High-ductility silver tin oxide contact material preparation method

A technology of silver tin oxide and contact materials, which is applied in the direction of contacts, metal processing equipment, electrical components, etc., can solve the problems of hindering the contact and diffusion of Ag between powders, poor processing performance, and serious aggregation of oxide particles, and achieve enhanced Mutual sintering diffusion effect, effect of improving processability

Inactive Publication Date: 2019-04-12
桂林金格电工电子材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods have their own shortcomings: the materials made by powder metallurgy have low density, large contact resistance, and high temperature; the surface and internal structure of materials prepared by internal oxidation are not uniform, the oxide particles are seriously aggregated, and there is a poor oxide layer in the middle; Co-precipitation process is more complicated, and problems such as chemical pollution will occur during the preparation process
As mentioned earlier, in the alloy powder oxidation stage due to the SnO 2 The thermodynamic stability is higher than that of Ag 2 O, so the oxidation of Sn is prior to the oxidation of Ag, SnO 2 Segregation occurs on the surface of powder particles, which hinders the contact and diffusion of Ag between powders in the subsequent sintering process, so there are problems such as difficult sintering of the green body and poor processability.

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  • High-ductility silver tin oxide contact material preparation method
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  • High-ductility silver tin oxide contact material preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0031] 1) Weigh each component according to the following mass percentage, place it in an intermediate frequency induction melting furnace and melt it into a uniform alloy melt, and then atomize it through a high-pressure water atomization equipment, dry the obtained powder slurry, pass 200 Mesh sieve, very fine silver tin alloy powder;

[0032] Sn: 9.5%;

[0033] Additives: Bi 0.27%, Cu 0.33%, Ni 0.15%;

[0034] The balance is Ag;

[0035] 2) Put the silver-tin alloy powder in a high-energy ball mill, and carry out wet grinding treatment under the protection of the atmosphere (Ar), until the particle size of the obtained powder is 1-5 μm, and place the wet-milled powder in an oven at 80 Dry at ℃ for 10 hours to obtain silver-tin alloy powder after ball milling; in wet milling, the mass ratio of ball to material is 3:1, the ball milling medium is absolute ethanol, the mass ratio of medium to material is 0.5:1, and the ball milling speed is 500rmp, ball milling time is 15h; ...

Embodiment 2

[0047] 1) Weigh each component according to the following mass percentage, place it in an intermediate frequency induction melting furnace and melt it into a uniform alloy melt, and then atomize it through a high-pressure water atomization equipment, dry the obtained powder slurry, pass 200 Mesh sieve, very fine silver tin alloy powder;

[0048] Sn: 8%;

[0049] Additives: In 3.5%, Cu 0.3%, Ni 0.2%;

[0050] The balance is Ag;

[0051] 2) Put the silver-tin alloy powder in a high-energy ball mill, and carry out wet grinding treatment under the protection of the atmosphere (Ar), until the particle size of the obtained powder is 1-2 μm, and place the wet-milled powder in an oven at 100 Dry at ℃ for 6 hours to obtain silver-tin alloy powder after ball milling; during wet milling, the mass ratio of ball to material is 10:1, the ball milling medium is absolute ethanol, the mass ratio of medium to material is 2:1, and the ball milling speed is 250rmp, ball milling time is 6h;

...

Embodiment 3

[0057] 1) Weigh each component according to the following mass percentage, place it in an intermediate frequency induction melting furnace and melt it into a uniform alloy melt, and then atomize it through a high-pressure water atomization equipment, dry the obtained powder slurry, pass 200 Mesh sieve, very fine silver tin alloy powder;

[0058] Sn: 10%;

[0059] Additives: Cu 0.1%;

[0060] The balance is Ag;

[0061] 2) Put the silver-tin alloy powder in a high-energy ball mill, and carry out wet grinding treatment under the protection of the atmosphere (Ar), until the particle size of the obtained powder is 3-5 μm, and place the wet-milled powder in an oven at 90 Dry at ℃ for 9 hours to obtain silver-tin alloy powder after ball milling; in wet milling, the mass ratio of ball to material is 5:1, the ball milling medium is anhydrous ethanol, the mass ratio of medium to material is 1:1, and the ball milling speed is 400rmp, ball milling time is 10h;

[0062] 3) Place the b...

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Abstract

The invention discloses a high-ductility silver tin oxide contact material preparation method. The method comprises the following steps that (1) the silver tin oxide contact material ratio is preparedas required, the corresponding amount of silver, the corresponding amount of tin and the corresponding amount of an additive are calculated and weighed and then atomized to be made into powder afterbeing melted, and silver-tin alloy powder is obtained; (2) the silver-tin alloy powder is subjected to wet milling under the protective atmosphere condition, and silver-tin alloy powder subjected to ball milling is obtained; (3) the silver-tin alloy powder subjected to ball milling is oxidized, and silver tin oxide composite powder is obtained; (4) the silver tin oxide composite powder is subjected to molding, and a silver tin oxide blank is obtained; (5) the silver tin oxide blank is subjected to sintering under the condition that the oxygen partial pressure is higher than or equal to 0.8 Mpaand the temperature is 900-960 DEG C, and a high-ductility silver tin oxide ingot blank is obtained; and (6) the silver tin oxide ingot blank is subjected to heat extrusion, and a silver tin oxide wire rod or strip is obtained. A silver tin oxide contact material prepared through the method is uniform in structure and high in ductility, and the processability of the material is effectively improved.

Description

technical field [0001] The invention relates to a preparation method of a silver tin oxide contact, in particular to a preparation method of a high ductility silver tin oxide contact material. Background technique [0002] Electric contacts are the core components of various high and low switches, electrical appliances, instruments and components, and are widely used in aerospace, aviation, automobile and other industrial fields as well as large-capacity AC-DC contactors, AC-DC power relays, automotive electrical appliances and Small and medium capacity low voltage circuit breakers. There are many kinds of electrical contacts, commonly used are silver-based alloys and copper-based alloys. Among the silver-based alloys, the silver-cadmium oxide contact material has good arc wear resistance, welding resistance, electrical conductivity and thermal conductivity, and has low contact resistance and high stability. It is called "universal contact material". However, due to the da...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C5/06C22C32/00H01H1/0237B22F9/08B22F9/04B22F3/10
CPCH01H1/02376C22C1/05C22C5/06C22C32/0021B22F3/1007B22F9/04B22F9/082B22F2998/10B22F2999/00B22F2009/043B22F2201/02B22F2201/10B22F2201/03B22F1/145B22F2003/208B22F3/04
Inventor 李波
Owner 桂林金格电工电子材料科技有限公司
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