Abstract
In this thesis a novel preparation technique for the fabrication of homogeneous single-phase nitride layers in iron is presented. This technique consists of a double implantation scheme. First a N (pre-) implantation, at an energy of a few hundred keV and at a low substrate temperature, is performed to nucleate nitride particles in the near-surface region. Then the specimen temperature is raised to 300 degree C and N is implanted at 1 MeV such that the N comes to rest in the Fe substrate at the back side of the preimplanted region. At this temperature N rapidly diffuses in the F matrix; hence, if it arrives at a pre-existing nitride particle, this is enabled to grow. closed {gamma}`-Fe{sub 4}N layers result which grow at the substrate side for higher N fluences. Although these layers are buried under the surface, it is expected that by optimizing the implantation conditions, or even with a combination of implantation and thermochemical techniques, {mu}m thick surface layers can be achieved. This thesis aims, first, to present a large body of experiments with the purpose of establishing the conditions under which nitride layers in Fe can be fabricated. Further, it addresses the role of phase formation,
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Citation Formats
Vredenberg, A M.
Ion beam synthesis of nitride layers in iron.
Netherlands: N. p.,
1991.
Web.
Vredenberg, A M.
Ion beam synthesis of nitride layers in iron.
Netherlands.
Vredenberg, A M.
1991.
"Ion beam synthesis of nitride layers in iron."
Netherlands.
@misc{etde_10111299,
title = {Ion beam synthesis of nitride layers in iron}
author = {Vredenberg, A M}
abstractNote = {In this thesis a novel preparation technique for the fabrication of homogeneous single-phase nitride layers in iron is presented. This technique consists of a double implantation scheme. First a N (pre-) implantation, at an energy of a few hundred keV and at a low substrate temperature, is performed to nucleate nitride particles in the near-surface region. Then the specimen temperature is raised to 300 degree C and N is implanted at 1 MeV such that the N comes to rest in the Fe substrate at the back side of the preimplanted region. At this temperature N rapidly diffuses in the F matrix; hence, if it arrives at a pre-existing nitride particle, this is enabled to grow. closed {gamma}`-Fe{sub 4}N layers result which grow at the substrate side for higher N fluences. Although these layers are buried under the surface, it is expected that by optimizing the implantation conditions, or even with a combination of implantation and thermochemical techniques, {mu}m thick surface layers can be achieved. This thesis aims, first, to present a large body of experiments with the purpose of establishing the conditions under which nitride layers in Fe can be fabricated. Further, it addresses the role of phase formation, precipitation, phase transformation, diffusion, and beam-induced effects on the formation, growth and stability of {gamma}` layers. Finally, it discusses these results in terms of the thermodynamics and kinetics of the experimentally identified processes. (author). 74 refs.; 33 figs.; 5 tabs.}
place = {Netherlands}
year = {1991}
month = {Jun}
}
title = {Ion beam synthesis of nitride layers in iron}
author = {Vredenberg, A M}
abstractNote = {In this thesis a novel preparation technique for the fabrication of homogeneous single-phase nitride layers in iron is presented. This technique consists of a double implantation scheme. First a N (pre-) implantation, at an energy of a few hundred keV and at a low substrate temperature, is performed to nucleate nitride particles in the near-surface region. Then the specimen temperature is raised to 300 degree C and N is implanted at 1 MeV such that the N comes to rest in the Fe substrate at the back side of the preimplanted region. At this temperature N rapidly diffuses in the F matrix; hence, if it arrives at a pre-existing nitride particle, this is enabled to grow. closed {gamma}`-Fe{sub 4}N layers result which grow at the substrate side for higher N fluences. Although these layers are buried under the surface, it is expected that by optimizing the implantation conditions, or even with a combination of implantation and thermochemical techniques, {mu}m thick surface layers can be achieved. This thesis aims, first, to present a large body of experiments with the purpose of establishing the conditions under which nitride layers in Fe can be fabricated. Further, it addresses the role of phase formation, precipitation, phase transformation, diffusion, and beam-induced effects on the formation, growth and stability of {gamma}` layers. Finally, it discusses these results in terms of the thermodynamics and kinetics of the experimentally identified processes. (author). 74 refs.; 33 figs.; 5 tabs.}
place = {Netherlands}
year = {1991}
month = {Jun}
}