Preparation method of fine-particle stannic oxide reinforced Ag-based electrical contact material

An electrical contact material, tin oxide technology, applied in contacts, circuits, electrical switches, etc., can solve the problems of insufficient particle dispersion, insufficient strength, slow internal oxidation speed, etc., and achieve resistance to welding and arc burning. The effect of improved corrosion performance, improved material strength and hardness, and simple and flexible process operation

Active Publication Date: 2010-05-12
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 into powder and then pre-oxidize it. For the AgSn alloy powder with more than 4% Sn content, the internal oxidation speed is still very slow, and at the same time, 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 operation, but the material obtained by its preparation has the disadvantages of poor compactness, insufficient strength, and insufficient particle dispersibility
However, the preparation process of the chemical coating method is complicated and difficult to operate.

Method used

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  • Preparation method of fine-particle stannic oxide reinforced Ag-based electrical contact material
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  • Preparation method of fine-particle stannic oxide reinforced Ag-based electrical contact material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. The AgSn alloy powder obtained by the atomization method, wherein the Sn content is 18%, and the balance is Ag. 10kgAgSn alloy powder and 130g WO after passing through a 100 mesh sieve 3 powder loading figure 2 In the ball mill jar shown, add the balls according to the ball-to-material ratio of 50:1, and then put figure 2 The lid of the ball mill shown is closed and tightened, after which the oxygen is passed through figure 2 Fill the air pipe shown in the ball mill tank to make the oxygen pressure in the ball mill tank reach 0.5MPa. The ball milling speed is 500 rpm, the ball milling time is 3h, the ball milling atmosphere is oxygen, and the oxygen pressure is 0.5MPa;

[0037] 2. After ball milling, the powder was annealed in air at 300°C for 5 hours;

[0038] 3. Then press the annealed powder into a billet under isostatic pressure of 500MPa;

[0039] 4. Sinter the pressed body at 900°C for 2 hours in an oxygen atmosphere;

[0040] 5. Hot press the sintered...

Embodiment 2

[0045] 1. AgSnCu alloy powder obtained by atomization method, wherein the content of Sn is 3%, and the balance is Ag. 10kg of AgSn alloy powder after passing through a 100 mesh sieve is packed into figure 2 In the ball mill jar, add the balls at a ball-to-material ratio of 1:1, and figure 2 The cover of the medium ball mill tank is closed and tightened, and then the oxygen is passed through figure 2The middle air pipe is filled into the ball mill tank, so that the oxygen pressure in the ball mill tank is 5MPa. The ball milling speed is 200 rpm, the ball milling time is 30h, the ball milling atmosphere is oxygen, and the oxygen pressure is 5MPa;

[0046] 2. After ball milling, the powder is annealed in air at 800°C for 1 hour;

[0047] 3. Then press the annealed powder into a billet under an isostatic pressure of 100 MPa;

[0048] 4. Sinter the pressed body at 600°C for 10 hours in an oxygen atmosphere;

[0049] 5. Hot press the sintered body at 300MPa at 900°C for 30 m...

Embodiment 3

[0054] 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. 10kg AgSnCu alloy powder and 100g WO 3 Powder mixing ball milling, the ball-to-material ratio is 15:1, the ball milling speed is 300 rpm, the ball milling time is 10h, the ball milling atmosphere is oxygen, and the oxygen pressure is 1MPa;

[0055] 2. After ball milling, the powder is annealed in air at 600°C for 3 hours;

[0056] 3. Then the annealed powder is pressed into a billet under an isostatic pressure of 300MPa;

[0057] 4. Sinter the pressed body at 800°C for 5 hours in an oxygen atmosphere;

[0058] 5. Hot press the sintered green body at 500MPa at 600°C for 15 minutes;

[0059] 6. Then refire the hot-pressed green body, that is, sinter at 800°C for 5 hours in an oxygen atmosphere;

[0060] 7. Finally, hot-extrude the refired green body. The heating temperature of the hot-extruded green body is 800°C, the mold is preheat...

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Abstract

The invention discloses a preparation method of fine-particle stannic oxide reinforced Ag-based electrical contact material, which adopts AgSn alloy powder to be mixed and collide mutually in the ball milling process, and keeps high-pressure oxidative atmosphere in the ball milling process simultaneously to lead the pre-oxidation of the AgSn alloy powder and the ball milling dispersing process to be conducted synchronously, thus greatly shortening the pre-oxidation time of the AgSn alloy, avoiding high-temperature oxidation and improving SnO2 distribution condition. The method has the characteristic of simple and flexible operation, and the silver tin oxide prepared by the method has the ideal structure of submicron or nanometer SnO2 particle reinforced phase dispersed distribution, thus leading the material to have high strength, high electrical 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 a fine particle tin oxide-reinforced silver-based electrical contact material. Electrical contacts used in contactor switches and bimetallic 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: the materials are required to have better resistance to fusion welding, mechanical resistance and electrical wear resistance; less metal spatter generated during the breaking process, and less combustion. The arc 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H11/04H01H1/023H01H1/0233H01H1/0237B22F3/16C22C1/05C22C5/06C22F1/14
Inventor 陈乐生甘可可祁更新陈晓
Owner WENZHOU HONGFENG ELECTRICAL ALLOY
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