Preparing method for silver tin oxide electric contact material based on chemical sedimentation method

An electrical contact material, chemical deposition technology, applied in liquid chemical plating, metal material coating process, coating and other directions, can solve the problems of complex and difficult to control, easy oxide segregation preparation process, etc., to reduce the silver content. The effect of dosage, improving processability and improving wettability

Inactive Publication Date: 2016-12-07
XI'AN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of preparation method of silver tin oxide electrical contact material based on chemical deposition method, utilize chemical deposition method to make uniformly distributed nano-doped silver tin oxide electrical c

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Lanthanum oxide-doped nano-tin oxide powder with an average particle size of 50nm is used;

[0045] Weigh silver nitrate and water respectively according to the mass ratio of 1:99, and mix the weighed silver nitrate and water evenly to obtain a clear silver nitrate solution; take ammonia water, and slowly add ammonia water dropwise to the silver nitrate solution to form Silver ammonia solution, in the dropwise addition process, will utilize the pH meter to control the pH value of solution at 7.5;

[0046] Add lanthanum oxide-doped nano-tin oxide powder to the silver-ammonia solution according to the molar ratio of tin element and silver element as 1:3, and after stirring evenly, a uniformly dispersed suspension system is obtained;

[0047] Slowly add the reducing agent - hydrazine hydrate dropwise into the suspension system, adopt the method of stirring while dropping, use hydrochloric acid to test the silver ions in the suspension during the dropping process, until the...

Embodiment 2

[0050] Copper oxide-doped nano-tin oxide powder with an average particle size of 100nm is used;

[0051]Weigh silver nitrate and water respectively according to the mass ratio of 2:98, and mix the weighed silver nitrate and water evenly to obtain a clear silver nitrate solution; take ammonia water, and slowly add the ammonia water dropwise to the silver nitrate solution to form Silver ammonia solution, in the dropwise addition process, will utilize the pH meter to control the pH value of solution at 8;

[0052] Add copper oxide-doped nano-tin oxide powder to the silver-ammonia solution according to the molar ratio of tin element and silver element as 1:5, and after stirring evenly, a uniformly dispersed suspension system is obtained;

[0053] Slowly add the reducing agent-ascorbic acid into the suspension system, and use the method of stirring while dropping. During the dropping process, use hydrochloric acid to test the silver ions in the suspension until there are no silver ...

Embodiment 3

[0056] Use iron oxide doped nano-tin oxide powder with an average particle size of 70nm;

[0057] Weigh silver nitrate and water respectively according to the mass ratio of 3:97, and mix the weighed silver nitrate and water evenly to obtain a clear silver nitrate solution; take ammonia water, and slowly add ammonia water dropwise to the silver nitrate solution to form Silver ammonia solution, in the dropwise addition process, will utilize the pH meter to control the pH value of the solution at 8.2;

[0058] Add iron oxide-doped nano-tin oxide powder to the silver-ammonia solution according to the molar ratio of tin element and silver element as 1:6, and after stirring evenly, a uniformly dispersed suspension system is obtained;

[0059] Slowly add the reducing agent-formaldehyde into the suspension system, and use the method of stirring while dropping, use hydrochloric acid to test the silver ions in the suspension during the dropping process, until there are no silver ions in...

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Abstract

The invention discloses a preparing method for a silver tin oxide electric contact material based on a chemical sedimentation method. The method specifically comprises the steps that lanthanum oxide or copper oxide or iron oxide or bismuth oxide or cerium oxide serves as an adulterant, nanometer doped tin oxide powder is combined, and doped nanometer tin oxide powder is prepared through a high-energy ball milling or hydro-thermal synthesis or gel method; secondly, a silver nitrate solution and ammonium hydroxide are utilized for preparing a silver-ammonia solution; thirdly, the doped nanometer tin oxide powder prepared in the first step and the silver-ammonia solution formed in the second step are uniformly mixed, and nanometer doped silver tin oxide composite powder is prepared through a reducing agent and through combination of the chemical sedimentation method; and fourthly, the nanometer doped silver tin oxide composite powder obtained in the third step is sequentially subjected to forming treatment and sintering treatment, and the silver tin oxide electric contact material is obtained. The preparing method for the silver tin oxide electric contact material solves the problems that in the existing electric contact material preparing process, the production cycle is long, oxide is prone to segregation, and the technology is complex.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation methods, and in particular relates to a method for preparing silver tin oxide electrical contact materials based on a chemical deposition method. Background technique [0002] Currently, the known silver tin oxide (AgSnO 2 ) In the preparation process of electrical contact materials, different additives and preparation methods are used. Some use high-purity metal atomization combined with oxidation technology to prepare oxide powder, and some use chemical co-precipitation process to simultaneously precipitate silver and oxide powder. , and some use oxide particles and other silver powders in a ball mill for a long time in a ball mill. However, most of the process methods have the disadvantages of high silver content, high cost, strict process requirements, and easy agglomeration of oxide powders, and impurities are easily introduced at high temperatures, which ultimately af...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C5/06C22C32/00C23C18/44
CPCC22C1/05C22C5/06C22C32/0021C23C18/1639C23C18/1646C23C18/44
Inventor 刘松涛王俊勃侯海云杨敏鸽贺辛亥付翀徐洁苏晓磊曹风李笑然
Owner XI'AN POLYTECHNIC UNIVERSITY
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