Analytical and experimental studies for thermal plasma processing of materials
Work continued on thermal plasma processing of materials. This quarter, ceramic powders of carbides, aluminium nitride, oxides, solids solutions, magnetic and non magnetic spinels, superconductors, and composites have been successfully synthesized in a Triple DC Torch Plasma Jet Reactor (TTPR) and in a single DC Plasma Jet Reactor. All the ceramic powders with the exception of AIN were synthesized using a novel injection method developed to overcome the problems associated with solid injection, in particular for the single DC plasma jet reactor, and to realize the benefits of gas phase reactions. Also, initial experiments have been performed for the deposition of diamond coatings on Si wafers using the TTPR with methane as the carbon source. Well faceted diamond crystallites were deposited on the surface of the wafers, forming a continuous one particle thick coating. For measuring temperature and velocity fields in plasma systems, enthalpy probes have been developed and tested. The validity has been checked by performing energy and mass flux balances in an argon plasma jet operated in argon atmosphere. Total Gibbs free energy minimization calculations using a quasi-equilibrium modification have been applied to simulate several chemical reactions. Plasma reactor modelling has been performed for the counter-flow liquid injection plasma synthesis experiment. Plasma diagnostics has been initiated to determine the pressure gradient in the coalesced part of the plasma jet. The pressure gradient drives the diffusion of chemical species which ultimately controls the chemical reactions. 4 figs.
- Research Organization:
- Minnesota Univ., Minneapolis, MN (USA). Dept. of Mechanical Engineering
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- FG02-85ER13433
- OSTI ID:
- 6456969
- Report Number(s):
- DOE/ER/13433-T1; ON: DE91000599
- Country of Publication:
- United States
- Language:
- English
Similar Records
Thermal plasma processing of materials
Probe measurements in argon plasma jets operated in ambient argon
Related Subjects
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360601 -- Other Materials-- Preparation & Manufacture
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM NITRIDES
ALUMINIUM OXIDES
CARBIDES
CARBON
CARBON COMPOUNDS
CERAMICS
CHALCOGENIDES
COATINGS
DEPOSITION
DIAMONDS
DISPERSIONS
DOCUMENT TYPES
ELEMENTAL MINERALS
ELEMENTS
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MINERALS
MIXTURES
NITRIDES
NITROGEN COMPOUNDS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PLASMA
PLASMA JETS
PNICTIDES
POWDERS
PROGRESS REPORT
SOLID SOLUTIONS
SOLUTIONS
SUPERCONDUCTORS
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM CARBIDES
ZIRCONIUM COMPOUNDS