Graphene and carbon nanotube (GNT)-reinforced alumina nanocomposites
Graphene and carbon nanotube (GNT)-reinforced alumina nanocomposites
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DOI：
10.1016/j.jeurceramsoc.2014.08.043
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发表时间：
2015-01-01
影响因子：
5.7
通讯作者：
Zhu, Yanqiu
中科院分区：
文献类型：
--
作者：
Yazdani, Bahareh;Xia, Yongde;Zhu, Yanqiu
采用热压法制备了杂化GNTs（石墨烯纳米片，GNPs和碳纳米管，CNTs）增强氧化铝纳米复合材料。研究了不同GNT含量对纳米复合材料微观组织特征和力学性能的影响。分散良好的GNT填料提高了复合材料的烧结密度（>99%），而CNTs和GNPs的加入则改变了复合材料的断裂模式、细化了复合材料的晶粒、提高了复合材料的强度和柔韧性。纳米复合材料的平均断裂韧性可达5.7 MPa m(1/2)，而普通氧化铝的断裂韧性为3.5 MPa m(1/2)，在0.5 wt% GNPs和1 wt% CNTs的混合添加下，其抗弯强度从360 MPa提高到424 MPa。通过形貌、晶粒尺寸和断裂模式的分析，探讨了GNT填料独特的形貌和结构所导致的增韧机理。(C) 2014 Elsevier Ltd.版权所有。
Alumina nanocomposites reinforced with hybrid GNTs (graphene nanoplatelets, GNPs, and carbon nanotubes, CNTs) were fabricated by hot-pressing. The effects of varied GNT contents on the microstructural features and mechanical properties of the nanocomposites were investigated. The well-dispersed GNT fillers resulted in higher sintered densities (>99%) in the composites, whilst the fracture mode alteration, grain refinement and improved strength and flexibility of the composites are associated with the CNTs and GNPs. The average fracture toughness of the nanocomposites reached up to 5.7 MPa m(1/2), against 3.5 MPa m(1/2) of the plain alumina, and the flexural strength improved from 360 MPa to 424 MPa, at a hybrid addition of 0.5 wt% GNPs and 1 wt% CNTs. Toughening mechanisms attributed with the unique morphologies and structures of the GNT fillers were also discussed based on analyses on the morphology, grain sizes and fracture mode. (C) 2014 Elsevier Ltd. All rights reserved.