Abstract
The method for synthesizing alumina-based composite materials containing up to 2wt.% graphene sheets uniformly distributed in the ceramic matrix are prepared by the metallurgical route. Composites of graphene platelets and powdered alumina were made using ball milling, hot isostatic pressing and sintering. The properties of composites were studied using nanoindentation, transmission electron microscopy, micro-Raman and X-ray diffraction. In this present work, successfully alumina–graphene (1–2wt.%) composites were prepared by a dry planetary ball milling process followed by sintering. The microhardness and Young’s modulus values increase with the increasing addition of graphene in the composite. The improved elastic modulus infers flexibility developed in alumina ceramics. Microstructural and mechanical results indicate that graphene addition improves the structural and mechanical of composite. This present research work opens new scope for using alumina ceramic with improved properties and retaining its structure making it a suitable material to be used at elevated temperatures under critical load.
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