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Influence of CaO–SiO2 ratio on the chemistry of intergranular films in liquid-phase sintered alumina and implications for rate of erosive wear

Published online by Cambridge University Press:  26 November 2012

Rik Brydson ,
Peter C. Twigg ,
Fiona Loughran  and
Frank L. Riley
Rik Brydson
Affiliation:
Department of Materials, School of Process, Environmental and Materials Engineering, University of Leeds, Leeds LS2 9JT, United Kingdon
Peter C. Twigg
Affiliation:
Department of Materials, School of Process, Environmental and Materials Engineering, University of Leeds, Leeds LS2 9JT, United Kingdon
Fiona Loughran
Affiliation:
Department of Materials, School of Process, Environmental and Materials Engineering, University of Leeds, Leeds LS2 9JT, United Kingdon
Frank L. Riley
Affiliation:
Department of Materials, School of Process, Environmental and Materials Engineering, University of Leeds, Leeds LS2 9JT, United Kingdon
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Abstract

Polycrystalline aluminas sintered with 10 wt% additions of calcium oxide (CaO) and silica (SiO2) in varying molar ratios were fabricated via precipitation, calcination, and hot pressing. Alumina microstructures were analyzed by scanning electron microscopy in terms of their mean grain size, grain size distribution, and grain aspect ratios. High-resolution transmission electron microscopy (HRTEM) showed the presence of an amorphous intergranular glassy phase at two- and three-grain boundaries. The intergranular film width at two-grain boundaries, determined by HRTEM, appeared to vary with the [CaO]:[SiO2] ratio of the additive as did the chemical composition and local chemistry, determined by high-resolution analytical transmission electron microscopy and scanning transmission electron microscopy (using both energy dispersive x-ray and electron energy loss spectroscopy). The factors influencing the erosive wear rate are discussed including the chemistry and associated fracture energy of the intergranular glassy film. Wet erosive wear rates of the densified materials were determined and had a strong dependence on the [CaO]:[SiO2] ratio in the additive.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 3 , March 2001 , pp. 652 - 665
Copyright
Copyright © Materials Research Society 2001

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