Hot Pressing Sintering of ZrB₂ with β-SiC Addition

Abstract:

Zirconium diboride (ZrB₂) is a material of particular interest because of the excellent and unique property combination of high melting point, high electrical and thermal conductivity. In this work, the effect of addition of beta-silicon carbide (β-SiC) on hot pressing sintering of ZrB₂ was investigated. Four compositions were studied with 0, 10, 20 e 30 vol% of SiC. ZrB₂ powder and mixtures were prepared by planetary milling with SiC spheres during 4 h. Samples were sintered at 1850 °C/1h with a pressure of 20 MPa in argon atmosphere. β-SiC has undergone phase transformation to α-SiC during sintering. The addition of SiC increased densification with increasing of SiC content. The total densification of sample was 96.8 % of theoretical density for sample with 30 vol% of SiC and Vickers hardness was 19.9 ± 0.3 GPa.

• Periodical: Materials Science Forum (Volume 820)
• Pages: 262-267
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.820.262
• Online since: June 2015
• Authors: Mariah Oliveira Juliani, Rosa Maria Rocha*
• Keywords: Hot Pressing, Sintering, UHTC, Ultra High Temperature Ceramics, ZrB₂, β-SiC

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