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Preparation method of tin-oxygen-silver electric contact material

A technology of electrical contact materials, silver tin oxide, applied in the direction of circuits, electric switches, electrical components, etc., can solve the problems of uneven material structure, poor material compactness, poor processing performance, etc., and achieve shortened preparation cycle and anti-welding The effect of sex improvement and strength improvement

Active Publication Date: 2010-02-17
WENZHOU HONGFENG ELECTRICAL ALLOY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The powder pre-oxidation method is to atomize the AgSn alloy first, and then pre-oxidize it. This method is still very slow for the internal oxidation of the AgSn alloy powder with a Sn content of more than 4%, and it is easy to form SnO 2 In the case of Ag-coated particles, SnO is easy to form during powder metallurgy processing 2 Structure that isolates the Ag matrix, resulting in poor processability
Preparation of Ag-SnO by Powder Metallurgy 2 The material has the characteristics of easy addition and simple operation, but the material obtained by its preparation has the disadvantages of poor compactness and insufficient strength
Ag-SnO prepared by chemical coating method 2 The material has good processing performance and high interface bonding strength, but the process is complicated and difficult to operate
In summary, the existing Ag-SnO 2 The material preparation method has the disadvantages of long cycle, complicated operation, and uneven structure of the obtained material.

Method used

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  • Preparation method of tin-oxygen-silver electric contact material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1. Put the Ag metal block and the Sn metal sheet in a medium frequency induction heating furnace to melt them into an alloy melt. At about 1050°C, use high-pressure air to forcefully impact and atomize the small flow of the above melt into powder, and the obtained AgSn Alloy powder, wherein the content of Sn is 18%, and the balance is Ag. 10kg AgSn alloy powder, 3kg silver nitrate and 130g WO after crossing 100 mesh sieve 3 Powder mixing ball milling, the ball-to-material ratio is 50:1, the ball milling speed is 500 rpm, the ball milling time is 3 hours, and the ball milling atmosphere is air;

[0036] 2. After ball milling, the powder was annealed in air at 300°C for 5 hours;

[0037] 3. Then press the annealed powder into a billet under isostatic pressure of 500MPa;

[0038] 4. Sinter the pressed body at 900°C for 2 hours in an oxygen atmosphere;

[0039] 5. Hot press the sintered body at 700MPa at 400°C for 1 minute;

[0040] 6. Then refire the hot-pressed green ...

Embodiment 2

[0044] 1. Put the Ag metal block, Sn metal sheet and Cu metal sheet in a medium-frequency induction heating furnace to melt them into an alloy melt, then cool them to obtain AgSnCu ingots, and turn the ingots to obtain AgSnCu alloy chips, in which Sn The content is 3%, and the balance is Ag. 10kg of AgSn alloy powder and 500g of silver nitrate powder passed through a 100-mesh sieve were mixed and ball-milled, the ball-to-material ratio was 1:1, the ball-milling speed was 15 revolutions, the ball-milling time was 30 hours, and the ball-milling atmosphere was air;

[0045] 2. After ball milling, the powder is annealed in air at 800°C for 1 hour;

[0046]3. Then press the annealed powder into a billet under an isostatic pressure of 100 MPa;

[0047] 4. Sinter the pressed body at 600°C for 10 hours in an oxygen atmosphere;

[0048] 5. Hot press the sintered body at 300MPa at 900°C for 30 minutes;

[0049] 6. Then refire the hot-pressed green body, that is, sinter at 600°C for 1...

Embodiment 3

[0053] 1. AgSnCu alloy powder obtained by atomization method, wherein the content of Sn is 10%, the content of Cu is 3%, and the balance is Ag. 10kgAgSnCu alloy powder, 1.5kg silver nitrate and 130gWO after passing through a 100 mesh sieve 3 Powder mixing ball milling, the ball-to-material ratio is 15:1, the ball milling speed is 150 rpm, the ball milling time is 10 hours, and the ball milling atmosphere is air;

[0054] 2. After ball milling, the powder is annealed in air at 600°C for 3 hours;

[0055] 3. Then the annealed powder is pressed into a billet under an isostatic pressure of 300MPa;

[0056] 4. Sinter the pressed body at 800°C for 5 hours in an oxygen atmosphere;

[0057] 5. Hot press the sintered green body at 500MPa at 600°C for 15 minutes;

[0058] 6. Then refire the hot-pressed green body, that is, sinter at 800°C for 5 hours in an oxygen atmosphere;

[0059] 7. Finally, hot-extrude the refired green body. The heating temperature of the hot-extruded green bo...

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Abstract

The invention discloses a preparation method of a tin-oxygen-silver electric contact material. The method adopts AgSn alloy powder and strong oxidizer powder to mix and collide with each other in theball milling process and realizes the AgSn alloy powder preoxidation and ball milling dispersion processes at the same time so as to greatly shorten the time of AgSn alloy preoxidation and improve thedistribution of SnO2. The invention is characterized by simple and flexible operation and the tin-oxygen-silver material prepared by the method of the invention has the ideal structure that the submicron SnO2 particle reinforced phase is scattered in dispersion manner so as to ensure the material to have high strength and conductivity and excellent electrical properties.

Description

technical field [0001] The present invention relates to a method for preparing an electrical contact material, in particular to a method for preparing an electrical contact material of silver tin oxide. Point and composite rivet electrical contacts, sheets, etc. Background technique [0002] With the development of electrical products in the direction of large capacity and small volume, the requirements for electrical contact materials are increasing: it is required that the materials do not undergo welding under the conditions of extreme arc heat and Joule heat, and have better mechanical and electrical wear resistance; In the breaking process, there is less metal spatter and the arcing time is short; in the DC environment, it has good welding resistance, less material transfer, and low and stable contact resistance. [0003] Although the currently widely used silver cadmium oxide electrical contact material has excellent performance and low material cost, especially the h...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C1/10C22C32/00H01H11/04
Inventor 甘可可祁更新陈晓陈乐生
Owner WENZHOU HONGFENG ELECTRICAL ALLOY
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