Title page for ETD etd-03302010-020107
|Type of Document
||Howell, Robert H.
||Synthesis of fluorophlogopite using solid-state reaction techniques
||Master of Science
||Materials Science and Engineering
|Brown, Jesse J. Jr.
|Gibbs, Gerald V.
|Kander, Ronald G.
|Date of Defense
A commercial solid-state batch process for the manufacturing of synthetic
fluorophlogopite (KMg3A1Si3010F2) mica powder was evaluated and standardized.
The minimum firing temperature and time for this process was determined to be
1000°C for 10 hours to both ensure the complete reaction of the raw materials and
to limit the decomposition of the mica into secondary phases that occurs during
overfiring. The addition of an excess amount of the fluoride K2SiF 6 to compensate
for the loss of fluorine that occurs during firing was found to increase the formation
of fluorophlogopite. Additionally, enclosing the material within closed containers
also limits the loss of fluorine from the batch. The practice of pressing the raw
material blend into cakes before firing was found to have no effect on the formation
of fluorophlogopite and is, therefore, an unnecessary processing step. Finally, a
quality control testing procedure that will be used in industry was developed to
determine the amount of mica formed during a given heat.
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