SINGLE TORCH-TYPE PLASMA SPRAY COATING METHOD AND APPARATUS THEREFOR

摘要

A single torch-type plasma spray coating method wherein a gas flow in a nozzle of a plasma torch is made to be a laminar flow, thereby the plasma flame jetted from the end of the plasma torch is modified to be a laminar flow flame. The plasma is separated from the plasma flame which contains liquid droplets of molten spray coating material and runs toward an object to be worked by means for separating plasma arranged immediately before said object to be worked. The remaining droplets of molten spray coating material impinge on said object to form a coating film thereon. This arrangement allows a low flow rate of plasma gas to be used and this reduces the intensity of the noise emitted by the method and allows low strength or delicate substrates to be coated.