Plasma torch for the treatment of gases and/or particles and for

Details Plasma torch for the treatment of gases and/or particles and for Plasma torch for the treatment of gases and/or particles and for

1992-12-01

1994-03-29

Paschall, Mark H.

Electric heating

Metal heating

By arc

21912147, 219 7616, 21912152, 118308, B23K 900

Patent

active

052987140

ABSTRACT:
A plasma torch for the treatment of gases of particles, or for the deposition of particles onto a substrate, which has two concentrical electrodes coaxially mounted onto a support. The gases or particles to be treated or deposited are injected through an injection passage that is coaxial with the central electrode and opens centrally into an outlet nozzle so as to inject the gases or particles centrally and coaxially within the center of the flame torch without unduly affecting the characteristics of the plasma. In use, the central electrode extends well downstream of the peripheral electrode, whereby the electric arc may not block the injection passage. Moreover, a magnetic field is generated externally to the electrodes in the direction parallel to the annular passage defined between the electrodes in order to rotate the electric arc within the passage and thus reduces the erosion of the electrodes while ensuring better heating of the plasma gas.

REFERENCES:
patent: 4242562 (1980-12-01), Karinsky et al.
patent: 4683367 (1987-07-01), Drouet
patent: 4847466 (1989-07-01), Pasquini et al.
patent: 4964568 (1990-10-01), Rotolico et al.
patent: 5148986 (1992-09-01), Rusch
Marantz, "Electromagnetically Coalesced Multi-Arc Plasma Torch with True Axial Powder Feed," Proceedings of the Third National Thermal Spray Conference, May 25, 1990, pp. 443-449.
Arata, "New Technology for Processing and Evaluating Thermal Sprayed Coatings," Welding Research Institute of Osaka University, undated article, pp. 309-311.
Britton, "Improved Coating Performance by the Advanced Plasma Gun System (APGS)," undated article, pp. 71-80.

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