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Single-sided internal oxidation silver tin oxide indium oxide electric 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 uneven material structure, complex process, product failure, etc., and achieve the effect of convenient and reliable welding process and uniform distribution of structure

Active Publication Date: 2019-10-29
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the actual production process, since one side of the AgSnIn strip is composited with an Ag layer, after punching and internal oxidation, oxygen diffuses from both sides (including four types) to the middle for oxidation, but when oxygen diffuses to the inside, Sn and In It will also diffuse to the outside accordingly, so after internal oxidation, a so-called "poor oxide" bright band will be formed in the central area of ​​the contact, resulting in uneven material structure, and the middle "poor oxide" area has very little oxide content or There are no oxides, there are great hidden dangers in the service process of the product, which is very likely to cause fusion welding of the product during use, resulting in product failure
At the same time, because the final process of the product is internal oxidation, that is, oxidation is carried out in an environment of high temperature and high oxygen pressure, so it is difficult for internal oxidation contacts to be like powder-mixed contacts (powder-mixed method is to combine silver powder and oxidized tin powder is mixed, so there is no need for oxidation) compound solder in the front process of the strip; otherwise, even if the solder layer can be compounded, the solder will be completely oxidized in the post-oxidation process, and the ultimate goal of the self-contained solder layer cannot be achieved.
Therefore, in the general traditional internal oxidation method to prepare tin oxide indium oxide contacts, either the contact is single-contact and the solder is burned, which is complicated and inefficient, or the welding sheet or solder paste is added in the subsequent welding process, resulting in more complicated control of the welding process. , and unstable

Method used

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  • Single-sided internal oxidation silver tin oxide indium oxide electric contact material and preparation method thereof
  • Single-sided internal oxidation silver tin oxide indium oxide electric contact material and preparation method thereof

Examples

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Embodiment 1

[0049] To prepare Ag(92)SnO 2 -In 2 o 3 / AgSn20 and Ag(92)SnO 2 -In 2 o 3 / AgZn20 electrical contact material as an example

[0050] In the first step, Ag ingots, Sn ingots, In ingots, and additive Ni are melted and ingot-cast. Wherein the Ag content is 93.5wt%, the Sn content is 4.7wt%, the In content is 2.5wt%, and the Ni content is 0.3wt%.

[0051] In the second step, the alloy ingot obtained in the first step is extruded into an AgSnIn strip, wherein the extrusion temperature is 750 degrees, and the N 2 Protect. The strip width is 30mm and the thickness is 20mm.

[0052] In the third step, the AgSnIn strip is ground and polished, and the grinding brush is a resin brush.

[0053] The 4th step, with the strip after the 3rd step process, carry out two-layer cold compounding, the composite front layer is AgSnIn layer, stock thickness 20mm; Another layer of AgSn20 layer (Ag content 80wt%), stock thickness 1.74mm (according to The thickness of the finished product requ...

Embodiment 2

[0060] To prepare Ag(80)SnO 2 -In 2 o 3 / AgSn25 and Ag(80)SnO 2 -In 2 o 3 / AgZn30 electrical contact material as an example

[0061] In the first step, Ag ingots, Sn ingots, In ingots, additive Cu and Ni elements are melted and ingot-cast. Wherein the content of Ag is 83.5wt%, the content of Sn is 10.5wt%, the content of In is 5wt%, the additive Cu is 0.5wt%, and Ni is 0.5wt%.

[0062] In the second step, the alloy ingot obtained in the first step is extruded and processed into an AgSnIn strip or plate, wherein the extrusion temperature is 550 degrees, protected by charcoal; the thickness of the plate is 18mm.

[0063] In the third step, the surface of the AgSnIn strip or plate is ground and polished, and a steel wire brush is used for the grinding brush. This step can also be omitted.

[0064] The fourth step is to process the treated strip or plate with two layers of thermal composite processing, wherein the temperature is 500 degrees, and the temperature is N 2 Pro...

Embodiment 3

[0071] To prepare Ag(88)SnO 2 -In 2 o 3 / AgSn15 and Ag(80)SnO 2 -In 2 o 3 / AgZn15 electrical contact material as an example

[0072] In the first step, Ag ingots, Sn ingots, In ingots, and additive Zn elements are melted and ingot-cast. The content of Ag is 89.5wt%, the content of Sn is 5.5wt%, the content of In is 4.5wt%, and the additive Zn is 0.5wt%.

[0073] In the second step, the alloy ingot obtained in the first step is forged to be processed into an AgSnIn plate, which is forged at 750 degrees, protected by charcoal, and the thickness of the plate is 18mm.

[0074] In the third step, the surface of the AgSnIn plate is ground and polished, and a steel wire brush is used for the grinding brush.

[0075] The fourth step is to carry out two-layer cold compounding of the processed plate. The previous layer of compounding is an AgSnIn layer with a stock thickness of 18mm; the other layer of AgSn15 layer (Ag content 85wt%) and a stock thickness of 6mm (according to the...

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Abstract

The invention discloses a single-sided internal oxidation silver tin oxide indium oxide electric contact material which comprises a silver tin oxide indium oxide material body. One side of the silvertin oxide indium oxide material body is a solder surface with a solder. The solder surface is composed of an AgSn layer or an AgZn layer. The other side of the silver tin oxide indium oxide material body is an oxidation surface. The oxidation surface is an AgSnO2In2O3 layer. The invention further provides a preparation method of the material. According to the acquired single-sided internal oxidation silver tin oxide indium oxide electric contact material, subsequent welding is convenient and reliable; the acquired silver tin oxide indium oxide is single-sided oxidation, which prevents an intermediate 'lean oxide' area; and tissue distribution is even.

Description

technical field [0001] The invention relates to a preparation method of an electrical contact material in the field of material technology, in particular to a self-contained solder, silver oxide tin oxide indium oxide electrical contact material on one side and a preparation method thereof. Background technique [0002] Electrical contact material is a functional composite material that is responsible for the "connection-conduction-cut-off" current and the functional carrier of signal generation and transmission in switching appliances. The performance of electrical contact materials directly affects the reliability, stability, and accuracy of electronic products. and service life. Preparation of silver tin oxide indium oxide (AgSnO 2 -In 2 o 3 ) materials are widely used in various electrical appliances due to their good electrical life, excellent arc erosion resistance, wear resistance and welding resistance. Relevant research and reports at home and abroad in recent y...

Claims

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Application Information

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IPC IPC(8): H01H1/0237H01H11/04C22C5/06C22F1/14C22F1/02C21D9/54
CPCC21D9/0081C21D9/54C22C5/06C22F1/02C22F1/14H01H1/02372H01H11/048
Inventor 穆成法杨辉
Owner ZHEJIANG UNIV
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