Abstract
The mechanical properties and thermal stability of the Al 2O 3/Er 3Al 5O 12 (EAG) eutectic ceramics have been investigated at very high temperature. The emissive properties of this eutectic ceramics have also been measured and its possibilities of application to an emitter have been discussed. The present eutectic ceramic has excellent high-temperature strength characteristics, showing that tensile yielding stress is approximately 300 MPa at 1650 °C and superior thermal stability at 1700 °C in an air atmosphere. The present material shows strong selective emission bands at wavelength 1.5 μm due to Er 3+ ion. The emission bands of this material are nearly coincident with the sensitive region of GaSb PV cell, therefore, the Al 2O 3/EAG eutectic ceramic can be regarded as one of the promising emitter materials in TPV systems.
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