Evolution of Structure during the Oxidation of Zirconium Diboride-Silicon Carbide in Air Up to 1500°C

Abstract

The structures that developed as dense ZrB2-SiC ceramics were heated to 1500°C in air were characterized using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction. The oxidation behavior was also studied using thermal gravimetric analysis (TGA). Below 1200 °C, a protective B2O3-rich scale was observed on the surface. At 1200 °C and above, the B2O3 evaporated and the SiO2-rich scale that formed was stable up to at least 1500 °C. Beneath the surface, layers that were rich in zirconium oxide, and from which the silicon carbide had been partially depleted, were observed. The observations were consistent with the oxidation sequence recorded by thermal gravimetric analysis.

Department(s)

Materials Science and Engineering

Keywords and Phrases

Ceramic Matrix Composite; Composite Material; Dispersive Spectrometry; Experimental Study; High Temperature; Microstructure; Non Oxide Ceramics; Oxidation; Scanning Electron Microscopy; Silicon Carbide; Surface Structure; Technical Ceramics; Temperature Effect; Thermogravimetry; Ultra High Temperature Ceramic Materials; X Ray Diffraction; X Ray Spectrometry; Zirconium Boride

International Standard Serial Number (ISSN)

0955-2219; 1873-619X

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2008 Elsevier Inc., All rights reserved.

Publication Date

01 Jan 2008

Link to Full Text

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