Abstract
Powdered cordierite (fused and mechanically reduced) feedstock was plasma-sprayed onto a steel substrate and subsequently removed. The substrate-free deposit was thermally cycled and investigated using differential thermal analysis, X-ray diffraction and transmission electron microscopy (TEM). The deposit as sprayed is amorphous, with crystallization to μ-cordierite occurring at ca. 830° C, followed by a transition to high-cordierite at ca. 1000° C. The transition temperature is influenced by the heating rate and the geometry of the sample. Isothermal kinetic studies of crystallization were carried out, with the growth of the crystalline phase being described by a Johnson-Mehl-Avrami equation. The activation energies were obtained from the differential thermal analysis.
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Wang, H.G., Fischman, G.S. & Herman, H. Plasma-sprayed cordierite: structure and transformations. J Mater Sci 24, 811–815 (1989). https://doi.org/10.1007/BF01148761
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DOI: https://doi.org/10.1007/BF01148761