Low-temperature Densification of Zirconium Diboride Ceramics by Reactive Hot Pressing
Zirconium diboride-silicon carbide ceramics with relative densities in excess of 95% were produced by reactive hot pressing (RHP) at temperatures as low as 1650°C. the ZrB2 matrix was formed by reacting elemental zirconium and boron. Attrition milling of the starting powders produced nanosized (<100 nm) Zr particulates that reacted with B below 600°C. the reaction resulted in the formation of nanoscale ZrB2 crystallites that could be densified more than 250°C below the temperatures required for conventional ZrB2 powder. Because of the low-temperature densification, the resulting ZrB2 grain sizes were as small as 0.5±0.30 μm for specimens densified at 1650°C and 1.5±1.2 μm for specimens densified at 1800°C. Vickers hardness, elastic modulus, and flexure strength of fully dense materials produced by RHP were 27, 510, and 800 MPa, respectively.
A. L. Chamberlain et al., "Low-temperature Densification of Zirconium Diboride Ceramics by Reactive Hot Pressing," Journal of the American Ceramic Society, Wiley-Blackwell, Dec 2006.
The definitive version is available at http://dx.doi.org/10.1111/j.1551-2916.2006.01299.x
Materials Science and Engineering
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