material is compared, and silver tin oxide material outstanding advantage is under arcing not producing noxious substance, thus without to human body and environment
Constitute harm, and silver cadmium oxide material then occurs that Aska-Rid. decomposes under high arc temperature, form poisonous cd steam, to human body structure
Become to threaten, pollute environment simultaneously.Silver tin oxide material is due to having excellent anti electric arc corrosion, anti-melting welding and anti-material transitivity
Can, current silver tin oxide material is the material most possibly replacing Agcdo.
However, the stannum oxide in silver tin oxide material is due to having good heat stability, under it bears arcing
Do not decompose, add nonwetting with liquid silver, easily under the stirring of electromagnetic force, be enriched in contact surface, because stannum oxide is not led
Electricity, thus lead to contact resistance increase, have electric current by when lead to temperature rise excessive.Silver tin oxide material another one is asked
Topic is that hardness is high, and plasticity is poor, leads to cold working difficult, easily cracking phenomenon in rivet processing and riveting process.
At present in industrialization, siller tin oxide is prepared representational technique and is had powder mixing method and powder internal oxidation.Powder mixing method is
By argentum powder, putty powder and additive mix homogeneously, then by way of sintering, extruding, produce silk material, subsequently through drawing
Silk, the mode of heat treatment produce into the silk material of the specification of regulation, then are processed by cold pier, process rivet, are supplied to electrical apparatus factory
It is assembled into contact to be used.Although adopting the silver tin oxide material producing in this way there is preferable plasticity, oxidation
, easily the reunion of stannum oxide in stannum skewness in silver matrix, leads to the contact resistance of contact big, temperature rise too high
Phenomenon.Powder internal oxidation is Yin Xi and its additive is melted, afterwards by alloy powder internal oxidition, subsequently through pressure
System, sintering and the operation such as extruding, wire drawing, heat treatment are produced.The silver tin oxide material that powder internal oxidation produces has good
Good tissue distribution, granules of stannic oxide is tiny in silver matrix, uniform, is provided simultaneously with good electrical property.But adopt powder
The hardness of the silver tin oxide material that internal oxidation produces is high, plasticity is poor, is difficult to processing using common cold working, and rivet becomes simultaneously
Type performance is bad, the blocked up phenomenon of silver layer easily, leads to not apply in some relay fields.
Content of the invention
It is an object of the invention to provide a kind of preparation method of tin-oxygen-silver electric contact material, the material biography that the method obtains
System contact material compare, there is powder internal oxidition and powder mixing method, that is, improve silver tin oxide material hardness and
Plasticity, it is ensured that having good processability, can improve the distributional pattern of stannum oxide again, can reduce the gathering of stannum oxide, change
Kind structural homogenity, reduces slider material temperature rise, is conducive to improving the service life of slider material, can be widely applied to low tension
Device field.
Realization the technical scheme is that
The preparation method of tin-oxygen-silver electric contact material, comprises the steps of
1) each constituent mass percentage composition is taken to be: stannum 1.0～3.0%, the metal of balance of silver carries out melting, subsequently carries out
Alloy atomization, its atomizing pressure is 75～100mpa, and atomization post-drying becomes powder, screening, and the granularity of described powder is 15～5 μ
M, becomes closely spherical；
2) powder in step 1) is carried out internal oxidition and form siller tin oxide powder, the technique of its internal oxidition is: 100 DEG C
Under, temperature retention time, in 0.5h～2h, is subsequently rapidly heated to 400 DEG C, temperature retention time 0.5h～3h, then is rapidly heated to 700 DEG C,
Temperature retention time 5h～8h；
3) by step 2) described in siller tin oxide powder sieve, with putty powder and additives mixed, obtain mixed-powder,
The quality proportioning of its each component is: stannum oxide: 8～14%, additive: and 0.1～1%, silver is surplus, and incorporation time is 3h～6h；
4) mixed-powder that step 3) obtains carries out isostatic cool pressing and forms isostatic cool pressing ingot, and the pressure of isostatic cool pressing is 50～
80mpa, the dwell time >=100s；
5) step 4) obtains isostatic cool pressing ingot sintering formation sintered ingot, and sintering temperature is 850 DEG C～920 DEG C, sintering time
For 4h～5h；
6) pressing steps 5) sintered ingot that obtains obtains a base, its extrusion ratio >=1:150；
7) by the silk base in step 6), repeatedly cold drawn or hot-drawn and heat treatment, cold drawn pass deformation is less than 10%, heat
The pass deformation drawing be less than 30%, between passage heat treatment temperature be 550 DEG C～650 DEG C, heat treatment time be 30min～
60min, obtains tin-oxygen-silver electric contact material.
