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AgSnO contact material and preparation method thereof

A silver tin oxide and contact material technology, applied in cable/conductor manufacturing, metal/alloy conductors, electrical components, etc., can solve problems such as difficulty in preparing materials with high tin oxide content, large investment in internal oxidation equipment, and high-priced imports , to achieve the effect of easy molding, easy composition, and composition control

Active Publication Date: 2013-09-18
CHENZHOU CITY JINGUI SILVER IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The former two are difficult to prepare materials with high tin oxide content due to the dense oxide film formed by tin during the oxidation process, and the investment in internal oxidation equipment is large; the powder mixing method has high requirements for powder raw materials, and the powder mixing equipment needs to be imported at a high price, which touches the domestic market. Head material manufacturers use less

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] This example is to prepare silver tin oxide (9.5 wt%) lanthanum oxide (0.5 wt%) material.

[0018] Step 1: Prepare about 5 kg of tin (94.56 wt%) lanthanum (5.44 wt%) alloy by conventional alloy melting.

[0019] Step 2: Take 5-7.5 kg of concentrated nitric acid with a concentration of about 70%, and mix it with pure water at a volume ratio of 1:1; through the oxidation of this nitric acid, subsequent cleaning (pH value of cleaning water to 7), drying (100-200°C treatment for 10-12 hours), calcining (calcination at 1000-1400°C for 6-10 hours), etc., to prepare about 6 kg of rare earth-containing tin oxide;

[0020] Step 3: Perform ball milling treatment on the tin oxide, stir evenly in pure water; add quantitative complex silver nitrate solution and reducing agent hydrazine solution to prepare silver tin oxide (9.5 wt%) lanthanum oxide (0.5 wt%) composite About 60 kilograms of powder.

[0021] Step 4: The powder is dried (at 100-200°C for 3-5 hours), calcined (at 400-6...

Embodiment 2

[0024] This example is to prepare silver tin oxide (9.3wt%) lanthanum oxide (0.5 wt%) copper oxide (0.2 wt%) material.

[0025] Step 1: Prepare tin (92.55 wt%) lanthanum (5.43 wt%) copper (2.02 wt%) alloy by alloy melting.

[0026] Step 2: Take 5-7.5 kg of concentrated nitric acid with a concentration of about 70%, and mix it with pure water at a volume ratio of 1:1; through the oxidation of this nitric acid, subsequent cleaning (pH value of cleaning water to 7), drying (100-200°C treatment for 10-12 hours), calcining (calcination at 1000-1400°C for 6-10 hours), etc., to prepare about 6 kg of rare earth-containing tin oxide;

[0027] Step 3: Perform ball milling treatment on the tin oxide, stir evenly in pure water; add quantitative complex silver nitrate solution and reducing agent hydrazine solution to prepare silver tin oxide (9.3 wt%) lanthanum oxide (0.5 wt%) oxidation Copper (0.2 wt%) composite powder is about 60 kg.

[0028] Step 4: The powder is dried (at 100-200°C f...

Embodiment 3

[0031] This example is to prepare silver tin oxide (9.5 wt%) lanthanum oxide (0.425 wt%) and cerium oxide (0.25 wt%) materials.

[0032] Step 1: Prepare about 5 kg of tin (94.62 wt%) lanthanum (2.69 wt%) cerium (2.69 wt%) alloy by alloy melting.

[0033] Step 2: Take 5-7.5 kg of concentrated nitric acid with a concentration of about 70%, and mix it with pure water at a volume ratio of 1:1; through the oxidation of this nitric acid, subsequent cleaning (pH value of cleaning water to 7), drying (100-200°C treatment for 10-12 hours), calcining (calcination at 1000-1400°C for 6-10 hours), etc., to prepare about 6 kg of rare earth-containing tin oxide;

[0034] Step 3: Perform ball milling treatment on the tin oxide, stir in pure water evenly; add quantitative complexed silver nitrate solution and reducing agent hydrazine solution to prepare silver tin oxide (9.5 wt%) lanthanum oxide (0.425 wt%) oxidation About 60 kg of cerium (0.25wt%) composite powder.

[0035] Step 4: The powd...

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PUM

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Abstract

The invention relates to an AgSnO contact material and a preparation method thereof, belonging to the technical field of electric materials. The AgSnO contact material is composed of Ag and rare-earth-containing stannic oxide. The content of the rare-earth-containing stannic oxide is 1-20wt%. The rare-earth-containing stannic oxide can be a mixture of Ag and rare earth and also can be a mixture of Ag, the rare earth and a third component, wherein the rare earth can be single rare earth or mixed rare earth; the third component is one or more than one of copper, bismuth, antimony and indium; and the content of the third component is not higher than the content of the rare earth. The content of the rare earth in the stannic oxide is not more than 10%. The invention adopts a composite powder process, namely stannic oxide prepared in advance is taken as a core, and silver ion in silver nitrate is reduced, thus silver is deposited on the surface of stannic oxide particle, and uniform AgSnO composite powder is formed; and subsequent moulding, sintering, extrusion processing and the like are carried out, thus a wire rod or piece contact product which can meet customer requirements is prepared. The AgSnO contact material provided by the invention is easy to be subjected to moulding, sintering and extrusion processing, and a contact material product with high performance can be produced.

Description

technical field [0001] The invention relates to a preparation method of an electrical contact material, in particular to a silver tin oxide contact material and a preparation method thereof, belonging to the technical field of electrical materials. Background technique [0002] In recent years, with the promotion of EU RoHS 2002 / 95 / EC and WEEE 2002 / 95 / EC on banned substances in electrical and electronic equipment, as the main substitute for cadmium-containing silver contact materials, the development and application of silver tin oxide contact materials The application has been growing day by day, and it has become a symbolic product of silver-based contact materials used in the field of medium and low voltage electrical appliances. [0003] At present, the typical production processes of silver tin oxide materials mainly include alloy internal oxidation method, powder pre-oxidation method, powder mixing method and composite powder method. The former two are difficult to pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B1/02H01B13/00
Inventor 杨跃新王强许军曹政倪泽胜
Owner CHENZHOU CITY JINGUI SILVER IND CO LTD
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