Electrical conductivity of hot-pressed AIN ceramic: Effect of various oxide additives

To suppress the reactivity of AIN powder with water, chemical surface modification with carboxylic acids has been investigated. It was found that the chemical stability of AIN powder increased as the number of carbon atoms in carboxylic acids used for the surface treatment increased. Among the carboxylic acids tested, stearic acid was the most promising from the viewpoint of the chemical stability of the treated powder and the thermal conductivity of the sintered ceramics prepared by cold isostatic pressing and pressureless sintering.

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Effects of Samarium Oxide Addition on the Phase Composition, Microstructure, and Electrical Resistivity of Aluminum Nitride Ceramics

Yoshikawa

Katsuda

Yamada

et al. 2005

Journal of the American Ceramic Society

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The phase composition, microstructure, and electrical resistivity of hot-pressed AlN ceramics with 0-4.8 wt% Sm 2 O 3 additive were investigated. The phase composition was approximately consistent with that estimated from the Sm 2 O 3 -Al 2 O 3 phase diagram using the amount of added Sm 2 O 3 and oxygen content of the AlN raw material. When sintered at more than 18001C, the AlN ceramics with 1.0-2.9 wt% Sm 2 O 3 additive contained an Sm-b-alumina phase wetting the grain boundaries, and their electrical resistivity considerably decreased to 10 10 -10 12 X . cm. This resistivity decrease was caused by the continuity of the Smb-alumina phase with a resistivity lower than that of bulk AlN.

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Electrical conductivity of hot-pressed AIN ceramic: Effect of various oxide additives

Cited by 7 publications

References 8 publications

Dielectric properties of a-GaxSe100−x alloys (0⩽x⩽10)

Dielectric properties of a-GaxSe100−x alloys (0⩽x⩽10)

Effect of Carboxylic Acid Adsorption on the Hydrolysis and Sintered Properties of Aluminum Nitride Powder

Effects of Samarium Oxide Addition on the Phase Composition, Microstructure, and Electrical Resistivity of Aluminum Nitride Ceramics

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