Effects of Processing Parameters on the Fabrication of Copper Cladding Aluminum Rods by Horizontal Core-Filling Continuo
- PDF / 973,510 Bytes
- 10 Pages / 593.972 x 792 pts Page_size
- 38 Downloads / 147 Views
ON
COPPER has been used widely as an electrical material because of its excellent conductivity. However, because of the worldwide resource shortage and the large price fluctuation of copper, aluminum was adopted as an alternative material in the electric field since the 1950s for its relative abundant resource, lower price than that of copper, and good conductivity. But the poor reliability of the connection between aluminum conductors or between an aluminum conductor and a copper conductor restricted the wide application of the aluminum conductor. From the 1960s, a copper cladding aluminum (CCA) bimetallic laminar composite was developed as an ideal substitute for copper conductor and pure aluminum conductor because of its YA-JUN SU, PhD Student, XIN-HUA LIU and HAI-YOU HUANG, Lecturers, XUE-FENG LIU and JIAN-XIN XIE, Professors, are with the Key Laboratory of Advanced Materials Processing (MOE), University of Science and Technology Beijing, Beijing 100083, P.R. China. Contact e-mail: [email protected] CHUN-JING WU, Professor, is with the School of Materials Science and Engineering, University of Science and Technology Beijing. Manuscript submitted May 2, 2010. Article published online November 5, 2010. 104—VOLUME 42B, FEBRUARY 2011
outstanding comprehensive performances, for example, low density, high conductivity, excellent corrosion resistance, and good brazing property. It has been used widely in the fields of signal transportation, power transmission, special electromagnetic wire, etc.[1–5] With the application of CCA in industry, more and more scientists and engineers have become interested in the development of the fabricating technologies of CCA wire. Several methods have been used to a produce a bar with a compound structure. So far, there are two categories of fabrication technologies of the CCA compound structure. The first one is solid–solid bonding technology, such as the corolling[6] method, and the overlay welding[7–9] method, which has been used to fabricate CCA wire for industrial production. The interface between copper and aluminum is formed based on mechanical contact and diffusion bonding. Therefore, both of these methods have some shortages, such as long process flow, high production costs, serious environmental issues during surface treatment, and difficulty in preparing composite conductors with the heteromorphic or large cross sections, e.g., a flat bus used for large electric current transmission. The second category of technology is solid–liquid bonding. Webber and Drescher[10] invented a method of METALLURGICAL AND MATERIALS TRANSACTIONS B
producing a nonferrous type of clad metallic product in lengths of desired size and, if desired, in continuous lengths. The advantage of the method is that a clad metallic product in continuous lengths can be fabricated easily. However, a critical problem to these methods is the partial oxidation on the interior surface of the cladding metal. An oxide layer located between the cladding and core metals severely affects the interface strength and physical
Data Loading...
