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Pressureless sintering of zirconium diboride using boron carbide and carbon additions

Journal of the American Ceramic Society, ISSN: 0002-7820, Vol: 90, Issue: 11, Page: 3660-3663
2007
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The synergistic roles of boron carbide and carbon additions in the enhanced densification of zirconium diboride (ZrB ) by pressureless sintering have been studied. ZrB 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 (ZrO and B O ) 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·m ), 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. © 2007 The American Ceramic Society.

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