Particle-stabilized ultra-low density zirconia toughened alumina foams

Zirconia toughened alumina (ZTA) is one of the leading engineering ceramics; it is used in a wide range of components and products in applications for which high strength, high toughness, and high temperature stability are needed. The particle-stabilized direct foaming method has lately become a sub...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2013-11, Vol.33 (13-14), p.2559-2564
Main Authors: Ahmad, Rizwan, Ha, Jang-Hoon, Song, In-Hyuck
Format: Article
Language:English
Subjects:
Ceramic composites
Ceramics
Colloidal chemistry
Density
Foaming
Foams
Particle-stabilized foams
Porosity
Porous ceramics
Struts
Valeric acid
Zirconia toughened alumina
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Summary:Zirconia toughened alumina (ZTA) is one of the leading engineering ceramics; it is used in a wide range of components and products in applications for which high strength, high toughness, and high temperature stability are needed. The particle-stabilized direct foaming method has lately become a subject of particular interest. Nevertheless only a few studies on combining ZTA ceramics and particle-stabilized direct foaming have been reported. Therefore, in this study, ultra-low density ZTA foams having single strut wall thickness, cell size ranging from 80μm to 200μm, and above 90% porosity were successfully fabricated via the particle-stabilized direct foaming method. Valeric acid was used as particle surface modifier to render the particles partially hydrophobic, which stabilized the air/water interface of the ZTA foams. The sintered foams maintained compressive strength up to 8MPa with porosity of 90%.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2013.03.027