Abstract
Hot-pressed zirconium diboride (ZrB 2) matrix composites containing 0–30 vol% silicon carbide (SiC) whiskers have been investigated to determine the effect of composition (i.e. amount of SiC whiskers) on the microstructure, mechanical properties and thermal properties. With increasing SiC whisker volume contents, the flexural strength and fracture toughness of the composites were improved compared to those of monolithic ZrB 2. Flexural strength increased from 629 MPa for pure ZrB 2 to 767 MPa for ZrB 2–30 vol%SiCw. Likewise, fracture toughness ranged from 5.4 to 7.1 MPa m 1/2 over the same composition range. Specific heat capacity increased with SiC whisker addition, while thermal diffusivity and thermal conductivity decreased slightly with the increase of SiC whisker content.
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