Preparing method of AgSnO electric contact materials with uniform tissues

An electrical contact material, silver tin oxide technology, applied in metal material coating process, circuits, relays, etc., can solve problems such as aggregation and silver aggregation, and achieve the effect of simple process flow, easy production, and improved material transfer resistance.

Active Publication Date: 2014-04-02
ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to overcome the problems of oxide aggregation and silver aggregation in the electrical contact materials in the prior art, and provide a method for preparing a silver-tin oxide electrical contact material with uniform structure, thereby improving its anti-material transfer performance

Method used

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  • Preparing method of AgSnO electric contact materials with uniform tissues
  • Preparing method of AgSnO electric contact materials with uniform tissues
  • Preparing method of AgSnO electric contact materials with uniform tissues

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Melt Ag ingots, Sn ingots, and additives (In, Ga, Ce) with a composition ratio of Ag86Sn8In3Cu2Ga1 (by weight percentage) and cast them into round ingots, and then use a lathe to remove 4mm of surface oxide scale;

[0038] (2) extrusion, heating temperature 660°C, heat preservation 6h, obtain Φ4mm wire;

[0039] (3) Pulled to Φ2.5mm;

[0040] (4) punching and pressing the ingot, wherein the length of the broken wire is 30mm, the diameter of the spindle is 80mm, and the pressure is 8MPa;

[0041] (5) The oxidation temperature is 750°C, the oxygen pressure is 5MPa, the oxidation time is 5h, the diameter of the spindle after repressing is 85mm, the repressing pressure is 50MPa, and the surface of the spindle is turned to 4mm;

[0042] (6) The extrusion heating temperature is 900°C, and the holding time is 5 hours to obtain a Φ7mm wire, and then hot-drawn to a finished wire of Φ1.5mm;

[0043] (7) Make rivets with the wires of the above specifications, and conduct ele...

Embodiment 2

[0050] (1) Melt Ag ingots, Sn ingots, and additives (In, Zr, Co) with a composition ratio of Ag92Sn5In2Ce0.3Zr0.3Co0.2 (by weight percentage) and cast them into round ingots, and then use a lathe to remove surface oxidation Leather 3mm;

[0051] (2) extrusion, heating temperature 770°C, heat preservation 3h, obtain Φ3mm wire;

[0052] (3) Pulled to Φ2.5mm;

[0053] (4) punching and pressing the ingot, wherein the length of the broken wire is 20mm, the diameter of the spindle is 85mm, and the pressure is 12MPa;

[0054] (5) The oxidation temperature is 850°C, the oxygen pressure is 2MPa, the oxidation time is 10h, the diameter of the spindle after repressing is 85mm, the repressing pressure is 60MPa, and then the surface of the spindle is turned to 2mm;

[0055] (6) Extrusion heating temperature is 800°C, heat preservation for 8 hours, and then heat preservation time at 900°C for 2 hours, the wire specification after extrusion is Φ5mm, and then hot drawn to the finished wire ...

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Abstract

The invention relates to a preparing method of AgSnO electric contact materials with uniform tissues. The method comprises the steps of smelting, surface treatment, extrusion, drawing, pushing and cutting, ingot pressing, inner oxidation, re-pressing, surface treatment, extrusion and drawing, wherein additives are any two kinds of materials or more than two kinds of materials from Cu, Ga, Ce, Zr and CO. The materials comprise the following ingredients in percentage by weight: 86 to 92 percent of Ag, 5 to 8 percent of Sn, 2 to 3 percent of In, 0 to 2 percent of Cu, 0 to 1 percent of Ga, 0 to 0.2 percent of Ce, 0 to 0.3 percent of Zr and 0 to 0.5 percent of Co. The key steps of the process include the ingot pressing after the wire material pushing and cutting,the inner oxidization, the re-pressing and the surface treatment. The wire materials prepared by the method have the advantages that the metallographic structure is uniform, and the oxide aggregation and silver aggregation phenomena do not occur. Meanwhile, the hardness of the wire materials is low, the elongation percentage is high, after the materials are made into rivets, electric performance tests are carried out, the material transfer resistance performance is good, and the AgSnO electric contact materials prepared by the method are suitable for being applied to various different vehicle-mounted relays.

Description

technical field [0001] The invention relates to electrical materials, in particular to a method for preparing a uniform silver tin oxide electrical contact material. Background technique [0002] Automotive relays are important control components in automotive electrical systems, and are widely used in systems such as controlling automotive starting, preheating, air conditioning, lighting, automotive electronic instruments, and fault diagnosis. The electrical contact material is one of the core components of the relay, and its pros and cons are decisive for ensuring the reliability and stability of the on-board relay. [0003] At present, the electrical contact materials used in automotive relays are mainly silver tin oxide. Due to the problems of oxide aggregation and silver aggregation in electrical contact materials, the materials have problems such as short electrical life and serious material transfer. [0004] Through relevant literature search, the methods for prepar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H49/00C22C5/06C22C1/02C23C8/12
Inventor 李杰颜小芳柏小平翁桅杨坤刘立强林万焕
Owner ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD
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