Mechanical Behavior of Zirconium Diboride-Silicon Carbide Ceramics at Elevated Temperature in Air

Author

Eric W. Neuman, Missouri University of Science and TechnologyFollow
Greg Hilmas, Missouri University of Science and TechnologyFollow
William Fahrenholtz, Missouri University of Science and TechnologyFollow

Abstract

The mechanical properties of zirconium diboride-silicon carbide (ZrB₂-SiC) ceramics were characterized from room temperature up to 1600⁰C in air. ZrB₂ containing nominally 30 vol% SiC was hot pressed to full density at 1950⁰C using B₄C as a sintering aid. After hot pressing, the composition was determined to be 68.5vol% ZrB₂, 29.5vol% SiC, and 2.0vol% B₄C using image analysis. The average ZrB₂ grain size was 1.9μm. The average SiC particles size was 1.2μm, but the SiC particles formed larger clusters. The room temperature flexural strength was 680MPa and strength increased to 750MPa at 800⁰C. Strength decreased to~360MPa at 1500⁰C and 1600⁰C. The elastic modulus at room temperature was 510GPa. Modulus decreased nearly linearly with temperature to 210GPa at 1500⁰C, with a more rapid decrease to 110GPa at 1600⁰C.

Recommended Citation

E. W. Neuman et al., "Mechanical Behavior of Zirconium Diboride-Silicon Carbide Ceramics at Elevated Temperature in Air," Journal of the European Ceramic Society, vol. 33, no. 15-16, pp. 2889 - 2899, Elsevier BV, Dec 2013.

The definitive version is available at https://doi.org/10.1016/j.jeurceramsoc.2013.05.003

Department(s)

Materials Science and Engineering

Keywords and Phrases

Failure analysis; Hot pressing; Mechanical properties; Silicon carbide; Zirconium diboride; Carbide ceramics; Elevated temperature; Grain size; Mechanical behavior; Room temperature; SiC particles; Sintering Aid

International Standard Serial Number (ISSN)

0955-2219

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2013 Elsevier BV, All rights reserved.

Publication Date

01 Dec 2013