Fabrication of Macroporous Alumina with Tailored Porosity

Tang, Fang‐Fang; Fudouzi, Hiroshi; Sakka, Yoshio

doi:10.1111/j.1151-2916.2003.tb03607.x

Cited by 91 publications

(70 citation statements)

References 18 publications

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“…The textured porous aalumina bodies were prepared by the slip casting of welldispersed aalumina suspensions followed by heating at 1073 K. The relative density of the calcined bo Special Issue ''Innovative Ceramics (I)'' dies without polymer addition was 60.7÷, but that with the polymer addition 61) decreased to 55÷. Figure 23 shows the XRD patterns of the infiltrated porous bodies initially with and without polymer addition and reaction sintering at 1973 K. The sample was confirmed to be balumina by the reaction of aalumina and Na 2 O, but aalumina did remain when the polymer particle was not added to alumina, but when the polymer was added, the residual aalumina decreases.…”

Section: Process Factors and Microstructure Controlmentioning

confidence: 99%

Textured Development of Feeble Magnetic Ceramics by Colloidal Processing Under High Magnetic Field

Sakka

Suzuki

2005

J. Ceram. Soc. Japan

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226

141

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The controlled development of texture is one of the ways for effectively improving physical and mechanical properties. In this review paper, we introduce a new processing of textured ceramics with a feeble magnetic sus ceptibility by slip casting in a high magnetic field and subsequent heating. As an example of feeble magnetic ceramics, we demonstrate the fabrication of textured alumina in details. The susceptibility of diamagnetic aalu mina is very small, but the orientation energy of the alumina particle by a high magnetic field becomes greater than the thermal energy. aAlumina with a rhombohedral structure shows anisotropic susceptibility, but this anisotropy has up to now been more or less ignored due to its very low value. However, in a high magnetic field, the energy of crystal anisotropy becomes comparable to or greater than the energy of thermal motion. The degree of orientation depends on the processing factors, such as heating temperature, particle size, applied magnetic field, concentration of the suspension, etc. This process technique confers several advantages and it is possible for this type of processing to be applied to other noncubic ceramics, such as TiO 2 , ZnO, SnO, hydrooxy apatite (HAP), AlN, SiC, Si 3 N 4 , etc.

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Section: Process Factors and Microstructure Controlmentioning

confidence: 99%

Textured Development of Feeble Magnetic Ceramics by Colloidal Processing Under High Magnetic Field

Sakka

Suzuki

2005

J. Ceram. Soc. Japan

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226

141

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“…5 (indicated by dotted lines) shows that they intersect in the region of 2 g/cm 3 , indicating the possibility of a non-shrink ceramics.…”

Section: Resultsmentioning

confidence: 99%

“…Extrapolation of these curves showed that they intersect with the values of density of about 2 g/cm 3 , which indicates the possibility of producing non-shrink ceramics.…”

Section: Discussionmentioning

confidence: 99%

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Structures and properties of alumina-based ceramic for reconstructive oncology

Grigoriev¹,

Кулъков²

2016

AIP Conference Proceedings

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Abstract. The microstructure of alumina ceramics based on powders with a varying grain size has been investigated. Both commercial alumina powders and those fabricated by denitration of aluminum salts in high-frequency discharge plasma were used. It is shown that the variation of the sintering temperature and morphology of the initial powders of the particles leads to a change of the pore structure of ceramics from pore isolated clusters to a structure consisting of a ceramic skeleton and a large pore space. Changing the type of pore structure occurs at about 50% of porosity. The ceramic pore size distribution is bimodal. Dependencies final density vs initial density are linear; at the same time with increasing temperature, inclination of changes from positive to negative, indicating the change of sealing mechanisms. Extrapolation of these curves showed that they intersect with the values of density of about 2 g/cm 3 , which indicates the possibility of producing non-shrink ceramics. It is shown that the strength increases with increasing nanocrystalline alumina content in powder mixture. A change in the character the pore structure is accompanied by a sharp decrease in strength, which corresponds to the percolation transition in ceramics. These results showed that it is possible to obtain ceramic materials with the structure and properties similar to natural bone.

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“…These macroporous ceramic coating layer also requires control of pore sizes, shapes and pore size distributions in order to design preferred physical and chemical properties, such as size effect, electric affinity. [2][3][4][5][6][7][8] Recently, porous ceramic materials with highly controlled macroporous structures have been prepared by a colloidal crystal templating technique using some monodisperse microspheres such as polystyrene, poly methyl methacrylate, and silica. [2][3][4][5][6][7][8] However, it is difficult to obtain porous materials with well-ordered macroporous structure onto a solid substrate for short fabrication time.…”

Section: Introductionmentioning

confidence: 99%

Macroporous Hydroxyapatite Ceramic Coating by Using Electrophoretic Deposition and Then Heat Treatment

Hamagami

Ato

Kanamura

2006

J. Ceram. Soc. Japan

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A macroporous hydroxyapatite ceramic coating was fabricated on a titanium substrate by an electrophoretic deposition EPD process followed by a heat treatment in order to obtain high performance bioactive porous hydroxyapatite. The key of this EPD process is a formation of composite particles by using a heterocoaguration reaction, consisting of hydroxyapatite ceramic nanoparticles for the ceramic frame material and monodisperse polystyrene polymer microspheres for template component, in a suspension. Microstructure of the porous ceramic coating layer depends on electrophoretic deposition parameters, and on heat treatment conditions. Under the optimized fabrication conditions, the hydroxyapatite ceramic coating layer with well-controlled macroporous structure was obtained. In vitro examination using a simulated body fluid revealed a good biocompatibility of the macroporous specimen.

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Fabrication of Macroporous Alumina with Tailored Porosity

Cited by 91 publications

References 18 publications

Textured Development of Feeble Magnetic Ceramics by Colloidal Processing Under High Magnetic Field

Textured Development of Feeble Magnetic Ceramics by Colloidal Processing Under High Magnetic Field

Structures and properties of alumina-based ceramic for reconstructive oncology

Macroporous Hydroxyapatite Ceramic Coating by Using Electrophoretic Deposition and Then Heat Treatment

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