Properties of Flame Spraying Coatings Reinforced with Particles of Carbon Nanotubes

Czupryński, Artur; Mele, Claudio

doi:10.2478/adms-2021-0005

Cited by 7 publications

(4 citation statements)

References 47 publications

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“…These types of tubular walls are used for the production of heat exchangers in waste incineration boilers. Thermally sprayed coatings with nickel-based alloys significantly increase the resistance of pipes to corrosion and erosion [ 33 , 34 , 35 ]. They can be manufactured on new tubular structures or in the event of the need to repair elements of a panel damaged during operation.…”

Section: Resultsmentioning

confidence: 99%

High-Temperature Corrosion of Flame-Sprayed Power Boiler Components with Nickel Alloy Powders

et al. 2023

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The development trends in the energy sector clearly indicate an increase in the share of biomass and alternative fuels fed for combustion in power boilers, which results in the imposition of many unfavourable factors and a demanding working environment. During the operation of the energy system, this means a sharp increase in corrosion of the gas-tight pipe walls and coils by the destructive action of chlorine and sulphur. Implementing advanced surface protection in addition to the selection of materials of better quality and resistance to difficult working conditions would significantly reduce their wear by high temperature corrosion. Thermally sprayed coatings offer a great opportunity to protect machine components and energy systems against corrosion, erosion, impact load and abrasive wear. This article presents the test results of high-temperature corrosion resistance of coatings made with Ni-Cr-B-Si and Ni-B-Si alloy powders on a boiler steel substrate. Samples with sprayed coatings were exposed to an atmosphere with a composition of N2 + 9% O2 + 0.08% SO2 + 0.15% HCl at 800 °C for 250, 500, 750 and 1000 h. Tests results of coatings made of Ni-Cr-B-Si alloys subjected to the influence of a corrosive environment showed the formation of a layer of scale on the surface, composed mainly of Cr2O3 oxide, which was a passive layer, reducing the rate of corrosion. Coatings sprayed with Ni-B-Si alloys showed significantly lower corrosion resistance. It was found that the developed technology of subsonic flame spraying with powders of the Ni-Cr-B-Si type allows the production of coatings compliant with the requirements of the energy industry, which allows their use as anti-corrosion protection on boiler elements intended for waste disposal and biomass combustion.

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Section: Resultsmentioning

confidence: 99%

High-Temperature Corrosion of Flame-Sprayed Power Boiler Components with Nickel Alloy Powders

et al. 2023

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“…The abrasive wear tests were performed according to ASTM G65 standard [13]. A 5kg load was used to push the sample against the rotating rubber lined wheel rotating at 200rpm, the sand was fed between the sample and the rotating wheel as shown in Figure 3.…”

Section: Mechanical Testingmentioning

confidence: 99%

In-situ production of WC-Ni using a laser cladding technique

et al. 2022

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Metal Matrix Composite (MMC) coatings of Tungsten Carbide (WC) and Nickel (Ni) powder were produced using laser cladding process. A crack free and good metallurgically bonded WC-Ni coating of about 5mm thick produced from varying both laser energy density and percent mixture of Ni and WC. In this study, the microstructure of WC-Ni coatings were characterised using optical microscope (OM), scanning electron microscope (SEM) with EDS, while mechanical properties of the coating were studied using Vickers hardness tester and abrasion wear resistance tester. It was found that the hardness and wear resistance increase as the percentage of WC increases.

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“…The laser surface alloying process in comparison to laser melting allows for a wider influence on the structure and properties of surface layers by adjusting the chemical composition of a liquid metal pool by the addition of the alloying elements. Previous studies in this field have shown that the addition of elements with high affinity to carbon in the laser alloying process may result in the formation of an in situ composite structure in the surface layer area [16][17][18][19]. An example of such an element is titanium, which when added in the laser alloying of a ductile cast iron surface causes the formation of high-hardness titanium carbides in the structure of the surface layer, which has a beneficial effect on the wear resistance of the surface.…”

Section: Introductionmentioning

confidence: 99%

The Laser Alloying Process of Ductile Cast Iron Surface with Titanium Powder in Nitrogen Atmosphere

et al. 2022

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The article presents the results of the laser alloying process of a ductile cast iron EN-GJS 350-22 surface with titanium powder in nitrogen atmosphere. The aim of this research was to test the influence of nitrogen atmosphere on the structure and properties of the ductile cast iron surface layer produced by a laser alloying process with titanium. The laser alloying process was conducted using a Rofin Sinar DL020 2 kW high-power diode laser (HPDDL) with rectangular focus and uniform power density distribution in the focus axis. The tests of the produced surface layers included macrostructure and microstructure observations, X-ray diffraction (XRD) analysis, energy-dispersive spectroscopy (EDS) on scanning electron microscope (SEM) and transmission electron microscope (TEM), Vickers hardness and solid particle erosion according to ASTM G76-04 standard. As a result of the laser alloying process in nitrogen atmosphere with titanium powder, the in situ metal matrix composite structure reinforced by TiCN particles was formed. The laser alloying process of ductile cast iron caused the increased hardness and erosion resistance of the surface.

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Properties of Flame Spraying Coatings Reinforced with Particles of Carbon Nanotubes

Cited by 7 publications

References 47 publications

High-Temperature Corrosion of Flame-Sprayed Power Boiler Components with Nickel Alloy Powders

High-Temperature Corrosion of Flame-Sprayed Power Boiler Components with Nickel Alloy Powders

In-situ production of WC-Ni using a laser cladding technique

The Laser Alloying Process of Ductile Cast Iron Surface with Titanium Powder in Nitrogen Atmosphere

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