Reactive thermal spray by high velocity ceramic jet and characterization of the coatings |
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Authors: | T Kodama Y Ikeda H Tamura |
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Affiliation: | (1) Department of Materials Science and Engineering, Tokyo Institute of Technology, Nagatsuta 4259, Midori-ku, 226-8502 Yokohama, Japan |
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Abstract: | A ceramic jet composed of molten particles in an electrothermally exploded powder spray was identified by the flash, soft
x-ray radiography technique. The velocity of the leading edge of the jet was estimated to be 900 m/s. The coating obtained
by a ceramic jet of titanium diboride consisted of a mixing layer of the substrate material and sprayed ceramics. A coating,
which exhibited no pores or cracks, was formed through the dense deposition and solidification of spray droplets. The successive
impacts of the droplets caused melting and stirring of the substrate surface to form a mixing layer. Some of these layers
were formed due to capillary movement of the molten substrate material into the fractures of coarse ceramic particles. Thermal
spray by chemical reaction between titanium and boron nitride particles resulted in a composite coating of TiN and TiB2. The character of the mixing layer indicated that the depth profiles depended on the substrate material. |
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Keywords: | ceramic jet electrothermal explosion microstructure reactive thermal spray titanium boride titanium nitride |
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