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Article Dans Une Revue Journal of Physics D: Applied Physics Année : 2007

Kinetic modelling of a N-2 flowing microwave discharge with CH4 addition in the post-discharge for nitrocarburizing treatments

Résumé

A kinetic study is conducted to investigate the elementary processes scheme that produces methane decomposition as a small percentage of this gas is introduced downstream in the flowing afterglow of a nitrogen microwave discharge. For this purpose a self-consistent kinetic model is used for the discharge and corresponding afterglow including, besides the species associated with active nitrogen, such as vibrationally excited N-2(X (1)Sigma(+)(g), v) molecules, N-2(A(3)Sigma(+)(u)) and N-2(a' (1)Sigma(-)(u)) metastables and N(S-4) atoms, various hydrocarbons formed from methane decomposition, and other species produced in nitrogen-methane reactions. It is observed that CH4 is primarily dissociated in CH3 and CH2 in collisions with N-2(A), the stable hydrogen cyanide molecule HCN is formed at an intermediate stage of the process, HCN and CH2 give place to the formation of CN(X (2)Sigma(+)), and ultimately C atoms are produced by collisions of CN(X) with N atoms. The predicted concentrations so obtained are compared with experimental determinations of N and C atoms and of N-2(B (3)Pi(g)) and CN(B (2)Sigma(+)) states, these latter obtained from spectroscopic measurements.

Dates et versions

hal-00175919 , version 1 (01-10-2007)

Identifiants

Citer

C.D. Pintassilgo, Cédric Jaoul, J. Loureiro, T. Belmonte, T. Czerwiec. Kinetic modelling of a N-2 flowing microwave discharge with CH4 addition in the post-discharge for nitrocarburizing treatments. Journal of Physics D: Applied Physics, 2007, 40, pp.3620-3632. ⟨10.1088/0022-3727/40/12/011⟩. ⟨hal-00175919⟩
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