Correlations between active species density and iron nitride layer growth in Ar-N2-H2microwave post-discharges

1994 ◽  
Vol 27 (6) ◽  
pp. 1328-1332 ◽  
Author(s):  
H Malvos ◽  
H Michel ◽  
A Ricard
Keyword(s):  
Nitride Layer ◽  
Active Species ◽  
Layer Growth ◽  
Species Density ◽  
Iron Nitride

Ion beam synthesis of nitride layers in iron

1992 ◽  
Vol 7 (10) ◽  
pp. 2689-2712 ◽  
Author(s):  
A.M. Vredenberg ◽  
C.M. Pérez-Martin ◽  
J.S. Custer ◽  
D.O. Boerma ◽  
L. de Wit ◽  
...  
Keyword(s):  
Ion Beam ◽  
High Energy ◽  
Nitride Layer ◽  
Layer Growth ◽  
Stable Phase ◽  
Iron Nitride ◽  
High Dose ◽  
Nitride Layers ◽  
Induced Defects ◽  
Kinetics Of

Stoichiometric iron nitride layers have been synthesized by high dose, high energy nitrogen implantation into Fe using a two-step implantation process. First, a nitrogen preimplantation at ~100 °C is used to form nitride precipitates. A low temperature is necessary to restrict the nitrogen mobility. Second, 1 MeV implantation at ~300 °C leads to the formation of a stoichiometric γ′–Fe4N layer at the position of the preimplanted N atoms. Growth of this nitride layer proceeds by diffusion of the implanted N through either the α–Fe matrix (for 200 or 500 keV preimplantations) or the nitride layer itself (for 1 MeV preimplantation). During annealing above 350 °C the γ′ layers dissolve in a planar fashion, characterized by an activation energy of 2.3 eV. Phase formation during preimplantation and phase transformations during subsequent annealing or hot implantation can be understood from the thermodynamics for the Fe–N system, while the kinetics of layer growth is influenced by the beam-induced defects. The experiment and model suggest that γ′ is not a thermodynamically stable phase below 310 ± 10 °C and should decompose into α (ferrite) and ∊ nitride.

Application of a Mathematical Model of Iron-Nitride Layer Growth during Gas Phase Nitriding

1994 ◽  
Vol 163-165 ◽  
pp. 707-712 ◽  
Author(s):  
L. Torchane ◽  
Ph. Bilger ◽  
J. Dulcy ◽  
M. Gantois
Keyword(s):  
Mathematical Model ◽  
Gas Phase ◽  
Nitride Layer ◽  
Layer Growth ◽  
Iron Nitride

Structural Properties of Iron Nitride on Cu(100): an Ab-initio Molecular Dynamics study

2011 ◽  
Vol 1290 ◽  
Author(s):  
Dodi Heryadi ◽  
Udo Schwingenschlögl
Keyword(s):  
Molecular Dynamics ◽  
Ab Initio ◽  
Structural Properties ◽  
Nitride Layer ◽  
Dynamics Simulation ◽  
Ab Initio Molecular Dynamics ◽  
Iron Nitrides ◽  
Iron Nitride ◽  
Magnetic Storage ◽  
Reconstructed Surface

ABSTRACTDue to their potential applications in magnetic storage devices, iron nitrides have been a subject of numerous experimental and theoretical investigations. Thin films of iron nitride have been successfully grown on different substrates. To study the structural properties of a single monolayer film of FeN we have performed an ab-initio molecular dynamics simulation of its formation on a Cu(100) substrate. The iron nitride layer formed in our simulation shows a p4gm(2x2) reconstructed surface, in agreement with experimental results. In addition to its structural properties, we are also able to determine the magnetization of this thin film. Our results show that one monolayer of iron nitride on Cu(100) is ferromagnetic with a magnetic moment of 1.67μB.

scholarly journals Mathematical Modelling of Nitride Layer Growth of Low Temperature Gas and Plasma Nitriding of AISI 316L

2014 ◽  
Vol 13 ◽  
pp. 04022
Author(s):  
A. Triwiyanto ◽  
A. Zainuddin ◽  
K.A.Z Abidin ◽  
M.A Billah ◽  
P. Hussain
Keyword(s):  
Low Temperature ◽  
Mathematical Modelling ◽  
Plasma Nitriding ◽  
Nitride Layer ◽  
Layer Growth ◽  
Aisi 316L

Alumina-Based Functional Materials Hardened with Al or Ti and Al-nitride or Ti-nitride Dispersions

2010 ◽  
Vol 1276 ◽  
Author(s):  
José G. Miranda-Hernández ◽  
Elizabeth Refugio-Garcia ◽  
Elizabeth Garfias-García ◽  
Enrique Rocha-Rangel
Keyword(s):  
Aluminum Nitride ◽  
Titanium Nitride ◽  
Functional Materials ◽  
High Energy ◽  
Nitride Layer ◽  
Layer Growth ◽  
Density Level ◽  
Functional Material ◽  
Energy Ball ◽  
Titanium Powders

