Characterization of GNP-Containing Al2O3 Nanocomposites Fabricated via High Frequency-Induction Heat Sintering Route

被引:0
作者
Iftikhar Ahmad
Mohammad Islam
Tayyab Subhani
Yanqiu Zhu
机构
[1] King Saud University,Deanship of Scientific Research, Advanced Manufacturing Institute
[2] Institute of Space Technology,Composite Research Center, Department of Materials Science and Engineering
[3] University of Exeter,College of Engineering, Mathematics and Physical Sciences
来源
Journal of Materials Engineering and Performance | 2015年 / 24卷
关键词
Al; O; graphene nanoplatelets (GNP); interface; microstructure; nanocomposite;
D O I
暂无
中图分类号
学科分类号
摘要
In this paper, we present alumina (Al2O3) nanocomposites reinforced with various graphene nanoplatelets (GNPs) concentrations (0.75 and 1.25 wt.%) and fabricated by rapid high frequency-induction heat (HF-IH) sintering route. The influence of the GNP on the microstructures, mechanical properties, and interfacial connections of the resulting nanocomposites were thoroughly investigated. GNPs were synthesized using combined chemical oxidation and thermal exfoliation processes and dispersed homogenously into base Al2O3 ceramic matrix using colloidal chemistry technique. Pressure-assisted HF-IH sintering rapidly consolidated nanocomposites close to theoretical densities (~99%) without damaging the GNP intrinsic nanostructures and electron microscopy revealed firmly bonding of the nanocomposite constituents at interfaces. Nanocomposite samples containing 0.75 wt.% GNP demonstrated 60% finer microstructure with 45% higher fracture toughness (KIC) and 9% improvement in hardness against benchmarked monolithic Al2O3. However, nanocomposites loaded with higher GNP contents (1.25 wt.%) showed deprived properties due to GNP accumulations. Homogenous dispersions and two-dimensional features allowed GNP to interact wide area of the matrix grains thus refined the microstructure and gave rise the grain anchoring mechanism thereby led nanocomposite to superior mechanical properties following GNP crack-bridging and pull-out toughening mechanisms.
引用
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页码:4236 / 4243
页数:7
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