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- Title
Low-Temperature Densification of Zirconium Diboride Ceramics by Reactive Hot Pressing.
- Authors
Chamberlain, Adam L.; Fahrenholtz, William G.; Hilmas, Gregory E.
- Abstract
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.
- Subjects
CERAMICS; ZIRCONIUM; SILICON carbide; LOW temperatures; FLEXURE; STRAINS &; stresses (Mechanics); STRENGTH of materials
- Publication
Journal of the American Ceramic Society, 2006, Vol 89, Issue 12, p3638
- ISSN
0002-7820
- Publication type
Article
- DOI
10.1111/j.1551-2916.2006.01299.x