Preparation method of silver clad aluminum composite filament

Abstract

A preparation method of a silver clad aluminum composite filament includes 1), selecting an aluminum core and a silver tube in transition fit with the external diameter of the aluminum core, subjecting metal surfaces to deoiling and oxidation film removal, drying and assembling the aluminum core and the silver tube, and sealing two ends of the assembled aluminum core and the silver tube by means of local plastic deformation; 2), subjecting an assembled composite rod to induction heating, and drawing the heated composite rod to form the phi 1-2 mm silver clad aluminum composite filament; 3), when cold deformation is about 95-99% of section shrinkage rate, subjecting the composite filament to annealing treatment at 200-400 DEG C for 0.1-0.5 hour; 4), drawing the silver clad aluminum filament into a phi 0.05-0.5 mm filament under the action of ultrasonic vibration, wherein kerosene or lubricating oil serves as a lubricant, oil temperature ranges from 150 DEG C to 250 DEG C, and vibration frequency of ultrasonic waves is 10-50 Hz.

Description

technical field [0001] The invention relates to a method for preparing a bimetallic composite microfilament, in particular to a method for preparing a silver-clad aluminum composite filament with a circular cross section. Background technique [0002] With the rapid development of electronic information technology, electronic precision instruments and sensors are becoming more and more miniaturized and high-precision, which puts forward higher requirements for the wires used for signal transmission. As the metal with the highest conductivity, silver has a wide range of applications in microelectronics. However, due to the lack of silver resources, the cost of directly using silver wire as a conductive material is high, which is not conducive to its popularization and application. Composite wire has superior performance that cannot be achieved by a single material, and is widely used in various industries. Silver-clad aluminum composite filaments are widely used in high-per...

AI Technical Summary

Problems solved by technology

The existing silver-clad aluminum filament preparation methods mainly include hydrostatic extrusion→drawing method (Xie Jianxin, et al.: A high-performance silver-clad aluminum composite wire and its preparation process [P], Chinese patent, Invention patent, patent number: CN200710063256.6, 2007.01.05), the preparation cost of the composite billet produced by this method is relatively high, and due to the large yield strength ratio of silver / aluminum, during hydrostatic extrusion, the silver-coated metal Deformation is difficult, and the metal flow of the silver layer is relatively slow compared to the core layer aluminum, resulting in the cladding silver layer being prone to bamboo-shaped fracture defects