Effect of Yttria on the Thermal Conductivity of Aluminum Nitride

The effect of yttria additions up to 10 wt% on the thermal conductivity of pressureless‐sintered aluminum nitride was investigated. Additions of up to 3 wt% increased the thermal conductivity to values around 160 W/(m·K). Additions higher than 5 wt% slowly decreased the thermal conductivity because...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 1994-07, Vol.77 (7), p.1846-1850
Main Authors: de Baranda, Pedro Sainz, Knudsen, Arne K., Ruh, Edwin
Format: Article
Language:English
Subjects:
360204 - Ceramics, Cermets, & Refractories- Physical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM NITRIDES
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
CHALCOGENIDES
Chemical industry and chemicals
Electrotechnical and electronic ceramics
Exact sciences and technology
FABRICATION
MATERIALS SCIENCE
METALLURGICAL EFFECTS
NITRIDES
NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PNICTIDES
SINTERING
Technical ceramics
THERMAL CONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
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Description
Summary:The effect of yttria additions up to 10 wt% on the thermal conductivity of pressureless‐sintered aluminum nitride was investigated. Additions of up to 3 wt% increased the thermal conductivity to values around 160 W/(m·K). Additions higher than 5 wt% slowly decreased the thermal conductivity because of the increasing volume fraction of the low‐conductivity yttrium aluminate phases. In all cases samples containing the same yttria content with the binder burned out in nitrogen had higher thermal conductivity than those with the binder burned out in air. Comparisons are made to previous studies containing additives of silica and calcia to aluminum nitride.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1151-2916.1994.tb07060.x