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Sliver stannic oxide electrical contact material and preparation method thereof

A technology of electrical contact materials, silver tin oxide, applied in the direction of contacts, circuits, electric switches, etc., can solve the problems of difficulty in adapting to electrical performance and cost requirements, poor material structure uniformity, low material cost performance, etc., and meet the requirements of oxidation equipment The effect of not high, improving tissue uniformity, and low production cost

Inactive Publication Date: 2011-04-27
GUILIN ELECTRICAL EQUIP SCI RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that due to the diffusion mechanism, the material often forms a poor oxide region in the center, and the tin oxide particles gather in the grain boundary region.
[0009] The invention patent "Internal Oxidation Method of Electrical Contact Materials and Materials Produced by the Method" with the application number of 90107574.4 discloses the scheme: a small amount of zirconium is added to the silver-tin alloy, and a high pressure of up to 20MPa is used for internal oxidation. This method can Realize complete oxidation of materials, but due to the use of high-pressure oxidation, higher requirements are placed on oxidation equipment
At the same time, this method uses hot pressing and stamping to process the final product shape and then internally oxidizes, so that there are still structural inhomogeneities such as poor oxide regions and tin oxide particle aggregation in the grain boundary region inside the material, resulting in reduced material performance and non-uniformity. Stablize
[0010] In a word, currently known internal oxidation silver tin oxide electrical contact materials and preparation processes still generally have the disadvantages of high production cost, poor material structure uniformity, and low material cost performance, and it is difficult to adapt to the current increasing demand for electrical contact materials. Electrical performance and cost requirements

Method used

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  • Sliver stannic oxide electrical contact material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A. Preparation of alloy

[0035] 0.48 kg of tin, 0.1 kg of zinc, 0.1 kg of copper, and 9.32 kg of silver were melted in a vacuum induction melting furnace and cast into alloy round ingots;

[0036] B. Broken

[0037] Using 720°C to 760°C, the alloy round ingot obtained in step A is extruded into a φ5mm alloy wire, and drawn to φ2mm, and then crushed into an alloy wire segment with a length of 10mm to 50mm, cleaned and dried;

[0038] C. Internal oxidation

[0039] The oxidation temperature in the alloy wire segment obtained in step B is 820°C, the oxidation pressure is 0.5MPa, and the oxidation time is 35h;

[0040] D. Extrusion

[0041] The oxidized material in step C is processed and then pressed and extruded into a wire or plate or strip.

[0042] The specific composition weight percentages of the silver tin oxide electrical contact material prepared in this example are as follows:

[0043]Tin oxide 6%, the total amount of additive oxides 2.45%, impurities 0.05%...

Embodiment 2

[0045] A. Preparation of alloy

[0046] 0.8 kg of tin, 0.02 kg of zinc, 0.03 kg of bismuth, 0.03 kg of copper, 0.02 kg of nickel, and 9.1 kg of silver are melted in a vacuum induction melting furnace and cast into alloy ingots;

[0047] B. Broken

[0048] Using 720°C to 760°C, the alloy round ingot obtained in step A is extruded into a φ6mm alloy wire, and drawn to φ1.3mm, then crushed into an alloy wire segment with a length of 10mm to 50mm, cleaned and dried;

[0049] C. Internal oxidation

[0050] The oxidation temperature in the alloy wire segment obtained in step B is 760°C, the oxidation pressure is 0.2MPa, and the oxidation time is 40h;

[0051] D. Extrusion

[0052] Same as Example 1.

[0053] The specific composition weight percentages of the silver tin oxide electrical contact material prepared in this example are as follows:

[0054] Tin oxide 9.9%, additive oxide total 1.51%, impurities 0.1%, silver 88.49%; Bismuth oxide content is 0.65%, copper oxide content ...

Embodiment 3

[0056] A. Preparation of alloy

[0057] 0.8 kg of tin, 0.03 kg of bismuth, 0.06 kg of copper, 0.03 kg of nickel, and 9.08 kg of silver were melted in a vacuum induction melting furnace and cast into alloy ingots;

[0058] B. Broken

[0059] Using 720°C to 760°C, the alloy round ingot obtained in step A is extruded into a φ6.3mm alloy wire, and drawn to φ1.5mm, and then crushed into an alloy wire segment with a length of 10mm to 50mm, cleaned and dried;

[0060] C. Internal oxidation

[0061] The oxidation temperature in the alloy wire segment obtained in step B is 680°C, the oxidation pressure is 0.7MPa, and the oxidation time is 30h;

[0062] D. Extrusion

[0063] Same as Example 1.

[0064] The specific composition weight percentages of the silver tin oxide electrical contact material prepared in this example are as follows:

[0065] Tin oxide is 9.9%, the total amount of additive oxides is 1.75%, impurities are 0.1%, and silver is 88.25%. Among them, the content of bis...

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Abstract

The invention discloses a sliver stannic oxide electrical contact material and a preparation method thereof. In the electrical contact material, the oxide content of tin is 6-12wt%, the total oxide content of an additive is 0.44-3.19wt%, and silver accounts for the balance. The additive is one or more of bismuth, copper, zinc and nickel, preferably the bismuth and the copper. The preparation method comprises the following steps of: smelting and pouring raw materials into alloy round ingot; extruding the alloy round ingots into alloy wires; after the wire is drawn, breaking the wire into wire sections; cleaning and drying; carrying out internal oxidation for 20-50h at the temperature of 650-820 DEG C under the oxidation pressure of 0.2-0.7MPa for 20-50h; pressing the material subjected to internal oxidation into a round ingot; and extruding the round ingot into wires or plates or strips. The electrical contact material has even tissue, high oxidation rate and density, low resistivity; and moreover, the material preparation technology is simple with low production cost and no pollutant is generated in the production process.

Description

(1) Technical field [0001] The invention relates to the technical field of silver-based electrical contact materials, in particular to a silver-tin oxide electrical contact material with bismuth, copper, zinc and nickel as additives and a preparation method thereof. (2) Background technology [0002] As an environmentally friendly silver tin oxide electrical contact material, it is widely used in various low-voltage electrical appliances due to its excellent arc corrosion resistance, wear resistance and better welding resistance, to replace toxic silver cadmium oxide Material. [0003] At present, the preparation technology of silver tin oxide electrical contact materials is mainly divided into two categories: internal oxidation method and powder metallurgy method. [0004] There are two main preparation techniques of powder metallurgy: one is to use silver powder, tin oxide powder and additives to mix, and then make products through isostatic pressing, sintering, extrusion...

Claims

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Application Information

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IPC IPC(8): C22C32/00C22C5/08C22C1/02H01H1/0237
Inventor 蒋德志谭光讯李镇鹏聂宝鑫章杰
Owner GUILIN ELECTRICAL EQUIP SCI RES INST
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