Ion nitriding of pure iron using high-density plasma beam generated by a tubular plasma source

Li, S.L.; Ma, Chunyu; Zhang, Q.Y.; Ren, Chunsheng; Lü, Wenqi

doi:10.1016/j.surfcoat.2016.11.040

Cited by 16 publications

(3 citation statements)

References 29 publications

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“…The analysis of measured spectra focused on the second positive system of N 2 , and specifically the band of emission lines from 300 to 385 nm [19][20][21]. This electronic transition is between the third and the second excited triplet states of nitrogen molecules [22].…”

Section: Plasma Characterizationmentioning

confidence: 99%

The impact of transition metal catalysts on macroscopic dielectric barrier discharge (DBD) characteristics in an ammonia synthesis plasma catalysis reactor

Herrera

Brown

Barboun

et al. 2019

J. Phys. D: Appl. Phys.

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When non-equilibrium, low-temperature plasmas and catalysts interact, they can exhibit synergistic behavior that enhances the chemical activity above what is possible with either process alone. Unlike thermal catalysis, in plasma-assisted catalysis the non-equilibrium state of the plasma produces reactive intermediates, such as excited species, that may play an important role in the catalytic process. There are two primary plasma-surface mechanisms that could produce this synergy: the effect of the plasma on the catalyst (e.g. enhanced adsorption/reaction of plasma-activated species, change of surface structure/ morphology, hot spots, etc) and the effect of the catalyst on the plasma state. This work focuses on the latter. We use a laboratory-scale, packed bed, dielectric barrier discharge (DBD) reactor to observe the influence of multiple alumina (Al 2 O 3 ) supported, transition metal ammonia (NH 3 ) synthesis catalysts on the plasma electrical and optical properties. We find that while the rates of ammonia synthesis over the materials considered, including

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Section: Plasma Characterizationmentioning

confidence: 99%

The impact of transition metal catalysts on macroscopic dielectric barrier discharge (DBD) characteristics in an ammonia synthesis plasma catalysis reactor

Herrera

Brown

Barboun

et al. 2019

J. Phys. D: Appl. Phys.

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“…When compared to conventional gas and liquid nitriding, plasma nitriding represents a more versatile and cost-effective technique due to the optimised metallurgical control of the structure and crystalline phases which constitute the nitride layer [15][16][17][18]. Generally, these treatments improve the surface mechanical properties of the material such as hardness, wear resistance, fatigue, and friction [19][20][21][22][23]. Literature studies revealed that the plasma nitriding of stainless steels and hot/cold working tool steels results in much improved wear resistance [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

High-temperature tribological studies of plasma-nitrided tool steels

Kumar

Kaur

Singh

et al. 2018

Surface Engineering

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During hot forging/forming operations, the die surface and near surface region is subjected to severe wear. The failure of dies originates from the surface region. In this research work, plasma nitriding was done on two hot forming tool steels namely AISI H11 and AISI H13. The aim is to develop a hard and wear resistance surface required for hot forming operations. The mechanical and microstructural properties of the developed nitrided layer were critically examined. Thereafter the tribological characteristics of the untreated and plasma-nitrided specimens were studied on high-temperature pin-on-disc tribometer under the constant load of 25 N, sliding speed 0.5 m s −1 , sliding distance of 1500 m at different temperatures ranging from room temperature to 600°C. The results showed that the main wear mechanisms is predominantly adhesive at room temperatures and 200°C and a combination of adhesive and abrasive at elevated temperatures (400°C and 600°C).

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“…Surface modification processes influence microstructure and properties of steels [25][26][27][28][29] even at a low-temperature nitriding process [30]. Hydrogen-free ion nitriding improves the mechanical characteristics and performance of hard alloys T5K10 and T15K6 [31].…”

Section: Figurementioning

confidence: 99%

Surface Hardening of Massive Steel Products in the Low-pressure Glow Discharge Plasma

et al. 2019

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A process vacuum chamber is filled with a homogeneous plasma of glow discharge with electrostatic electron confinement, which is used for surface hardening of massive products. At the current of 2–20 A and the gas pressure ranging from 0.1 to 1 Pa the discharge voltage amounts to 350–500 V. When a bias voltage of 2 kV is applied to an immersed in the plasma hollow cylinder with a mass of 15 kg, electrical power spent on heating it by accelerated ions exceeds by an order of magnitude the power spent on the discharge maintenance. The massive cylinder is heated up to 700 °C for 15 min. When argon mixture with nitrogen (30%) is used, the nitriding for 3h results in an increase in the surface hardness from 400 up to 1000 HV50 and the nitrided layer thickness grows to ~100 μm. The nitriding rate is enhanced by a high degree of nitrogen dissociation due to decomposition by fast electrons and surface structural defects due to bombardment by high-energy ions.

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Ion nitriding of pure iron using high-density plasma beam generated by a tubular plasma source

Cited by 16 publications

References 29 publications

The impact of transition metal catalysts on macroscopic dielectric barrier discharge (DBD) characteristics in an ammonia synthesis plasma catalysis reactor

The impact of transition metal catalysts on macroscopic dielectric barrier discharge (DBD) characteristics in an ammonia synthesis plasma catalysis reactor

High-temperature tribological studies of plasma-nitrided tool steels

Surface Hardening of Massive Steel Products in the Low-pressure Glow Discharge Plasma

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