Highly Electrically Conducting Glass-Graphene Nanoplatelets Hybrid Coatings

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• 作者：E. Garcia ; A. Nistal ; A. Khalifa ; Y. Essa ; F. Mart铆n de la Escalera ; M. I. Osendi ; P. Miranzo
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：August 19, 2015
• 年：2015
• 卷：7
• 期：32
• 页码：17656-17662
• 全文大小：406K
• ISSN：1944-8252

文摘

Hybrid coatings consisting of a heat resistant Y₂O₃鈥揂l₂O₃鈥揝iO₂ (YAS) glass containing 2.3 wt % of graphene nanoplatelets (GNPs) were developed by flame spraying homogeneous ceramic powders-GNP granules. Around 40% of the GNPs survived the high spraying temperatures and were distributed along the splat-interfaces, forming a percolated network. These YAS-GNP coatings are potentially interesting in thermal protection systems and electromagnetic interference shields for aerospace applications; therefore silicon carbide (SiC) materials at the forefront of those applications were employed as substrates. Whereas the YAS coatings are nonconductive, the YAS-GNP coatings showed in-plane electrical conductivity (鈭?0² S路m^鈥?) for which a low percolation limit (below 3.6 vol %) is inferred. Indentation tests revealed the formation of a highly damaged indentation zone showing multiple shear displacements between adjacent splats probably favored by the graphene sheets location. The indentation radial cracks typically found in brittle glass coatings are not detected in the hybrid coatings that are also more compliant.