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Preparation method of silver tin oxide electric contact material

An electrical contact material, silver tin oxide technology, used in contacts, circuits, electrical switches, etc., can solve the problems of high hardness of silver tin oxide materials, poor rivet forming performance, and excessively thick silver layer, so as to improve the uniformity of the structure. properties, improve hardness and plasticity, and improve the effect of distribution morphology

Active Publication Date: 2015-01-07
CHONGQING CHUANYI AUTOMATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the silver tin oxide material produced by the powder internal oxidation method has high hardness and poor plasticity, and it is difficult to process by ordinary cold processing. At the same time, the rivet forming performance is not good, and the silver layer is prone to be too thick, which makes it impossible to be used in some relay fields. application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The preparation process of silver tin oxide 8 copper oxide 0.25 material (AgSnO2(8)CuO(0.25)) is as follows:

[0024] 1. The mass percentage content of each component is: tin 1.0%, the balance is silver, and the metal is smelted in the intermediate frequency furnace. The weight of the metal is 30Kg, and then the alloy is atomized through the water atomization equipment, in which The melting pressure is 75MPa, after atomization, it is dried into silver-tin powder, screened, the particle size of the powder is controlled at 13μm, and the powder becomes nearly spherical;

[0025] 2. The silver-tin powder in step 1 is subjected to powder internal oxidation: the process of internal oxidation is to quickly heat up to 400°C for 1 hour after holding at 100°C for 1 hour, then quickly heat up to 700°C and hold for 5 hours. During the powder oxidation process Pay attention to observe the uniformity of powder oxidation color to prevent insufficient oxidation locally;

[0026] 3....

Embodiment 2

[0032] The preparation process of silver tin oxide 10 bismuth oxide 0.25 material (AgSnO2(10)Bi2O3(0.3)) is as follows:

[0033] 1. The mass percentage content of each component is: tin 2.0%, and the metal with the balance of silver is smelted in an intermediate frequency furnace. The atomization pressure is 80MPa, after atomization, it is dried into powder, screened, the particle size of the powder is controlled at 11 μm, and the powder becomes nearly spherical;

[0034] 2. The silver-tin powder in step 1 is subjected to powder internal oxidation: the process of internal oxidation is to rapidly heat up to 400°C for 1.5h after holding at 100°C for 1h, then quickly heat up to 700°C, hold for 5.5h, and then oxidize in the powder In the process, the uniformity of the powder oxidation color needs to be strictly controlled to prevent insufficient oxidation locally;

[0035] 3. With the silver tin oxide powder oxidized in the powder in step 2, after sieving, mix tin oxide powder...

Embodiment 3

[0041] The preparation process of silver tin oxide 13 bismuth oxide 0.25 copper oxide 0.25 material (AgSnO2(13)Bi2O3(0.25)CuO(0.25)) is as follows:

[0042]1. The mass percentage content of each component is: tin 3.0%, and the metal with the balance of silver is smelted in an intermediate frequency furnace. The atomization pressure is 90MPa. After atomization, it is dried into powder and screened. The particle size of the powder is controlled at 8 μm, and the powder becomes nearly spherical;

[0043] 2. The silver-tin powder in step 1 is subjected to powder internal oxidation: the process of internal oxidation is to rapidly heat up to 400°C for 2 hours after holding at 100°C for 1.5h, then quickly heat up to 700°C and hold for 7h. During the powder oxidation process It is necessary to strictly control the uniformity of powder oxidation color in order to prevent insufficient oxidation locally;

[0044] 3. With the silver tin oxide powder oxidized in the powder in step 2, af...

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Abstract

The invention relates to a preparation method of a silver tin oxide electric contact material. According to the method, atomized silver tin powder is processed through internal oxidation and then is mixed with tin oxide powder and additives, and the mixture is manufactured into the silver tin oxide electric contact material with the needed specifications through working procedures such as sintering, pressing, wiredrawing and the like. Compared with a traditional electric contact material, the silver tin oxide electric contact material prepared with the method has the characteristics of a power internal oxidation and power mixing method, the rigidity and the plasticity of the silver tin oxide material are enhanced, it is guaranteed that the material has good forming performance, the distribution pattern of the tin oxide can also be improved, the frequency of the phenomenon that tin oxide gathers can be reduced, the homogeneity of a structure is improved, the temperature rise of the contact material is reduced, and the service life of the contact material can be prolonged easily.

Description

technical field [0001] The invention relates to the field of switching contacts of low-voltage electrical appliances, in particular to a preparation method of a silver tin oxide electrical contact material. Background technique [0002] Silver tin oxide is a silver-based composite material with tin oxide particles as the second phase. It is currently widely used as an electrical contact material in low-voltage electrical appliances, such as relays, contactors, and circuit breakers. Compared with general particle-reinforced metal matrix composites, the tin oxide particles in the silver tin oxide material not only have the effect of strengthening the matrix, but also greatly affect the performance of the electrical contact material under the action of the arc, such as anti-arc, anti-welding and Resistance to material transfer, etc. Compared with the silver cadmium oxide material widely used in the electrical field in the past, the outstanding advantage of the silver tin oxide...

Claims

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Application Information

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IPC IPC(8): H01H11/04H01H1/0237B22F9/08B22F3/16
CPCH01H1/02376H01H11/048B22F1/00B22F1/10
Inventor 章应徐永红刘浩田茂江周晓荣
Owner CHONGQING CHUANYI AUTOMATION
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