Electrically conductive graphene nanoplatelet/boron carbide composites with high hardness and toughness

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• 作者：Yongqiang Tan ; Haibin Zhang ; ^{hbzhang@caep.cn" class="auth_mail" title="E-mail the corresponding author} ; Shuming Peng ; ^{pengshuming@caep.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Ceramic matrix composites ; Spark plasma sintering ; Electrical properties ; Mechanical properties ; Graphene nanoplatelet
• 刊名：Scripta Materialia
• 出版年：2016
• 出版时间：15 March 2016
• 年：2016
• 卷：114
• 期：Complete
• 页码：98-102
• 全文大小：1104 K

文摘

B₄C composites containing 1–4 vol.% graphene nanoplatelet (GNP) were fabricated aiming at obtaining electrically conductive B₄C composites with high toughness. The electrical conductivity of B₄C composite was enhanced remarkably with the addition of only 2 vol.% GNPs. Besides, all the GNP/B₄C composites maintained high Vickers hardness. The fracture toughness kept increasing with the increase of GNPs volume fraction and a high value of 5.26 MPa·m^1/2 was obtained in GNP/B₄C composite with 4 vol.% GNPs. The main toughening mechanisms include GNPs pull-out, crack deflection and crack bridging.