Electric heating – Metal heating – By arc
Patent
1991-04-12
1993-04-06
Paschall, Mark H.
Electric heating
Metal heating
By arc
21012149, 21012148, 31511151, B23K 900
Patent
active
052005950
ABSTRACT:
A high performance induction plasma torch comprises a cylindrical torch body made of cast ceramic or composite polymer, a coaxial cylindrical plasma confinement tube located inside the torch body, a gas distributor head secured to one end of the torch body to supply the confinement tube with gaseous substances, a cylindrical and coaxial induction coil completely embedded in the ceramic or polymer material of the torch body, and a thin annular chamber separating the coaxial torch body and confinement tube. This confinement tube can be made of pure or composite ceramic materials based on sintered or reaction bonded silicon nitride, boron nitride, aluminum nitride or alumina, or any combinations of them with varying additives and fillers. The annular chamber is about 1 mm thick and high velocity cooling water flows therein to efficiently cool the plasma confinement tube.
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A radioactively cooled torch for ICP-AES using 1 1 min-1 of argon van der Plas et al. Spectrochimica Acta vol. 39B Nos. 9-11, pp. 1161-1169 1984.
An evaluation of ceramic materials for use in non-cooled low-flow ICP torches, van der Plas et al., Spectrochimica Acta vol. 42B Nos. 11-12, p. 1205-1216 1987.
Boulos Maher I.
Jurewicz Jerzy
Paschall Mark H.
Universite de Sherbrooke
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