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The Fabrication of Electronic Packages from High Silicon Aluminium Alloys Using Thin Shell Electroformed (TSE) EDM Electrodes

Rennie, Allan E. W. and Bennett, G. and Bocking, C. and Jacobson, D. (2002) The Fabrication of Electronic Packages from High Silicon Aluminium Alloys Using Thin Shell Electroformed (TSE) EDM Electrodes. Transactions of the Institute of Metal Finishing, 80 (3). pp. 92-96. ISSN 0020-2967

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Abstract

Metal Matrix Composite (MMC) materials are finding increasing use within the electronics packaging industry due to their excellent coefficient of thermal expansion (CTE), stiffness and thermal management properties. Unfortunately, these composites are not easily electroplated due to the nonconducting phases that make up a high proportion of the surface. Such limitations can be overcome by utilising a spray formed aluminium/silicon alloy which can be compositionally modulated to achieve thermal matching to the electronic materials currently in use. This group of alloys, manufactured by Osprey Metals and known as the CE alloys, may be easily electroplated. These alloys can be fabricated readily into electronic packages by conventional machining with tungsten carbide or polycrystalline diamond (PCD) tools and electro-discharge machining (EDM). Generally more than one of these conventional machining operations is required in the fabrication process. A new and much faster method has been developed which has been used to produce complete electronic packages from plates of Si-Al alloys in a single machining step. In this novel method, known as Thin Shell Electroforming (TSE), an accurate model of the package is produced directly from the drawing in wax using a 3D Systems ThermoJet Modeller This model is mounted into a frame and it is then plated with a thin copper electroform. The wax model is then melted leaving the electroform attached to the frame. This is back-filled with solder and used as the EDM tool for machining the package from a plate of Si-Al alloy This paper describes the process of TSE and its application to electronic packages.

Item Type: Article
Journal or Publication Title: Transactions of the Institute of Metal Finishing
Additional Information: This paper was fundamental in establishing the integration of rapid prototyping and electroforming for the accurate machining of metal matrix composite (MMC) materials especially for electronic packaging applications (due to the excellent coefficient of thermal expansion, stiffness and thermal management properties of MMC). Originally presented at the EAST Conference ""Electrodeposition in Electronics"", Chalkidiki-Ouranoupolis, Greece, it was requested that it be republished by the Institute of Metal Finishing in this Journal. Awarded the Westinghouse Prize (sponsored by Riley Industries Ltd) in 2003 by the Institute of Metal Finishing in view of the commercial viability of the process. RAE_import_type : Journal article RAE_uoa_type : General Engineering
Uncontrolled Keywords: Electroforming ; Rapid Prototyping ; Electro-Discharge Machining ; Electronic Packaging ; EDM Electrodes
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Departments: Faculty of Science and Technology > Engineering
ID Code: 2682
Deposited By: ep_importer
Deposited On: 27 Mar 2008 09:40
Refereed?: Yes
Published?: Published
Last Modified: 24 Jan 2014 05:17
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/2682

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