CN1539727A - Method for preparing compound power of Nano crystal for metal package - Google Patents
Method for preparing compound power of Nano crystal for metal package Download PDFInfo
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- CN1539727A CN1539727A CNA031166431A CN03116643A CN1539727A CN 1539727 A CN1539727 A CN 1539727A CN A031166431 A CNA031166431 A CN A031166431A CN 03116643 A CN03116643 A CN 03116643A CN 1539727 A CN1539727 A CN 1539727A
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Abstract
A composite nanocrystal-in-metal powder is prepared through preparing nanocrystals of additive powder (Ni powder, tin oxide powder, tungsten carbide powder or graphite powder), coating silver layer on the surface of said nanocrystal, and atomic diffusing. It can be used to prepare the electric contact material with high performance (density, hardness, resistivity and electric conductivity).
Description
Technical field
The present invention relates to the preparation method of the nanocrystalline composite powder of a kind of metal bag, belong to contact material
Technical field.
Background technology
Flourish along with new industry, the contact material in car electrics, communication, the instrument control system is progressively improving the localization rate of parts and components.
Contact material powder metallurgical technique method is commonly considered as feasible.Large usage quantity is Agcdo in the contact material, but this kind material produces a kind of cadmium poison in manufacturing processed, environment is had pollution and human body harmful, and it is in anti-melting welding in addition, and aspects such as the deterioration of anti-electric arc are difficult to satisfy electrical equipment at harsh performance requriementss such as miniaturization, high reliability, long lifetives.In addition, there are the problems referred to above equally in other contact materials.
Studies show that, solve the problems referred to above such as additive such as Cadmium oxide powder, putty powder, nickel powder, tungsten carbide powder, Graphite Powder 99, set about from flouring technology, it is more appropriate seeking redress.
Adopting nanotechnology to make metal powder, be used for making various contact materials, is material manufactory and the investigation of materials unit problem of carrying out in recent years, improves the over-all properties of contact material with this.
Here relate to the metal of two or more mutual not solid solution and the powder preparing problem of metal oxide.
A kind of method is that metal powder and additive powder are obtained by mechanically mixing, as the AMI DADUCO of u s company, the metal mixed powder that the said firm adopts mechanically mixing to obtain is discrete shape and distributes, from between the metallographic particle being mechanical bond, the material property that the metal powder of this method preparation is difficult to obtain.
Another kind method is by the reduce deposition method metal to be become composite powder with additive preparation.Disclosed as state university of U.S. Jew (C.Chang et J.Matenials Sei, 28 (1993) 5207-5210), the Chinese Zhang Jiachun of the National University of Defense technology etc. are at the article of " electrical alloy " NO.1 (2000) P 15-20 publication.The metal and the additive composite powder that adopt this method to obtain prepare the metal mixed powder though be better than mechanical mixing, and particle is still thicker, and its over-all properties of the material of making is still not high.
Summary of the invention
The purpose of this invention is to provide a kind of employing nanotechnology and coating method, it is thick to solve the additive powder particles, and the atom of particle surface and being of metal ion bond are closed, and makes its surface evenly cover layer of metal silver, thereby additive particles is evenly distributed.
For achieving the above object, solution of the present invention is: adopt nanotechnology, at first be prepared into the additive powder nanocrystalline, then in additive powder particles surface coverage layer of metal, the atom on additive particles surface is chemical bond with metal ion and combines, by composite powder being given processing according to the atomic diffusion mode, just obtain to be between particle the nanocrystalline composite granules of multiple silver oxide such as metallic bond bonded silver bag stannic oxide, the over-all properties of the material that this composite powder is made is better than the multiple materials such as stannic oxide of method for distinguishing preparation.
Effect of the present invention: adopt nanotechnology and coating method to obtain composite granule, obviously improve the plasticity of material, the resistivity of material reduces by 10～20%, improves Drawing abillity and electric property greatly, and tangible economic benefit is arranged.
Description of drawings
Fig. 1 is the nanocrystalline composite powder preparation method of a metal bag of the present invention schema.
Embodiment
The invention will be further described below in conjunction with accompanying drawing and a preferred embodiment.
With reference to Fig. 1, this is the nanocrystalline composite powder preparation flow of additive powder figure, and as we know from the figure, additive can be a nickel powder, also can be putty powder, tungsten carbide powder, Graphite Powder 99 etc. through high-energy ball milling, obtain aforesaid nanocrystalline; Before its powder is coated, earlier argent is dissolved in nitric acid and become silver nitrate solution, carry out complexing with ammoniacal liquor and handle, when starting stirrer, the reductive agent hydrazine hydrate is splashed into the solution that is stirring by kapillary, simultaneously its powder is sprinkled in the container, use washed with de-ionized water, till the PH 7 of drainage water, wet-milling carries out temperature in baking oven be that 160 ℃ oven dry is handled, through drying the powder fragmentation of handling and sieving, under 300～350 ℃ of temperature, carry out DIFFUSION TREATMENT.
Described above-mentioned nanocrystalline granularity is about 13nm.
Described nanocrystalline coating to above-mentioned powder is to use the no current metal deposition, can obtain even metal level with this method.
When silver nitrate solution and ammoniacal liquor complexing, produce ligand NH3 and silver ions and divide second order reaction.
When described silver nitrate solution and ammoniacal liquor complexing, also reductive agent is splashed into, simultaneously putty powder is sprinkled into.
It is 160 ℃ in the baking oven for heating treatment temp that described silver covers the stannum oxide nano-crystal composite powder, and oven dry is after fragmentation is sieved, and the DIFFUSION TREATMENT temperature is 300 ℃～350 ℃.
