PURPOSE: To increase purity of a film and further to eliminate an electric breakdown by insulating space, having a supply port of flame spraying material and its flame spraying port in both ends, formed between a bar-shaped center electrode and a cylindrical electrode arranged coaxially with this center electrode in the periphery.
CONSTITUTION: A center electrode 2 of anode, formed in a bar shape with a circular section to form a diameter so as to gradually contract from one end to the other end, is coaxially inserted into a cylindrical electrode 3 of cathode formed gradually thicker from one end to the other end so as to go along this center electrode. Here, space S between both the electrodes is formed so as to be narrowed continuously toward a side of a flame spray port 7 from a side of a flame spray material supply port 3a provided in both ends of this space S. The electrode 3 is supported by insulators 6 in fixed height in a lateral direction so as to hold the space S. A material 4a, formed into plasma as an armature, is flame-sprayed to form a circular film on a processed body 10. Here by insulating with the space S, an insulating material is prevented from mixing in and sticking to the film, to decrease also generating a restrike.
SHIGEYAMA KAZUKI
IKEDA CHIKAYUKI
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