AbstractThe synthesis of Al2O3-based functional materials having 10 vol. % of fine aluminum or titanium and aluminum-disperse or titanium-dispersed nitride hardened-particles has been explored. Two experimental steps have been set for the synthesis; specifically, sintering of Al2O3-aluminum or Al2O3-titanium powders which were thoroughly mixed under high energy ball-milling, pressureless-sintered at 1400°C during 1 h in argon atmosphere and then for the second step it was induced formation of aluminum nitride or titanium nitride at 500°C during different times (24, 72 and 120 h) by a nitriding process via immersion in ammoniac salts. SEM analyses of the microstructures obtained in nitride bodies were performed in order to know the effect of the ammoniac salts used as nitrating on the microstructure of aluminum or titanium for each studied functional material. It was observed that an aluminum nitride or titanium nitride layer growth from the surface into the bulk and reaches different depth as the nitriding time of the functional material was increased. The use of aluminum or titanium significantly enhanced density level and hardness of the functional materials.

The Calculation of Kinetic Parameters in Manganese Nitriding

2010 ◽  
Vol 97-101 ◽  
pp. 737-742 ◽  
Author(s):  
Jin Zhu Zhang ◽  
Shui Hui Luo ◽  
Chu Shao Xu
Keyword(s):  
Weight Gain ◽  
Numerical Model ◽  
Kinetic Parameters ◽  
Growth Model ◽  
Metallic Iron ◽  
Nitride Layer ◽  
Layer Growth ◽  
Solid Metal ◽  
Nitriding Temperature ◽  
Set Up

The present work confirmed and achieved the relevant parameters which belong to the manganese nitriding model via experiments. Based on the metallic iron nitriding model and the nitride layer growth model, metal manganese nitrding model was set up. The change laws between the kinetic parameters and temperature of the solid metal manganese nitriding model was studied by using the optimum method. The experimental results showed that the ratio of weight gain for samples relatively increased with the increasing of nitriding temperature, and the results obtained from the numerical model indicated that the kinetic parameters of manganese nitriding model increased with the increasing of nitriding temperature.

EB Surface Alloying and Plasma Nitriding of Different Al Alloys

2011 ◽  
Vol 690 ◽  
pp. 91-94 ◽  
Author(s):  
Anke Dalke ◽  
Anja Buchwalder ◽  
Heinz Joachim Spies ◽  
Horst Biermann ◽  
Rolf Zenker
Keyword(s):  
Plasma Nitriding ◽  
Load Capacity ◽  
Matrix Material ◽  
High Hardness ◽  
Nitride Layer ◽  
Layer Growth ◽  
Research Field ◽  
Al Alloys ◽  
Wear Behaviour ◽  
Surface Alloying

Within the last years, considerable progress was achieved in the research field of plasma nitriding of Al alloys. However, due to large property differences between the very hard AlN layer and the soft Al matrix material the load capacity of the nitride layer is limited. Electron beam (EB) surface alloying modifies the chemical composition of the area near the surface up to a certain depth. This, for instance, results in high hardness levels, and therefore this layer acts as support for the hard and wear-resistant thin AlN layer generated by plasma nitriding. In the present study, surface modifications produced by a combination of EB alloying with Fe based additives and plasma nitriding of wrought, cast and spray-formed Al alloys were investigated. After the EB treatment the layers were examined regarding their influence on the structure, the nitride layer growth mechanism, the effect of the EB layer for the support of the AlN layer and the resulting duplex layer properties, e.g. hardness and wear behaviour.

Hot Tensile Behavior and Fracture Characteristics of a Plasma Nitrided Maraging 300 Steel

2017 ◽  
Vol 899 ◽  
pp. 436-441 ◽  
Author(s):  
Adriano Gonçalves Reis ◽  
Danieli Aparecida Pereira Reis ◽  
Antônio Jorge Abdalla ◽  
Jorge Otubo ◽  
Antônio Augusto Couto ◽  
...  
Keyword(s):  
Cross Section ◽  
Plasma Nitriding ◽  
Nitride Layer ◽  
Tensile Behavior ◽  
Iron Nitride ◽  
Fracture Characteristics ◽  
Area Reduction ◽  
Solution Treated ◽  
Cross Section Area ◽  
Section Area

The influence of plasma nitriding of a maraging 300 steel on mechanical properties at high temperature has been studied. Samples were tensile tested at 600°C in four conditions: solution treated (MAR-S), solution treated and aged (MAR-SA), solution treated and plasma nitrited (MAR-SP) and solution treated, aged and plasma nitrited (MAR-SAP). In the same sequence, the yield strength and ultimate tensile strength increased slightly respectively from 1073 to 1189 MPa and 1174 to 1301 MPa, an increase of about 10% due to plasma nitriding. All the samples presented similar values of elongation, around 18%, but the cross section area reduction decreased significantly by plasma nitriding from ~70% for MAR-S and MAR-SA to ~45% for MAR-SP and MAR-SAP, that is an decrease of 36% in average. This decrease is attributed to brittle fracture nucleated at 50 μm thick iron nitride layer. The inner fracture surface of the tensile tested specimens was predominantly ductile presenting characteristic microcavities.

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