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TEM study of the surface morphology of extracted ZrO2-Al2O3 fibres

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Abstract

The surface morphology and microstructure of a series of melt extracted ZrO2-Al2O3 based fibres (ZA, ZAT and ZAS) have been imaged at the nanometre scale by transmission electron microscopy (TEM) using an advanced Pt/C replica technique. Growth characteristics of ZrO2, Al2O3 and other crystalline phases formed upon heating up to 1550 °C are illustrated and described. Several grain morphologies including spherical and polygonal grains, as well as grains with rounded plate-like growth were observed indicating different active growth mechanisms. ZrO2 particles on the surface of the fibres were almost spherical with some facetting and rounding of corners. These grains were very fine (< 50 nm) in the ZA and ZAS fibres while they were several microns in size in the ZAT fibres. Al2O3 grains were generally much larger (up to several microns) and exhibited two distinct growth morphologies of layered and rhombohedral type. Different grain morphologies of the ZA and ZAS fibres have been correlated to the phases identified by X-ray diffraction.

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Authors and Affiliations

  1. Departments of Earth and Planetary Science, McGill University, 3450 University St, H3A 2A7, Montreal, Canada

    H. Vali, M. Allahverdi & R. A. L. Drew

  2. Mining and Metallurgical Engineering, McGill University, 3450 University St, H3A 2A7, Montreal, Canada

    M. Allahverdi & R. A. L. Drew

Authors
  1. H. Vali
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  2. M. Allahverdi
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  3. R. A. L. Drew
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Vali, H., Allahverdi, M. & Drew, R.A.L. TEM study of the surface morphology of extracted ZrO2-Al2O3 fibres. JOURNAL OF MATERIALS SCIENCE 31, 6177–6184 (1996). https://doi.org/10.1007/BF00354435

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