| 摘要 |
PURPOSE:To enhance anti-corrosion characteristic by providing a particular alloy layer sprayed at a low pressure to the surface of basic material. CONSTITUTION:A layer consisting of Cr, Cr-Fe or TiN sprayed at a low pressure is formed on the surface of basis material. The plasma is generated by supplying Argon gas into the arc 27 form the operation gas supply device 17 and a voltage is also applied across a nozzle 8 and a cooling base material 25. Thereby, the plasma jet 29 is sprayed toward the surface of cooling base material from the nozzle 8. Under this condition, the power of a raw material of the jar is supplied to the nozzle 8 from the supply hole 9. Particles of powder of jar material sprayed into the nozzle 8 becomes fine melted drops by the heat of plasma and it is accumulated on the surface of cooling base material 25 and the accumulated drops are condensed and thereby a cylindrical mold 31 is formed at the surface of cooling base material. Since the cathode jar is formed by plasma spraying within a low pressure ambience, comparatively economical material having excellent anti-corrosion characteristic can be used. |
