Feasibility study of producing alumina foam by plasma spraying
A Devasenapathi; H W Ng; G H Tan
Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications
abstract:Plasma spraying was utilized as a tool to produce alumina (Al2O3) foam based on a new methodology. Blended powder of Al2O3and calcium oxide (CaO) of different composition was plasma sprayed on predesigned moulds. The sprayed specimens were subsequently treated in water and glycerol in an ultrasonic cleaner at 808C selectively to dissolve CaO and retain the Al2O3matrix. Microstructural investigation showed a slight porosity similar to that observed in the plasma-sprayed coatings in the as- sprayed untreated specimens, which after treatment in water and glycerol exhibited a considerable increase in the extent of porosity. X-ray diffractometry (XRD) studies confirmed the dissolution of CaO, giving rise to porosity, as exhibited by the presence of peaks corresponding to CaO in the as-sprayed material and its absence after water and glycerol treatments.
keywords:alumina, plasma spraying, ceramic foam, microstructure, porosity
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