Radiofrequency (RF) Plasma Nitriding

Aghajani, Hossein; Behrangi, Sahand

doi:10.1007/978-3-319-43068-3_5

Cited by 2 publications

(3 citation statements)

References 20 publications

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“…Figure 1 shows a great difference in the roughness values between the nitrided substrates and the heat-treated samples that are not nitrided. During plasma nitriding, the severe sputtering of the surface caused by the nitrogen ions and the applied voltage increases the roughness of the surface, an effect investigated by other authors [41]. After the deposition of the TiAlN and CrAlN monolayers, the roughness of the coatings presents the same tendency as on the substrates before the deposition.…”

Section: Resultsmentioning

confidence: 88%

Tribomechanical Behaviour of TiAlN and CrAlN Coatings Deposited onto AISI H11 with Different Pre-Treatments

et al. 2019

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In the metalworking industry, different processes and applications require the utilisation of custom designed tools. The selection of the appropriated substrate material and its pre-treatment as well as the protective coating are of great importance in the performance and life time of forming tools, dies, punches and coated parts in general. TiAlN and CrAlN coatings have been deposited onto the hot work tool steel AISI H11 by means of Direct Current Magnetron Sputtering. Prior to the deposition, the steel substrate was modified by the implementation of three different pre-treatments: nitriding of the annealed substrate [Nitr.], heat treatment of the steel (quenching and double tempering) [HT] and nitridation subsequent to a heat treatment of the substrate [HT + Nitr.]. The purpose of this research is to obtain valuable information on the microstructural properties and tribomechanical behaviour of two of the most promising ternary transition metal nitride coatings, TiAlN and CrAlN, when deposited on the AISI H11 steel with different initial properties. The different pre-treatments performed to the steel prior to the deposition favour the tailoring during the design and construction of tools for specific applications. The microstructure, the adhesion and the wear resistance of TiAlN coatings were highly influenced by the substrate preparation. Contrarily, CrAlN results were more independent of the substrate preparation and no high influences were found. For instance, the adhesion of the TiAlN coating varied from 17 to 43 N for the coating deposited onto the HT + Nitr. substrate and the HT substrate respectively, while the lowest and highest adhesion of the CrAlN coating varied between 42 and 53 N for the HT and the HT + Nitr. respectively. Likewise, the wear coefficient of the CrAlN were ten times smaller than those found for the TiAlN coatings, presumably due to the presence of hex-AlN phases and the small differences on the Young´s Modulus of the substrate and the CrAlN coatings.

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Section: Resultsmentioning

confidence: 88%

Tribomechanical Behaviour of TiAlN and CrAlN Coatings Deposited onto AISI H11 with Different Pre-Treatments

et al. 2019

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“…The nitriding efficiency can be increased in low-pressure radiofrequency (RF) plasmanitriding treatments, performed at approximately 0.1 Pa, since the higher mean free path reduces the collision probability between particles and allows for the presence of a large number of active species in the plasma atmosphere. Another significant advantage of low-pressure plasma nitriding over conventional plasma nitriding conducted at higher pressures of 100-1000 Pa is that the discharge is inherently stable and reduces its tendency to transform into an arc [28,29]. This process has been successfully used in nitriding AISI 316 stainless steel, since it allows for performing relatively low-temperature treatments at 400 • C, thereby avoiding chromium migration, chromium nitride precipitation, and corrosion resistance loss [30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

“…This process has been successfully used in nitriding AISI 316 stainless steel, since it allows for performing relatively low-temperature treatments at 400 • C, thereby avoiding chromium migration, chromium nitride precipitation, and corrosion resistance loss [30][31][32][33]. RF plasma nitriding brings additional advantages such as minimal distortion of the treated workpiece, shortening the nitriding time, a slower decrease in nitrided layer thickness, better control of the substrate temperature, and a lower feed gas consumption [28,34].…”

Section: Introductionmentioning

confidence: 99%

Scratch Response of Hollow Cathode Radiofrequency Plasma-Nitrided and Sintered 316L Austenitic Stainless Steel

Broch,

Fontoura,

Lima

et al. 2024

Coatings

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Low-temperature plasma nitriding is a thermochemical surface treatment that promotes surface hardening and wear resistance enhancement without compromising the corrosion resistance of sintered austenitic stainless steels. Hollow cathode radiofrequency (RF) plasma nitriding was conducted to evaluate the influence of the working pressure and nitriding time on the microstructure and thickness of the nitrided layers. A group of samples of sintered 316L austenitic stainless steel were plasma-nitrided at 400 °C for 4 h, varying the working pressure from 160 to 25 Pa, and the other group was treated at the same temperature, varying the nitriding time (2 h and 4 h) while keeping the pressure at 25 Pa. A higher pressure resulted in a thinner, non-homogeneous nitrided layer with an edge effect. Regardless of the nitriding duration, the lowest pressure (25 Pa) promoted the formation of a homogenously nitrided layer composed of nitrogen-expanded austenite that was free of iron or chromium nitride and harder and more scratching-wear-resistant than the soft steel substrate.

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Radiofrequency (RF) Plasma Nitriding

Cited by 2 publications

References 20 publications

Tribomechanical Behaviour of TiAlN and CrAlN Coatings Deposited onto AISI H11 with Different Pre-Treatments

Tribomechanical Behaviour of TiAlN and CrAlN Coatings Deposited onto AISI H11 with Different Pre-Treatments

Scratch Response of Hollow Cathode Radiofrequency Plasma-Nitrided and Sintered 316L Austenitic Stainless Steel

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