Combustion synthesis and spark plasma sintering of MgAl2O4-graphene composites

Combustion synthesis and spark plasma sintering of MgAl2O4-graphene composites
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MgAl2O4-石墨烯复合材料的燃烧合成及放电等离子烧结

DOI:
10.1016/j.ceramint.2019.01.060
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发表时间:
2019-04
影响因子:
5.2
通讯作者:
Li Jiangtao
Li Jiangtao
中科院分区:
材料科学1区
文献类型:
--
作者:
Yang Lei;Meng Qing;Lu Nan;He Gang;Li Jiangtao

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以燃烧合成的陶瓷-石墨烯粉末混合物为原料,采用放电等离子烧结法制备了镁铝石墨烯复合材料。石墨烯的合成和分散很容易通过镁粉和二氧化碳气体之间的燃烧反应完成。与纯镁铝相比,含2.5 %石墨烯的复合材料的相对密度由10 0%降至95.1%,平均晶粒尺寸由94 µm降至0.4 µm。当石墨烯含量为0.5wt%时,复合材料的抗弯强度和断裂韧性分别提高了34%(从217wt%到291 Mpa)和32%(从1.91mpa提高到2.52m1/2)。当石墨烯含量为0.5wt%时,复合材料的抗弯强度和断裂韧性提高了32%(  m1/2)。所制备的MgAl2O4-石墨烯复合材料可能为耐恶劣环境提供一种替代耐火材料。
MgAl2O4-graphene composites have been fabricated from combustion synthesized ceramic-graphene powder mixtures by spark plasma sintering. The synthesis and dispersion of graphene was accomplished readily by a combustion reaction between Mg powders and CO2gas. Compared with that of pure MgAl2O4, the relative density decreases from 100% to 95.1% and the average grain size decreases from 94 to 0.4 µm for composites containing 2.5 wt% graphene. The bending strength and fracture toughness of the as-prepared MgAl2O4-graphene composites increased by 34% (from 217 to 291 MPa) and 32% (from 1.91 to 2.52 MPa m1/2) at 0.5 wt% graphene content. The prepared MgAl2O4-graphene composites may provide an alternative refractory material to withstand harsh environments.
具有可调电荷载流子类型的高导电性少层石墨烯/Al2O3纳米复合材料
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