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Combined Microwave and Laser Heating for Glazing of 8Y–ZrO2 and 8Y–ZrO2/ZrSiO4–Composites

Titelangaben

Richter, Christian ; Lehmann, Sebastian ; Böckler, Jens ; Willert-Porada, Monika ; Rosin, Andreas:
Combined Microwave and Laser Heating for Glazing of 8Y–ZrO2 and 8Y–ZrO2/ZrSiO4–Composites.
In: Advanced Engineering Materials. (Oktober 2017) .
ISSN 1527-2648
DOI: https://doi.org/10.1002/adem.201700912

Abstract

Sintered porous yttria-stabilized zirconia and zirconia composite ceramics with zirconium silicate are surface glazed by Laser-Assisted Microwave Plasma Processing (LAMPP). Suitable process parameters for surface glazing are determined for those ceramics. The plasma process is monitored by means of pyrometry and optical emission spectroscopy. In order to prove the quality of the surface glazing and to characterize hot corrosion resistance, tests with molten vanadium pentoxide are performed. After 4 h of exposure, the penetration depth of the molten salt is investigated as a function of ceramic composition and pre-treatment by glazing. Upon hot corrosion testing of glazed and non-glazed ceramics, the molten vanadium pentoxide reacts selectively with yttrium oxide, forming yttrium vanadate, and causes crack formation in the zirconia ceramics due to transition to monoclinic zirconia. The results for LAMPP-glazed ceramics show, that a surficial melting phase is achieved because process temperatures exceed 3000 °C. Hence, a dense, crack-free and hardness-enhanced surface layer achieves a better resistance to hot corrosion as compared to non-glazed ceramics. Due to LAMPP-glazing, the vanadium ingress is reduced from 33 to 7 μm for yttria-stabilized zirconia and from 104 to 17 μm for zirconia composite ceramic. Reactions and microstructural changes taking place upon LAMP-Processing are discussed.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Zusätzliche Informationen: Early View = Online Version of Record published before inclusion in an issue
Institutionen der Universität: Fakultäten > Fakultät für Ingenieurwissenschaften
Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Werkstoffverarbeitung
Fakultäten
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Eingestellt am: 17 Okt 2017 09:44
Letzte Änderung: 09 Jan 2018 07:59
URI: https://eref.uni-bayreuth.de/id/eprint/40058