Installations for producing electrospark erosion- and abrasion-resistant coatings on the blades of steam turbines of thermal and nuclear power plants

Belyakov, A. V.; Горбачев, А. Н.; Mikhailov, V. V.; Reutov, B. F.; Fokin, A. A.

doi:10.3103/s1068375517030036

Cited by 3 publications

(2 citation statements)

References 5 publications

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“…The critical components of many mechanical devices are bound to experience temperature variation (temperature cycle) during service. In these tough service conditions, surface damage or thermal fatigue cracking in the form of abrasion, erosion, corrosion, and heat-checking can be observed [17][18][19][20]. Thermal fatigue failure is one of the main reasons for the damage of parts, thus leading to time waste and economic loss.…”

Section: Introductionmentioning

confidence: 99%

Thermal Fatigue Failure Behavior of Surface/Interface of Plasma Cladding Layer

Tan

Guo

et al. 2019

Coatings

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Co-based coating was prepared by plasma cladding on FV520B substrates. Microstructure of the coatings was observed by scanning electron microscope. Finite element simulation as a predictive method to research the stress distributed after thermal cycling. Thermal fatigue resistance of the coating-substrate was evaluated at temperature of 600 °C, 700 °C, 800 °C, and 900 °C. Results indicate that the surface/interface structure has excellent thermal fatigue resistance at 600 °C, and the thermal fatigue crack initiated near the interface and extended along the grain boundary. The difference of expansion coefficient of the coating and substrate is small near 600 °C, and the difference increased when the temperature climbed above 600 °C. The diffuse elements could be found near the interface after the thermal cycle, and the dislocations and precipitated phase were observed.

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Section: Introductionmentioning

confidence: 99%

Thermal Fatigue Failure Behavior of Surface/Interface of Plasma Cladding Layer

Tan

Guo

et al. 2019

Coatings

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“…The need nuclear engineering is to improve the characteristics of ferrous and non-ferrous materials by innovation of layers resistant to hydrogen irradiation, permeation and embrittlement [1][2]. Also the need for resistant layers with the interaction of hydrogen are of interest for industries petroleum, naval, automotive and agriculture, which need innovative materials with layers to mitigate the effect of hydrogen [3][4].…”

mentioning

confidence: 99%

Analysis Microstructural on Gray Cast Iron Boriding and Hydrogen of Permeation

et al. 2019

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TaC-based wear-resistant coatings obtained by magnetron sputtering and electro-spark deposition for wedge gate valve protection

Sytchenko,

Fatykhova,

Kuznetsov

et al. 2023

Izv. VUZ. Poroshk. Met.

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Ta–Zr–Si–B–C coatings were deposited by magnetron sputtering (MS) of a TaSi2–Ta3B4–(Ta, Zr)B2 multi-component target in an Ar + C2H4 gas mixture. TaC–Cr–Mo–Ni based coatings were obtained by electro-spark deposition (ESD) using TaC–Cr–Mo–Ni electrode. The composition and structure of the coatings were studied using scanning electron microscopy, energy-dispersive spectroscopy, glow discharge optical emission spectroscopy and X-ray diffraction. Mechanical and tribological properties of coatings were determined using nanoindentation and pin-on-disk tests. The study showed that the coatings have a homogeneous and defect-free structure, with the main structural component being the fcc-TaC phase. The MS coating exhibited a 30 % higher concentration of the TaC phase compared to the ESD coating. The TaC crystallite sizes for the MS and ESD coatings were 3 and 30 nm, respectively. The presence of a high fraction of the carbide phase and small crystallite size for the MS coating resulted in superior hardness (H = 28 GPa) compared to the ESD sample (H = 10 GPa). Both coatings exhibited similar values of the friction coefficient (about 0.15) and demonstrated reduced wear rates (<10–7 mm3/(N·m)). The deposition of coatings on a steel substrate led to a decrease in the friction coefficient by five times and the wear rate by four orders of magnitude. Pilot tests were conducted on coatings applied to wedge gate valve of shut-off devices used in the oil and gas industry for pumping liquids. The results indicated that the service life of the steel wedge gate valve increased by 25 and 70 % with deposited MS and ESD coatings, respectively.

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Installations for producing electrospark erosion- and abrasion-resistant coatings on the blades of steam turbines of thermal and nuclear power plants

Cited by 3 publications

References 5 publications

Thermal Fatigue Failure Behavior of Surface/Interface of Plasma Cladding Layer

Thermal Fatigue Failure Behavior of Surface/Interface of Plasma Cladding Layer

Analysis Microstructural on Gray Cast Iron Boriding and Hydrogen of Permeation

TaC-based wear-resistant coatings obtained by magnetron sputtering and electro-spark deposition for wedge gate valve protection

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