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Colloidal processing, surface characterization, and sintering of nano ZrO2 powders

Published online by Cambridge University Press:  03 March 2011

Cihangir Duran ,
Yu Jia ,
Yuji Hotta ,
Kimiyasu Sato  and
Koji Watari
Cihangir Duran
Affiliation:
National Institute of Advanced Industrial Science and Technology, Advanced Sintering Technology Group, Advanced Manufacturing Research Institute, Anagahora 2266-98, Shimoshidami, Moriyama-ku, Nagoya, 463-8560, Japan; and Gebze Institute of Technology, Department of Materials Science and Engineering, 41400, Gebze, Kocaeli, Turkey
Yu Jia
Affiliation:
National Institute of Advanced Industrial Science and Technology, Advanced Sintering Technology Group, Advanced Manufacturing Research Institute, Anagahora 2266-98, Shimoshidami, Moriyama-ku, Nagoya, 463-8560, Japan
Yuji Hotta*
Affiliation:
National Institute of Advanced Industrial Science and Technology, Advanced Sintering Technology Group, Advanced Manufacturing Research Institute, Anagahora 2266-98, Shimoshidami, Moriyama-ku, Nagoya, 463-8560, Japan
Kimiyasu Sato
Affiliation:
National Institute of Advanced Industrial Science and Technology, Advanced Sintering Technology Group, Advanced Manufacturing Research Institute, Anagahora 2266-98, Shimoshidami, Moriyama-ku, Nagoya, 463-8560, Japan
Koji Watari
Affiliation:
National Institute of Advanced Industrial Science and Technology, Advanced Sintering Technology Group, Advanced Manufacturing Research Institute, Anagahora 2266-98, Shimoshidami, Moriyama-ku, Nagoya, 463-8560, Japan
*
a)Address all correspondence to this author. e-mail: y-hotta@aist.go.jp
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Abstract

Colloidally stable suspensions are required to fabricate dense samples with uniform microstructure by colloidal processing methods, which necessitate dispersion of ceramic powders in a liquid medium. Aqueous nano ZrO2 suspensions were prepared using polyethylenimine (PEI) as a dispersant. PEI adsorption on nano ZrO2 surfaces was promoted with increasing initial PEI content and suspension pH. Isoelectric point was shifted from pH 7 at 0 wt% PEI to pH 10.4 at 3 wt% PEI. Stable suspensions had mean particle sizes in the range of 100 to 150 nm and sedimentation rates less than0.4 mm/h, as compared to 2–5.5 μm and 10–50 mm/h for unstable suspensions. Samples with 98% relative density were fabricated after sintering at 1300 °C for 4 h from colloidally stable suspensions.

Keywords

AdsorptionColloidalNanoparticle
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 5 , May 2005 , pp. 1348 - 1355
Copyright
Copyright © Materials Research Society 2005

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