Microstructure evolution of a W‐doped ZrB 2  ceramic upon high‐temperature oxidation | Zendy

Silvestroni Laura | Zendy; Sciti Diletta | Zendy; Monteverde Frédéric | Zendy; Stricker Kerstin | Zendy; Kleebe HansJoachim | Zendy

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Microstructure evolution of a W‐doped ZrB 2 ceramic upon high‐temperature oxidation

Author(s) -

Silvestroni Laura,

Sciti Diletta,

Monteverde Frédéric,

Stricker Kerstin,

Kleebe HansJoachim

Publication year - 2017

Publication title -

journal of the american ceramic society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.9

H-Index - 196

eISSN - 1551-2916

pISSN - 0002-7820

DOI - 10.1111/jace.14738

Subject(s) - microstructure , ceramic , materials science , transmission electron microscopy , nanostructure , doping , oxygen , chemical engineering , composite material , metallurgy , nanotechnology , mineralogy , chemistry , optoelectronics , organic chemistry , engineering

This basic research deals with the microstructure evolution of a W‐doped ZrB 2 ceramic, as‐sintered and upon oxidation at 1650°C. Transmission electron microscopy enabled to disclose microstructural features occurred during oxidation never observed before. In the pristine material, (Zr,W)B 2 solid solutions surround the original ZrB 2 nuclei, whereas refractory W‐compounds at triple junctions and clean grain boundaries are distinctive of this ceramic. After oxidation, the microstructure is typified by intragranular nanostructures, in which nanosized W inclusions remained trapped within ZrO 2 grains, or decorate their surfaces. The understanding of the oxidation reactions occurring in the system as a function of the oxygen partial pressure was fundamental to conclude that W‐based compounds do not notably suppress or retard the oxidation of ZrB 2 ceramics.

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