Title

The ZrB₂ Volatility Diagram

Abstract

A volatility diagram was calculated for temperatures of 1000, 1800, and 2500 K to understand the oxidation of ZrB2. Applying the diagram, it can be seen that exposure of ZrB2 to air produces ZrO2 (cr) and B2O3 (l) over the temperature range considered. the pressure of the predominant vapor species was predicted to increase from ∼10−6 Pa at 1000 K, to 344 Pa at 1800 K, and to ∼105 Pa at 2500 K. Predictions were consistent with experimental observations that ZrB2 exhibits passive oxidation below 1200 K, but undergoes active oxidation at higher temperatures due to B2O3 (l) evaporation.

Department(s)

Materials Science and Engineering

Keywords and Phrases

Volatility Diagrams; Zirconium Boride

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2005 Wiley-Blackwell, All rights reserved.

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