Paper Title:
Plasma Characteristics of Supersonic Nitrogen/Hydrogen-Mixture and Ammonia Plasma Jets and Nitrided Material Properties
  Abstract

Spectroscopic and electrostatic probe measurements were made to examine plasma characteristics under nitriding for a 10-kW-class direct-current arc plasma jet generator with a supersonic expansion nozzle in a low pressure environment. Heat fluxes into the plate from the plasma were also evaluated. Ammonia and mixtures of nitrogen and hydrogen were used as the working gas. The H-atom electronic excitation temperature and the N2 molecule-rotational excitation temperature intensively decreased downstream in the nozzle although the NH molecule-rotational excitation temperature did not show an axial decrease. As approaching the titanium plate, the thermodynamical nonequilibrium plasma came to be a temperature-equilibrium one. Both the electron number density near the plate and the heat flux increased with H2 mole fraction for mixtures gases. In cases with mixtures of N2 and H2, a radical of NH with a radially wide distribution is considered to contribute to the better nitriding as a chemically active and non heating process.

  Info
Periodical
Materials Science Forum (Volumes 449-452)
Edited by
S.-G. Kang and T. Kobayashi
Pages
373-376
DOI
10.4028/www.scientific.net/MSF.449-452.373
Citation
H. Tahara, Y. Ando, T. Yoshikawa, "Plasma Characteristics of Supersonic Nitrogen/Hydrogen-Mixture and Ammonia Plasma Jets and Nitrided Material Properties", Materials Science Forum, Vols. 449-452, pp. 373-376, 2004
Online since
March 2004
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Sung Tag Oh, Se Joong Yoon
Abstract:The reduction behavior of Al2O3/CuO powder mixtures, prepared from Al2O3/CuO or Al2O3/Cu-nitrate, was investigated by using thermogravimetry...
181
Authors: S. David, Khellil Sefiane, Martin E.R. Shanahan
Abstract:The wetting and evaporation behaviour of methanol-water droplets deposited on a smooth silicon substrate were investigated experimentally....
469
Authors: Sergio Luiz Mineiro, Maria do Carmo de Andrade Nono
Abstract:The densification behavior of mixtures of nanocrystalline and conventional microcrystalline zirconia powders undergoing uniaxial pressing...
504
Authors: Ying Bai Xie, Shao Heng Wang, Bing Li, Yun Liu
Abstract:To improve the overall performance of the VM cycle pump. Based on the mixture with nitrogen (including N2 - Ne, N2 - Ar, and N2 - Kr) by...
249
Authors: Kang Li, Wen Hao Niu, Guo Qiang Zhang
Abstract:C4F8/N2 gas mixtures are possible substitutes for SF6, because of its good insulation...
1499