Growth of Textured Mullite Fibers Using Polycrystalline Precursors
Yoon, Wonki
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https://hdl.handle.net/2142/82807
Description
Title
Growth of Textured Mullite Fibers Using Polycrystalline Precursors
Author(s)
Yoon, Wonki
Issue Date
2007
Doctoral Committee Chair(s)
Kriven, Waltraud M.
Department of Study
Materials Science and Engineering
Discipline
Materials Science and Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Materials Science
Language
eng
Abstract
Mullite whiskers were prepared by HF leaching and templated into polycrystalline mullite fibers by extrusion. Textured growth of mullite fibers with elongated grains, aligned along the long-axis of the fibers, was achieved by heat treatment. Repeated heat treatment cycles of a whisker-templated fiber showed a bamboo-like microstructure. It was confirmed by SEM, TEM and optical microscopy (OM) that the growth direction along the fiber length was the [001] direction of orthorhombic mullite.
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