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Control of crystalline texture in polycrystalline alumina ceramics by electrophoretic deposition in a strong magnetic field

Published online by Cambridge University Press:  03 March 2011

T. Uchikoshi ,
T.S. Suzuki ,
H. Okuyama  and
Y. Sakka
T. Uchikoshi
Affiliation:
National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0047, Japan
T.S. Suzuki
Affiliation:
National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0047, Japan
H. Okuyama
Affiliation:
National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0047, Japan
Y. Sakka
Affiliation:
National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0047, Japan
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Abstract

Highly crystalline-textured pure dense alumina ceramics were fabricated from spherical alumina powder without any seed particles and sintering additives by electrophoretic deposition (EPD) in a strong magnetic field of 10 T. The crystalline texture was confirmed by x-ray diffraction (XRD) for alumina ceramics deposited at 10 T followed by sintering at 1873 K. The angle between the directions of the magnetic and electric fields (φB-E) was altered to control the dominant crystal faces of the α-alumina monoliths. The average orientation angles estimated from the XRD diagram of the samples prepared at φB-E = 0°, 45°, and 90° were 16.52°, 45.15°, and 84.90°, respectively. Alumina/alumina laminar composites with different crystalline-oriented layers were also fabricated by alternately changing the φB-E layer by layer during EPD in a 10 T magnetic field. It was demonstrated that by using this technique, it is possible to control the crystalline orientation by changing the angle of E versus B during the EPD.

Keywords

CeramicTextureLayered
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 5 , May 2004 , pp. 1487 - 1491
Copyright
Copyright © Materials Research Society 2004

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