A torch nozzle design to improve plasma spraying techniques
Authors: Cao M.1; Gitzhofer F.1; Gravelle D.V.1; Henne R.2; Boulos M.I.1
Source: Plasma Sources Science and Technology, Volume 6, Number 1, 1997 , pp. 39-45(7)
Publisher: Institute of Physics Publishing
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Abstract:
The effects of nozzle design on the plasma characteristics of supersonic flow conditions are investigated using a D.C. plasma jet under low-pressure plasma spraying conditions. Comparison is made between a 5 mm I.D. standard nozzle and a 13 mm E.D. (exit diameter) Mach 3 Laval nozzle. Emission spectroscopy is used to study the temperature and electron density distributions in the plasma jets produced by the different nozzle configurations. The effects of the observed modifications of the temperature and electron density fields on the properties of the plasma sprayed deposits are studied using Rene 80 powders which are sprayed using both types of nozzle under similar operating conditions. The results show that the M3 Laval nozzle provides a better spraying efficiency and spraying density than a standard anode nozzle under similar conditions.
Language: English
Document Type: Miscellaneous
Affiliations: 1: Plasma Technology Research Centre (CRTP), University of Sherbrooke, Quebec J1K 2R1, Canada 2: DLR-Institute for Technical Thermodynamics, Stuttgart, Germany
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