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Laser-Fused Transparent Microspheres with the Eutectic Composition Al2O3-Y2O3-ZrO2 (AYZ)
C. Oelgardt1, J. Günster2, J. G. Heinrich1
1 Clausthal University of Technology, Institute of Nonmetallic Materials, Department for Engineering Ceramics, 38678 Clausthal-Zellerfeld, Germany
2 BAM – Federal Institute for Materials Research and Testing, Division 5.4 – Advanced Ceramics, 12203 Berlin, Germany
received March 9, 2011, , accepted March 22, 2011
Vol. 2, No. 2, Pages 103-110 DOI: 10.4416/JCST2011-00010
Abstract
Transparent microspheres with the eutectic composition 65 Al2O3-16 Y2O3-19 ZrO2 (mol%) have been produced by laser fusing with a CO2 laser. The influence of the starting material – not pre-calcined and pre-calcined – as well as the laser power on the resulting microspheres – was investigated. After fabrication, the microspheres were analyzed by means of XRD to quantify the amorphous content of the spheres as well as to identify the residual crystalline phases, with a laser granulometer to measure the particle sizes of the starting material and the resulting microspheres, with DSC to characterize the glass transition temperature and crystallization behavior, and with SEM to investigate the microstructure of the microspheres. The laser-treated materials consist of transparent and opaque beads as well as sintered particles. The amorphous amount in the samples was detected to be ∼ 85 %. Based on these results transparent beads were collected and annealed over a range of temperatures to analyze the crystallization behavior.
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Keywords
Eutectic ceramics, Al2O3-Y2O3-ZrO2, laser processing, crystallization behavior, microstructure
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