Mechanochemical and volume combustion synthesis of ZrB₂

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• 作者：Bar&#x131 ; ş ; Akgü ; n^a ; ¹ ; H. Erdem Ç ; amurlu^b ; ^{erdemcamurlu@gmail.com"" rel=""nofollow} ; Yavuz Topkaya^a ; ¹ ; Naci Sevinç ; ^a ; ^{nsevinc@metu.edu.tr"" rel=""nofollow}
• 关键词：ZrB₂ ; Volume combustion synthesis ; Mechanochemical process ; Borides
• 刊名：International Journal of Refractory Metals and Hard Materials
• 出版年：2011
• 出版时间：September 2011
• 年：2011
• 卷：29
• 期：5
• 页码：601-607
• 全文大小：910 K

文摘

Formation of ZrB₂ by volume combustion synthesis (VCS) and mechanochemical process (MCP) from ZrO₂–Mg–B₂O₃ was studied. Production of ZrB₂ by VCS in air occurred with the formation of side products, Zr₂ON₂ and Mg₃B₂O₆ in addition to MgO and ZrB₂. Zr₂ON₂ formation was prevented by conducting VCS experiments under argon. Wet ball milling was applied to the VCS products before leaching for easier removal of Mg₃B₂O₆ phase. MgO and Mg₃B₂O₆ were removed from wet ball-milled products by leaching in 5 M HCl for 2.5 h. In MCP, 30-hour ball milling was found to be sufficient for the formation of ZrB₂ with no minor phase formation. Leaching of MCP products in 1 M HCl for 30 min was sufficient to remove MgO. Complete conversion of ZrO₂ to ZrB₂ did not take place in both production methods, even with excess amounts of Mg and B₂O₃. Therefore, formed ZrB₂ contained residual ZrO₂.