Pressure-dependent electron attachment rates in perfluoroalkanes and perfluoropropylene (1-C/sub 3/F/sub 6/) and their effect on the breakdown strength of these gases

Conference · Fri Jan 01 04:00:00 EST 1982

OSTI ID:5287760

Hunter, S R; Christophorou, L G; James, D R; Mathis, R A

The pressure dependence of the attachment rate constant of several perfluoroalkane dielectrics has been studied in buffer gases of N/sub 2/ and Ar up to a total pressure of 2.4 MPa. It has been observed that the higher order perfluoroalkanes (n-C/sub N/F/sub 2N+2/; 3 less than or equal to N less than or equal to 6) exhibit a marked dependence of their attachment rate constant on the total gas pressure, particularly in the pressure range from 53 kPa to approx. 700 kPa in N/sub 2/ over a mean energy range of from thermal energy to approx. = 1 eV, and in Ar over the energy range from approx. = 0.3 eV to approx. = 4.5 eV. A considerably larger total pressure dependence has been observed for 1-C/sub 3/F/sub 6/ in N/sub 2/ and Ar, which does not saturate, even at the highest buffer gas pressures (3.2 MPa). A partial pressure dependence of the attachment rate on 1-C/sub 3/F/sub 6/ has also been observed in these mixtures, which may saturate above approx. 15 kPa, indicating that the attachment process involves the interaction of two or more 1-C/sub 3/F/sub 6/ molecules. Breakdown measurements have been performed in 1-C/sub 3/F/sub 6/ using uniform field electrodes and in mixtures of 1-C/sub 3/F/sub 6//N/sub 2/ and 1-C/sub 3/F/sub 6//SF/sub 6/ using point-plane electrodes. These measurements have been performed over the total pressure range 25 to 600 kPa. The dc breakdown strength of 1-C/sub 3/F/sub 6/ is dependent on the total gas pressure after allowing for the effect of compressibility of the gas. Our attachment and breakdown measurements for these gases and gas mixtures are reported and discussed.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 5287760
• Report Number(s): CONF-820331-2; ON: DE82008848
• Country of Publication: United States
• Language: English

Related Subjects

200302 -- Power Transmission & Distribution-- DC Systems-- (1989-)
24 POWER TRANSMISSION AND DISTRIBUTION
36 MATERIALS SCIENCE
360603 -- Materials-- Properties
640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
AROMATICS
BREAKDOWN
COLLISIONS
DATA
DC SYSTEMS
DIELECTRIC MATERIALS
ELECTRIC POTENTIAL
ELECTRON ATTACHMENT
ELECTRON COLLISIONS
ELECTRON-MOLECULE COLLISIONS
ENERGY RANGE
ENERGY SYSTEMS
EV RANGE
EV RANGE 01-10
EXPERIMENTAL DATA
FLUORINATED ALIPHATIC HYDROCARBONS
FLUORINATED AROMATIC HYDROCARBONS
HALOGENATED ALIPHATIC HYDROCARBONS
HALOGENATED AROMATIC HYDROCARBONS
HVDC SYSTEMS
INFORMATION
MATERIALS
MOLECULE COLLISIONS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
POWER SYSTEMS
PRESSURE DEPENDENCE