Powder described in step 1) is closely spherical.
Step 2) described in Powder Oxidation during observe Powder Oxidation color change it is desirable to its color even is consistent.
The laser particle size d50 of the putty powder described in step 3) is 2～6 μm.
Additive described in step 3) is copper oxide or/and bismuth oxide.
Advantages of the present invention is:
1) adopt the inventive method it is ensured that a part of stannum oxide passes through internal oxidation process Dispersed precipitate in silver matrix
In, another partial oxidation stannum respectively in silver matrix, that is, is improved the hardness of silver tin oxide material and moulds by way of mixed powder
Property it is ensured that having good processability, the distributional pattern of stannum oxide can be improved again, the gathering of stannum oxide can be reduced, improve
Structural homogenity, reduces slider material temperature rise, is conducive to improving the service life of slider material.
2) present invention passes through to control the silver-colored granularity of glass putty and the granularity of putty powder and pattern it is ensured that the two has well
Mixed performance, is further improved the wettability of stannum oxide and silver matrix simultaneously by additive, and the material structure of formation is equal
Even, there is good electric property.
Specific embodiment
Embodiment 1:
Siller tin oxide 8 copper oxide 0.25 material (agsno2 (8) cuo(0.25)) preparation technology is as follows:
1. take each constituent mass percentage composition to be: stannum 1.0%, the metal of balance of silver carries out melting in intermediate frequency furnace, should
The weight of metal is 30kg, then passes through to carry out alloy atomization in water atomization equipment, wherein atomizing pressure is 75mpa, after atomization
It is dried into silver-colored tin powder, screening, at 13 μm, powder becomes closely spherical to the Task-size Controlling of powder；
2. the silver-colored tin powder in step 1 is carried out powder internal oxidition: the technique of internal oxidition is after 100 DEG C of insulation 1h
Be rapidly heated 400 DEG C of insulation 1h, is then rapidly heated 700 DEG C, is incubated 5h, notes observing powder during Powder Oxidation
The uniformity of oxidation color, prevents local from occurring aoxidizing insufficient phenomenon；
3. by the siller tin oxide powder of powder internal oxidition in step 2, after sieving, with laser particle size d50 in 3 μm of scope oxygen
Change glass putty and cupric oxide powder is mixed in mixed powder machine, described siller tin oxide, stannum oxide, the weight of cupric oxide powder are respectively as follows:
27.905kg, 2.02kg, 0.075kg, incorporation time 4h it is ensured that after the mixing of above-mentioned powder the weight/mass percentage composition of each component be:
Stannum oxide: 8%, copper oxide: 0.25%, silver is surplus；
4. above-mentioned mixed powder is carried out isostatic cool pressing and form isostatic cool pressing ingot, the Stress control of isostatic cool pressing exists
55mpa, dwell time 200s；
5. the isostatic cool pressing ingot in step 4 is sintered forming sintered ingot in atmosphere, and sintering temperature controls at 880 DEG C,
Sintering time is 4h；
6. the sintered ingot in step 5 is extruded, and carries out hot extrusion and forms silk base, the extrusion ratio >=1:150 of silk material, extruding
Become the silk material of 4.5mm specification；
7., by the silk base in step 6, hot-drawn is repeated and heat treatment reaches required specification 1.36mm of finished product, wherein
Hot drawn pass deformation is less than 30%, and between passage, heat treatment temperature controls at 550 DEG C, and passage heat treatment time is 30min.
