Synthesis of ZrB₂-SiC-ZrC nanocomposite by spark plasma in ZrSiO₄/B₂O₃/C/Mg system

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• 作者：S.M. Emami ; E. Salahi ; ^{e-salahi@merc.ac.ir" class="auth_mail" title="E-mail the corresponding author} ; M. Zakeri ; S.A. Tayebifard
• 关键词：Silicon carbide (SiC) ; Zirconium diboride (ZrB2) ; Zirconium carbide (ZrC) ; Self propagation high temperature synthesis (SHS) ; Spark plasma synthesis (SPSyn)
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：1 May 2016
• 年：2016
• 卷：42
• 期：6
• 页码：6581-6586
• 全文大小：1145 K

文摘

A novel reduction process by spark plasma is proposed for the synthesis of homogeneous intermixed ZrB₂–SiC–ZrC nanostructure powder using ZrSiO₄, B₂O_3, C and Mg as starting materials. In the present research, the reaction mechanisms were investigated by the displacement–temperature–time (DTT), the displacement rate–temperature and the displacement rate–time diagrams which were obtained during spark plasma cycles. The synthesis process of the composite was completed after 15 min at temperature of 400 °C. The total shrinkage of 5.5 mm was observed due to the rearrangement and reaction phenomenon. The main shrinkage occurs within a period of less than 1 min at 400 °C similar to the self propagating high temperature synthesis. Finally using Rietveld method, the mean crystallites sizes of about 26, 25 and 22 nm were calculated for ZrB₂, SiC and ZrC phases, respectively.