Slip Casting of Alumina Using Porous Alumina Mold

Kondo, Yoshinori; Hashizuka, Yutaka; Nakahara, Masae; Yokota, Kozo

doi:10.2109/jcersj.101.928

Cited by 8 publications

(4 citation statements)

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“…The porous alumina mold was made by uniaxial pressing at 60 MPa from alumina powder (AA05, Sumitomo Chemical Co., Ltd.), and calcined at 1000 C, which detail fabrication process was referred in Ref. 15. The pore radiuses are about 1.7 and 0.2 mm in the plaster and the porous alumina mold, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…The dehydration rates will be varied by using two types of mold. One is the porous alumina mold reported by Kondo et al, which minimizes the contami nation of green body by impurity diffusion from the mold 15) and is favorable for the processing of advanced ceramics. The developing rate of green body can be controlled by changing the pore diameter in the alumina molds.…”

Section: Introductionmentioning

confidence: 99%

“…The developing rate of green body can be controlled by changing the pore diameter in the alumina molds. 15) A plaster mold was used to represent the mold for conventional processing and to change the dehydration rate also.…”

Section: Introductionmentioning

confidence: 99%

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スリップキャスト法で作製したアルミナ成形体の粒子配向度に及ぼす脱水速度の影響

Tanaka

Watanabe

Kato

et al. 2004

J. Ceram. Soc. Japan

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XbvLXg@Åì»µ½A~i¬`ÌÌ±qzüxÉyÚ·E¬xÌe¿ c @EnÓMçEÁ¡PñEàc óE¡ckOÞ Eß¡ËlÞ EA¼hO ·ªZpÈwåw»wnC9402188 ·ªsãxª¬ 16031 Þ ì §YAEZpZ^[Þ¿ZpåC7618031 ¼s½¬ 5871Orientation structure of particles was evaluated quantitatively by an optical method based on polarized light microscopy in an alumina green body prepared by slip casting method using porous alumina and plaster mold. The dehydration rate in the alumina mold was higher than that of the plaster mold. The alumina particles in the green body were always orientated parallel to the surface of the mold. The degree of orientated particles was affected by the dehydration rate during development of the cake. The degree of orientation in the alumina mold system was higher than in plaster mold system for rapid dehydration. The highest degree of particle orientation was obtained at regions near the mold, which was developed at the beginning stage of slip casting. The degree of orientation was explained by the dehydration rate in the mold system.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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スリップキャスト法で作製したアルミナ成形体の粒子配向度に及ぼす脱水速度の影響

Tanaka

Watanabe

Kato

et al. 2004

J. Ceram. Soc. Japan

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“…Translucent Al 2 O 3 has advantage in heat resistance, improving various characteristics and longevity. Many articles have been reported on the production method of translucent Al 2 O 3 ceramics since its first development by Coble [1][2][3]. The number of grain boundaries, the bulk density of the sintered body, the impurity and microscopic imperfections have been listed as factors that affect in-line transmittance [3].…”

Section: Introductionmentioning

confidence: 99%

Surface hydration states of commercial high purity α-Al₂O₃powders evaluated by temperature programmed desorption mass spectrometry and diffuse reflectance infrared Fourier transform spectroscopy

Shirai

Ishizaki

et al. 2005

Science and Technology of Advanced Materials

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The surface of three different grades of commercial high-purity a-Al 2 O 3 powders produced by hydrolysis of aluminum alkoxide, which differ each other in SSA are evaluated by temperature programmed desorption mass spectrometry (TPDMS) and diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy. For the DRIFT evaluation the powders were heated in situ under vacuum from 25 to 700 8C. The TPDMS spectra of desorbed H 2 O were obtained by heating the samples under ultra high vacuum at a rate of 20 K min K1 up to 1200 8C.The presence of hydrogen bonded water molecules, amorphous Al(OH) 3 and AlOOH structures, as well as associated and isolated hydroxyl groups on the surface of all the a-Al 2 O 3 powders investigated is demonstrated. On the surface of one of the powders the presence of crystalline Al(OH) 3 structures, as evidenced by an additional sharp peak in the H 2 O TPDMS spectrum, is confirmed. q

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