Fundamentals of Thermal Spraying, Flame and Arc Spraying

Babiak, Z.; Wenz, Thomas; Engl, L.

doi:10.1002/3527608818.ch8

Cited by 8 publications

(3 citation statements)

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“…Two of the three TWAS coatings were prepared from wires of the same alloys (the anode and cathode were made of the same additive material)-in the first case, it was Alloy 625, and in the second case, it was 45CT material. The third one was made of a so-called pseudo-alloy [9], which was prepared by feeding a spraying jet with two different wires which were simultaneously melted in an electric arc, forming a mixture of the two alloys-schemes are shown in Figure 1a. The anode was made of an alloy 625 wire, while the cathode consisted of a NiCrMoB wire.…”

Section: Thermally Sprayed Coatingsmentioning

confidence: 99%

High-Temperature Corrosion of Nickel-Based Coatings for Biomass Boilers in Chlorine-Containing Atmosphere

2022

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As there is a strong pressure in the EU to reduce CO2 emissions and overall fossil fuel consumption in the energy sector, many boilers are burning biomass instead of traditional fuels (coal, natural gas, oil, etc.). This is mainly due to the EU 2030 energy strategy, which commits Member States to reduce fossil fuel emissions by at least 40% (compared to the 1990 level) and to use at least 32% of renewable energy. The combustion of biomass containing aggressive elements such as chlorine or sulfur causes serious damage to various boiler components, with negative impacts such as reduced boiler lifetime, increased investments and maintenance costs, reduced availability, and others. These problems occur mainly in plants/boilers designed to burn coal and redesigned to burn biomass (straw, wood chips, wood pellets, etc.). In this paper, the corrosion resistance of heat coatings determined in long-term laboratory tests in an environment specifically corresponding to biomass flue gas is presented. These results can be used to design a suitable modification of existing coal boilers using conventional materials. The aim was to compare three completely different technologies currently available on local markets for the preparation of these coatings—thin wire arc spray (TWAS), high-velocity oxygen fuel (HVOF), and water-stabilized plasma. These coatings were compared with the base material of the boiler tubes—low alloyed steel 16Mo3 and high alloyed austenitic stainless steel AISI 310 as a more expensive option for retrofit. After 5000 h of exposure in an environment containing HCl and SO2, no cracks or structural defects were observed in any of the coatings, and the substrate material showed no signs of oxidation. All the tested coatings had higher corrosion resistance than the 16Mo3 material, and some of them presented a corrosion behavior close to that of the high alloy AISI 310 steel. Structurally and corrosion-wise, the thermally sprayed coating prepared by HVOF technology was the best of all tested materials.

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Section: Thermally Sprayed Coatingsmentioning

confidence: 99%

High-Temperature Corrosion of Nickel-Based Coatings for Biomass Boilers in Chlorine-Containing Atmosphere

2022

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“…Plasma-spray is a process for formation coating on substrates whereby a feedstock is rapidly heated to a molten or near-molten state, and a gas are use to propel the material toward suitably prepared substrate. The most prominent advantages of this method are virtually any coating material can be used and any substrate material can be coated with low thermal stress on substrate parts and high deposition rates [1]. The coating characteristic can be controlled by varying the process variables such as input powers, material feed rates, gas pressures, surface preparation of the substrate and spray distance [2].…”

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confidence: 99%

Characterisations of Cu-Based Coated Al7075 via Plasma-Spray Technique

Ghazali

Kamal

Abdullah

2011

KEM

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This work aims to characterise a Cu-based coating material on Al-7075 by using a plasma-spray technique in order to enhance the surface properties of components for automotive applications. Plasma-spray is a process for formation coating on substrates whereby a feedstock is rapidly heated to a molten or near-molten state, and a gas are use to propel the material toward suitably prepared substrate. The most prominent advantages of this method are virtually any coating material can be used and any substrate material can be coated with low thermal stress on substrate parts and high deposition rates [1]. The coating characteristic can be controlled by varying the process variables such as input powers, material feed rates, gas pressures, surface preparation of the substrate and spray distance [2]. The effect of crucial parameters like the electric power input to plasma, spray rate and substrate roughness were studied. The experiments of spraying were design using a 23 fractional factorial plan. The plan allows studying the effect of each factor on the response variables, as well as the effect of interactions between factors on the response variable at the least number of experiment runs. The coating layers have been characterised with respect to the structure by using a scanning electron microscopy (SEM). The result indicates that sprayed particles cool and built up into pancake-like shapes splat, characteristic a plasma spray electric process products. It was found that the optimum parameters were obtained at a power of 24.6 kW, with a powder feed rate of 1 rpm and substrate roughness of 0.5µm.

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“…Atsižvelgiant į tai, kokį rezultatą siekiama gauti, pasirenkamas tinkamiausias purkštinių dangų formavimo būdas. Kadangi metodai ir procesai nuolat yra tobulinami, klasifikacijos grupės kartas nuo karto pasipildo naujais pogrupiais (Babiak et al, 2006;Gonzalez, 2007;Simunovic, 2010;Gargasas, 2011;Erne et al, 2012;Škamat, 2013;Tejero-Martin et al, 2019).…”

Section: Terminio Purškimo Technologijų Apžvalgaunclassified

Metalo keraminių dangų su volframo karbidais lazerinis apdorojimas ir tyrimai

Decker

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Disertacija rengta 2017-2024 metais Vilniaus Gedimino technikos universitete. Vadovas prof. dr. Olegas ČERNAŠĖJUS (Vilniaus Gedimino technikos universitetas, Medžiagų inžinerija -T 008). Vilniaus Gedimino technikos universiteto Medžiagų inžinerijos mokslo krypties disertacijos gynimo taryba: Pirmininkas doc. dr. Justinas GARGASAS (Vilniaus Gedimino technikos universitetas, Medžiagų inžinerija -T 008). Nariai: prof. dr. Onder ALTUNTAS (Eskišehiro technikos universitetas, Turkijos respublika, Transporto inžinerija -T 003), prof. dr. Audrius ČEREŠKA (Vilniaus Gedimino technikos universitetas, Mechanikos inžinerija -T 009), dr. Viktor GRIBNIAK (Vilniaus Gedimino technikos universitetas, Medžiagų inžinerija -T 008), dr. Rasa KANDROTAITĖ JANUTIENĖ (Kauno technologijos universitetas, Medžiagų inžinerija -T 008). Disertacija bus ginama viešame Medžiagų inžinerijos mokslo krypties disertacijos gynimo tarybos posėdyje 2024 m. birželio 10 d. 14 val. Vilniaus Gedimino technikos universiteto SRA-I posėdžių salėje.

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Fundamentals of Thermal Spraying, Flame and Arc Spraying

Cited by 8 publications

References 0 publications

High-Temperature Corrosion of Nickel-Based Coatings for Biomass Boilers in Chlorine-Containing Atmosphere

High-Temperature Corrosion of Nickel-Based Coatings for Biomass Boilers in Chlorine-Containing Atmosphere

Characterisations of Cu-Based Coated Al7075 via Plasma-Spray Technique

Metalo keraminių dangų su volframo karbidais lazerinis apdorojimas ir tyrimai

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