The control of slurry rheology in the processing of reticulated porous ceramics

Zhu, Xiaofang; Jiang, Dongliang; Shi, Tan

doi:10.1016/s0025-5408(02)00674-8

Cited by 63 publications

(59 citation statements)

References 13 publications

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“…Therefore, the influence of the slurry composition on its rheological properties and the resulting template coating characteristics have been investigated for several ceramic materials employed in foam manufacturing. [9][10][11] Within the present radiographs. [14] This technique opens up the possibility of an analysis of the foam's porosity (total, open, closed), specific surface area and cell size or strut thickness distributions together with other morphological parameters and is widely used in the characterization of cellular materials.…”

Section: Introductionmentioning

confidence: 66%

Impact of Slurry Composition on Properties of Cellular Alumina: A Computed Tomographic Study

et al. 2017

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Fine-pored, 45 ppi (pores per linear inch) alumina foams are prepared from ceramic slurries with varying contents of additives (deflocculant, binder) and solid loading following a standardized procedure. Rheological key parameters (yield stress, high-shear viscosity) of the respective slurries are determined by approximation of the experimental flow curves with appropriate rheological models. The resulting ceramic foams are characterized by computed tomography (CT) followed by a morphometric analysis of the reconstruction volume data. The main scope of the work involves the development of a procedure to reliably define the binarization threshold during these morphometric calculations, which is based on the analysis of the differential course of the total porosity results from calculations performed at varying binarization threshold values ("differential thresholding"). A very good match of the CT porosity results with experimental data is achieved, despite the unfavorable CT voxel resolution to foam structure fineness relation. The CT evaluation results are finally correlated to the rheological properties of the respective slurries used in foam manufacturing. The dominant slurry composition parameters are the weight fraction of the ceramic powder and the binder concentration. Increasing binder and solid content result in an increased yield stress and viscosity of the respective dispersion and consequently in a decreased porosity and cell size of the finally manufactured cellular ceramic.

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Section: Introductionmentioning

confidence: 66%

Impact of Slurry Composition on Properties of Cellular Alumina: A Computed Tomographic Study

et al. 2017

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“…There are many reports on the variety of porous carbon, oxides, sulfides and metals prepared from various hard and soft templates. Moreover, porous ceramics with a different porous morphology and size distribution have been fabricated via different routes, such as burning out a polymeric sponge impregnated with a ceramic slurry, 7 solidstate sintering, 8 sol-gel process, 9 replica of a polymer foam by impregnation 10 and gel casting methods. 11 Because of the low oxidation resistance of carbon and the poor hydrothermal stability of porous silica materials, SiC with a high surface area has attracted considerable attention as a support material in the catalysis.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of SiC-Based Ceramic Microstructures from Preceramic Polymers with Sacrificial Templates and Lithographic Techniques-A Review

Yoon

Lee

Kim

2006

J. Ceram. Soc. Japan

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Review péÉÅá~ä fëëìÉ Äó dìÉëí bÇáíçêëW lêÖ~åáÅ-íç-fåçêÖ~åáÅ`çåîÉêëáçå mêçÅÉëë Ñçê mçäóãÉê-aÉêáîÉÇ`Éê~ãáÅë c~ÄêáÅ~íáçå çÑ pá`_~ëÉÇ`Éê~ãáÅ jáÅêçëíêìÅíìêÉë Ñêçã mêÉÅÉê~ãáÅ mçäóãÉêë ïáíÜ p~ÅêáÑáÅá~ä qÉãéä~íÉë~åÇ iáíÜçÖê~éÜáÅ qÉÅÜåáèìÉë-^oÉîáÉï Processes for fabricating ceramic microstructures are in demand for use in areas such as microreactors and MEMS that can be used in harsh environments requiring a high temperatures tolerance, corrosion resistance, as well as tribological properties. This review describes the manufacture of tailored porous SiC ceramic microstructures using sacrificial templates, the feasible applications of microporous structures and microchannels as a microreactor, and microfabrication of preceramic polymers using soft lithography and sterolithography. Macroporous and mesoporous SiC ceramic structures have been fabricated using various templates including packed silica sphere assemblies, porous carbon templates, and nanoporous silica structures. In addition, SiC nanotubes have also been obtained from an alumina membrane used as a template. These porous structures were generally obtained using a series of infiltration, curing and pyrolysis, and chemical or oxidative etching steps. Complicated SiC ceramic microfeatures were fabricated using near-net shape lithographic techniques to preceramic polymers. Line patterns and porous channels were produced by soft lithography, whereas the 3D woodpile structures were fabricated using stereolithography. These novel structures show great promises for use in high temperature micro-reactors for the on-demand reforming of higher hydrocarbons into hydrogen in portable power sources. It is expected that the integration of preceramic polymers into new economic manufacturing strategies such as precursor casting in templates and lithography utilization will be a break-through technology for the creation of complex ceramic nanostructures.

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“…Rheology and adherence on the polymeric foam of the impregnating suspension are the most crucial points in the ceramic replication technique 13 . In order to achieve the adherence of the ceramic slurry on polyurethane fibers, a pre-treatment was necessary. )…”

Section: Methodsmentioning

confidence: 99%

Experience on a Low Cost Way to Obtainal-Ti Ceramic Foams

2015

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An experience on a simple process for producing alumina-rutile-mullite ceramic foams by using aqueous particulate slurries is proposed. The sintering process is achieved in one unique thermal process at 1200 ºC in air. The description of the process, physical properties and morphological studies are reported. Microstructure is studied by using confocal optical microscopic technique. The highly active porous foam structure of this ceramic material produced according to the low-cost process presented here could extend its use in a broad range of applications, such as catalytic, biomedical scaffolds, filtering, etc.

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The control of slurry rheology in the processing of reticulated porous ceramics

Cited by 63 publications

References 13 publications

Impact of Slurry Composition on Properties of Cellular Alumina: A Computed Tomographic Study

Impact of Slurry Composition on Properties of Cellular Alumina: A Computed Tomographic Study

Fabrication of SiC-Based Ceramic Microstructures from Preceramic Polymers with Sacrificial Templates and Lithographic Techniques-A Review

Experience on a Low Cost Way to Obtainal-Ti Ceramic Foams

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