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Title: Making alumina microcomponents from Al powder
Authors: Kim, Jung-Sik
Jiang, Kyle
Falticeanu, C.L.
Davies, G.J.
Chang, Isaac T.
Keywords: Alumina microcomponent
Micro moulds
Ultra-fine Al powder
Issue Date: 2007
Publisher: © Trans Tech Publications
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
Series/Report no.: Materials Science Forum;534-536
Abstract: 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.
Description: 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
Version: Accepted for publication
DOI: 10.4028/www.scientific.net/MSF.534-536.1041
URI: https://dspace.lboro.ac.uk/2134/11223
Publisher Link: http://www.scientific.net
ISBN: 9780878494194
ISSN: 1662-9752
Appears in Collections:Conference Papers and Presentations (Aeronautical and Automotive Engineering)

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