Process for preparing silver tin oxide material

A technology of silver tin oxide and internal oxidation, applied in the field of preparation of silver tin oxide materials, can solve problems such as unfavorable electrical properties of materials, product size, limitation of tin oxide content, etc., and achieve the effects of improved comprehensive performance, firm bonding and sufficient oxidation.

Inactive Publication Date: 2003-06-25
陈达峰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process is suitable for mass production, but the disadvantage of this process is that during the internal oxidation process, since oxygen atoms need to diffuse in the dense body of the alloy, the gradient distribution of its concentration will cause changes in the microstructure of the material. Tin oxide-poor regions or non-oxidized regions are formed on the surface, and tin oxide is segregated at the grain boundary, which is detrimental to the electrical properties of the material
At the same time, there are certain restrictions on the size and tin oxide content of the product

Method used

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  • Process for preparing silver tin oxide material
  • Process for preparing silver tin oxide material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1: Take 8.9 kg of silver and 1 kg of tin, place them in an intermediate frequency furnace and smelt them into a liquid state, then use high-pressure water atomization equipment to atomize the alloy, and the atomized liquid particles are dried into alloy powders, and after screening, Put the powder with a particle size of 150 mesh to 300 mesh into the internal oxidation furnace for oxidation. During oxidation, the temperature is controlled at 500 ° C, and the oxygen pressure of 0.8 is maintained. After oxidation for 2 hours, it is taken out. After the test meets the requirements, the cold isostatic pressing process is used. The pressure is set to 1800Kg / cm 3 . It is processed into a billet in a special pressure equipment, and then sintered in the equipment at a temperature of 750 ° C for 5 hours, taken out and extruded into wire, and then drawn to obtain the finished product.

Embodiment 2

[0013] Example 2: Take 14 kg of silver and 1.1 kg of tin, place them in an intermediate frequency furnace and smelt them into a liquid state, then use high-pressure water atomization equipment to atomize the alloy, and the atomized particle liquid is dried into alloy powder, and after screening, the Put the powder with a particle size of 150 mesh to 300 mesh into the internal oxidation furnace for oxidation. During oxidation, the temperature is controlled at 700 ° C, and the oxygen pressure of 1.2 is maintained. After oxidation for 2.2 hours, it is taken out. After testing and meeting the requirements, the cold isostatic pressing process is used. The pressure is set to 2500Kg / cm 3 . It is processed into a billet in the special pressure equipment, and then sintered in the equipment at a temperature of 800°C for 6 hours, taken out and extruded into wire, and then drawn to obtain the finished product.

Embodiment 3

[0014] Example 3: Take 12 kg of silver and 1.1 kg of tin, place them in an intermediate frequency furnace and smelt them into a liquid state, then use high-pressure water atomization equipment to atomize the alloy, and the atomized liquid particles are dried into alloy powder, and after screening, Put the powder with a particle size of 150 mesh to 300 mesh into the internal oxidation furnace for oxidation. During oxidation, the temperature is controlled at 800 ° C, and the oxygen pressure of 1.4 is maintained. After 3 hours of oxidation, it is taken out. After testing and meeting the requirements, the cold isostatic pressing process is used. The pressure is set to 2800Kg / cm 3 . It is processed into a billet in the special pressure equipment, and then sintered in the equipment at a temperature of 850 ° C for 6.5 hours, taken out and extruded into wire, and then drawn to obtain the finished product.

[0015] The performance indicators of the finished product made by the present...

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Abstract

The present invention relates to the preparation of contact material and is especially the preparation of silver-tin oxide material. The preparation process includes smelting silver and tin in certain ratio in a medium frequency furnace, alloy atomizing inside one high pressure water atomizing equipment, stoving to obtain powder, sieving, oxidation inside aninternal oxodizing furnace at certain temperature and oxygen pressure, cold hydrostatic processing to obtain ingot, sintering, extruding into wire and drawing into the product. The silver-tin oxide material has full oxidation of tin, firm combination between tin oxide and silver base and high comprehensive performance.

Description

1. Technical field [0001] The invention relates to a method for preparing a contact material, in particular to a method for preparing a silver tin oxide material. 2. Background technology [0002] The performance of the contact material directly affects the reliability and service life of the electrical switch. The ideal contact material should have good physical properties, mechanical properties, chemical properties, electrical contact properties and welding properties. At present, most of the contact materials in the domestic electrical industry use silver cadmium oxide materials, but silver cadmium oxide materials have certain toxicity. With the improvement of people's living standards, people's requirements for the comprehensive performance of electrical appliances are getting higher and higher. Silver tin oxide material is an environmentally friendly composite material that can replace silver cadmium oxide material in a wide range. [0003] Silver tin oxide materials ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C5/06C22C32/00
Inventor 陈达峰雷长明费宝荣童文珍陈国贤
Owner 陈达峰
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