Low Temperature Hot Pressing 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 1650C. the ZrB2 matrix was formed by reacting elemental Zirconium and Boron. Attrition milling of the starting powders produced nanosized (<100nm)Zr particulates that reacted with B below 600C. the reaction resulted in the formation of nanoscale ZrB2 crystallites that could be densified more than 250C below the temperatures required for conventional ZrB2 powder. Because of the low-temperature densification, the resulting ZrB2 grain sizes as small as 0.5 +/- 0.3um for specimens densified at 1650 C and 1.5 +/- 1.2um for specimens densified at 1800C. 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 Hot Pressing of Zirconium Diboride Ceramics by Reactive Hot Pressing," Journal of the American Ceramic Society, Wiley-Blackwell, Jan 2006.
Materials Science and Engineering
Keywords and Phrases
Ceramics; Hot Pressing; Low Temperature; Reactive Hot Pressing; Zirconium Diboride
Article - Journal
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