Processing and characterisation of new nanocrystalline Al₂O₃–fly ash composites
by N. Saheb, T.C. Yoong
International Journal of Microstructure and Materials Properties (IJMMP), Vol. 3, No. 6, 2008

Abstract: In this study, new nanocrystalline Al₂O₃–fly ash Ceramic Matrix Composites (CMCs) were developed through the powder metallurgy route. It was found that wet milling of the mixture for 18 h improved mixing, decreased the Al₂O₃ crystallite size to around 10 nm, and reduced the fly ash particle size. For samples sintered at 1350°C for 16 h, the addition of 5 wt% fly ash to alumina increased the micohardness from 525 to 1325 HV while the addition of 10 and 20 wt% decreased it to 508 and 444 HV respectively. Composites containing 5 and 10 wt% fly ash had higher density than Al₂O₃, while samples containing 20 wt% fly ash had lower density. Increasing the sintering time led to the increase in the density of all the samples sintered at 1350°C.

Online publication date: Mon, 19-Jan-2009

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