Abstract
The boride cermet composed with M3B2 (M: metal)-system complex borides and metals have attained superiority over carbide cermets in various mechanical properties. However, their sintered materials have put into only the limited uses due to the cost. Therefore, two sorts of the boride cermet coating have been developed. Thermal spray coating of the boride cermet was investigated. The sprayed powder was prepared by low temperature sintering, and the spraying was performed by HVOF. Microstructure of the sprayed layer was finer, and its hardness was superior than sintered body in vacuum having the same compositions. Overlay of the boride cermet was investigated using sintered powder. Plasma transfer arc was selected as a welding method. The suitable compositions were not same between overlay and thermal spraying owing to the deference of provided heat in process.
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