A mass spectrometric study of the neutral and positive ionic species involved in carbon deposition from r.f. discharges in carbon containing gases

Evans, H.E.; Jennings, P. P.

doi:10.1016/0008-6223(68)90014-6

Cited by 10 publications

(4 citation statements)

References 9 publications

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“…Similar ion distributions have been found in mass spectrometry sampling of methane discharges29•30 and discharges in methanecarbon monoxide mixtures. 31 The observed ion distribution is not related to the final products in any simple manner.…”

Section: Resultsmentioning

confidence: 88%

Mass spectrometry study of microwave discharges in hydrogen-carbon monoxide-argon mixtures

Lett¹,

Steiner²,

Fu³

1972

J. Phys. Chem.

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Publication costs assisted by the V. S, Bureau of Mines Microwave discharges in a flow system containing hydrogen-carbon monoxide-argon mixtures have been sampled by a time-of-flight mass spectrometer. Depending upon experimental conditions, from to 30% of the carbon monoxide was converted to methane, acetylene, and carbon dioxide. The formation, of the major gaseous products was studied as a function of reactant gas composition, pressure, microwave power, and flow rate. The consumption of carbon monoxide appears to be first order at short residence times. Ions were sampled from the discharges at pressures below 5 Torr. The most abundant ions were H50+, HCO+, and primarily hydrocarbon ions in the C2, C3, and C4 regions.

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Section: Resultsmentioning

confidence: 88%

Mass spectrometry study of microwave discharges in hydrogen-carbon monoxide-argon mixtures

Lett¹,

Steiner²,

Fu³

1972

J. Phys. Chem.

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“…When arc discharge occurs between the contact strip and the contact wire, the density of the energy of arc discharge can reach up to 10 2 –10 4 J/cm 2 and the surface flash temperature of arc can reach up to thousands of degrees. 32–36 Though the carbon fibers of the pure carbon strip are not melted at such a high temperature, they can be sublimated at the temperature above 3800 K. 36 The high temperature leads to vaporization of the carbon strip material to produce gasified carbon, which enters into the arc to form different compounds. When the arc disappears or moved to another place, the compounds may be deposited on the surface of the contact wire, as shown in Figure 7(g) and (h).…”

Section: Discussionmentioning

confidence: 99%

Study on material transfer in the process of contact strips rubbing against a contact wire with electric current

Chen

Gao

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part J:

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A series of experimental tests on a block-on-ring tester were carried out to obtain a new understanding of severe material transfer in the process of contact strips rubbing against a contact wire with electric current. Three types of contact strip materials including an aluminum-based strip, a copper-based strip, and a pure carbon strip are tested in electric sliding against two contact wire materials including a pure copper contact wire and a copper–silver alloy contact wire. Test results show that there are serious material transfers in these three different friction couples in electric sliding. The aluminum-based strip has the severest material transfer, followed by the copper-based strip. The pure carbon strip has the minimum material transfer. It is found that the material transfer increases with the increase of the sliding speed, the arc discharge intensity, and the contact pressure. In the presence of electric current, contact strip materials are always transferred to the contact wire.

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“…Free radicals or hydrocarbon ions are formed in discharges containing hydrocarbon vapour impurities, which can also lead to the growth of organic deposits on exposed solid surfaces (Linder and Davies 1931, Harkins 1934, Evans and Jennings 1968. The resistivities of such layers are often in excess of los Cl cm-2 (Poole 1953, Christy 1960).…”

Section: Growth Of Dielectric Layersmentioning

confidence: 99%

Dielectric impurities and surface instability in Langmuir probe plasma measurements

D'Arcy

1974

J. Phys. D: Appl. Phys.

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A mass spectrometric study of the neutral and positive ionic species involved in carbon deposition from r.f. discharges in carbon containing gases

Cited by 10 publications

References 9 publications

Mass spectrometry study of microwave discharges in hydrogen-carbon monoxide-argon mixtures

Mass spectrometry study of microwave discharges in hydrogen-carbon monoxide-argon mixtures

Study on material transfer in the process of contact strips rubbing against a contact wire with electric current

Dielectric impurities and surface instability in Langmuir probe plasma measurements

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