CN104588672A - Preparation method of in-situ doped copper-bearing tin oxide powder and silver tin oxide material - Google Patents
Preparation method of in-situ doped copper-bearing tin oxide powder and silver tin oxide material Download PDFInfo
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- CN104588672A CN104588672A CN201510014086.8A CN201510014086A CN104588672A CN 104588672 A CN104588672 A CN 104588672A CN 201510014086 A CN201510014086 A CN 201510014086A CN 104588672 A CN104588672 A CN 104588672A
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Abstract
The invention discloses a preparation method of in-situ doped copper-bearing tin oxide powder. The preparation method comprises the following steps of selecting metallic tin with high purity and metallic copper with high purity as raw materials, and smelting two metals into a smelting furnace to form an alloy fused mass with uniform ingredients; carrying out atomizing solidification treatment on the fused mass to obtain tin-copper alloy powder; after drying and size grading, carrying out high-temperature oxidation treatment on the tin-copper alloy powder and transforming the tin-copper alloy powder to an oxide. The powder has the characteristic that the copper is uniformly distributed in the tin oxide powder particles and is suitable for an AgSnO2 material for producing an electrical contact.
Description
Technical field
The invention belongs to alloy smelting field, particularly a kind of preparation method of in-situ doped cupric stannic oxide powder and silver tin oxide material.
Background technology
Siller tin oxide is a kind of important environment-friendly type electrical contact material, industrially has been widely used.But in use, its arc resistant performance is bad for the electrical contact prepared with this material.This material is under the effect of high arc temperature, and easy generation silver is separated with tin oxide, and form the enrichment region of silver or the enrichment region of tin oxide in contact surface, these two kinds of segregations all seriously reduce the service life of electrical contact.When the enrichment region of silver appears in surface, contact melting welding easily occurs and even cannot disconnect, when tin oxide enrichment region appears in surface, contact resistance enlarges markedly, even cannot conducting.In addition, in contact use procedure, because high/low temperature circulation causes thermal stress, also easily cause silver matrix and granules of stannic oxide interface to crack, make contact initial failure.
The main cause of above-mentioned bad phenomenon is that interface energy that is silver-colored and granules of stannic oxide is higher, and in the contact course of work, its interface is easily separated.Therefore, relevant technologies personnel have employed a lot of method to improve the interface wet ability of silver and tin oxide, one of them adds cupric oxide powder exactly in silver tin oxide material, but traditional addition manner is powder mixing method, its most of cupric oxide and tin oxide are in the state being separated from each other instead of coexisting, and effectively can not improve the interface binding characteristic of silver and tin oxide.Even if with the addition of cupric oxide, separating at high temperature and the Interface Cracking of silver and tin oxide still happen occasionally in the course of work of siller tin oxide contact.
Summary of the invention
The cupric oxide existed for existing cupric oxide doped sliver oxidized tin contactor materials and tin oxide major part are separated from each other Problems existing, the present invention proposes a kind of preparation method of in-situ doped cupric stannic oxide powder, in the powder adopting this technology to prepare, copper is evenly distributed in tin powder particle, after oxidation processes, cupric oxide and tin oxide fully coexist, and are namely the composite oxides all containing tin and a small amount of copper in each powder, thus make the character of granules of stannic oxide there occurs change.Adopt the sliver oxidized tin contactor materials of powder preparation of the present invention, effectively can improve the interface wet ability of silver matrix and granules of stannic oxide, because of silver be separated with change tin and occur silver-colored enrichment region and tin oxide enrichment region when greatly reducing use, and the phenomenon of Interface Cracking therebetween, significantly improve the service life of siller tin oxide contact.
Technical solutions according to the invention are:
Cupric stannic oxide powder preparation method, has following steps:
Get metallic tin and metallic copper, melting, obtain the alloy melt of uniform composition, alloy melt adopts the atomization of powder by atomization method to solidify, the gun-metal powder obtained, drying, grading, select the powder of particle diameter≤20 micron, high temperature oxidation process 45-90 hour at 100 ~ 220 DEG C, obtains cupric stannic oxide powder.
In described gun-metal powder, the weight percentage of each component is copper: 1% ~ 10%, and surplus is tin.
The oxide isolation of described high temperature oxidation process is air or oxygen.
