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Preparation method of silver tin oxide contact material for improving sintering property of ingot blank

A silver tin oxide, sintering technology, used in contacts, electrical components, electrical switches, etc., can solve the problems of hindering the contact and diffusion of Ag between powders, complex chemical co-precipitation process, poor processing performance, etc., to enhance mutual Sintering diffusion, superior sintering performance, and the effect of improving processability

Active Publication Date: 2019-04-09
桂林金格电工电子材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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.

Method used

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  • Preparation method of silver tin oxide contact material for improving sintering property of ingot blank
  • Preparation method of silver tin oxide contact material for improving sintering property of ingot blank
  • Preparation method of silver tin oxide contact material for improving sintering property of ingot blank

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Effect test

Embodiment 1

[0034] 1) Weigh each component according to the following mass percentages, place it in an intermediate frequency induction melting furnace and smelt into a uniform alloy melt, then atomize by high-pressure water atomization equipment, and dry the obtained powder slurry for a temperature of over 200 Mesh sieve, very silver-tin alloy powder;

[0035] Sn: 9.5%;

[0036] Additive: Bi 0.1%;

[0037] The remainder is Ag;

[0038] 2) placing the silver-tin alloy powder in a high-pressure oxidation furnace, oxidizing it for 6 hours under the conditions of an oxygen partial pressure of 1 MPa and a temperature of 700° C., taking out, crushing, and passing through a 100-mesh sieve to obtain a silver-tin oxide composite powder;

[0039] 3) The silver tin oxide composite powder is placed in a high-energy ball mill, and wet grinding is carried out under the protection of atmosphere (Ar) until the particle size of the obtained powder is 1 to 2 μm, and the wet-milled powder is placed in an...

Embodiment 2

[0051] 1) Weigh each component according to the following mass percentages, place it in an intermediate frequency induction melting furnace and smelt into a uniform alloy melt, then atomize by high-pressure water atomization equipment, and dry the obtained powder slurry for a temperature of over 200 Mesh sieve, very silver-tin alloy powder;

[0052] Sn: 8%;

[0053] Additives: In 1%, Cu 1%, Ni 1%;

[0054] The remainder is Ag;

[0055] 2) placing the silver-tin alloy powder in a high-pressure oxidation furnace, oxidizing it for 4 hours under the conditions of an oxygen partial pressure of 2 MPa and a temperature of 800° C., taking it out, crushing it, and passing it through a 100-mesh sieve to obtain a silver-tin oxide composite powder;

[0056] 3) The silver tin oxide composite powder is placed in a high-energy ball mill, and wet-milling is carried out under the protection of atmosphere (Ar) until the particle size of the obtained powder is 2-4 μm, and the wet-milled powder...

Embodiment 3

[0061] 1) Weigh each component according to the following mass percentages, place it in an intermediate frequency induction melting furnace and smelt into a uniform alloy melt, then atomize by high-pressure water atomization equipment, and dry the obtained powder slurry for a temperature of over 200 Mesh sieve, very silver-tin alloy powder;

[0062] Sn: 10%;

[0063] Additives: Zn2%;

[0064] The remainder is Ag;

[0065] 2) placing the silver-tin alloy powder in a high-pressure oxidation furnace, oxidizing it for 8 hours under the conditions of an oxygen partial pressure of 0.5 MPa and a temperature of 800° C., taking it out, crushing it, and passing it through a 100-mesh sieve to obtain a silver-tin oxide composite powder;

[0066] 3) The silver tin oxide composite powder is placed in a high-energy ball mill, and wet grinding is carried out under the protection of atmosphere (Ar) until the particle size of the obtained powder is 3 to 5 μm, and the wet-milled powder is plac...

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Abstract

The invention discloses a preparation method of a silver tin oxide contact material for improving the sintering property of an ingot blank. The method comprises the following steps that 1) according to the material proportion of a silver tin oxide contact needing to be prepared, silver, tin, and additives with the corresponding dosage are calculated and weighed, the mixture is melted and then atomized to prepare powder to obtain silver-tin alloy powder; 2) the silver-tin alloy powder is oxidized to obtain silver tin oxide composite powder; 3) the silver tin oxide composite powder is subjectedto wet grinding under a protective atmosphere condition so as to obtain the ball-milled silver tin oxide composite powder; 4) the ball-milled silver tin oxide composite powder is formed to obtain a silver tin oxide blank body; 5) the obtained silver tin oxide blank body is placed at the condition with the oxygen partial pressure higher than or equal to 0.8 Mpa, and the temperature of 900-960 DEG Cto be sintered to obtain the silver tin oxide ingot blank; and 6) the obtained silver tin oxide ingot blank is subjected to hot extrusion to obtain a silver tin oxide wire rod or a silver tin oxide strip material. The silver tin oxide contact material prepared by the method is uniform in structure and good in processing performance.

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 silver tin oxide contact material for improving the sinterability of an ingot. Background technique [0002] Electrical contacts are the core components of various high and low switches, electrical appliances, instruments and components, and are widely used in aerospace, aviation, automotive and other industrial fields and large-capacity AC / DC contactors, AC / DC power relays, automotive electrical appliances and other industrial fields. Small and medium-capacity low-voltage circuit breakers. There are many types 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 "uni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C29/12H01H1/0237
CPCC22C1/056C22C29/12H01H1/02376
Inventor 李波
Owner 桂林金格电工电子材料科技有限公司
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