FORMATION OF TIB2 DEPOSIT AND TIB2 DEPOSIT

摘要

PURPOSE:To stably form TiB2 deposit on the surface of a substrate having high hardness and excellent in wear resistance, at the time of forming TiB2 deposit on the surface of a substrate by plasma thermal spraying, by executing the thermal spraying in such a manner that the place of the tip of a thermal spraying nozzle is set to a one with a specified distance from the surface of the substrate. CONSTITUTION:The tip 11a of a thermal spraying nozzle of a plasma gun 11 is set on the surface of the substrate 16 to be treated in such a manner that the distance at which Ti powder 1 to be thermal-sprayed is not at all exposed to the air. A plasma gas is fed from a feeding apparatus 14 as well as the Ti powder 1 coated with B powder 2 is fed to the surface 1a, and Ti and B are thermal-sprayed on the surface of the substrate 16. Ti and B are formed into TiB2 by self exothermic reaction to form a plasma sprayed deposit contg. =5wt.% Ti simple substance and TiO2 on the surface, consisting essentially of TiB2 and having high hardness and excellent wear resistance.