| 摘要 |
<p>PURPOSE: To make it possible to form a dense and tenacious thermal spray coating film at high speed by disposing a combustion gas injection means, outer injection means of a compressible incombustible gas, a supply means of spray powder and an inner gas injection means of the compressible incombustible gas. CONSTITUTION: This gun is provided with combustion gas means 50, 52, 53 for injecting the annular flow of a combustible mixture composed of a combustion gas and oxygen coaxially from a nozzle member 54 under the pressure in a combustion chamber 82 higher by at least two bar than the atm. pressure into the combustion chamber 82. The gun is also provided with outer gas means 70 to 72 for injecting the annular outer flow of the compressed incombustible gas on the outer side of the annular flow of the combustible mixture viewed in a radial direction adjacently to the wall of a cylindrical shape. Further, a means 62 for supplying the thermally meltable thermal spray powder in a carrier gas into the combustion chamber 82 near an axial line 63 is disposed. The gun is provided with the inner gas injection means 91 for injecting the annular inner flow of the compressed incombustible gas between the combustion mixture and the power carrier gas coaxially into the combustion chamber 82 from the nozzle member 54.</p> |
