Synthesis of Al_2O_3-AlN Coatings by Low Pressure Plasma Spraying and Nitriding(Physics, Process, Instrument & Measurements)

概要

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AlN has some attractive properties for many applications including high thermal conductivity and a lower thermal expansion. The formation of AlN coating was not seen through the reaction of Al powder with N_2 atmosphere by LPPS in N_2 atmosphere. In order to form Al_2O_3-AlN composite coatings Al_2O_3-Al and Al_2O_3-C composite coatings obtained by low pressure plasma spraying, were heated at high temperature in an N_2 atmosphere. For the direct nitridation of Al in Al_2O_3-Al coatings, AlN contents in coatings increased with the increase of heating temperature and time. When the carbothermal reduction of Al_2O_3-C composite coatings was carried out in N_2 atmosphere, the formation of AlN in Al_2O_3-C coatings was depended greatly on the existence of C powders on the surface of Al_2O_3-C coatings during heat-treatment.
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