Unoxidized graphene/alumina nanocomposite: fracture- and wear-resistance effects of graphene on alumina matrix.
Unoxidized graphene/alumina nanocomposite: fracture- and wear-resistance effects of graphene on alumina matrix.
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DOI：
10.1038/srep05176
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发表时间：
2014-06-05
影响因子：
4.6
通讯作者：
Ruoff RS
中科院分区：
文献类型：
--
作者：
Kim HJ;Lee SM;Oh YS;Yang YH;Lim YS;Yoon DH;Lee C;Kim JY;Ruoff RS
韧性、强度和耐磨性的共同提高对于先进结构材料的发展至关重要。在此，我们报告了通过低成本且环境友好的无压烧结工艺合成具有增强韧性、强度和耐磨性的未氧化石墨烯/氧化铝复合材料。即使在高法向载荷条件下（25 N），由于石墨烯的摩擦效应，复合材料的耐磨性也提高了一个数量级，并且与纯Al2O3相比，复合材料的断裂韧性（KIC）和弯曲强度（σf）分别提高了约75%（5.60 MPa·m1/2）和约25%（430 MPa）。此外，我们发现仅一小部分超薄石墨烯（0.25–0.5 vol%，片状厚度为2–5 nm）就足以增强复合材料。与未氧化的石墨烯相比，氧化石墨烯（G-O）和还原氧化石墨烯（rG-O）由于rG-O的机械强度下降和G-O复合材料的结构缺陷而几乎没有或很少地表现出断裂韧性的增强。
It is of critical importance to improve toughness, strength, and wear-resistance together for the development of advanced structural materials. Herein, we report on the synthesis of unoxidized graphene/alumina composite materials having enhanced toughness, strength, and wear-resistance by a low-cost and environmentally benign pressure-less-sintering process. The wear resistance of the composites was increased by one order of magnitude even under high normal load condition (25 N) as a result of a tribological effect of graphene along with enhanced fracture toughness (KIC) and flexural strength (σf) of the composites by ~75% (5.60 MPa·m1/2) and ~25% (430 MPa), respectively, compared with those of pure Al2O3. Furthermore, we found that only a small fraction of ultra-thin graphene (0.25–0.5 vol%, platelet thickness of 2–5 nm) was enough to reinforce the composite. In contrast to unoxidized graphene, graphene oxide (G-O) and reduced graphene oxide (rG-O) showed little or less enhancement of fracture toughness due to the degraded mechanical strength of rG-O and the structural defects of the G-O composites.
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