Browsing by Author "Bradhurst, DH"

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    Atomic diffusion in ceramic oxides
    (Australian Atomic Energy Commission, 1967-12) de Bruin, HJ; Bradhurst, DH; Walker, DG
    Diffusion mechanisms in ceramic oxides are considered and available data in the literature broadly reviewed. It is noted that a simple correlation for cation self-diffusion in oxides based on structural considerations is not likely to eventuate, although some correlation for oxygen diffusion should exist. Greater sensitivity is required to study diffusion in oxides than can be obtained by conventional tracer lapping. The less common methods that may be applicable are reviewed.
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    A metallographic study of the structure of oxide layers on zirconium alloys
    (Australian Atomic Energy Commission, 1972-11) Meller, E; Heuer, PM; Bradhurst, DH
    A study has been made of the effect of different metallographic mounting and polishing techniques on the appearance in cross section of the oxide layers formed on zirconium and its alloys under various conditions of oxidation. Optical micrographs were prepared after the various stages of polishing and compared with scanning electron micrographs of oxide fracture surfaces. For post-transition oxides on Zircaloy-2, similar detail was visible both on the fracture surfaces, and on polished surfaces after prolonged vibratory polishing. It is concluded that surfaces prepared by this technique probably best represent the 'as-grown' structure of the oxide.