| 摘要 |
PURPOSE:To form a thermally sprayed dense film while improving the fluidity of pulverous powder and eliminating bridging by incorporating pulverous powder having the diameter smaller than the diameter of said pulverous powder at a proper ratio into the pulverous powder and supplying the power mixture to a thermal spraying torch. CONSTITUTION:The amorphous pulverous powder 12 having the grain size smaller than the grain size of the pulverous powder 10 for gas spraying is incorporated into said pulverous powder. Amorphous silica, amorphous alumina, etc., having approximately a spherical shape are used for the powder 12. The powder 12 interposes in the space of the powder 10 to lessen the bite of the acute angles of the powder 10 against each other. The powder 12 rolls when the powder 10 is supplied into the gas spraying torch. The bite of the acute angles of the powder 10 against each other is minimized by such bearing effect, by which the bridging is thoroughly eliminated. Uniform film having no variance in the thickness is thus formed. |
