Study of Microwave Heating Effect in the Behaviour of Graphene as Second Phase in Ceramic Composites

Materials
Rut BenaventeAmparo Borrell

Abstract

The choice of the right material is essential in microwave processing. The carbon materials are good microwave absorbers, which allows them to be transformed by microwave heating into new carbon materials with adapted properties, capable of heating other materials indirectly. In this paper, the microwave heating of graphene as reinforcement of the lithium aluminosilicate (LAS) ceramics has been explored. LAS ceramics have a near-zero coefficient of thermal expansion and exhibit an effective and efficient heating by microwave. Nevertheless, we have found that the graphene did not show any significant response to the microwave radiation and, hence, the interaction as mechanical reinforcement with the LAS material is harmful. The possible benefits of graphene materials to microwave technology are widely known; however, the mechanism involved in the interaction of microwave radiation with ceramic-graphene composites with high dielectric loss factors has not been addressed earlier.

References

Mar 3, 2007·Nature Materials·A K Geim, K S Novoselov
Feb 21, 2008·Nano Letters·Alexander A BalandinChun Ning Lau
Apr 30, 2014·Nature Materials·Matthew YankowitzBrian J LeRoy
Feb 9, 2012·Science and Technology of Advanced Materials·Amparo BorrellAdolfo Fernández

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Methods Mentioned

BETA
Raman spectroscopy
electron microscopy

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