Embodiment 2:
Siller tin oxide 10 bismuth oxide 0.25 material (agsno2 (10) bi2o3(0.3)) preparation technology is as follows:
1. take each constituent mass percentage composition to be: stannum 2.0%, the metal of balance of silver carries out melting in intermediate frequency furnace, should
The weight of metal is 30kg, then passes through to carry out alloy atomization in water atomization equipment, wherein atomizing pressure is 80mpa, after atomization
It is dried into powder, screening, at 11 μm, powder becomes closely spherical to the Task-size Controlling of powder；
2. the silver-colored tin powder in step 1 is carried out powder internal oxidition: the technique of internal oxidition is after 100 DEG C of insulation 1h
Be rapidly heated 400 DEG C of insulation 1.5h, is then rapidly heated 700 DEG C, is incubated 5.5h, needs strict during Powder Oxidation
The uniformity of Powder Oxidation color, prevents local from occurring aoxidizing insufficient phenomenon；
3. by the siller tin oxide powder of powder internal oxidition in step 2, after sieving, with laser particle size d50 in 3.5 μm of scope
Putty powder and oxidation bismuth meal are mixed in mixed powder machine, described siller tin oxide, stannum oxide, the weight difference of oxidation bismuth meal
For 27.67kg, 2.24kg, 0.09kg, incorporation time 4h it is ensured that after the mixing of above-mentioned powder the weight/mass percentage composition of each component be:
Stannum oxide: 10%, bismuth oxide: 0.3%, silver is surplus；
4. above-mentioned mixed powder is carried out isostatic cool pressing and forms isostatic cool pressing ingot, the pressure of isostatic cool pressing is 65mpa,
Dwell time 250s；
5. the isostatic cool pressing ingot in step 4 is sintered forming sintered ingot in atmosphere, and sintering temperature controls at 900 DEG C,
Sintering time is 4.5h；
6. the sintered ingot in step 5 carries out hot extrusion, forms silk base, the extrusion ratio >=1:150 of silk material, is squeezed into 5.4mm
The silk material of specification；
7., by the silk base in step 6, cold drawn and heat treatment is repeated and reaches required specification 2.36mm of finished product, cold drawn
Pass deformation be less than 10%, between passage heat treatment temperature be 600 DEG C, passage heat treatment time be 30min.
Embodiment 3:
Siller tin oxide 13 bismuth oxide, 0.25 copper oxide 0.25 material (agsno2 (13) bi2o3(0.25) cuo(0.25)) system
Standby technique is as follows:
1. take each constituent mass percentage composition to be: stannum 3.0%, the metal of balance of silver carries out melting in intermediate frequency furnace, this gold
The weight belonging to is 30kg, then passes through to carry out alloy atomization in water atomization equipment, wherein atomizing pressure is 90mpa, is atomized after bake
Dry become powder, screening, the Task-size Controlling of powder at 8 μm, powder become closely spherical；
2. the silver-colored tin powder in step 1 is carried out powder internal oxidition: the technique of internal oxidition is to be incubated 1.5h at 100 DEG C
After be rapidly heated 400 DEG C insulation 2h, be then rapidly heated 700 DEG C, be incubated 7h, need strict powder during Powder Oxidation
The uniformity of last oxidation color, prevents local from occurring aoxidizing insufficient phenomenon；
3. by the siller tin oxide powder of powder internal oxidition in step 2, after sieving, with laser particle size d50 in 4 μm of scope oxygen
Change glass putty and bismuth oxide, cupric oxide powder are mixed in mixed powder machine, described siller tin oxide, stannum oxide, oxidation bismuth meal, copper oxide
The weight of powder is respectively as follows: 27.09kg, 2.76kg, 0.075kg, 0.075kg, incorporation time 4.5h it is ensured that above-mentioned powder mixing after
The weight/mass percentage composition of each component is: stannum oxide: 13%, bismuth oxide: and 0.25%, copper oxide: 0.25%, silver: surplus；
4. the powder of above-mentioned mixed siller tin oxide+copper oxide is carried out isostatic cool pressing and form isostatic cool pressing ingot, cold etc.
The pressure of static pressure is 75mpa, dwell time 300s；
5. the isostatic cool pressing ingot in step 4 is sintered forming sintered ingot in atmosphere, and sintering temperature controls at 920 DEG C,
Sintering time is 5h；
6. the sintered ingot in step 5 carries out hot extrusion, forms silk base, the extruding >=1:150 of silk material, is squeezed into 6.5mm rule
The silk material of lattice；
7th, by the silk base in step 6, cold drawn and heat treatment is repeated and reaches required specification 3.86mm of finished product, cold drawn
Pass deformation be less than 10%, between passage, heat treatment temperature controls at 650 DEG C, and passage heat treatment time controls in 60min.
