Comparison between oxidation kinetics of HVOF sprayed WC–12Co and WC–10Co–4Cr coatings

Jafari, Morad; Salehi, Mehdi; Nahvi, S.M.; Park, C.G.

doi:10.1016/j.ijrmhm.2013.02.006

Cited by 47 publications

(27 citation statements)

References 19 publications

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“…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]. The large differences between the microstructure of sintered WC-Co hardmetals and HVOF-sprayed coatings suggest different oxidation behavior.…”

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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“…4a), oxygen transfer from the gas phase to the clean surface of alloy controls the oxidation rate. 22 The value of the rate constant was increased with increasing oxidation temperature, indicating higher oxidation. The oxidation behaviour of the coating at all temperatures was quite non-linear.…”

Section: Resultsmentioning

confidence: 95%

Improvement in oxidation behaviour of steel by B₄C–TiB₂–TiC–Ni coating

Rafiei

Shamanian

Salehi

et al. 2014

Surface Engineering

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In this study, B 4 C-TiB 2 -TiC-Ni coating was thermally sprayed on the surface of 4130 steel substrate by high velocity oxyfuel (HVOF) torch. Before the HVOF process, the B 4 C-TiB 2 -TiC-Ni powder was prepared by mechanical alloying (MA). In order to study the oxidation behaviour of the coating and 4130 steel, thermogravimetric analysis (TGA) was done. The structural evolution of the samples was investigated by X-ray diffractometry (XRD). The microstructure and elemental analysis of the samples were studied by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The coating showed higher oxidation resistance in comparison with the 4130 steel at high temperatures. It was also found that the dissolution of oxygen in the coating was the rate determining process of the coating oxidation, creating the quasi-cubic kinetic rate.

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“…The coating microstructure is relatively dense. Moreover, the coating contains some pores and microcracks resulting from the high velocity impact of semi-molten in-flight particles to the substrate followed by severe plastic deformation and rapid solidification [14]. The porosity percentage in terms of the area fraction of pores, thickness and average surface roughness (Ra) of the coatings are tabulated in table 2.…”

Section: Resultsmentioning

confidence: 99%

“…The high temperature of the flame causes the dissolution of WC in liquid cobalt followed by carbon oxidizing to form CO/CO 2 . Then, the W 2 C phase precipitates from the W-rich liquid phase binder during cooling [14,15]. Figure 5 shows the cross-sectional SEM micrograph of the sealed coating by sol-gel after 24 h aging and calcination at 500°C.…”

Section: Resultsmentioning

confidence: 99%

Study of alumina sealing of HVOF thermally sprayed WC-Co coatings by sol-gel method

Amousoltani

Salimijazi

Golozar

2019

Mater. Res. Express

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Tungsten carbide (WC) has been known as a hard and wear resistant material. Thermal spray coatings were used widely to deposit Ni and/or Co based WC. The high-velocity oxy-fuel (HVOF) spraying is one of the best methods among thermal spray processes that creates denser coatings with less pores for high corrosive environments applications. In this study, the effect of alumina sealing process on the HVOF WC-12Co coatings by the Sol-Gel method for corrosion and wear properties at high temperature applications was investigated. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were utilized to characterize the morphology and properties of the coatings before and after the sealing process. High temperature wear properties of coatings before and after sealing were tested by ball-on-disk wear tester at 400°C. The cross-section of the sealed coatings showed that open pores were filled after sol gel. The thickness of the sealed layer was about 14 μm. Results indicated that the sealing process increased the microhardness of coating slightly from 1160±160 to 1250±150 HV. Comparing the results of polarization in 3.5 wt% NaCl solution and wear test showed that the corrosion current density decreased and the wear resistance increased after sealing. A sealed sample with filled open porosity led to recording a higher corrosion resistance (2.9±0.7 μA cm −2 ) compared to the as sprayed coating (8.90±0.5 μA cm −2 ). The friction profile of the sealed coating showed reduction of the friction coefficient between 0.25 and 0.5 in comparison to the as-sprayed coating at room temperature (04-0.6). Also, the high temperature wear behavior of the sealed coatings was improved. The weight loss was much lower for the sealed coating (5 mg) than that for the as-sprayed coating (13 mg).

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Comparison between oxidation kinetics of HVOF sprayed WC–12Co and WC–10Co–4Cr coatings

Cited by 47 publications

References 19 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

Improvement in oxidation behaviour of steel by B₄C–TiB₂–TiC–Ni coating

Study of alumina sealing of HVOF thermally sprayed WC-Co coatings by sol-gel method

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Comparison between oxidation kinetics of HVOF sprayed WC–12Co and WC–10Co–4Cr coatings

Cited by 47 publications

References 19 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

Improvement in oxidation behaviour of steel by B4C–TiB2–TiC–Ni coating

Study of alumina sealing of HVOF thermally sprayed WC-Co coatings by sol-gel method

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Improvement in oxidation behaviour of steel by B₄C–TiB₂–TiC–Ni coating