Microabrasion-corrosion resistance of Ni–Cr superalloys deposited by plasma transferred arc (PTA) welding

Garcia, Regina Paula; Canobre, Sheila Cristina; Costa, H.L.

doi:10.1016/j.triboint.2019.106080

Cited by 20 publications

(18 citation statements)

References 42 publications

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“…This is to be expected. The change in wear resistance and friction coefficient is usually associated with a change in hardness [28]. In their turn, all of the above strength characteristics of the material are due to the state of its structure and elemental composition.…”

Section: Research Results and Discussionmentioning

confidence: 99%

Improving die tooling properties by spraying TiC-Ti-Al and TiB₂-Ti-Al electro-explosive coatings

Романов

2020

Mater. Res. Express

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This article describes increasing wear resistance of 5CrNiMo die steel by more than 5 times. This effect is achieved by creating TiC-Ti-Al and TiB 2 -Ti-Al coatings on the surface of 5CrNiMo die steel. The microhardness of the formed coatings depends on which part of the structure is measured. The microhardness differs by more than 12 times in the matrix material and in the inclusions of titanium carbides and borides. However, the combination of metal matrix composites and the reinforcing inclusions suggests a high complex of properties of the formed coatings. The formation of wearresistant coatings of these systems is carried out by two-stage treatment. At the first stage, electroexplosive spraying of TiC-Ti-Al or TiB 2 -Ti-Al coatings is performed. At the second stage, electronbeam treatment of these coatings is carried out. The structure uniformity during electro-explosive spraying is enforced by specially designed composite conductors, which are electrically exploded. The reason for wear resistance increase is the formation of a multiphase finely dispersed structure in coatings based on TiC, Al 3 Ti, Ti and Ti 3 Al phases for TiC-Ti-Al system and TiB 2 , TiB and AlTi 3 phases for TiB 2 -Ti-Al system. The structure was also studied in detail at the interface between the coatings and the substrate using transmission electron microscopy. The studies of the structure of electroexplosive coatings were compared with the structural features of TiC-Ti-Al composite coatings obtained by the laser cladding technique on the surface of TiAl alloy. Comparison of the findings of the structure obtained by these two different spraying methods revealed both general patterns and characteristic features for each of the coating methods. They relate to features at the interface between the coatings and the substrate, as well as characteristic unitary coating layers.

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Section: Research Results and Discussionmentioning

confidence: 99%

Improving die tooling properties by spraying TiC-Ti-Al and TiB₂-Ti-Al electro-explosive coatings

Романов

2020

Mater. Res. Express

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“…However, most of these methods have a significant drawback as the process temperature reaches only 1500 • C, whereas, for hazardous wastes such as furans, chlorine or sulfur compounds and various carbon derivatives, these temperatures are not sufficient for neutralization or recycling processes. In order to neutralize or recycle particularly hazardous and hardly breaking waste, the process temperature must reach at least 1800 • C and above [8][9][10][11][12]. It is not possible to achieve such ambient temperatures using the traditional methods mentioned above.…”

Section: Introductionmentioning

confidence: 99%

Investigations of Working Characteristics of Transferred Arc Plasma Torch Volume Reactor

Kavaliauskas¹,

Uscila²,

Kėželis³

et al. 2022

Applied Sciences

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A transferred arc plasma torch chemical rector was used to process waste formed from mixtures of dry clay powder and hydroquinone. Such reactors are best suited for the treatment of electrically conductive waste. In these types of reactors, the electric arc moves chaotically throughout the entire reactor volume, making it possible to ensure an even temperature distribution in the reaction zones. An analysis of the literature has shown that there are not many study results related to this type of reactor. The novelty of the work is that the behavior of the operating electric arc inside the reactor was recorded by using a high-speed camera. The distribution of the temperature profile at the cooled reactor wall was investigated. The electrical potential difference inside the reactor was also investigated. To better understand the behavioral properties of the electric arc when the reactor is filled with treated material, hydroquinone-contaminated clay was used. In this case, the movement of the electric arc, as well as the probability of its formation, is the greatest at the location where the thinnest layer of the material to be processed is located. In addition, it has been observed that the use of a graphite anode poses problems because, over time, the anode of such a design deforms due to interactions with the electric arc. While analyzing research results, it can be observed that these types of reactors are very suitable for the treatment of electrically conductive materials and for the treatment of small amounts of nonconductive materials when the material occupies a relatively small part of the reactor. A further development of these studies in the future is planned in order to make the reactors as versatile as possible and as suitable as possible for handling the widest range of materials possible.

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“…Amongst the most current reports found in the literature, the creation of protective barriers using plasma technologies stands out, be it the so-called hot plasma, or the one characterized as cold plasma, in which the substrates temperature remains close to the environmental 13 . In this context, some works use plasma electrolytic oxidation (PEO) techniques 1,2,14,15 and their variants 16,17 ; plasma transferred arc (PTA) 18 and thermal spray [19][20][21] , techniques in which the substrate usually reaches high temperatures. Other report deposition processes in low-pressure plasma 5,13,22 and in atmospheric-pressure plasma 22 .…”

Section: Introductionmentioning

confidence: 99%

Effect of Plasma Oxidation Treatment on Production of a SiOx/SiOxCyHz Bilayer to Protect Carbon Steel Against Corrosion

et al. 2021

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Because of its excellent properties, carbon steel is a material widely used in several sectors. However, it is easily corroded when exposed to the environment. Seeking to remedy this problem, the possibility of coating carbon steel with SiO x /SiO x C y H z films generated by deposition and oxidation in low-pressure plasmas was investigated. Specifically, the effects of excitation power of the oxidation plasma on layer thickness, chemical structure, elemental composition, and barrier properties of the obtained coatings were investigated. The coating of the steel with the SiO x C y H z film, generated by plasma in an atmosphere of hexamethyldisiloxane (HMDSO), increased the total resistance to the passage of electric current, measured by electrochemical impedance spectroscopy. However, under the condition of moderate power oxidation (50 W), the results point to the creation of a bilayer system with high resistance to electrochemical attack compared to the SiO x C y H z film, even though its thickness is less than this.

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Microabrasion-corrosion resistance of Ni–Cr superalloys deposited by plasma transferred arc (PTA) welding

Cited by 20 publications

References 42 publications

Improving die tooling properties by spraying TiC-Ti-Al and TiB₂-Ti-Al electro-explosive coatings

Improving die tooling properties by spraying TiC-Ti-Al and TiB₂-Ti-Al electro-explosive coatings

Investigations of Working Characteristics of Transferred Arc Plasma Torch Volume Reactor

Effect of Plasma Oxidation Treatment on Production of a SiOx/SiOxCyHz Bilayer to Protect Carbon Steel Against Corrosion

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Microabrasion-corrosion resistance of Ni–Cr superalloys deposited by plasma transferred arc (PTA) welding

Cited by 20 publications

References 42 publications

Improving die tooling properties by spraying TiC-Ti-Al and TiB2-Ti-Al electro-explosive coatings

Improving die tooling properties by spraying TiC-Ti-Al and TiB2-Ti-Al electro-explosive coatings

Investigations of Working Characteristics of Transferred Arc Plasma Torch Volume Reactor

Effect of Plasma Oxidation Treatment on Production of a SiOx/SiOxCyHz Bilayer to Protect Carbon Steel Against Corrosion

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Improving die tooling properties by spraying TiC-Ti-Al and TiB₂-Ti-Al electro-explosive coatings

Improving die tooling properties by spraying TiC-Ti-Al and TiB₂-Ti-Al electro-explosive coatings