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


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.


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

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Article - Journal

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© 2013 Elsevier BV, All rights reserved.

Publication Date

01 Dec 2013