Reinforcements for high temperature ceramics Page: 4 of 61
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REINFORCEMENTS FOR HIGH TEMPERATURE CERAMICS
C. I. Kyriacou, J. L. Sepulveda, and M. A. Watson
Tucson, Arizona 85714
A method has been investigated and developed to grow TiB2
whiskers by the VLS mechanism. The overall reaction for the
formation of the whiskers is:
TiCl4(g) + 2BBr5(g) + 5H2<g) —> TiB2 + 6HBr(g) + 4HCl(g) (1)
The reaction was carried out in a quartz tube 3" in
diameter, 30" long at about 1150"C in the presence of a
catalyst. The basic experimental parameters, a substrate, and
a catalyst, for the growth of the whiskers have been defined.
The whiskers produced have shown variable size and morphology
depending on the experimental conditions, and location of the
whiskers from the input port. The corrosion of the catalyst
by the gas environment, and the gas distribution profile in
the furnace had a serious effect on the reproducibility of the
experimental results, and the overall yield of whiskers.
Titanium diboride is a refractory material with metallic
properties such as high thermal and electrical conductivity,
resistant to oxidation at high temperatures and chemical
inertness to acid environments. TiB2 is wetted well and has
low solubility in most molten metals below 1000°C. The
properties of TiB2 are summarized in Table 1. Titanium
diboride can be used as an abrasive, protective coating, high
temperature electrodes, and high temperature structural
applications. Whiskers of TiB2 can be used as reinforcement to
produce metal and ceramic matrix composites for high
temperature, advanced technology applications.
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Kyriacou, C. I.; Sepulveda, J. L. & Watson, M. A. Reinforcements for high temperature ceramics, report, April 1, 1992; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc1070975/m1/4/: accessed April 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.