A kind of manufacturing method of silver tin oxide contact material

Abstract

A silver tin oxide (AgSnO2) contact material making method comprises the following steps: (1) smelting, to be more specific, smelting silver, tin and rare earth materials; (2) preparation of atomized powder, to be more specific, the size of prepared powder is-200 mesh to-300 mesh; (3) pre oxidation treatment, to be more specific, oxidation temperature is 650 DEG C to 700 DEG C, the oxygen partial pressure is 0.4Mpa-1.6Mpa, and the oxidation time is 30 minutes to 60 minutes; (4) isostatic compaction, to be more specific, pressure is 60Mpa-70Mpa; (5) sintering; (6) extrusion processing, to be more specific, the extrusion temperature is 860 DEG to 880 DEG C, the extrusion speed is 1-1.5 m / s; (7) wire processing; and (8) contact processing. The silver tin oxide contact material making method has the following advantages: the silver tin oxide contact material making method shortens the production cycle, the production cycle is shortened by nearly 30% compared with that of original two technical methods, the production efficiency is improved; after molding, product quality is good, machining performance is excellent; electric abrasion loss of AgSnO2 prepared by the method is 20% lower than that of AgSnO2 prepared by a conventional manufacturing method, electric life is improved by more than 20%; contact resistance and temperature rise are low, the temperature rise is equal to or less than 35K; and the temperature rise is20% lower than that of the traditional process method.

Description

technical field [0001] The invention belongs to the technical field of alloy manufacture, and in particular relates to a method for manufacturing a silver tin oxide 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. Silver tin oxide rare earth contact material is a new type of non-toxic electrical contact material that has developed rapidly in recent years. It has the advantages of good thermal stability, arc erosion resistance and strong welding resistance. It is currently used in the field of contactors and relays. an ideal material. [0003] At present, the manufacturing methods of silver tin oxide at home and abroad are roughly divided into two categories, namely, alloy internal oxidation method and powder metallurgy method. The problem e...

AI Technical Summary

Problems solved by technology

The problem existing in the alloy internal oxidation method is that it cannot solve the problem of Sn oxidation in the alloy. If Sn is to be completely oxidized in the alloy, a high-temperature container with a pressure resistance greater than 20Mpa is required, which is quite difficult in the current production field. Therefore, when using this method, it is necessary to add a certain amount of In or Bi to the alloy to fully oxidize Sn under normal conditions, but the addition of In or Bi will greatly reduce the overall electrical properties of the material. And the processing performance of the material is deteriorated, and the production cost of the material is also increased

[0006] Furthermore, of the two fabrication methods, AgSnO 2 The electrical properties such as large contact resistance, high temperature rise, and large electrical wear and processing performance have always plagued the material manufacturing industry.