Mechanical and tribological properties of high velocity oxy-fuel thermal sprayed nanocrystalline CrCNiCr coatings

Picas, Josep A.; Forn, Antonio; Igartua, A.; Mendoza, Gemma

doi:10.1016/s0257-8972(03)00393-1

Cited by 51 publications

(26 citation statements)

References 5 publications

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“…In addition, Picas et al reported that the specific wear rate of thermal sprayed nanocrystalline CrC-NiCr coatings was decreased by the decrease of the spray powder size by using a pin-on-disk wear tester. 21) Since the original particle size of our WC cermet powder feedstock is very small (about 1-2 mm) and these small particles are partially oxidized from surface by the spray flame, it is expected that fine oxide particles were dispersed in the coatings by thermal spray technique. The thermal spray coatings might easily generate the small oxide wear debris by wear than coatings made by other processes.…”

Section: Resultsmentioning

confidence: 99%

Effect of Spray Condition and Heat Treatment on the Structure and Adhesive Wear Properties of WC Cermet Coatings

2005

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An improved HVOF spray process called ''Gas-shrouded HVOF'' (GS-HVOF) has been developed over the past several years. By using an extension nozzle at the exit of a commercial HVOF spray gun, GS-HVOF is capable of controlling the oxidation of sprayed materials during flight as well as achieving higher velocity of sprayed particles. These features result in extremely dense and clean microstructure of the sprayed coatings. The process has been successfully applied to corrosion resistant alloys such as SUS316L, HastelloyC, and alloy 625 as well as cermets such as WC-Cr 3 C 2 -Ni. Wear properties of WC cermet coatings were measured by using a pin-on-disk wear tester. The specific wear rates of the coatings prepared by the GS-HVOF with a reducing (fuel rich) flame were close to that of chrome plating. The wear amount of the heat-treated GS-HVOF coatings could not be detected after testing. It is believed that transition to mild wear appeared early because of the increased surface oxidation due to the heat treatment.

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Section: Resultsmentioning

confidence: 99%

Effect of Spray Condition and Heat Treatment on the Structure and Adhesive Wear Properties of WC Cermet Coatings

2005

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“…In the 75Cr 3 C 2 -25Ni(Cr) coatings, deposited by plasma spraying, there are present the particles of carbide types Cr 3 C 2 , Cr 7 C 3 and Cr 23 C 6 . The phenomenon of a significant degradation of Cr 3 C 2 carbide particles has been published in the literature (Ji, et al, 2006, p.6749) (Picas, et al, 2003(Picas, et al, , pp.1095 (Verdon et al, 1998, pp.11-14). Non uniform values of hardness along coatings have been reported by many authors.…”

Section: Which Is An Inert Gas and Does Not React With The Powder; Itmentioning

confidence: 95%

“…Delovi na kojima se primenjuje ova prevlaka su : hidraulički cilindri i klipnjače, pločice ventila, turbinske komponente, sita i čunjevi, vretena i ventili brodskih motora, kućišta pumpi i dr. (Material Product Data Sheet, 2012, Woka 7203 Chromium Carbide -25% Nickel Chromium Powders, DSMTS-0031.1, Sulzer Metco). U kermet prevlakama sa različitim termo-sprej procesima uočene su značajne varijacije u sastavu i mikrostrukturi usled izlaganja praha visokim temperaturama i različitim brzinama gasa u procesu (Matthews, et al, 2007, pp.59-64 (Ji, et al, 2006, p.6749), (Picas, et al, 2003(Picas, et al, , pp.1095 (Brossard, et al, 2010(Brossard, et al, , pp.1608(Brossard, et al, -1615, (Matthews, et al, 2007, pp. 59-64), (Mrdak, 2011, pp.…”

Section: Literatureunclassified

Influence of a powder feed rate on the properties of the plasma sprayed chromium carbide-25% nickel chromium coating

Mrdak¹

2014

Vojnotehnički glasnik

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“…However, most of the applications in which the hard Cr 3 C 2 -NiCr coatings are employed generally comprise environments that are intrinsically corrosive [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Behavior of Bilayer Thermal-Spray Coatings in Low-Temperature Corrosion Protection

Sadeghimeresht

Markocsan

2017

Coatings

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Cr 3 C 2 -NiCr coatings are greatly used to protect critical components in corrosive environments and to extend their lifetime and/or improve functional performance. However, the pores formed during spraying restrict the coating's applicability area for many corrosion protection applications. To overcome this technical challenge, bilayer coatings have been developed, in which an additional layer (the so-called "intermediate layer") is deposited on the substrate before spraying the Cr 3 C 2 -NiCr coating (the so-called "top layer"). The corrosion behavior of the bilayer coating depends on the composition and microstructure of each layer. In the present work, different single-layer coatings (i.e., Cr 3 C 2 -NiCr, Fe-and Ni-based coatings) were initially sprayed by a high-velocity air fuel (HVAF) process. Microstructure analysis, as well as electrochemical tests, for example, open-circuit potential (OCP) and polarization tests, were performed. The potential difference (∆E) had a great influence on galvanic corrosion between the top and intermediate layers, and thus, the coatings were ranked based on the OCP values (from high to low) as follows: NiCoCrAlY > NiCr > Cr 3 C 2 -NiCr > NiAl > Fe-based coatings (alloyed with Cr) > pure Ni. The Ni-based coatings were chosen to be further used as intermediate layers with the Cr 3 C 2 -NiCr top layer due to their capabilities to show high OCP. The corrosion resistance (R p ) of the bilayer coatings was ranked (from high to low) as follows: NiCoCrAlY/Cr 3 C 2 -NiCr > NiCr/Cr 3 C 2 -NiCr > NiAl/Cr 3 C 2 -NiCr > Ni/Cr 3 C 2 -NiCr. It was shown that splat boundaries and interconnected pores are detrimental for corrosion resistance, however, a sufficient reservoir of protective scale-forming elements (such as Cr or/and Al) in the intermediate layer can significantly improve the corrosion resistance.

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Mechanical and tribological properties of high velocity oxy-fuel thermal sprayed nanocrystalline CrCNiCr coatings

Cited by 51 publications

References 5 publications

Effect of Spray Condition and Heat Treatment on the Structure and Adhesive Wear Properties of WC Cermet Coatings

Effect of Spray Condition and Heat Treatment on the Structure and Adhesive Wear Properties of WC Cermet Coatings

Influence of a powder feed rate on the properties of the plasma sprayed chromium carbide-25% nickel chromium coating

Electrochemical Behavior of Bilayer Thermal-Spray Coatings in Low-Temperature Corrosion Protection

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