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Making alumina microcomponents from Al powder
journal contribution
posted on 2012-12-17, 11:09 authored by Jung-Sik Kim, Kyle Jiang, C.L. Falticeanu, G.J. Davies, Isaac T. ChangAlumina 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. 1041-1044Publisher
© Trans Tech PublicationsVersion
- AM (Accepted Manuscript)
Publication date
2007Notes
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.534-536.1041ISBN
9780878494194ISSN
1662-9752Publisher version
Book series
Materials Science Forum;534-536Language
- en