Processing of cellular ceramics by foaming and in situ polymerisation of organic monomers

This paper describes studies on a new processing route for fabricating highly porous ceramics. The method is based on the generation of a foam from an aqueous suspension of ceramic powder and the subsequent stabilisation of the structure by in situ polymerisation of organic monomers. The influence o...

Full description

Saved in:
Bibliographic Details
Published inJournal of the European Ceramic Society Vol. 19; no. 12; pp. 2059 - 2066
Main Authors Sepulveda, P, Binner, J.G.P
Format Journal Article
LanguageEnglish
Published Oxford Elsevier Ltd 01.01.1999
Elsevier
Subjects
Al 2O 3
Applied sciences
Building materials. Ceramics. Glasses
cellular ceramics
Ceramic industries
Chemical industry and chemicals
Exact sciences and technology
Miscellaneous
porosity
strength
Technical ceramics
cellular ceramics
strength
porosity
Al 2O 3
Foaming
In situ
Polymerization
Mechanical properties
Cellular material
Particle suspension
Experimental study
Porous material
Oxide ceramics
Acrylates
Additive
Sintering
Manufacturing
Monomer
Alumina
Rheological properties
Online AccessGet full text

Cover

More Information
Summary:This paper describes studies on a new processing route for fabricating highly porous ceramics. The method is based on the generation of a foam from an aqueous suspension of ceramic powder and the subsequent stabilisation of the structure by in situ polymerisation of organic monomers. The influence of the slip viscosity on the foam volume and stability was determined using concentrated alumina suspensions containing dispersing agents and two commercial foaming agents. The in situ polymerisation of organic monomers led to fast solidification, resulting in strong, porous bodies which could withstand machining. The resulting ceramic foams consisted of a highly interconnected network of spherical cells with densities as low as 6% of theoretical. The distribution of cell size was dependent both on the density of the specimen produced and on the time for polymerisation onset. The size ranged from approximately 30 to 600 μm. Enlargement of cell size to achieve materials of higher permeability was possible through expansion of the foam via pressure reduction before polymerisation. The creation of highly densified struts between the cells led to flexural strengths as high as 26 MPa. ©
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0955-2219
1873-619X
DOI:10.1016/S0955-2219(99)00024-2