Rapid heating of zirconia nanoparticle-powder compacts by infrared radiation heat transfer

Rapid heating of zirconia nanoparticle-powder compacts by infrared radiation heat transfer

Článek WoS

Homogeneous rapid sintering of nanoparticle powder compacts of yttria-stabilized zirconia was achieved by the radiation heat transfer. Green bodies were prepared by cold isostatic pressing (CIP) at various pressures providing different porosity of samples before sintering. Pressure-less sintering was performed in air at a heating rate of 100 C/min up to the 1500 C/1 min. Scanning electron microscopy, mercury intrusion porosimetry, and Archimedes technique were used to characterize the microstructure and to determine the density of the green and sintered bodies. Contrary to expectations, our results reveal opposite dependence of the green- and sintered densities on the CIP pressure. Since the whole sintering process does not exceed 10 min, to propose what processes are responsible for observed results, our attention is focused on the radiation heat transfer from furnace heating elements into the ceramics. Our arguments are supported bynumerical calculations ofthe electromagneticfield enhancementin/between particles.

Homogeneous rapid sintering of nanoparticle powder compacts of yttria-stabilized zirconia was achieved by the radiation heat transfer. Green bodies were prepared by cold isostatic pressing (CIP) at various pressures providing different porosity of samples before sintering. Pressure-less sintering was performed in air at a heating rate of 100 C/min up to the 1500 C/1 min. Scanning electron microscopy, mercury intrusion porosimetry, and Archimedes technique were used to characterize the microstructure and to determine the density of the green and sintered bodies. Contrary to expectations, our results reveal opposite dependence of the green- and sintered densities on the CIP pressure. Since the whole sintering process does not exceed 10 min, to propose what processes are responsible for observed results, our attention is focused on the radiation heat transfer from furnace heating elements into the ceramics. Our arguments are supported bynumerical calculations ofthe electromagneticfield enhancementin/between particles.

Yttria-stabilized zirconia; Dielectric nanoparticle; Rapid sintering; Radiation heat transfer; Local electromagnetic field enhancement

Yttria-stabilized zirconia; Dielectric nanoparticle; Rapid sintering; Radiation heat transfer; Local electromagnetic field enhancement

KALOUSEK, R.; SPOUSTA, J.; ZLÁMAL, J.; DUB, P.; ŠIKOLA, T.; SHEN, Z.; SALAMON, D.; MACA, K.

2018

01.03.2017

0955-2219

Journal of the European Ceramic Society

37

3

Spojené království Velké Británie a Severního Irska

1067

1072

6