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Method for preparing a silver-based electric contact material

An electrical contact material, silver-based technology, applied in the direction of contacts, circuits, electric switches, etc., can solve problems such as inapplicability, numerous processes, and complicated process operations

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

[0006] The material prepared by the high-energy ball milling method (document 1) has high strength and good electrical properties, but it is easy to introduce impurities and is not easy to mass-produce
The material prepared by the chemical coating method (document 3) has good interface strength, excellent plasticity, and is convenient for processing. The disadvantage is that the process operation is complicated and the process is numerous
The pre-oxidation method (document 2) is a new method that has recently emerged. Its advantages are good material interface bonding strength and uniform dispersion, but it is only suitable for oxide particle reinforced series and cannot be applied to other electrical contact material systems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take the Ag-Ni20 (weight ratio) contact material reinforced by Ni particles with an average particle size of 10 kg as an example

[0027] Firstly, 8 kg of Ag metal was melted in a medium-frequency induction graphite crucible at a melting temperature of 1050°C to obtain a completely molten metal liquid.

[0028] Then use high-pressure nitrogen gas containing 2kg Ni particles to carry out spray atomization on the above-mentioned molten liquid to obtain Ni particle composite powder coated with Ag metal (that is, adopt high-pressure nitrogen gas containing reinforcement phase particles to impinge on the Ag metal liquid flow obtained after the above-mentioned smelting, Make it dispersed into fine metal droplets containing reinforcement phase particles, and obtain metal composite powder containing reinforcement phase particles after cooling to room temperature), the nitrogen gas pressure is 10MPa, and the average particle size of Ni particles is 1 μm.

[0029] The composite p...

Embodiment 2

[0034] Take the preparation of 10kg of Ag-C4 (weight ratio) contact material reinforced by graphite particles with an average particle size of 100 μm as an example

[0035] First, 9.6kg of Ag metal was melted in a medium-frequency induction graphite crucible at a melting temperature of 1300°C to obtain a completely molten metal liquid.

[0036] Then, the molten liquid was sprayed and atomized with high-pressure nitrogen containing 0.4 kg of graphite particles to obtain a graphite composite powder coated with Ag metal. The nitrogen gas pressure was 5 MPa, and the particle size of the graphite particles was 100 μm.

[0037] The composite powder obtained by spray atomization was cold isostatically pressed at 100 MPa to obtain a compact.

[0038] Then the compact is subjected to hot isostatic pressing, that is, hot isostatic pressing at 900° C. and a pressure of 100 MPa.

[0039] The green body after hot isostatic pressing is hot-extruded, the hot-extrusion temperature is 600° C....

Embodiment 3

[0042] To prepare 10kg of SnO with an average particle size of 0.1μm 2 Particle Reinforced Ag-SnO 2 10 (weight ratio) contact material as an example

[0043] First, put 9kg of Ag metal in a medium-frequency induction graphite crucible for melting at a melting temperature of 1100°C to obtain a completely molten metal liquid.

[0044] Then with 1kgSnO 2 The high-pressure nitrogen of the particles is sprayed and atomized on the above molten liquid to obtain SnO coated with Ag metal. 2 Granular composite powder, nitrogen gas pressure 0.5MPa, SnO 2 The particle size is 0.1 μm.

[0045] The composite powder obtained by spray atomization was cold isostatically pressed at 240 MPa to obtain a compact.

[0046] Then the compact is subjected to hot isostatic pressing, that is, hot isostatic pressing at 500° C. and a pressure of 200 MPa.

[0047] The green body after hot isostatic pressing is hot-extruded, the hot-extrusion temperature is 700° C., and the extrusion ratio is 350.

...

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Abstract

The invention discloses a method for preparing a silver-based electric contact material, which comprises the following steps of: adopting a method for performing injection and atomization on both solid phase powder and a liquid phase metal to obtain reinforced phase composite powder coated with a metal; and adopting a preparation means of subsequent sintering, hot pressing and squeezing to densify the composite powder so as to form the silver-based electric contact material. In the electric contact material, the reinforced phase form is granular, the reinforced phase average particle size is between 0.1 and 100 mum, and the reinforced phase weight content in the electric contact material is less than or equal to 20 percent. The electric contact material prepared by the method has the advantages of good arc ablation resistance, high conductivity and excellent mechanical properties, and the arc resistance, the conductivity, and the strength of the electric contact material are improved respectively compared with those of a same-system material prepared by the conventional powder metallurgy method.

Description

technical field [0001] The invention relates to a method in the technical field of electrical contact materials, in particular to a method for preparing a silver-based electrical contact material. Background technique [0002] The preparation methods of electrical contact materials for low-voltage electrical appliances are generally powder metallurgy and internal oxidation, and the preparation process is powder mixing, ball milling, pressing, and sintering. With the continuous improvement of application requirements, its preparation methods are gradually enriched, including high-energy ball milling method, chemical coating method, pre-oxidation method and other preparation methods, as follows: [0003] 1) Preparation of AgSnO by high energy ball milling 2 Research on Electrical Contact Materials Jian Dexiang Tianjin University Master Thesis [0004] 2) A preparation method of silver tin oxide material CN1425790A [0005] 3) Electrical contact materials for low-voltage ele...

Claims

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Application Information

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IPC IPC(8): H01H11/04H01H1/023H01H1/0233H01H1/0237B22F1/02B22F3/16
Inventor 陈乐生甘可可祁更新陈晓
Owner WENZHOU HONGFENG ELECTRICAL ALLOY
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