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Making alumina microcomponents from Al powder

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posted on 17.12.2012 by Jung-Sik Kim, Kyle Jiang, C.L. Falticeanu, G.J. Davies, Isaac T. Chang
Alumina microcomponents have distinguishing advantages over Si counterparts. However, the shrinkage of alumina, as high as 20%, makes it difficult to produce precision components that require a high tolerance. A new fabrication process is presented to greatly reduce the shrinkage. The process consists of forming an Al powdered component through sintering and transforming the Al powdered component into an alumina part. In this way, the shrinkage occurring in sintering the Al powder component will be compensated by the expansion occurred when Al transforms into alumina. The process involves producing micro-moulds, preparing metallic paste, filling the micro-moulds with the metallic paste, demoulding, sintering the green Al patterns and finally oxidising the sintered Al-based components to achieve alumina components. The process was proven successful. Characterization of the sintered alumina microcomponents has been undertaken, including SEM image analysis, density and scale measurements.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Aeronautical and Automotive Engineering

Citation

KIM, J-S. ... et al, 2007. Making alumina microcomponents from Al powder. IN: Progress in Powder Metallurgy. Proceedings of the 2006 Powder Metallurgy, World Congress & Exhibition (PM 2006), 24th-28th September 2006, Busan, Korea. Trans Tech Publications, vol. 2 pp. 1041-1044

Publisher

© Trans Tech Publications

Version

AM (Accepted Manuscript)

Publication date

2007

Notes

This is a conference paper. It was published in the series Materials Science Forum and the definitive version is available at: http://www.scientific.net/MSF.534-536.1041

ISBN

9780878494194

ISSN

1662-9752

Publisher version

Book series

Materials Science Forum;534-536

Language

en

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