| 摘要 |
A plasma spray apparatus for spraying powdery or gaseous material comprises an indirect plasmatron to create an elongated plasma torch. The plasmatron comprises at least one, preferably three cathode members, an annular anode member located distantly from the cathode members and a plasma channel extending from the cathode members to the anode member. The plasma channel is delimited by a plurality of annular neutrode members which are electrically insulated from each other. For axially feeding the powdery or gaseous material into the plasma torch a supply tube is provided which is located close to the cathode member at the beginning of the plasma channel. The plasma channel has a first zone with a reduced diameter located in that region of the plasma torch which is near to the cathode member and a second zone with increased diameter located between the first zone with a reduced diameter and the anode member.
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