Prepare comparative example metal:
Comparative example 1 siller tin oxide, 8 copper oxide 0.25 material [agsno2 (8) cuo(0.25)] powder mixing method preparation technology:
1. take 30kg fine silver metal melting in intermediate frequency furnace, then pass through to carry out alloy atomization, wherein in water atomization equipment
Atomizing pressure be 75mpa, atomization post-drying become silver powder, screening, the Task-size Controlling of powder below 15 μm, powder Cheng Jinqiu
Shape；
2., by the silver powder in step 1, after sieving, the putty powder being 3 μm with laser particle size d50 and cupric oxide powder are altogether
30kg is mixed in mixed powder machine, incorporation time 4h it is ensured that after the mixing of above-mentioned powder the weight/mass percentage composition of each component be: oxygen
Change stannum: 8%, copper oxide: 0.25%, silver is surplus, obtains the powder of siller tin oxide+copper oxide；
3. the powder of above-mentioned mixed siller tin oxide+copper oxide is carried out isostatic cool pressing and form isostatic cool pressing ingot, cold etc.
The pressure of static pressure is 55mpa, dwell time 250s；
4. the isostatic cool pressing ingot in step 3 sinters formation sintered ingot in atmosphere, and sintering temperature is 880 DEG C, sintering time
For 3.5h；
5. the sintered ingot in step 4 carries out hot extrusion, forms silk base, the extrusion ratio >=1:150 of silk material, is squeezed into 5.4mm
The silk material of specification；
6., by the silk base in step 6, hot-drawn is repeated and heat treatment reaches required specification 1.36mm of finished product, hot-drawn
Pass deformation be less than 30%, between passage, heat treatment temperature controls at 550 DEG C, passage heat treatment time be 30min.
Comparative example 2 siller tin oxide, 8 copper oxide 0.25 material [agsno2 (8) cuo(0.25)] powder internal oxidition preparation work
Skill:
1. by silver plate, stannum and the common 30kg of three kinds of raw materials of copper, by mass percentage: sn:6.3%, cu:0.2%, ag: surplus
Carry out proportioning, melting in intermediate frequency furnace, then pass through to carry out alloy atomization in water atomization equipment, wherein atomizing pressure is 85mpa,
Atomization post-drying becomes silver-colored gun-metal powder, screening, and below 12 μm, powder becomes closely spherical to the Task-size Controlling of powder；
2. the silver-colored gun-metal powder in step 1 is carried out powder internal oxidition, the technique of internal oxidition aoxidizes 8h at 750 DEG C,
Form siller tin oxide 8 copper oxide 0.25(after internal oxidition and contain siller tin oxide 8%, copper oxide 0.25%, similarly hereinafter) alloy powder；
3. above-mentioned mixed powder is carried out isostatic cool pressing and forms isostatic cool pressing ingot, the pressure of isostatic cool pressing is 60mpa,
Dwell time 250s；
4. the isostatic cool pressing ingot in step 3 is sintered forming sintered ingot in atmosphere, and sintering temperature is 900 DEG C, sintering
Time is 4h；
5. the sintered ingot in step 4 carries out hot extrusion, forms silk base, the extrusion ratio >=1:150 of silk material, is squeezed into 5.4mm
The silk material of specification；
6., by the silk base in step 5, hot-drawn is repeated and heat treatment reaches required specification 1.36mm of finished product, hot-drawn
Pass deformation be less than 30%, between passage, heat treatment temperature controls at 550 DEG C, and passage heat treatment time controls in 30min.
Comparative example 3: the method using comparative example 1 produces siller tin oxide 10 bismuth oxide 0.25 material, and trimmed size is drawn to
2.36mm.
Comparative example 4: the method using comparative example 2 produces siller tin oxide 10 bismuth oxide 0.25 material, and trimmed size is drawn to
2.36mm.
Comparative example 5: the method using comparative example 1 produces siller tin oxide 13 bismuth oxide, 0.25 copper oxide 0.25 material, finished product
Specification is drawn to 3.86mm.
Comparative example 6: the method using comparative example 2 produces siller tin oxide 13 bismuth oxide, 0.25 copper oxide 0.25 material, finished product
Specification is drawn to 3.86mm.
The contrast of correlated performance is as follows:
| Embodiment | Tensile strength (mpa) | Elongation percentage (%) | Hv hardness |
| Embodiment 1 | 255 | 12 | 85 |
| Embodiment 2 | 270 | 8 | 90 |
| Embodiment 3 | 315 | 6 | 98 |
| Comparative example 1 | 230 | 15 | 73 |
| Comparative example 2 | 280 | 5 | 95 |
| Comparative example 3 | 245 | 12 | 78 |
| Comparative example 4 | 295 | 4 | 100 |
| Comparative example 5 | 255 | 8 | 85 |
| Comparative example 6 | 330 | 3 | 105 |
From the point of view of embodiment with the contrast of comparative example, silver tin oxide material that method of the present invention produces both had had good
Good tensile strength and plasticity, hv hardness is also more moderate, and the material of the present invention has good rivet processing characteristics, simultaneously group
Knit distribution relatively good, the demand of various Contacts can be met.