Adopt siller tin oxide electric contact material prepared by above-mentioned cupric stannic oxide powder, the weight percentage of its each component is: cupric tin oxide is 5 ~ 20%, and surplus is silver.
Above-mentioned metallic tin and metallic copper are the raw material of purity >=99.9%.
Carry out high temperature oxidation process to this gun-metal powder, oxidation temperature 100 ~ 220 DEG C, oxidizing atmosphere is oxygen or air, makes it change the composite oxide power of cupric and tin into.
In cupric stannic oxide powder of the present invention, cupric oxide and tin oxide fully coexist, and namely all contain the composite oxides of tin and a small amount of copper in each powder, obtain in-situ doped cupric stannic oxide powder.When preparing gun-metal powder by copper content control 1 ~ 10%, if copper content is very little, effectively can not improve last obtained cupric granules of stannic oxide and the interface wet ability of argent; If copper content is too high, easily segregation is produced when adopting melting and atomization to prepare alloy powder, the gun-metal powder obtaining uniform composition can not be ensured, also can reduce the performance of the cupric stannic oxide powder of follow-up preparation and the siller tin oxide electric contact by this powder production.
The present invention selects the signal bronze powder of particle diameter≤20 micron to carry out oxidation processes.If powder diameter is too large, then during oxidation processes, oxygen atom is difficult to be diffused into granular center position, causes the phenomenon that oxidation is not saturating, can not obtain pure cupric stannic oxide powder.
The temperature preparing cupric stannic oxide powder is 100 ~ 220 DEG C.If temperature is too low, then oxygen atom diffusion velocity is slow, powder complete oxidation chronic; If temperature is too high, then easily causes alloy powder to sinter before oxidation and grow up, oxidizing process can not fully be carried out.
Oxidizing process can be carried out in air or oxygen.Use air carries out being oxidized does not need special feeder, easy to operate, but oxidization time is longer; Use oxygen to carry out being oxidized and need special feeder, complicated operation some, but oxidization time is shorter.
Cupric stannic oxide powder of the present invention is suitable for producing siller tin oxide electric contact material.In this electrical contact material, the consumption of cupric stannic oxide powder by weight percentage composition is 5 ~ 20%.If powder consumption is too low, the arc resistant performance of electrical contact effectively can not be improved; If powder consumption is too high, then the contact resistance of electrical contact is too high.
Copper is evenly distributed in stannic oxide powder particle by cupric stannic oxide powder of the present invention, effectively improve the interface wet ability of silver matrix and granules of stannic oxide, because of silver be separated with change tin and occur the phenomenon of silver-colored enrichment region and tin oxide enrichment region when greatly reducing use, and Interface Cracking therebetween, significantly improve the service life of siller tin oxide contact, be suitable for producing used as electric contacts AgSnO
2material.
Detailed description of the invention
Embodiment 1
Get metallic tin and 99.95% metallic copper that purity is 99.95%, gross weight 10kg, wherein copper is 1 kilogram, tin is 9 kilograms, in smelting furnace, be smelted into uniform alloy melt, adopt water atomization to obtain the alloy powder of uniform composition, drying, grading, select the powder of particle diameter≤20 micron, in heat-treatment furnace, condition is temperature 100 DEG C, and atmosphere is that the oxygen of purity 99.9% carries out oxidation processes, time 48h, obtains the stannic oxide powder of cupric.Get this powder 5kg, after the silver powder being 99.95% mixes, obtain through techniques such as cold isostatic compaction, sintering, extruding, drawings the siller tin oxide electric contact material that cupric tin oxide accounts for 5% with 95kg purity.
Embodiment 2-6
Metallic tin and the consumption of metallic copper, the technological parameter (see table 1) of preparation method and employing gained cupric stannic oxide powder prepare the component different (see table 2) of siller tin oxide electric contact material as different from Example 1, and remaining is identical with embodiment 1.
