Toughness control of boron carbide obtained by spark plasma sintering in nitrogen atmosphere

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• 作者：Petre Badica ; Hanna Borodianska ; Shumao Xie ; Ting Zhao ; Dmytro Demirskyi ; Peifeng Li ; Alfred I.Y. Tok ; Yoshio Sakka ; Oleg Vasylkiv
• 关键词：C. Hardness ; Boron carbide ; SPS ; Toughness ; SHPB
• 刊名：Ceramics International
• 出版年：March, 2014
• 年：2014
• 卷：40
• 期：2
• 页码：3053-3061
• 全文大小：3511 K

文摘

Boron carbide ceramic was prepared by reactive Spark Plasma Sintering under N₂-atmosphere and for different heating times and maximum pressure regimes. Split-Hopkinson Pressure Bar (SHPB), indentation, XRD and microscopy measurements were performed for samples characterization. It is shown that SHPB toughness control depending on SPS regime is possible and the main reason is introduction of nitrogen into B₄C ceramic. Complex relationships between processing conditions, sintering mechanism, material's specifics, static and dynamic mechanical properties are discussed. Improvement of dynamic toughness is through mechanisms resembling those working for static load conditions such as cracks deflection and pull out, but there are also significant differences.