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Silver-nanotin oxide electric contact material and its preparing process

A technology of nano-tin oxide and electrical contact materials, applied in metal material coating technology, contact materials, liquid chemical plating, etc., can solve the problem of difficult to obtain silver-tin oxide composite powder, powder sticky balls and powder pollution , Difficulty in mass production and other issues, to achieve the effects of easy implementation, improved wettability, and improved processability

Active Publication Date: 2007-11-14
桂林金格电工电子材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the process method introduced by this patent is: solid nano SnO 2 Due to the particularly developed surface energy of powder particles, it is easy to agglomerate into micron particles. During the powder mixing process, nano-SnO 2 It is difficult to completely disperse the particles, so it is not easy to obtain nano-SnO 2 Microstructure with dispersed and evenly distributed particles in the Ag matrix
Its disadvantages are: too high ball-to-material ratio (10-100:1) during high-energy ball milling is likely to cause powder sticking to balls and powder pollution, and it is not easy to realize mass production
The disadvantage of this method is that the solid nanocrystalline SnO after ball milling 2 Powder particles are easy to agglomerate due to the particularly developed surface energy, and it is difficult to obtain nano-SnO 2 Silver-tin oxide composite powder whose particles are uniformly dispersed in the silver matrix

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] ① Take SnCl 4 .5H 2 O crystallizes 4.65kg, dissolved in deionized water to prepare a solution with a concentration of 5%; take C 6 H 8 O 7 .H 2 O crystal 232g, dissolved in deionized water with conductivity less than 20μS / cm to form a solution with a concentration of 5%; the two solutions are evenly mixed, and NH with a concentration of 7% is added successively 3 .H 2 O solution is stirred, and the precipitation reaction is carried out at a temperature of 30~50℃, until the pH of the solution is 9; the precipitate is washed with deionized water, filtered and concentrated to obtain Sn(OH) with 5% solid content 4 Hydrosol.

[0026] ②Weigh 7.983kg pure Ag powder and 13.3g pure Cu powder respectively, and add 30% HNO 3 Dissolve completely, add deionized water to dilute to AgNO after filtration 3 8% concentration mixed solution, then add 20% NH concentration 3 .H 2 O, stir evenly until the pH value of the reaction solution reaches 11. Add the Sn(OH) obtained in step ① above 4 Hyd...

Embodiment 2

[0031] ① Take SnCl 4 .5H 2 O crystallizes 4.65kg, dissolved in deionized water to prepare a 7% solution; C 6 H 8 O 7 .H 2 155 g of O crystals are dissolved in deionized water to form a 7% solution; the two solutions are evenly mixed, and 9% NH is added successively 3 .H 2 O solution is stirred, and the precipitation reaction is carried out at a temperature of 30~50℃, until the pH of the solution is 9; the precipitate is washed with deionized water, filtered and concentrated to obtain Sn(OH) with a solid content of 8% 4 Hydrosol.

[0032] ②Weigh 2.9kg of pure Ag powder and 80g of pure Cu powder with 38% HNO 3 Dissolve completely, add deionized water to dilute to AgNO after filtration 3 10% concentration of mixed solution, then add 23% NH 3 .H 2 O, stir evenly until the pH value of the reaction solution reaches 11. Add the Sn(OH) obtained in step ① above 4 Hydrosol, stir evenly; add 0.82 liters of 75% N 2 H 4 .H 2 The O solution is sprayed into the reaction tank and stirred vigorous...

Embodiment 3

[0037] ① Take SnCl 4 .5H 2 O crystallizes 4.65kg, which is dissolved in deionized water to prepare a solution with a concentration of 10%; C 6 H 8 O 7 .H 2 186 g of O crystals are dissolved in deionized water to prepare a solution with a concentration of 10%; the two solutions are evenly mixed, and NH with a concentration of 10% is added successively 3 .H 2 O solution was stirred and the precipitation reaction was carried out at a temperature of 30~50℃, until the pH of the solution was 9; the precipitate was washed with deionized water, filtered and concentrated to obtain Sn(OH) with a solid content of 10% 4 Hydrosol.

[0038] ②Weigh 4.42kg of pure Ag powder and 200g of pure Cu powder with 40% HNO 3 Dissolve completely, add deionized water to dilute to AgNO after filtration 3 12% concentration mixed solution, then add 25% NH concentration 3 .H 2 O, stir evenly until the pH value of the reaction solution reaches 11. Add the Sn(OH) obtained in step ① above 4 Hydrosol, stir evenly; a...

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Abstract

This invention disclose silver - nanometer tin oxide contact material and their, and preparation of the electrical contact materials SnO2 the weight percentage of 8 to 12 percent, with an average particle size of less than 100 nanometers, but also a 0.1 to 1% CuO, MS volume Ag. Preparation of its major include: stannic chloride and citric acid solution was prepared by adding ammonia Sn (OH) 4 hydrosol; Ag powder dissolved by adding ammonia from AgNO3 solution after mixing uniform joined Sn (OH) 4 hydrosol, sprayed the hydrazine hydrate reaction after cleansing, concentration, drying in the Ag-Sn (OH) 4-coated powder; coated milling and baking powder, as treatment with Ag powder mixture and processing; in the Ag-nanometer SnO2 powder processed by a conventional process, Contact Materials. Silver Powder used by the copper powder can be added to the Ag-Cu-Sn (OH) 4-coated powder. This process Sn (OH) 4 Sol a good dispersion, coated Ag, calcined SnO2 particles dispersed in the matrix of Ag, income, life expectancy and electrical contact materials tensile strength, hardness has risen markedly, and the stability and processing sexual better.

Description

(1) Technical field [0001] The invention relates to a silver-based electrical contact material in the field of electrical alloy materials, in particular to a silver-nano tin oxide electrical contact material and a preparation process thereof. (2) Background technology [0002] The electrical contact material is the core component of the switching device, which is responsible for the task of connecting, carrying and breaking normal current and fault current. Silver-metal oxide composite materials are widely used electrical contact materials in low-voltage electrical appliances such as relays, contactors, and low-voltage circuit breakers. Among them, silver-cadmium oxide (Ag-CdO) is used the most, but because cadmium is harmful to humans , Europe has issued the RoHS directive, which requires that electronic and electrical equipment put on the market on July 1, 2006 do not contain six hazardous substances such as lead, mercury, cadmium, hexavalent chromium, polybrominated diphenyl e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H1/02H01B1/02C22C5/06C22C1/10C22C1/04C23C18/31C23C18/42B22F9/00
Inventor 黄锡文陈光明崔建华
Owner 桂林金格电工电子材料科技有限公司
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