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Method for preparing rare-earth contact material

A technology of contact material and manufacturing method, which is applied in the field of alloy manufacturing, can solve problems such as excessive loss of CdO at decomposition temperature, electrical life, and reduced service life, and achieve excellent welding resistance, good oxidation effect, and low contact resistance. Effect

Active Publication Date: 2015-04-08
宁波科扬贵金属合金科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The low decomposition temperature of CdO leads to excessive loss of CdO, which reduces its service life. In order to solve the problem of AgCdO's electrical life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: Silver, cadmium, and rare earth materials (rare earth purity 98%) are taken according to the ratio of weight ratio: 94.8:5:0.2, 49.2 kg of silver, 2.5 kg of cadmium, and 0.1 kg of rare earth materials are put into a smelting furnace and smelted into In liquid state, the melting temperature is 1200°C. After the metal is smelted into a liquid, the melted liquid is cast into an ingot under the protection of argon gas. After a little cooling, the ingot is machined to make it meet the requirements of the equipment for the next step of hot extrusion. pressure. In addition, the machined ingot is put into the equipment for hot extrusion at a temperature of 890°C. The hot-extruded wire was subjected to pre-oxidation treatment, the pre-oxidation temperature was 750° C., the pre-oxidation time was 24 hours, and the oxygen pressure was 0.4 MPa. After the pre-oxidation is completed, the material is subjected to secondary hot extrusion. The secondary hot extrusion temp...

Embodiment 2

[0023] Example 2: Silver, cadmium, and αβ mixed rare earth materials (rare earth purity 98%) are mixed according to the weight ratio: 92.9:7:0.1, and 46.5 kg of silver, 3.5 kg of cadmium, and 0.05 kg of αβ mixed rare earth materials are put into smelting It is melted into a liquid state in the furnace, and the melting temperature is 1250°C. After the metal is melted into a liquid, the melted liquid is cast into an ingot under the protection of argon, and the ingot is machined after a little cooling to make it meet the requirements of the equipment. The next step is hot extrusion. In addition, the machined ingot is put into the equipment for hot extrusion at a temperature of 860°C. The hot-extruded wire rod was subjected to pre-oxidation treatment, the pre-oxidation temperature was 680° C., the pre-oxidation time was 28 hours, and the oxygen pressure was 0.6 MPa. After the pre-oxidation is completed, the material is subjected to secondary hot extrusion. The temperature of the ...

Embodiment 3

[0026] Example 3: Put silver, cadmium, and mixed rare earth materials (rare earth purity 98%) at a weight ratio of 93.8:6:0.2, take 46.9 kg of silver, 3 kg of cadmium, and 0.1 kg of mixed rare earth materials, and put them into a melting furnace for melting into a liquid state, the melting temperature is 1230°C, after the metal is smelted into a liquid, the smelted liquid is cast into an ingot under the protection of argon, and after a little cooling, the ingot is machined to make it meet the requirements of the equipment for the next step of heating extrusion. In addition, the machined ingot is put into the equipment for hot extrusion at a temperature of 880°C. The hot-extruded wire was subjected to pre-oxidation treatment, the pre-oxidation temperature was 720° C., the pre-oxidation time was 26 hours, and the oxygen pressure was 0.5 MPa. After the pre-oxidation is completed, the material is subjected to secondary hot extrusion. The temperature of the secondary hot extrusion...

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Abstract

The invention discloses a method for preparing a rare-earth contact material. The method comprises the following steps: (1) smelting, namely smelting silver, cadmium, and rare earth materials at 1200-1250 DEG C; (2) casting an ingot, namely a casting molten liquid into the ingot in the presence of an inert gas; (3) machining; (4) carrying out hot extrusion at a hot extrusion temperature of 780-820 DEG C; (5) carrying out pre-oxidation treatment at 680-750 DEG C for 24-48 hours, wherein the oxygen pressure is 0.4-0.6MPa; (6) crushing and molding; (7) carrying out secondary hot extrusion at 860-890 DEG C, wherein the retention time is greater than or equal to 3 hours, and the extrusion ratio is greater than 240 to 1; and (8) processing a wire rod, namely carrying out annealing treatment on the wire rod at no less than 650 DEG C for more than an hour, and carrying out homogenization treatment on the wire rod at 250-380 DEG C for more than an hour. The AgCdO contact material prepared by the method is relatively excellent in melting-welding resistance, relatively low and stable in contact resistance, relatively low in temperature rise, and relatively excellent in melting-welding resistance.

Description

technical field [0001] The invention belongs to the technical field of alloy manufacturing, and in particular relates to a method for manufacturing a rare earth contact material. Background technique [0002] With the development of science and technology, the demand for electromechanical components in the field of industrial manufacturing is increasing, and the requirements for their performance indicators are also getting higher and higher. AgCdO contact material has excellent resistance to welding and arc erosion, relatively stable contact resistance, good electrical conductivity, and thermal conductivity. Therefore, it has become the main conductive contact material since its practical application in 1950, and the production of materials With the continuous improvement of processing methods, AgCdO contact material is still one of the contact materials with excellent performance among many contact materials. [0003] At present, AgCdO contact material is also the most wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C5/10B23P15/00H01H1/0237H01H11/04
Inventor 孙珂杨
Owner 宁波科扬贵金属合金科技有限公司
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