Effects of ion implantation on nitriding metal by the plasma source nitriding

Nunogaki, Masanobu; Suezawa, H.; Kuratomi, Y.; Miyazaki, Keiko

doi:10.1016/0042-207x(89)90219-4

Cited by 14 publications

(7 citation statements)

References 2 publications

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“…[4][5][6] In the present work, Zr plates (purity: 99.7%; Nilaco Co., Ltd., Tokyo, Japan) with dimensions of 8 mm × 3 mm × 1 mm were used as substrates for the process. The plates were polished with 0.1 µm Al 2 O 3 powder dispersed in water, and annealed for 3 h at 350 • C under vaccum (∼10 −3 Pa).…”

Section: Apparatus and Process Conditionsmentioning

confidence: 99%

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Direct Surface Modification of Zirconium by Reactive Plasma Processing at Elevated Temperatures

Inoue

Yamashita

Suganuma

et al. 2001

Journal of Nuclear Science and Technology

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This paper investigates a surface modification process for Zr to improve its durability, in order to make use of Zr in a blanket module as an effective neutron multiplier with (n, 2n) reaction. Modified ceramic layers were successfully synthesized on Zr substrates by carburizing, nitriding and oxidizing using reactive plasma processes. The microstructural evolution during the plasma process is governed both by the kinetics of the diffusion and by the kinetics of the ordering to form the reaction products. In the case of carburizing, the growth rate of the carbide layer is restrained by the diffusion of C, which was clarified to exhibit high covalency with the neighboring Zr atoms by a first principles molecular orbital simulation, through the layer. By contrast, the diffusion of O which exhibits high ionicity rather than covalency with the Zr lattice is much faster than the rate of ordering to form the monoclinic ZrO 2 phase. A 20 MeV electron beam pre-irradiation process was also conducted at ambient temperatures as a pre-treatment before the plasma process. The electron beam irradiation can influence the reaction behavior during the plasma process, depending on the process conditions.

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Section: Apparatus and Process Conditionsmentioning

confidence: 99%

“…The present authors have experimentally succeeded in the surface modification of metals and intermetallics, such as Zr, Al, Fe, Ti, Ta, and TiAl, with plasmas containing low-Z elements such as C, N and O. [4][5][6][7] In this paper, some preliminary results of surface modification of Zr by reactive plasma process are reported.…”

Section: Introductionmentioning

confidence: 99%

Direct Surface Modification of Zirconium by Reactive Plasma Processing at Elevated Temperatures

Inoue

Yamashita

Suganuma

et al. 2001

Journal of Nuclear Science and Technology

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“…This surface pre-treatment with high energy ion bombardment and sputtering of the target surface during the PIII process may create appropriate conditions for an efficient subsequent nitriding [10,11]. This can be important for some applications, for instance, in the case of Ti6Al4V, which is widely used as biomaterial due to its high strength-to-weight ratio, excellent corrosion resistance, and exceptional biocompatibility.…”

Section: Introductionmentioning

confidence: 99%

“…Substantially thicker modified layer exhibiting more superior wear resistance could be obtained in Ti alloy if much higher temperatures (as high as 800 o C) can be achieved during PIII or by using other auxiliary heating methods. The surface pretreatment with ion implantation is also a different possibility for improved thickness of treated layer [11].…”

Section: Introductionmentioning

confidence: 99%

Results from experiments on hybrid plasma immersion ion implantation/nitriding processing of materials

Ueda¹,

Gomes²,

Kostov³

et al. 2004

Braz. J. Phys.

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To improve the performance of critical part components, new methods for surface strengthening are being developed with success, like plasma immersion ion implantation (PIII) and hybrid surface treatments mixing PIII and ion nitriding processes. A combination of high pressure (4 × 10 1 P a), moderate temperature (up to 450 o C) glow discharge nitriding with low pressure (8 × 10 −2 P a) and low DC bias voltage ion nitriding (or DC PIII) was implemented. Depending on the particular conditions of the treatment and the depth probed, mixed phases of γN and ε were measured in the treated SS304 steel sample. This near surface modification resulted in an improved hardness (up to a factor of 2.7 ×) of the sample which could also enhance its wear properties. Surface modification of Ti6Al4V alloy and SS304 steel by a combination of PIII and subsequent ion nitriding was investigated as well. Nitrogen ions were implanted into the specimens at 15 keV and then ion nitrided at low pressure (7 × 10 −2 P a) with a bias of -800 V. Compared to the untreated samples, the hardness of Ti6Al4V alloy and the steels could be improved significantly. AES results indicated high retained doses in both samples, confirming the high efficiency of this hybrid process.

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“…Ion implantation with one of such light or heavy ions as; Ar, N, Ni, Mo and W into pure aluminum was carried out as the pretreatment at energy of 25 keV, and afterwards, nitridation was performed as the main process. The result was that the effects of ion implantation on nitriding pure aluminum depended sensitively on the ion species and the fluence [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

A New Metal-Ion Source with An Electron-Beam Evaporator for Surface Modification

Nunogaki

Emura

Shigemoto

et al. 2010

e-J. Surf. Sci. Nanotechnol.

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A metal-ion source equipped with an EB (Electron Beam) gun for the evaporation of solid materials was designed, and its prototype source was constructed. The prototype produced the source plasma successfully by PIG discharge with the metal vapors of titanium, zinc, and manganese without feeding any ignition gas. As a preliminary results, the extracted total currents composed of Ti + , Zn + and Mn + ions were measured as unsaturated currents of about 50 , 115 and 155 µA·dc, respectively, at an extraction voltage of 6 kV.

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Effects of ion implantation on nitriding metal by the plasma source nitriding

Cited by 14 publications

References 2 publications

Direct Surface Modification of Zirconium by Reactive Plasma Processing at Elevated Temperatures

Direct Surface Modification of Zirconium by Reactive Plasma Processing at Elevated Temperatures

Results from experiments on hybrid plasma immersion ion implantation/nitriding processing of materials

A New Metal-Ion Source with An Electron-Beam Evaporator for Surface Modification

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