Claims (3)
1. a kind of preparation method of tin-oxygen-silver electric contact material is it is characterised in that comprise the steps of
1) each constituent mass percentage composition is taken to be: stannum 1.0～3.0%, the metal of balance of silver carries out melting, subsequently carries out alloy
Atomization, its atomizing pressure is 75～100mpa, and atomization post-drying becomes powder, screening, and the granularity of described powder is 15～5 μm, becomes
Closely spherical；
2) powder in step 1) is carried out internal oxidition and form siller tin oxide powder, the technique of its internal oxidition is: at 100 DEG C,
Temperature retention time, in 0.5h～2h, is subsequently rapidly heated to 400 DEG C, temperature retention time 0.5h～3h, then is rapidly heated to 700 DEG C, protects
Warm time 5h～8h；
3) by step 2) described in siller tin oxide powder sieve, with putty powder and additives mixed, obtain mixed-powder, it is each
The quality proportioning of component is: stannum oxide: 8～14%, additive: and 0.1～1%, silver is surplus, and incorporation time is 3h～6h；
4) mixed-powder that step 3) obtains carries out isostatic cool pressing and forms isostatic cool pressing ingot, and the pressure of isostatic cool pressing is 50～
80mpa, the dwell time >=100s；
5) step 4) obtains isostatic cool pressing ingot sintering formation sintered ingot, and sintering temperature is 850 DEG C～920 DEG C, and sintering time is 4h
～5h；
6) pressing steps 5) sintered ingot that obtains obtains a base, its extrusion ratio >=1:150；
7) by the silk base in step 6), repeatedly cold drawn or hot-drawn and heat treatment, cold drawn pass deformation is less than 10%, hot drawn
Pass deformation is less than 30%, and between passage, heat treatment temperature is 550 DEG C～650 DEG C, and heat treatment time is 30min～60min, obtains
To tin-oxygen-silver electric contact material.
2. preparation method according to claim 1 it is characterised in that: the laser particle size of the putty powder described in step 3)
D50 is 2～6 μm.
3. preparation method according to claim 1 it is characterised in that: the additive described in step 3) be copper oxide or/and
Bismuth oxide.
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| CN104588672A (en) * | 2015-01-12 | 2015-05-06 | 重庆川仪自动化股份有限公司 | Preparation method of in-situ doped copper-bearing tin oxide powder and silver tin oxide material |
| CN105200262B (en) * | 2015-09-23 | 2017-06-16 | 福达合金材料股份有限公司 | A kind of preparation method of high oxidation Theil indices silver-based sheet electrical contact material |
| CN106158436B (en) * | 2016-07-20 | 2019-04-30 | 永兴金荣材料技术有限公司 | Ag-based electrical contact and its manufacturing method, special equipment, particular manufacturing craft |
| CN106378458A (en) * | 2016-08-29 | 2017-02-08 | 河源富马硬质合金股份有限公司 | Method for preparing hard alloy in vacuum extrusion mode |
| CN106653410B (en) * | 2016-10-14 | 2019-04-19 | 佛山市诺普材料科技有限公司 | A kind of high-performance environment protection type siller tin oxide electric contact material and preparation method thereof |
| CN107598176B (en) * | 2017-08-02 | 2020-06-05 | 福达合金材料股份有限公司 | Preparation process of silver metal oxide electrical contact material |
| CN108149122A (en) * | 2017-12-27 | 2018-06-12 | 洛阳神佳窑业有限公司 | A kind of preparation method of silver-base alloy contact material |
| CN113122745B (en) * | 2021-04-02 | 2022-03-29 | 东北大学 | Preparation method of silver tin oxide composite electric contact material |
| CN113699402A (en) * | 2021-08-25 | 2021-11-26 | 石家庄铁道大学 | Preparation method of silver tin oxide electrical contact material containing copper oxide nano additive |
| CN115709288A (en) * | 2022-11-28 | 2023-02-24 | 桂林金格电工电子材料科技有限公司 | Preparation method of silver tin oxide lanthanum oxide contact material |
| 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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