Effects of cold isostatic pressing and granule size distribution on the densification of alumina ceramics

Lidija Ćurković; Marijana Majić Renjo; Damir Ciglar

doi:10.3139/120.110739

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Effects of cold isostatic pressing and granule size distribution on the densification of alumina ceramics

Lidija Ćurković , Marijana Majić Renjo und Damir Ciglar

Veröffentlicht/Copyright: 15. Mai 2015

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Aus der Zeitschrift Materials Testing Band 57 Heft 6

Abstract

In this paper, alumina ceramics were compacted and shaped by cold isostatic pressing. This method provides high-density green compacts, uniformly distributed over the volume, without large pores. Green bodies were sintered at a temperature of 1650 °C. Effects of spray dried granule size distribution and compaction pressure on the density of the green and sintered alumina were investigated. It was found that the density in the green and sintered state slightly increased with increasing compaction pressure and decreased with the increasing alumina granule size. The axial and radial shrinkage of ceramic samples ranged between 20 and 22 %.

Kurzfassung

In der diesem Beitrag zugrunde liegenden Studie wurden Aluminiumoxidkeramiken kompaktiert und mittels isostatischen Kaltpressens geformt. Dieses Verfahren ergibt hochverdichtete Presskörper, die eine einheitliche Verteilung und keine großen Poren aufweisen. Die Presskörper wurden bei einer Temperatur von 1650 °C gesintert. Es wurden die Auswirkungen der Größenverteilung des sprühgetrockneten Granulats und des Kompaktierungsdruckes auf die Dichte des grünen und des gesinterten Aluminiumoxids untersucht. Es stellte sich heraus, dass die Dichte der grünen und gesinterten Körper leicht mit erhöhtem Kompaktierungsdruck anstieg und mit steigender Aluminiumoxidgranulatgröße abfiel. Die achsiale und radiale Schrumpfung der Keramikproben betrug zwischen 20 und 22 %.

§Correspondence Address, Marijana Majić Renjo, Research assistant, Faculty of Mechanical Engineering and Naval Architecture, Department of Materials, University of Zagreb, Ivana Lučića 5, HR-10000 Zagreb, Croatia, E-mail: marijana.majic@fsb.hr

Lidija Ćurković, born 1966, graduated at the Faculty of Chemical Engineering and Technology University of Zagreb, Croatia in 1990. After graduation, she worked in the Department of Analytical Chemistry of the Faculty of Chemical Engineering and Technology, University of Zagreb. She acquired the Master's degree and the Doctor's degree at the Faculty of Chemical Engineering and Technology in Zagreb in 1995 and 1999, respectively. Since 2000, she has been working in the Department of Materials of the Faculty of Mechanical Engineering and Naval Architecture (FMENA), University of Zagreb. Currently, she is Full Professor and Head of the Laboratory for Chemical Analysis of Metals in the Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb. Her scientific work includes research in the field of material science and engineering, particularly ceramics and ceramic coatings.

Marijana Majić Renjo, born 1985, studied Mechanical Engineering at the Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Croatia, where she achieved Bachelor´s and Master's degree. She has been working as a research assistant/scientific novice at the same institution in the Department of Materials since 2010. Currently, she is a postgraduate student of materials science and engineering at the Faculty of Mechanical Engineering and Naval Architecture (FMENA). Her fields of interest are monolithic and composite oxide ceramics and ceramic coatings.

Damir Ciglar, born 1959, completed Mechanical Technical School and graduated at the Faculty of Mechanical Engineering and Naval Architecture (FMENA), University of Zagreb, Croatia in 1983. After graduation, he was employed at the FMENA Zagreb, Department of Technology, Chair of Machine Tools as a young assistant. He had an employment at “Rade Končar – Generatori” from 1988 to 1991. In March 1991, he returned to FMENA – Department of Technology, Chair of Machine Tools. Currently, he is Full Professor there. Since 2003, he has been Head of the Machine Tool Laboratory and Deputy Head of the Department of Technology since 2010. In 2012, he became Head of the Chair of Machine Tools and was re-elected to the position as Head of the Machine Tool Laboratory of FMENA. His scientific work includes research and development in the field of production engineering, particularly machine tool components and advanced machining systems and processes, investigation of workpiece machinability as well as high speed machining.

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Published Online: 2015-05-15

Published in Print: 2015-06-01

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https://doi.org/10.3139/120.110739