Synthesis of nanostructured spherical aluminum oxide powders by plasma engineering

    Authors

    T. Laha; K. Balani; A. Agarwal; S. Patil;S. Seal

    Comments

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    Abbreviated Journal Title

    Metall. Mater. Trans. A-Phys. Metall. Mater. Sci.

    Keywords

    RAPID SOLIDIFICATION; COATINGS; MICROSTRUCTURE; KINETICS; ALLOYS; Materials Science, Multidisciplinary; Metallurgy & Metallurgical; Engineering

    Abstract

    Irregularly shaped aluminum oxide particles were plasma atomized resulting in narrow size range distribution of spherical nanostructured powders. Cooling rates, on the order of 10(6) to 10(8) K/s, were obtained from the different quenching medias, viz. air, water, and liquid nitrogen. Plasma-engineered powder particles developed nanosize crystallites, while solidification provided insight into the morphological feasibility in refinement of grain size. X-ray diffraction (XRD) methods have been used to quantify the crystallite size obtained with different quenching media. Raman peak shift validated the X-ray analysis in anticipating the grain refinement with increasing cooling rates. Salient structural morphology characteristics and a detailed understanding of spheroidized plasma-sprayed alumina powders were analyzed through scanning electron microscopy (SEM) studies. Formation of nanograins, novel metastable phases, and amorphous structure were endorsed by transmission electron microscopy (TEM) investigations.

    Journal Title

    Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science

    Volume

    36A

    Issue/Number

    2

    Publication Date

    1-1-2005

    Document Type

    Article

    Language

    English

    First Page

    301

    Last Page

    309

    WOS Identifier

    WOS:000226679300003

    ISSN

    1073-5623

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