Feasibility study on effective utilizing methods of Nachiguro stone powder

－In the case of using the thermal spraying－

Abstract

Nachiguro stone is a rock that is mined in Kamikawa-cho Kumano City, in Mie Prefecture . The rock is black in color and has a smooth texture. It is processed mainly in goishi and suzuri. At the time of processing, a large amount of powder is created. The powder is not often utilized. In the present study, a coating on the base material was produced by using powder-type flame thermal spraying. From the experimental results, the Nachiguro sprayed coating was discolored from black to brown. Discoloring is due to oxidation. In future experiments, it is necessary to investigate the state of the powder.