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La SDL (Spectrométrie à Décharge Luminescente) est une technique bien connue pourl’analyse élémentaire et le suivi de profils en profondeur des métaux, mais son prix rendbien souvent inabordable son utilisation pour le contrôle des procédés de traitementthermique. HORIBA Scientific a conçu un instrument de Spectrométrie à DéchargeLuminescente – le GD-PROFILER HTP – dédié au contrôle des procédés de traitement thermiqueet proposé à un prix accessible. Ce GD-PROFILER HTP donne les profils en profondeur de C,N (et O) et des autres éléments permettant de valider le traitement thermique effectué, ildonne aussi très rapidement la composition complète des matériaux avant traitement,permettant de contrôler l’alliage reçu. En raison de la durée rapide d’analyse (quelquesminutes), le GD-PROFILER HTP est l’outil de choix pour repérer les écarts au procédénominal et apporter les corrections nécessaires. Des exemples pratiques seront présentésmontrant l’utilisation du GD PROFILER HTP pour le : – contrôle des matériaux entrants; –contrôle des produits finaux, après traitement thermique; – contrôle du procédé detraitement thermique.
High-current electron beams with a current density of up to
100 A/cm2 generated by a plasma-cathode gas-filled
diode at low accelerating voltages are studied. Two types of gas
discharges are used to produce plasma in the cathode. With glow
and arc discharges, beam currents of up to 150 A and 400 A, respectively,
have been obtained at an accelerating voltage of 16 kV and at a
pressure of 1–3·10−2 Pa in the acceleration
gap. The ions resulting from ionization of gas molecules by electrons
of the beam neutralize the beam charge. The charge-neutralized electron
beam almost without losses is transported over a distance of 30 cm in a
drift channel which is in the axial magnetic field induced by Helmholtz
coils. The results of calculations for the motion of electrons of the
charge-neutralized beam with and without axial external field
are presented and compared with those of experiments.
The results on study of light sources based on spontaneous
radiation of molecules KrCl* (λ ∼ 222 nm) and XeCl*
(λ ∼ 308 nm) excited by a glow discharge are presented.
It is demonstrated that additions of light inert gases (He and
Ne) lead to increase in emission of radiation power and efficiency
in mixtures Kr(Xe)-Cl2. A high-power cylindrical
multi-section excilamp was built and energy, time, and spectrum
characteristics have been studied. Average output power obtained
in the UV spectral range were 1,9 kW at λ ∼ 222 nm and
1,1 kW at λ ∼ 308 nm with efficiencies with respect
to the excitation power of up to 14%.
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