Multiple torch type plasma spray coating method and...

Details Multiple torch type plasma spray coating method and... Multiple torch type plasma spray coating method and...

C - Chemistry, Metallurgy

23

C

117/53, 32/60

C23C 4/00 (2006.01) B05B 7/22 (2006.01) B05D 1/08 (2006.01) C23C 4/12 (2006.01) H05H 1/36 (2006.01) H05H 1/42 (2006.01) H05H 1/44 (2006.01)

Patent

CA 1298146

Abstract A multiple torch-type plasma spray-coating method and a multiple torch type plasma spray-coating apparatus, are characterized in that a main torch and an auxiliary torch are disposed so that their center axes intersect each other. By fixing the starting and end points of arc through the use of multiple torches so disposed, improved laminar flow plasma is generated by the main torch. Spray-coating material is charged into the plasma flame in the proximity of the outlet of the main plasma torch, the plasma flame is blown onto an object to be treated, the plasma is separated from the plasma flame just in front of the object to be treated, and the spray-coating material is deposited onto the object to be treated, thereby avoiding damage which would occur if plasma were permitted to impinge directly onto the substrate.

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