TiN-TiB2 composite coatings reactively produced by electrothermally exploded powder spray |
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Authors: | Hideki Tamura Fu-Gao Wei Takahiko Kodama |
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Affiliation: | (1) Department of Materials Science and Engineering, Tokyo Institute of Technology, Nagatsuta 4259, Midori, 226-8502 Yokohama, Japan |
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Abstract: | Composite coatings composed of titanium nitride, TiN, and diboride, TiB2, were reactively produced by the electrothermally exploded powder spray technique, in which feedstock powder was prepared
from titanium and boron nitride particles. The microstructure of the coating was composed of titanium-ceramic particles the
size of which were on the order of several nanometers to a few hundred nanometers. Such reactive thermal spraying brought
base-metal saturation into a coating layer at the early stages of coating formation. The ceramic composite spray using feedstock
of TiN and TiB2 particles preferentially brought a new phase of cubic titanium boronitride together with TiN and TiB2 into a coating. On comparing such a coating to one produced by the conventional method, the reactive thermal spray coating
was richer in TiN and TiB2 due to the excess nitrogen in the feedstock. |
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Keywords: | composite coating electrothermal explosion metal saturation reactive thermal spray titanium boride titanium nitride |
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