Structural and oxidation behavior of atmospheric heat treated plasma sprayed WC–Co coatings

Ghadami, F.; Ghadami, S.; Abdollah-Pour, Hassan

doi:10.1016/j.vacuum.2013.01.019

Cited by 47 publications

(12 citation statements)

References 15 publications

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“…seats and gates in petroleum industry and pinch rolls in steel rolling industry [5][6][7][8]. In several applications such as copper crystallizer plates and pinch-rolls in hot rolling of steels, the applied WC-Co coatings are simultaneously exposed to high temperature and stress [9][10][11]; therefore, in addition to wear resistance, a suitable oxidation resistance is required to prevent oxidation-induced degradation of the cermet coatings. However, there is a little information in the literature about the high temperature oxidation behavior of WC-Co coatings [9,12], and most of the published data refer to the sintered WC-Co hardmetals [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

High temperature oxidation behavior of micro/nanostructured WC-Co coatings deposited from Ni-coated powders using high velocity oxygen fuel spraying

Jafari

Salehi

Nahvi

et al. 2016

Surface and Coatings Technology

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Section: Introductionmentioning

confidence: 99%

High temperature oxidation behavior of micro/nanostructured WC-Co coatings deposited from Ni-coated powders using high velocity oxygen fuel spraying

Jafari

Salehi

Nahvi

et al. 2016

Surface and Coatings Technology

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“…In the current study, the surface of substrates was polished with a fine emery paper (number 800) to prepare a smooth surface before the spraying. Regarding obtained results from our previous studies 22 , 32 – 34 , the air-cooled HVOF torch was used for the spraying process. The spraying parameters are summarized in Table 3 .…”

Section: Methodsmentioning

confidence: 99%

A comprehensive study on the microstructure evolution and oxidation resistance of conventional and nanocrystalline MCrAlY coatings

Ghadami

Rouhaghdam

Ghadami

2021

Sci Rep

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Conventional and nanocrystalline MCrAlY coatings were applied by the high-velocity oxy-fuel (HVOF) deposition process. The ball-milling method was used to prepare the nanocrystalline MCrAlY powder feedstock. The microstructure examinations of the conventional and nanocrystalline powders and coatings were performed using X-ray diffraction (XRD), high-resolution field emission scanning electron microscope (FESEM) equipped with energy-dispersive X-ray spectroscopy (EDX), transmission electron microscope (TEM), and X-ray photoelectron spectroscopy (XPS). Williamson–Hall analyzing method was also used for estimation of the crystalline size and lattice strain of the as-milled powders and sprayed coatings. Owing to the investigation of the oxidation behavior, the freestanding coatings were subjected to isothermal and cyclic oxidation testing at 1000 and 1100 °C under static air. The results showed that the conventional as-sprayed MCrAlY coating had a parabolic behavior in the early stage and prolonged oxidation process. On the contrary, in the case of the nanocrystalline MCrAlY coating, the long-term oxidation behavior has deviated from parabolic to sub-parabolic rate law. Moreover, the results also exemplified that the nanocrystalline MCrAlY coating had a greater oxidation resistance following the creation of a continuous and slow-growing Al2O3 scale with a fine-grained structure. The nucleation and growth mechanisms of the oxides formed on the nanocrystalline coating have also been discussed in detail.

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“…Advanced ceramics and protective coatings for high temperature applications have been recently attracted [1][2][3][4][5][6][7][8][9][10][11] . With a high melting point (about 3380 °C), high thermal and electrical conductivity, excellent strength at the severe environment, and brilliant thermal shock resistance, HfB 2 is one of the ultra-high temperature ceramics (UHTCs).…”

Section: Effect Of In Situ Vsi 2 and Sic Phases On The Sintering Behamentioning

confidence: 99%

Effect of in situ VSi2 and SiC phases on the sintering behavior and the mechanical properties of HfB2-based composites

Ghadami

Taheri-Nassaj

Baharvandi

et al. 2020

Sci Rep

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In situ HfB2–SiC–VSi2 composite was fabricated by reactive pressureless sintering at the temperature of 2150 °C for 4 h under a vacuum atmosphere. In situ SiC and VSi2 reinforcements were formed using VC and Si powders as starting materials according to the following reaction: VC + 3Si = SiC + VSi2. Microstructural studies and thermodynamic calculations revealed that in situ VSi2 and SiC phases were mostly formed and homogeneously distributed in HfB2 skeleton. The results showed that the density of in situ HfB2–SiC–VSi2 composite was 98%. Besides, the mechanical properties of the composite were effectively enhanced by the formation of in situ second phases. The Vickers hardness and the fracture toughness of the composite reached 20.1 GPa and 5.8 MPa m−1/2, respectively.

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Structural and oxidation behavior of atmospheric heat treated plasma sprayed WC–Co coatings

Cited by 47 publications

References 15 publications

High temperature oxidation behavior of micro/nanostructured WC-Co coatings deposited from Ni-coated powders using high velocity oxygen fuel spraying

High temperature oxidation behavior of micro/nanostructured WC-Co coatings deposited from Ni-coated powders using high velocity oxygen fuel spraying

A comprehensive study on the microstructure evolution and oxidation resistance of conventional and nanocrystalline MCrAlY coatings

Effect of in situ VSi2 and SiC phases on the sintering behavior and the mechanical properties of HfB2-based composites

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