The cupric tin oxide composition (weight percentage) of table 1 embodiment 2-embodiment 6 and technique
| Embodiment | Cu(％) | Sn | Oxidizing temperature (DEG C) | Oxidizing atmosphere | Oxidization time (hour) |
| 2 | 3 | More than | 150 | Air | 72 |
| 3 | 5 | More than | 180 | Oxygen | 48 |
| 4 | 8 | More than | 150 | Air | 72 |
| 5 | 8 | More than | 200 | Oxygen | 60 |
| 6 | 10 | More than | 200 | Air | 84 |
The siller tin oxide electric contact material component (weight percentage) of table 2 embodiment 2-embodiment 6
| Sequence number | Cupric tin oxide (%) | Silver |
| 2 | 5 | More than |
| 3 | 10 | More than |
| 4 | 10 | More than |
| 5 | 15 | More than |
| 6 | 20 | More than |
Claims (5)
1. a cupric stannic oxide powder preparation method, is characterized in that, has following steps:
Get metallic tin and metallic copper, melting, obtain the alloy melt of uniform composition, alloy melt adopts the atomization of powder by atomization method to solidify, the gun-metal powder obtained, drying, grading, high temperature oxidation process 45-90 hour at 100 ~ 220 DEG C, obtains cupric stannic oxide powder.
2. preparation method according to claim 1, is characterized in that, in described gun-metal powder, the weight percentage of each component is copper: 1% ~ 10%, and surplus is tin.
3. preparation method according to claim 1, is characterized in that: the oxide isolation of described high temperature oxidation process is air or oxygen.
4. preparation method according to claim 1, is characterized in that: after grading, selects the powder metallurgy oxidation processes of particle diameter≤20 micron.
5. a siller tin oxide electric contact material, is characterized in that, the weight percentage of each component of this material is: cupric tin oxide according to claim 1 is 5 ~ 20%, and surplus is silver.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104972107A (en) * | 2015-06-27 | 2015-10-14 | 铜陵铜基粉体科技有限公司 | Abrasion-resistant copper-tin alloy powder and method for manufacturing the same |
| CN105033243A (en) * | 2015-06-27 | 2015-11-11 | 铜陵铜基粉体科技有限公司 | Heat-resisting type copper-tin alloy powder and preparing method thereof |
| CN108358235A (en) * | 2018-02-11 | 2018-08-03 | 常熟理工学院 | Adulterate SnO2Dusty material and Ag/ adulterate SnO2The preparation method of electrical contact material |
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| US5766304A (en) * | 1995-04-25 | 1998-06-16 | Kawasaki Steel Corporation | Iron-base powder mixture for powder metallurgy and manufacturing method therefor |
| CN100999789A (en) * | 2006-01-12 | 2007-07-18 | 沈阳金纳新材料有限公司 | Preparation process of silver tin oxide electric contact material |
| CN102268583A (en) * | 2011-08-09 | 2011-12-07 | 福达合金材料股份有限公司 | Method for preparing silver tin oxide electrical contact material |
| CN102312119A (en) * | 2010-06-29 | 2012-01-11 | 福达合金材料股份有限公司 | Preparation method for silver tin oxide electrical contact material |
| CN104269296A (en) * | 2014-09-05 | 2015-01-07 | 重庆川仪自动化股份有限公司 | Preparation method of silver tin oxide electric contact material |
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2015
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5766304A (en) * | 1995-04-25 | 1998-06-16 | Kawasaki Steel Corporation | Iron-base powder mixture for powder metallurgy and manufacturing method therefor |
| CN100999789A (en) * | 2006-01-12 | 2007-07-18 | 沈阳金纳新材料有限公司 | Preparation process of silver tin oxide electric contact material |
| CN102312119A (en) * | 2010-06-29 | 2012-01-11 | 福达合金材料股份有限公司 | Preparation method for silver tin oxide electrical contact material |
| CN102268583A (en) * | 2011-08-09 | 2011-12-07 | 福达合金材料股份有限公司 | Method for preparing silver tin oxide electrical contact material |
| CN104269296A (en) * | 2014-09-05 | 2015-01-07 | 重庆川仪自动化股份有限公司 | Preparation method of silver tin oxide electric contact material |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104972107A (en) * | 2015-06-27 | 2015-10-14 | 铜陵铜基粉体科技有限公司 | Abrasion-resistant copper-tin alloy powder and method for manufacturing the same |
| CN105033243A (en) * | 2015-06-27 | 2015-11-11 | 铜陵铜基粉体科技有限公司 | Heat-resisting type copper-tin alloy powder and preparing method thereof |
| CN108358235A (en) * | 2018-02-11 | 2018-08-03 | 常熟理工学院 | Adulterate SnO2Dusty material and Ag/ adulterate SnO2The preparation method of electrical contact material |
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