Preparation method for silver-iron-rhenium electric contact material

Abstract

The invention discloses a preparation method for a silver-iron-rhenium electric contact material. The preparation method is characterized by comprising the following specific steps that a, powder is mixed; b, roasting is conducted; c, reduction is conducted; d, ball-milling and sieving are conducted; e, powder is mixed, 320 meshes of 99.99% silver powder and 200 meshes of iron-rhenium alloy powder are mixed through a ploughing blade type powder mixing machine; f, isostatic pressing is conducted, an oil medium is subjected to cold isostatic pressing molding, the working pressure is 160-180 MPa, the pressure maintaining time is 90-120 seconds, and the size of a molded bar ingot is phi90x400 mm; g, sintering is conducted at the temperature of 800-850 DEG C, and ammonia dissociation gas protection is conducted; h, extrusion is conducted through a 880 ton extruding machine to obtain the required specification; i, rolling is conducted, a phi250 two-roll mill is adopted, and the thickness deformation quantity of a strip material is smaller than 80%; j, annealing is conducted, the temperature is 550-650 DEG C, ammonia dissociation gas protection is conducted for 1-2 hours; k, finish rolling is conducted, a phi60x240 / 250 four-roll mill is adopted, and the thickness deformation quantity of the strip material is smaller than 70%; and l, strip splitting is conducted to reach the required size of a precious metal layer of the silver copper composite strip material.

Description

technical field [0001] The invention relates to a preparation method of an electrical contact material, in particular to a preparation method of a silver-iron-rhenium electrical contact material. Background technique [0002] As we all know, electrical contact refers to a physical and chemical phenomenon in which two conductors contact each other and realize current transmission or signal transmission through the contact interface. The two conductors that pass current or carry signals are called contacts or contacts. With the continuous development of science and technology and industrial automation, the output and variety of relays, contactors and switches have increased significantly, and subsequently, the demand for electrical contacts has increased in quantity and quality. [0003] Electrical contacts are the core components of switching appliances, and are the key factors that affect the on-off conversion capability and reliability of switching appliances such as vario...

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Problems solved by technology

[0006] However, the melting point of metal rhenium is 3186°C, the melting point of iron is 1535°C, and the boiling point is 2750°C, and the melting point of silver is 960°C, and the boiling point is 2213°C. Since the melting point of rhenium is higher than the boiling point of iron and silver, silver-iron-rhenium alloys cannot be realized through smelting processes. , and because silver and iron are incompatible with each other, it is difficult to produce silver-iron-rhenium alloys to achieve the addition of a small amount of metal rhenium to improve the hardness of the contact material, enhance the welding resistance and wear resistance of the contact material, and prolong the service life the goal of