Preparation method for tin-bismuth series alloy temperature fuse material with high plasticity

Abstract

The invention discloses a preparation method for a tin-bismuth series alloy temperature fuse material with high plasticity. The method is characterized by comprising the following steps of: preparing an equal channel angular extrusion blank ingot by using a tin-bismuth alloy cast ingot, pre-heating the blank ingot and preserving the temperature of the blank ingot; performing isothermal extrusion on the equal channel angular extrusion blank ingot with an equal channel angular extrusion die to prepare an extrusion blank; preparing a drawing blank meeting a drawing molding requirement; and performing isothermal drawing on the drawing blank with a water-cooling temperature-controlled wire drawing machine to prepare the temperature fuse material and performing coil packaging. The fuse material prepared by the method is high in strength and plasticity, and has fine crystal particles and more uniform component organization. Various requirements on packaging of temperature fuses can be met. The method is simple and high in operability and is an ideal method for producing the tin-bismuth series alloy temperature fuse material.

Description

technical field [0001] The invention relates to a material preparation method, in particular to a preparation method of a high plasticity tin-bismuth alloy temperature fuse material. Background technique [0002] Thermal fuses are essential safety protection components for electronic equipment and circuits, and are widely used in various home appliances, office equipment, communication equipment, and audio-visual equipment. When the working current of electronic equipment is normal, when the ambient temperature of the equipment or circuit rises to a certain abnormal value, the thermal fuse (fusible alloy) will immediately fuse and cut off the circuit to protect the equipment and circuit and alarm. At the same time, with the miniaturization and portability of electronic equipment, the demand for thermal fuses with smaller diameters will increase in the future, especially for thermal fuses with a diameter below 0.4mm. Traditional thermal fuse alloys are binary or multi-elemen...

AI Technical Summary

Problems solved by technology

However, the wire prepared by this method has a cast structure, and the grains of the bismuth-rich phase are coarse and distributed in layers, which cannot change the hard and brittle characteristics of the alloy. The prepared wire has high brittleness and insufficient ductility, and cannot be further processed into a smaller diameter. wire, or coiled, can only provide a short length of straight material, unable to prepare continuous wire that meets the requirements of use and packaging

[0005] Chinese patent CN101362265 discloses a method of making tin wire for welding materials, which is to use high plasticity pure tin or tin alloy as a wire drawing blank, and press solder paste made of high bismuth content alloy powder into the wire drawing blank and draw it into a wire. It is made of pure tin or tin alloy on the surface and solder paste on the core. The alloy solder wire prepared by this method is a combination of the physical shape of the two component alloys. The melting point of the core paste alloy is the same as that of the outer layer of pure tin or Tin alloy components have different melting points, so they can only be used as welding materials, not thermal fuses