| 摘要 |
An object of the present invention is to improve the quality of surface treatment and to enhance the work efficiency . The gas ( 6 ) to be sprayed onto the surface of a treatment object ( 15 ) is heated and made into a plasma by a heating means ( 5 ) and thus enters a highly reactive state (excited state, activated state). The gas that has been heated and made into a plasma is then subjected to adiabatic expansion by a rubber nozzle ( 1 ), which results in a flow rate faster than the speed of sound. This gas (7) that has been given the flow rate faster than the speed of sound is then sprayed toward the surface of the treatment object (15). Thereupon, the gas (7) that has been heated and made into a plasma and has entered a highly reactive state reaches the treatment object (15), which is the spraying object, at ultrasonic speed in a short time.
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