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Preparation method of modified AgSnO2 electric contact material

An electrical contact material and modification technology, applied in the field of material metallurgy, can solve problems such as temperature rise of silver tin oxide materials, wettability stratification, and excessive temperature rise of materials, so as to achieve easy control of the process flow and improvement of comprehensive performance , The effect of simple raw material preparation

Inactive Publication Date: 2010-02-17
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, some problems still exist, such as poor plasticity of the material, which is difficult to process; the temperature of the silver tin oxide material rises, and the tin oxide cannot decompose, resulting in a worse arc extinguishing effect than silver cadmium oxide; the difference in wettability between tin oxide and silver causes delamination, etc.
The patents "Preparation of Silver-Tin Dioxide by Synthesis Method" (Application No.: 99104491.6) and "Technology for Preparation of Silver Rare Earth Oxide Electrical Contact Materials" (Application No.: 02113216.X) filed by the inventor propose a synthesis technology through reaction The method for preparing silver metal oxide (tin oxide, rare earth oxide) electrical contact materials improves the performance of silver tin oxide to a certain extent, but still needs to be improved in terms of excessive temperature rise of the material

Method used

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  • Preparation method of modified AgSnO2 electric contact material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] By 10% tin oxide powder (weight percent), 89.5% silver powder (weight percent), 0.4% sodium carbonate powder (weight percent), 0.1% copper powder (weight percent), powder is inserted into the ball mill of corundum material Vacuum the tank, fill it with argon, and carry out mechanical alloying under the protective atmosphere of argon. The rotation speed of the planetary high-energy ball mill is 800rad / min. After 6 hours of mixing in the planetary ball mill, it is bidirectionally pressed in a steel mold to form a green body. The green body is formed at a pressure of 650MPa; the green body is sintered at 800°C for 4 hours to become an ingot ; The ingot is repressed with a pressure of 500MPa, refired at 700°C for 10 hours, then extruded into a wire rod at a temperature of 600°C, and finally cold drawn into a wire (wire) material.

Embodiment 2

[0023] By 7% tin powder (weight percentage), 74% silver powder (weight percentage), 18.5% silver oxide is raw material, 0.4% potassium carbonate powder (weight percentage), and adds 0.1% tungsten powder (weight percentage) , put the powder into a corundum ball mill jar, vacuumize it, fill it with argon, and carry out mechanical alloying under the protective atmosphere of argon. The planetary high-energy ball mill rotates at 600rad / min. After 10 hours of mixing in the planetary ball mill, it is bidirectionally pressed in a steel mold to form a green body. The green body forming pressure is 650MPa; the green body is sintered at 800°C for 4 hours to become an ingot. ; The ingot is repressed with a pressure of 500MPa, refired at 700°C for 8 hours, then extruded into a wire rod at a temperature of 600°C, and finally cold drawn into a wire (wire) material.

Embodiment 3

[0025]By silver-tin alloy powder 52% (wherein the weight percent content of tin is 24% of silver-tin alloy powder), silver oxide powder 46.88%, 1.0% potassium carbonate powder (weight percent), and add 0.08%W (tungsten), 0.04% Mo (molybdenum) (percentage by weight), put the powder into a corundum ball mill jar, vacuumize, fill with argon, and perform mechanical alloying under an argon protective atmosphere. Planetary high-energy ball mill rotates at 500rad / min. After 9 hours of mixing in the planetary ball mill, it is bidirectionally pressed in a steel mold to form a green body. The green body forming pressure is 500MPa; and it is further formed into a green body by cold isostatic pressing. The blank forming pressure is 300MPa; the blank is sintered at 760°C for 7 hours to become an ingot, the ingot is repressed at 500MPa, refired at 800°C for 3 hours, extruded at 550°C to form a wire rod, and finally cold drawn into a wire (wire) material.

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Abstract

The invention relates to a preparation method of a modified AgSnO2 electric contact material, in particular to a preparation method of a carbonate modified AgSnO2 electric contact material, belongingto the technical field of material metallurgy. The method comprises the following steps: adding 0.1-2.0 percent of carbonate powder relative to total weight to silver-tin kinetosome powder; mixing andgrinding into 300 meshes and pressing into biscuits under the protective atmosphere of argon; sintering the biscuits at 500-800 DEG C for 4-10 hours; pressing the sintered ingots again, sintering thesintered ingots again at 500-800 DEG C for 5-10h; and finally, and extruding the ingots which are pressed and sintered again at 400-600 DEG C for formation. The modified AgSnO2 electric contact material can replace a toxic silver cadmium oxide electric contact material, favorably solves the temperature rise problem of the electric contact material and improves the comprehensive performance of thematerial; and the prepared electric contact composite material has lower cost, greater serviceable range and longer service life.

Description

technical field [0001] The present invention relates to a kind of preparation method of electric contact material, especially a kind of carbonate modified AgSnO 2 The invention relates to a preparation method of an electric contact material, which belongs to the technical field of material metallurgy. Background technique [0002] The electrical contact material is a key factor affecting the reliability of the switch electrical contact system. The electrical contact is one of the key components of electrical equipment, and its function is to switch on and off the current. It is not only a carrier fluid, but also a mechanical component. It must have good electrical and thermal conductivity, arc burning resistance, welding resistance, small electrical wear, low and stable contact resistance, no chemical changes with the medium used, and certain Excellent strength and easy machining. [0003] The known Ag-MeO series electrical contact materials mainly include AgCdO, AgSnO 2...

Claims

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Application Information

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IPC IPC(8): H01H11/04B22F3/16
Inventor 冯晶陈敬超肖冰阮进于杰周荣
Owner KUNMING UNIV OF SCI & TECH
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