Erosion-corrosion of thermal sprayed coatings in FBC boilers

Buqian, Wang

doi:10.1016/0043-1648(96)06972-4

Cited by 67 publications

(28 citation statements)

References 6 publications

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“…The porosity values of D-gun sprayed coatings are very much lower (<0.8%) than that of HVOF sprayed Cr 3 C 2 -NiCr coating as reported in the literature [24][25][26][27][28]. The residual fuel used in heat engines such as gas turbines, boilers, and refinery furnaces contains sodium, vanadium and sulphur as impurities.…”

Section: Introductionmentioning

confidence: 86%

Hot corrosion behavior of detonation gun sprayed Cr3C2–NiCr coatings on Ni and Fe-based superalloys in Na2SO4–60% V2O5 environment at 900°C

Kamal

Jayaganthan

Prakash

et al. 2008

Journal of Alloys and Compounds

140

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Section: Introductionmentioning

confidence: 86%

Hot corrosion behavior of detonation gun sprayed Cr3C2–NiCr coatings on Ni and Fe-based superalloys in Na2SO4–60% V2O5 environment at 900°C

Kamal

Jayaganthan

Prakash

et al. 2008

Journal of Alloys and Compounds

140

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“…Alumina as-sprayed coatings manufactured with +22 -45 µm and +5 -20 µm particle size distributions exhibited good dielectric strengths after thermal solicitations compared to coatings manufactured with bigger size distributions or to graded titania coatings. Wang (1996), Guilemany et al (2007). To protect substrates from hot corrosion Shidu et al (2007) studied WCNiCrFeSiB coatings HVOF sprayed to provide nickel and iron-based super alloys with the necessary resistance against oxidation and hot corrosion under the given environmental conditions at 800 °C.…”

Section: Other Industriesmentioning

confidence: 99%

“…The addition of approximately 20 wt % chromia results in the formation of one solid solution of (Al-Cr) 2 O 3 in the α-phase modification; working temperatures can reach 1000 °C and the transformation of γ phase starts around 900 °C. -HVOF sprayed Cr 3 C 2 -NiCr coatings with high compactness and fine grain size, Wang (1996). The wear resistance is due to the particles of hard carbide homogeneously distributed within the coating, the ductile matrix being corrosive-resistant.…”

Section: Electrical Utilitiesmentioning

confidence: 99%

Thermal Sprayed Coatings Used Against Corrosion and Corrosive Wear

Fauchais¹,

Vardelle²

2012

Advanced Plasma Spray Applications

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“…The degradation processes might further have been accelerated by cracks, which were present at an interval of about 208 around the tube periphery ranging all the way from the coating surface to the coating/substrate interface. Through these, which had probably formed already during the deposition process and have been observed in other studies [19], rapid diffusion paths are created. It should be noted that a Metco 3007 coating has been subjected to partial degradation in a previous exposure performed in the same CFB plant but under different conditions [8].…”

Section: Discussionmentioning

confidence: 95%

Erosion‐corrosion of laser and thermally deposited coatings exposed in fluidised bed combustion plants

Hjörnhede¹,

Sotkovszki²,

Nylund³

2006

Materials & Corrosion

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Coated low alloyed steel tubes were exposed in two combustion power plants of the type Circulating Fluidised Bed (CFB) and Pressurised Fluidised Bed Combustion (PFBC). The power plants were fired with wood chips and coal with a small addition of olive seeds, respectively. In addition to laser coating two thermal spray techniques were used; arc-spray (air as carrier gas) and High Velocity Oxy Fuel (HVOF). The sample locations in the PFBC plant were at the highest and lowest loops of a platen immersed in the fluidising bed. The material temperatures in each loop were 450 C and 400 C, respectively. The exposure lasted over two firing seasons for a total time of 8089 h. In the CFB plant a probe was located at the cyclone entrance where the material temperature was 630 C for an exposure time of about 2100 h before being reduced to 480 C for a further 920 h. The material wastage was determined from metallographic studies on cross-sections of rings cut from the exposed tubes. The nature and chemical composition of the corrosion products and deposits formed were determined by SEM/EDX, Auger spectroscopy, XPS and XRD. Cobalt based coatings show the best performance in both the PFBC plant and the CFB plant, while nickel based coatings are resistant to a corrosive atmosphere but very sensitive to erosion. The degree of corrosion is much larger in the CFB plant as is clearly seen from the chromium carbide containing coating, which totally degraded in this environment. Contrary the performance of the same coating was excellent in the fluidised bed due to its high erosion resistance. The material wastage of a coating with a specific composition is independent of the deposition method. No significant differences in spallation behaviour occurred among coatings deposited with the different techniques.

show abstract

Erosion-corrosion of thermal sprayed coatings in FBC boilers

Cited by 67 publications

References 6 publications

Hot corrosion behavior of detonation gun sprayed Cr3C2–NiCr coatings on Ni and Fe-based superalloys in Na2SO4–60% V2O5 environment at 900°C

Hot corrosion behavior of detonation gun sprayed Cr3C2–NiCr coatings on Ni and Fe-based superalloys in Na2SO4–60% V2O5 environment at 900°C

Thermal Sprayed Coatings Used Against Corrosion and Corrosive Wear

Erosion‐corrosion of laser and thermally deposited coatings exposed in fluidised bed combustion plants

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