The Experts below are selected from a list of 8586 Experts worldwide ranked by ideXlab platform

J M F Ferreira - One of the best experts on this subject based on the ideXlab platform.

  • processing of Porous Ceramics by starch consolidation
    Journal of The European Ceramic Society, 1998
    Co-Authors: O Lyckfeldt, J M F Ferreira
    Abstract:

    Abstract A new consolidation method for forming Porous Ceramics was developed using starch as both consolidator/binder and pore former. Simple and complex-shaped components of Porous alumina were shaped and demoulded in wet state. After drying, burn-out and sintering, materials with ultimate porosities between 23 and 70% were obtained. The overall pore structures were dominated by the large spherically shaped pores (10–80 μm) left by the starch partides. Furthermore, the average size of the small pores connecting the large pores, measured by Hg porosimetry, was controlled by the total solids loading and starch content in the originally prepared slips and varied between 0.5 and 9.5 μm. Chemically modified starch was found to give better dimensional control and regularity regarding average size of the connecting pores than native starch owing to more stable properties during water processing. This new forming technique can be used in the manufacture of various Porous Ceramics for thermal insulation applications, as filters/membranes and gas burners, or as bioCeramics. Major advantages are the simplicity of the process, the possibilities of forming complex shapes using various mould materials and the lowcost processing equipment/materials needed.

Shuzo Kanzaki - One of the best experts on this subject based on the ideXlab platform.

  • Synthesis of Porous Ceramics with Complex Pore Structure by Freeze-Dry Processing
    Journal of the American Ceramic Society, 2001
    Co-Authors: Takayuki Fukasawa, Motohide Ando, Tatsuki Ohji, Shuzo Kanzaki
    Abstract:

    Porous Ceramics with complex pore structure were synthesized by a freeze-dry process. Freezing-in of a water-based Ceramics slurry was done while controlling the growth direction of the ice. Sublimation marks of the ice were generated by drying under reduced pressure. Porous Ceramics having a complex pore structure were obtained by sintering the green body: aligned macroscopic open pores contained micropores in their internal walls. The pore structure was substantially affected by the starting slurry concentration and sintering temperature. The pore formation mechanism is discussed in relation to these effects.

Tatsuki Ohji - One of the best experts on this subject based on the ideXlab platform.

  • macro Porous Ceramics processing and properties
    International Materials Reviews, 2012
    Co-Authors: Tatsuki Ohji, Manabu Fukushima
    Abstract:

    AbstractPorous Ceramics are now expected to be used for a wide variety of industrial applications from filtration, absorption, catalysts and catalyst supports to lightweight structural components. During the last decade, tremendous efforts have been devoted for the researches on innovative processing technologies of Porous Ceramics, resulting in better control of the Porous structures and substantial improvements of the properties. This article intends to review these recent progresses of Porous Ceramics. Because of a vast amount of research works reported in this field these days, the review mainly focuses on macro-Porous Ceramics whose pore size is larger than 50 nm. Followed by giving a general classification of Porous Ceramics, a number of innovative processing routes developed for critical control of pores are described, along with some important properties. The processes are divided into four categories including (i) partial sintering, (ii) sacrificial fugitives, (iii) replica templates and (iv) dir...

  • Reinforcement by crack-tip blunting in Porous Ceramics
    Journal of The European Ceramic Society, 2004
    Co-Authors: Zhen-yan Deng, Tatsuki Ohji, Yoshiaki Inagaki, Jianfeng Yang, Yoshihisa Tanaka
    Abstract:

    A crack-tip blunting mechanism in Porous Ceramics was identified in this study. The reinforcement by crack tip blunting in Porous Ceramics was analyzed quantitatively, based on a grain fracture model. The investigation revealed that the crack tip blunting increases the fracture toughness of Porous Ceramics, depending on pore morphology and grain arrangement. The theoretical predictions were in good agreement with the experimental results.

  • Synthesis of Porous Ceramics with Complex Pore Structure by Freeze-Dry Processing
    Journal of the American Ceramic Society, 2001
    Co-Authors: Takayuki Fukasawa, Motohide Ando, Tatsuki Ohji, Shuzo Kanzaki
    Abstract:

    Porous Ceramics with complex pore structure were synthesized by a freeze-dry process. Freezing-in of a water-based Ceramics slurry was done while controlling the growth direction of the ice. Sublimation marks of the ice were generated by drying under reduced pressure. Porous Ceramics having a complex pore structure were obtained by sintering the green body: aligned macroscopic open pores contained micropores in their internal walls. The pore structure was substantially affected by the starting slurry concentration and sintering temperature. The pore formation mechanism is discussed in relation to these effects.

O Lyckfeldt - One of the best experts on this subject based on the ideXlab platform.

  • processing of Porous Ceramics by starch consolidation
    Journal of The European Ceramic Society, 1998
    Co-Authors: O Lyckfeldt, J M F Ferreira
    Abstract:

    Abstract A new consolidation method for forming Porous Ceramics was developed using starch as both consolidator/binder and pore former. Simple and complex-shaped components of Porous alumina were shaped and demoulded in wet state. After drying, burn-out and sintering, materials with ultimate porosities between 23 and 70% were obtained. The overall pore structures were dominated by the large spherically shaped pores (10–80 μm) left by the starch partides. Furthermore, the average size of the small pores connecting the large pores, measured by Hg porosimetry, was controlled by the total solids loading and starch content in the originally prepared slips and varied between 0.5 and 9.5 μm. Chemically modified starch was found to give better dimensional control and regularity regarding average size of the connecting pores than native starch owing to more stable properties during water processing. This new forming technique can be used in the manufacture of various Porous Ceramics for thermal insulation applications, as filters/membranes and gas burners, or as bioCeramics. Major advantages are the simplicity of the process, the possibilities of forming complex shapes using various mould materials and the lowcost processing equipment/materials needed.

Takayuki Fukasawa - One of the best experts on this subject based on the ideXlab platform.

  • Synthesis of Porous Ceramics with Complex Pore Structure by Freeze-Dry Processing
    Journal of the American Ceramic Society, 2001
    Co-Authors: Takayuki Fukasawa, Motohide Ando, Tatsuki Ohji, Shuzo Kanzaki
    Abstract:

    Porous Ceramics with complex pore structure were synthesized by a freeze-dry process. Freezing-in of a water-based Ceramics slurry was done while controlling the growth direction of the ice. Sublimation marks of the ice were generated by drying under reduced pressure. Porous Ceramics having a complex pore structure were obtained by sintering the green body: aligned macroscopic open pores contained micropores in their internal walls. The pore structure was substantially affected by the starting slurry concentration and sintering temperature. The pore formation mechanism is discussed in relation to these effects.