Processing of Porous Oxide Ceramics

Hirschfeld, Deidre A.; Li, T. K.; LIu, Dean-Mo

doi:10.4028/www.scientific.net/kem.115.65

Cited by 49 publications

(44 citation statements)

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“…[15,20,21] described in recent reviews. [1,2] Of particular interest are Methods based on the foaming of aqueous polyurethane the mechanical properties that closed cell foams offer for systems have been tested, [22] and the use of conventional ultralight structures and for impact absorption.…”

Section: Introductionmentioning

confidence: 99%

Preparation of high porosity metal foams

Jee

Özgüven

Guo

et al. 2000

Metall Mater Trans B

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Metal foams with porosities greater than 90 pct were prepared by a novel powder metallurgy route using a polymeric vehicle. Coarse titanium powder and fine carbonyl iron powder were tested. The powders were blended with each component of a two-part polyol-isocyanate foaming system, and the resulting suspensions were mixed and allowed to expand. Although the resulting polymer-metal foam was closed cell, particles were not retained in the windows. Upon pyrolysis to remove the resin, the windows opened and the final sintered metal foam was reticulated. Such foams present very low sintered density and are correspondingly weak after sintering but offer a fine reticulated structure with cell diameters in the region of 100 to 200 m. They may have applications in the areas of catalysis, biomaterials, and composites.

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Section: Introductionmentioning

confidence: 99%

Preparation of high porosity metal foams

Jee

Özgüven

Guo

et al. 2000

Metall Mater Trans B

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“…7 A range of techniques for ceramic processing based mainly on aqueous media and known collectively as`g elcasting'' 3,8,9 can also be applied to the preparation of ceramic foams. The increase in viscosity which allows shape to be retained in these processes is generally achieved by changes of pH or of temperature.…”

Section: Introductionmentioning

confidence: 99%

Microstructure of ceramic foams

Peng

Fan

Evans

et al. 2000

Journal of the European Ceramic Society

183

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This paper describes the preparation of ceramic foams by expansion of a ceramic suspension based on a polyurethane system. The microstructure and degree of reticulation of the foamed ceramic were examined and analysed with the help of a simple geometrical model. Like the porous ceramics prepared by the replica processing method, these foamed ceramics possess open cells in a nearly equiaxed shape but the cell size is much ®ner. The ratio of the window size to the cell size is a useful parameter for characterising the geometry of the foam and is related to the qualitative concept of degree of reticulation. For a face centred cubic array of cells it is related geometrically to the volume fraction of porosity and this relationship is tested using microstructural measurements for a range of ceramic foams. #

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“…ZnO [19]. The pore structures combine large and small pores, and it can be controlled by the content of the polymer powders to realize the precise control of the permeability of the final products.…”

Section: Addition Of Pore-forming Materials In Powdersmentioning

confidence: 99%

“…The preprocessed raw material powders are placed in the mold and then heated to 900-1,000 C. Under the pressurizing conditions and in the oxidizing atmosphere, the powders bond together, the released gas from the foaming agents fills the mold, and finally, porous ceramics were obtained after cooling. Traditionally, the shaped preformed material was made by mixing calcium carbonate and ceramic powders, and then sintering to form pores with the released CO/CO 2 gases [19]. This kind of porous product has many industrial applications, and the economical way to obtain such material is to mix the ceramic powders with camphor and a plasticizer.…”

Section: Green Body Foamingmentioning

confidence: 99%