Pressureless Sintering of Zirconium Diboride Using Boron Carbide and Carbon Additions

Authors: Zhu, Sumin; Fahrenholtz, William G.; Hilmas, Gregory E.; Zhang, Shi C.

Source: Journal of the American Ceramic Society, Volume 90, Number 11, November 2007 , pp. 3660-3663(4)

Publisher: Wiley-Blackwell

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Abstract:

The synergistic roles of boron carbide and carbon additions in the enhanced densification of zirconium diboride (ZrB2) by pressureless sintering have been studied. ZrB2 was sintered to >99% relative density at 1900°C. The combination of 2 wt% boron carbide and 1 wt% carbon promoted densification by removing surface oxide impurities (ZrO2 and B2O3) and inhibiting grain growth. Four-point bending strength (473±43 MPa), Vickers' microhardness (19.6±0.4 GPa), fracture toughness (3.5±0.6 MPa·m1/2), and Young's modulus (507 GPa) were measured. Thermal gravimetry showed that the combination of additives did not have an adverse effect on the oxidation behavior.

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/j.1551-2916.2007.01936.x

Affiliations: Department of Materials Science and Engineering, University of Missouri-Rolla, Rolla, Missouri 65409

Publication date: November 1, 2007

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