Electrical resistivity of plasma-sprayed titanium diboride coatings
P. V. ANANTHAPADMANABHAN, K. P. SREEKUMAR, P. V. RAVINDRAN
JOURNAL OF MATERIALS SCIENCE
abstract:Plasma-sprayed TiB 2 coatings (50-600 pm thick) on alumina substrates have been developed and characterized. X-ray diffraction studies, thermal analysis and oxygen analysis of the coatings show that there is appreciable oxidation of TiB 2 during the spray process. Partial oxidation of the boride during spraying strongly influences the electrical conductivity of the coatings, which is found to be 100-1000 times less than that of pure TiB2. Although use of argon as shield gas during the spray process brings down the resisitivity substantially, partial oxidation of TiB2 could not be totally avoided.
keywords:Chemistry Division; oxygen analysis; Partial oxidation; Plasma Technology; spray process; argon as shield; sintered TiB
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