Below be illustrated theoretically with regard to the principle of said process.
Nanoparticle is by number few atom or molecular former subgroup or molecular group, particulate has shell structure, very big proportion is occupied on its surface, so nano material is actual is the long-range order arrangement of atom in the crystal grain and the combination of unordered Interface composition, and nano material has a large amount of interfaces crystal boundary atom and reaches 15～50%.These special constructions make nano material have unique volume effect, surface effects, quantum size effect, macro quanta tunnel effect, thereby make it have unusual mechanics, electricity, magnetics, calorifics, optics, superconductivity or the like characteristic.
One of characteristics of Nano metal powder are that fusing point reduces, and nano-silver powder just begins to dissolve greater than 100 ℃ the time.Utilize this point, can under cold condition, the metal sintering that generally can not melt mutually be become special alloy.Nano metal is behind sintering, and the size of metal or alloy crystal grain because difference is heated or sintering condition and different, not necessarily also keeps the size of nano level powder certainly.
Used electrical contact material in the electrical equipment, to high resistance fusion welding in the electric property, wear resistance is clearer and more definite.Nanotechnology just shows high economic benefit on electrical contact material is made.
Claims (5)
1, the preparation method of the nanocrystalline composite powder of a kind of metal bag is characterized in that, comprises the steps:
Elder generation makes additive metal oxide powder nanocrystalline, then the metal oxide powder is coated;
Mechanical alloying is adopted in the preparation of described metal oxide powder, makes nanocrystalline with high-energy mills ball milling metal powder;
Described stannic oxide is coated is: earlier argent is dissolved in nitric acid, become silver nitrate solution, carry out complexing with ammoniacal liquor and handle, when starting stirrer, also the reductive agent hydrazine hydrate is splashed into the silver nitrate solution that is stirring by kapillary, be sprinkled into the metal oxide powder in the container this moment, use washed with de-ionized water again, till the PH=7 of drainage water, the oven dry of then wet-milling being heated in baking oven is handled, after powder fragmentation after will drying is again sieved, carry out DIFFUSION TREATMENT again.
2, the preparation method of the nanocrystalline composite powder of metal bag as claimed in claim 1 is characterized in that:
The nanocrystalline granularity of described metal powder is about 13nm.
3, the nanocrystalline composite powder preparation method of metal bag as claimed in claim 1 is characterized in that:
Described coating to the metal oxide powder is to use the no current metal deposition, can obtain even metal cover with this method;
When silver nitrate solution and ammoniacal liquor complexing, produce ligand NH3 and silver ions and divide second order reaction;
When described silver nitrate solution and ammoniacal liquor complexing, also reductive agent is splashed into, simultaneously the metal oxide powder is sprinkled into.
4, the nanocrystalline composite powder preparation method of metal bag as claimed in claim 1 is characterized in that:
It is 160 ℃ in the baking oven for heating treatment temp that described silver covers the nanocrystalline composite powder wet-milling of metal oxide, and oven dry is after fragmentation is sieved, and the DIFFUSION TREATMENT temperature is 300 ℃～400 ℃.
5, the nanocrystalline composite powder preparation method of metal bag as claimed in claim 1 is characterized in that:
The heat oven dry of described wet-milling in baking oven handled, and its temperature limit fixes on 110 ℃～160 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031166431A CN1539727A (en) | 2003-04-25 | 2003-04-25 | Method for preparing compound power of Nano crystal for metal package |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031166431A CN1539727A (en) | 2003-04-25 | 2003-04-25 | Method for preparing compound power of Nano crystal for metal package |
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| Publication Number | Publication Date |
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| CN1539727A true CN1539727A (en) | 2004-10-27 |
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| CNA031166431A Withdrawn CN1539727A (en) | 2003-04-25 | 2003-04-25 | Method for preparing compound power of Nano crystal for metal package |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101054483B (en) * | 2007-05-23 | 2011-06-29 | 华侨大学 | Silvering graphite and preparation method thereof |
| CN102633499A (en) * | 2012-04-28 | 2012-08-15 | 东莞市中一合金科技有限公司 | Preparation method of silver tin oxide or silver tin oxide and indium oxide material |
| CN110576192A (en) * | 2019-10-22 | 2019-12-17 | 三菱电机(中国)有限公司 | Preparation method of tin oxide electric contact material based on improved silver nickel |
| CN110802224A (en) * | 2018-08-06 | 2020-02-18 | 三菱电机株式会社 | Preparation method of silver-nickel-tin oxide composite powder and silver-nickel-tin oxide electrical contact material |
-
2003
- 2003-04-25 CN CNA031166431A patent/CN1539727A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101054483B (en) * | 2007-05-23 | 2011-06-29 | 华侨大学 | Silvering graphite and preparation method thereof |
| CN102633499A (en) * | 2012-04-28 | 2012-08-15 | 东莞市中一合金科技有限公司 | Preparation method of silver tin oxide or silver tin oxide and indium oxide material |
| CN110802224A (en) * | 2018-08-06 | 2020-02-18 | 三菱电机株式会社 | Preparation method of silver-nickel-tin oxide composite powder and silver-nickel-tin oxide electrical contact material |
| CN110576192A (en) * | 2019-10-22 | 2019-12-17 | 三菱电机(中国)有限公司 | Preparation method of tin oxide electric contact material based on improved silver nickel |
| CN110576192B (en) * | 2019-10-22 | 2022-07-12 | 三菱电机(中国)有限公司 | Preparation method of tin oxide electric contact material based on improved silver nickel |
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