Properties of NiCrBSi coating, as sprayed and remelted by different technologies

Houdková, Šárka; Smazalová, Eva; Vostřák, Marek; Schubert, Jan

doi:10.1016/j.surfcoat.2014.05.009

Cited by 132 publications

(62 citation statements)

References 21 publications

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“…In addition, the N4 coating had the largest coefficient of friction, and the volatility was very large: the N3 coating is second only to the N4 coating in that regard because the coating speed was too fast, the coating absorbed too little energy, and the nodules and tear-like aggregates on the coated surface increased the frictional resistance as shown by the macroscopic appearance of the remelted coatings in Figure 2. Since the laser scanning speed of the N1 coating and the N2 coating was low, sufficient energy was absorbed, recrystallisation occurred in the plasma spray coating, and a large amount of hard ceramic phase was precipitated, so the coefficient of friction was low [31]. The hardness curve is divided into three distinct steps corresponding to the coating of the cladding area, the heat-affected zone, and the substrate.…”

Section: Microhardness Of the Coatingsmentioning

confidence: 99%

Effect of Laser Scanning Speed on the Wear Behavior of Nano-SiC-Modified Fe/WC Composite Coatings by Laser Remelting

Zhao

2018

Coatings

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A supersonic plasma sprayed nano-SiC-modified WC/Fe metal-cermet composite coating was remelted with a fibre-pulsed laser at four different laser scanning speeds (100, 150, 200 and 250 mm·min −1 ) while the other parameters were kept constant. The microstructures, microhardness, and tribological properties of the coatings were analysed by means of SEM (scanning electron microscopy), XRD (X-ray diffractometer), and a friction tester, respectively. The results show that, when the laser scanning speed is 100 mm·min −1 , the remelted coating is most dense with regard to the coverage of the substrate. The coating with nano-particles became more smooth, and elements Si and C in the nano-particles reacted with Fe, Ni, or Cr and formed a hard mesophase that enhanced the strength and hardness of the coating. With the increase of laser scanning speed, the hardness of the four coatings increased first and then decreased, and the nano-SiC-modified remelted coating showed a maximum microhardness of about HV 0.5 1350, and the nano-particles made the coating's micro-structure finer, at a laser scanning speed of 150 mm·min −1 . The friction coefficient and wear rate of the four coatings were 0.58 and 12.01 × 10 −5 mm 3 /(N·m), 0.21 and 8.50 × 10 −5 mm 3 /(N·m), 0.62 and 20.04 × 10 −5 mm 3 /(N·m), and 1.23 and 25.13 × 10 −5 mm 3 /(N·m). The remelted coating at a laser scanning speed of 150 mm·min −1 exhibits the best wear resistance and its wear mechanism is governed by slight adhesion wear and plastic deformation.

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Section: Microhardness Of the Coatingsmentioning

confidence: 99%

Effect of Laser Scanning Speed on the Wear Behavior of Nano-SiC-Modified Fe/WC Composite Coatings by Laser Remelting

Zhao

2018

Coatings

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“…Moreover, the carbides are firmly attached and there are no signs of them pulling out of the Ni matrix. It is well known that abrasive wear resistance is strongly influenced by material hardness and microstructural features [26,27]. In contrast to the steel substrate, the composite coatings contain numerous fine in-situ synthesized TiC particles and chromium carbides particles.…”

Section: Wear Resistancementioning

confidence: 99%

Microstructures and properties of in-situ TiC particles reinforced Ni-based composite coatings prepared by plasma spray welding

Huang

Sun

Wang

et al. 2015

Ceramics International

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“…However, in the most demanding operating conditions, residual porosities of a few percent units can still present a significant limitation, and the coatings applied for corrosion protection need to be made impervious by means of appropriate surface sealing treatments [24,25].…”

Section: Introductionmentioning

confidence: 99%

Hot Corrosion Resistance of Laser-Sealed Thermal-Sprayed Cermet Coatings

et al. 2019

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Hot corrosion affects the components of diesel engines and gas turbines working at high temperatures, in the presence of low-melting salts and oxides, such as sodium sulfate and vanadium oxide. Thermal-sprayed coatings of nickel-chromium-based alloys reinforced with ceramic phases, can improve the hot corrosion and erosion resistance of exposed metals, and a sealing thermal, post-treatment can prove effective in reducing the permeability of aggressive species. In this study, the effect of purposely-optimized high-power diode laser reprocessing on the microstructure and type II hot corrosion resistance of cermet coatings of various compositions was investigated. Three different coatings were produced by high velocity oxy-fuel and was tested in the presence of a mixture of Na 2 SO 4 and V 2 O 5 at 700 • C, for up to 200 h: (i) Cr 3 C 2 -25% NiCr, (ii) Cr 3 C 2 -25% CoNiCrAlY, and (iii) mullite nano-silica-60% NiCr. Results evidenced that laser sealing was not effective in modifying the mechanism, on the basis of the hot corrosion degradation but could provide a substantial increase of the surface hardness and a significant decrease of the overall coating material consumption rate (coating recession), induced by the high temperature corrosive attack.

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Properties of NiCrBSi coating, as sprayed and remelted by different technologies

Cited by 132 publications

References 21 publications

Effect of Laser Scanning Speed on the Wear Behavior of Nano-SiC-Modified Fe/WC Composite Coatings by Laser Remelting

Effect of Laser Scanning Speed on the Wear Behavior of Nano-SiC-Modified Fe/WC Composite Coatings by Laser Remelting

Microstructures and properties of in-situ TiC particles reinforced Ni-based composite coatings prepared by plasma spray welding

Hot Corrosion Resistance of Laser-Sealed Thermal-Sprayed Cermet Coatings

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