Application of a high temperature self-lubricating composite coating on steam turbine components

Wang, Wenchao

doi:10.1016/j.surfcoat.2003.06.025

Cited by 49 publications

(32 citation statements)

References 6 publications

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“…On the one hand, CeO 2 with hexagonal layered structure has excellent lubrication function and stable chemical properties at high temperature [4,5,8,10,11], helping to decrease friction. On the other hand, due to friction-induced heat and high-temperature effect, Cr 3 C 2 could be decomposed to generate chrome oxide (Cr 2 O 3 ) presenting the high-temperature self-lubricating effect [28][29][30][31], which may play an important role in low friction at high temperature. Figures 7 and 8 present the friction coefficients and wear rates of four types of coatings at different test temperatures, respectively.…”

Section: Friction and Wear Behaviormentioning

confidence: 99%

Sliding Wear Behavior of HVOF-sprayed Cr3C2–NiCr/CeO2 Composite Coatings at Elevated Temperature up to 800 °C

et al. 2009

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Four types of Cr 3 C 2 -NiCr coatings containing different fractions of CeO 2 additive were deposited using high velocity oxy-fuel spraying. Hardness tester, X-ray diffractometer, contact surface profiler, and scanning electron microscope equipped with energy dispersive spectrometer were employed to characterize the microhardness, phase composition, surface roughness, and microstructure of as-sprayed coatings. At the same time, the friction and wear behavior of the as-sprayed coatings sliding against Si 3 N 4 ball at room temperature and elevated temperature of 400 or 800°C under unlubricated condition was evaluated using an oscillating friction and wear tester. The worn surfaces of the composite coatings and Si 3 N 4 counterpart balls were analyzed by means of scanning electron microscopy, X-ray diffraction, and three dimensional non-contact surface profiler. The friction and wear mechanisms of the coatings with and without CeO 2 additive were comparatively discussed. Results show that the composite coatings doped with CeO 2 had better wear-resistance than that without CeO 2 , and the coating containing 4 wt% CeO 2 showed the best wear-resistant property. The improved wear-resistant properties of the composite coatings doped with CeO 2 were attributed to the refined microstructure and improved mechanical properties induced by CeO 2 .

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Section: Friction and Wear Behaviormentioning

confidence: 99%

Sliding Wear Behavior of HVOF-sprayed Cr3C2–NiCr/CeO2 Composite Coatings at Elevated Temperature up to 800 °C

et al. 2009

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“…In the past 40 years, the PS100, PS200, PS300 and PS400 families of plasma sprayed coatings with self-lubricating behavior were developed at NASA Lewis Research Center (shown in Table 2) [11,113,[117][118][119][120][121]. The PS100 family of nickel-glass-solid lubricant-containing coatings pioneered the concept of combining the functions of individual constituents to produce a composite solid lubricant coating.…”

Section: Ps High Temperature Self-lubricating Coatingsmentioning

confidence: 99%

High Temperature Self-Lubricating Materials

Bi¹,

Zhu²,

Liu³

2013

Tribology in Engineering

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“…Over the years, a large number of solid tribological materials and coatings, e.g. laminar solids, oxides, soft metals, composite materials, etc., have been developed to cover a wide variety of requirements [1][2][3][4]. Nevertheless, due to limitations of properties of individual materials and the multiplicity of industrial demands new materials are required.…”

Section: Introductionmentioning

confidence: 99%

Effect of Applied Load and Surface Roughness on the Tribological Properties of Ni-Based Superalloys Versus Ta2AlC/Ag or Cr2AlC/Ag Composites

2008

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The novel Ta 2 AlC-20 vol.% Ag (TaAg) and Cr 2 AlC-20 vol.% Ag (CrAg) composites were tribologically tested versus a Ni-based superalloy Inc718 (SA) by dry sliding at a sliding speed of 1 m/s at room temperature in air at loads from 3 N to 18 N. The TaAg composites were also tested at 8 and 18 N at 550°C, and at a 3 N load against the SA with different surface roughnesses at 26°C and 550°C. At room temperatures, the coefficients of friction, l's, decreased from *0.8-0.9 to *0.3-0.4 for both the TaAg and CrAg composites as the applied normal force increased from 3 N to 8 N. Further increases in load to 18 N did not change the l's. The specific wear rates, sWR, increased with increased loads for the TaAg composite; they remained almost unchanged for the CrAg composite. This behavior was attributed to the formation of glaze tribofilms-similar to ones observed previously in these tribocouples at elevated temperatures and 3 N-promoted by the increased loads. Preconditioning of the SA surface by sliding against the TaAg composite at 550°C and 8 N resulted in l's of \0.2 and sWR \ 10 -6 mm 3 /N-m in subsequent room temperature sliding at 3 N. Somewhat higher, but stable room temperature l's of *0.3 and sWR of *3 9 10 -5 mm 3 /N-m were observed when the TaAg composites were slid versus a sandblasted SA surface at 500°C and 3 N. It follows that in situ preconditioning of the tribo-surfaces is a powerful tool for improving the properties of the MAX/Ag-SA tribocouples. The relationship between sliding conditions, chemistries of tribofilms, and their properties are discussed.

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Application of a high temperature self-lubricating composite coating on steam turbine components

Cited by 49 publications

References 6 publications

Sliding Wear Behavior of HVOF-sprayed Cr3C2–NiCr/CeO2 Composite Coatings at Elevated Temperature up to 800 °C

Sliding Wear Behavior of HVOF-sprayed Cr3C2–NiCr/CeO2 Composite Coatings at Elevated Temperature up to 800 °C

High Temperature Self-Lubricating Materials

Effect of Applied Load and Surface Roughness on the Tribological Properties of Ni-Based Superalloys Versus Ta2AlC/Ag or Cr2AlC/Ag Composites

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