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- 저자 : Fengjiu Sun (검색결과 6 건)
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Junyou Liu,Fengjiu Sun,Hanjiang Yu 한국물리학회 2005 Current Applied Physics Vol.5 No.6
In this work, the nitrogen molecular dissociation and ionization levels in Ar/N2 ue plasma are evaluated as functions of plasmaparameters such as Ar mixture quantity and N2 ux in order to obtain the best condition for various applications such as thin lmdeposition and material surface modication. This plasma is operated at 10kV and the nitrogen dissociation rate is determined byanalyzing the optical emission of the nitrogen band. For dierent operating conditions, the dissociation rate [N] of N2 molecules wasenhanced, as the mixture quantity of Ar increased from 0.06m3/h to 0.9m3/h and the max of enhancement factor is 4.3. This factorbecomes bigger when the N2 ux becomes bigger. Moreover, the molecular nitrogen ionization density is calculated from the currentintensity of the plasma. The ionization density was also enhanced, as the mixture quantity of Ar increased from 0.1m3/h to 1.5m3/h,under three dierent voltages. The max of enhancement factor of 1.96 is much smaller than the factor of the dissociation rate. Theseresults are discussed in terms of the kinetics of the electrons, nitrogen ions, atoms and molecules..
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Laser and plasma nitriding of titanium using CW-CO2 laser in the atmosphere
Hanjiang Yu,Fengjiu Sun,Jun Zhang 한국물리학회 2009 Current Applied Physics Vol.9 No.1
Surface nitriding of the titanium by the mixing technology with laser and plasma (LPN) in atmosphere has been investigated. Comparing with the technique of laser nitriding, we could obtain the titanium nitride at relatively low laser power density and the oxidation was prevented without the chamber. The synthesized layers comprised of titanium nitrides were about 178 ㎛ depth. The effect of the laser power density, scanning velocity, and plasma flow rate on the components consisting of the material of the nitrided layer was studied. X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) were used to reveal the components consisting of the material of the nitrided layer. Surface nitriding of the titanium by the mixing technology with laser and plasma (LPN) in atmosphere has been investigated. Comparing with the technique of laser nitriding, we could obtain the titanium nitride at relatively low laser power density and the oxidation was prevented without the chamber. The synthesized layers comprised of titanium nitrides were about 178 ㎛ depth. The effect of the laser power density, scanning velocity, and plasma flow rate on the components consisting of the material of the nitrided layer was studied. X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) were used to reveal the components consisting of the material of the nitrided layer.
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Thermal stability of iron nitrides prepared by mixing laser and plasma beam nitriding technology
Junyou Liu,Fengjiu Sun,Hanjiang Yu,Aidang Shan 한국물리학회 2008 Current Applied Physics Vol.8 No.2
Thermal stability of iron nitrides prepared by mixing laser and plasma beam nitriding (LPN) technology was studied. The treated(XRD), the nitride’s contents were calculated from the patterns of XRD, and the microstructures were analyzed by scanning electronmicroscope (SEM). Three critical temperatures (473 K, 673 K, and 1273 K) are found. Due to deeper nitriding layer in the LPN sample,the nitrides is more stable than that in laser-produced sample at the annealing temperature higher than 973 K. It is important and centralfor some potential industrial productions and applications.
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Monte Carlo simulation of nitriding in iron by a mixing technology with laser and plasma beams
Junyou Liu,Fengjiu Sun,Hanjiang Yu,Aidang Shan 한국물리학회 2007 Current Applied Physics Vol.7 No.6
A program is modeled to describe nitriding depth by a new mixing laser and plasma beams nitriding (LPN) technique. The modelextends the transport of ions in matter (TRIM) program by adding temperature and energy factors into the energy function. The nitrid-lation and experiment results at dierent laser energy intensities, scanning velocities and nitrogen ion energies respectively. Moreover, thenitriding process diagrams by LPN technique are shown from calculation results.
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Hanjiang Yu,Tianya Tan,Wei Wu,Chao Tian,Ying An,Fengjiu Sun 한국물리학회 2012 Current Applied Physics Vol.12 No.1
Titanium samples were treated by the mixing technology with laser and plasma (LPN) using different laser power densities. These nitrided samples were then annealed at 473 K, 673 K, 873 K, and 1073 K for 2 h in vacuum, respectively. The samples before and after annealing were characterized at room temperature and compared in terms of microstructure. X-ray diffraction and cross-sectional optical microscopy studies showed that the layer structure of the titanium nitride coating is preserved after annealing at 1073 K when the coating is formed using a laser power density of 8.0 105 W/cm2. Therefore, titanium nitride coatings produced by LPN demonstrate excellent thermal stability and are potential candidates for high temperature tribological applications. Titanium samples were treated by the mixing technology with laser and plasma (LPN) using different laser power densities. These nitrided samples were then annealed at 473 K, 673 K, 873 K, and 1073 K for 2 h in vacuum, respectively. The samples before and after annealing were characterized at room temperature and compared in terms of microstructure. X-ray diffraction and cross-sectional optical microscopy studies showed that the layer structure of the titanium nitride coating is preserved after annealing at 1073 K when the coating is formed using a laser power density of 8.0 105 W/cm2. Therefore, titanium nitride coatings produced by LPN demonstrate excellent thermal stability and are potential candidates for high temperature tribological applications.
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