Rychlé zahřátí zirkon-oxidového nanočásticového prášku pomocí přenosu tepla infrazářením

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

journal article in Web of Science

en

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.

Homogenní rychlé slinování nanočástic práškového yttriem stabilizovaného ozidu zirkonu bylo dosaženo pčenosem tepla infrazářením.

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.

Yttriem stabilizovaný zirkon-oxid; Dielektrické nanočástice; Rychlé slinování; Přenos tepla zářením; Zesílení lokálního elektromagnetického pole

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

01.03.2017

0955-2219

37

3

1067–1072

6