Table of Contents
Journal of Metallurgy
Volume 2009, Article ID 853092, 4 pages
Research Article

Machinable Cu-40 % Zn Composites Containing Graphite Particles by Powder Metallurgy Process

1Joining and Welding Research Institute, Osaka University, 11-1 Mihogaoka, Ibaragi, Osaka 567-0047, Japan
2Development and engineering division, SAN-ETSU METAL Co. Ltd, 1892 Ota, Tonami, Toyama 939-1315, Japan

Received 29 December 2008; Accepted 11 March 2009

Academic Editor: Ludo Froyen

Copyright © 2009 Katsuyoshi Kondoh et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Advanced Cu-40mass%Zn alloys with a high tensile strength and excellent machinability have been developed via a powder metallurgy (P/M) process. They are environmentally benign because fine graphite particles are included instead of lead (Pb) to improve their machinability. The effect of the content and particle size of the graphite on the mechanical properties and machinability are investigated in this paper. When applying a conventional P/M process consisting of the cold compaction and hot extrusion to consolidate elementally premixed mixture of Cu-40mass%Zn and graphite powder, the addition of 1 mass% graphite particles with 5 1 0 𝜇 m in diameter is suitable to obtain a high tensile strength and good machinability at the same time.