Thermo-reactive deposition processed vanadium carbide coating: growth kinetics model and diffusion mechanism

Fan, Xianqiang; Yang, Zhigang; Zhang, C.; Zhang, Y.D.

doi:10.1016/j.surfcoat.2012.08.010

Cited by 34 publications

(6 citation statements)

References 30 publications

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“…The results are summarized in Table IV. For V6C5 coating growth, the results well compare to those previously published [2,27]; conversely, for chromium carbide the activation energy is lower than that measured by Sen [16]. This difference can be related to the different substrate (AISI 4140\ AISI D2) and TRD techniques used (molten salts/pack method).…”

Section: Resultssupporting

confidence: 80%

See 1 more Smart Citation

Chromium and vanadium carbide and nitride coatings obtained by TRD techniques on UNI 42CrMoS4 (AISI 4140) steel

Biesuz

Sglavo

2016

Surface and Coatings Technology

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Section: Resultssupporting

confidence: 80%

“…The ceramic layer thickness was modelled by a diffusion-based law, in agreement with several previous works [2,3,[14][15][16][17][31][32][33][34][35][36]. In fact, the coating growth is determined by the reaction between carbon and CFE at the coating-liquid phase interface.…”

Section: Resultssupporting

confidence: 73%

Chromium and vanadium carbide and nitride coatings obtained by TRD techniques on UNI 42CrMoS4 (AISI 4140) steel

Biesuz

Sglavo

2016

Surface and Coatings Technology

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“…For instance, the thermodynamic study of the growth law during the in situ formation of the reinforcement layers can reveal their formation mechanism and verify the accuracy of the experimental results. For example, M Labonne [19] et al calculated the grain growth constant KD of NbC by evaluating the NbC particle size in cemented NbC-12vol% Ni carbide after sintering at 1360 °C Fan [20] et al described the growth kinetics of vanadium carbide coatings on steel surfaces during thermal reactive deposition/diffusion (TRD) by deriving the following mathematical model. Zhong [21] et al reported the preparation of tungsten carbide reinforced ironbased surface composites by in situ solid-phase diffusion method, and analyzed the dynamics of the tungsten carbide-iron layer by measuring its thickness variation with heat treatment time and temperature.…”

Section: Introductionmentioning

confidence: 99%

Thermal/kinetic study of the formation mechanism of NbC-Fe composite layer on the surface of GCr15 prepared by hot pressure diffusion

Zhao

Yao

Wang

et al. 2023

Mater. Res. Express

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In this study, an NbC-Fe composite layer is in-situ prepared on the surface of GCr15 bearing steel. The formation mechanism of the composite layer was investigated in terms of thermodynamics, dynamics, and crystal structure transformation processes during the in-situ reaction. According to computational thermodynamics, the reaction at 1150-1200℃ allows NbC, Fe3C, Cr3C2, Cr7C3, and Cr23C6 phases to spontaneously react and stabilize in the Fe-C-Nb-CR system. The functional relationship between the growth thickness, time, and temperature of the NbC-Fe composite layer was obtained experimentally and via computational dynamics. Particularly, the growth activation energy, Q, of the NbC-Fe composite layer was calculated to be 367.06 kJ/mol. The combination of computational thermodynamic/kinetic research and experimental observation of crystal transformation data revealed that the formation mechanism of NbC in the NbC-Fe layer on the surface of GCr15 caused the C atoms in the bearing steel diffuse into the Nb plate and occupy the octahedral gap of the Nb unit cell to form NbC. In the formation mechanism of the NbC-Fe composite layer, C and Fe atoms partially migrated from the pearlite and diffused towards the direction of the Nb plate to form the NbC-Fe composite layer.

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“…The wear resistance and hardness of layers containing carbides obtained by TRD have been analyzed [9]- [12], and those layers have been reported to have good tribological properties. X. S. Fan et al [13], [14] recently studied the growth mechanism and microstructure of carbides prepared using TRD, analyzed the effect of the carbon activity in the growth of these coatings on AISI H13 and AISI 9Cr18 steel, and developed a mathematical model to explain this effect. The aim of the present work is to analyze the corrosion resistance of niobium carbide coatings grown on AISI D2 and AISI H13 steels using a TRD system with electrochemical techniques…”

Section: Introductionmentioning

confidence: 99%

Niobium carbide coatings produced on tool steels via thermo-reactive diffusion

Guerrero

Flórez

Orjuela

2018

IyU

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Objective: In this work, niobium carbide (NbC) coatings were deposited on substrates of the tool steels AISI H13 and AISI D2 using thermo-reactive deposition/diffusion (TRD) in order to analyze their behavior against corrosion in a saline environment. Materials and methods: The niobium carbides were obtained using salt baths composed of borax pentahydrate, aluminum and ferroniobium. This mixture was heated at 1050 °C for 4 hours. The chemical composition was determined by X-ray fluorescence (XRF). The coatings were morphologically characterized using scanning electron microscopy (SEM), the crystal structure was analyzed using X-ray diffraction (XRD), and the electrochemical behavior was studied using potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS). Results and discussion: The XRF analysis indicated that the coatings contained 87.476 wt% Nb and 51.943 wt% Nb for the D2-substrate and the H13-substrate, respectively. The SEM images revealed that the morphology of the surface of the coatings was homogeneous. The XRD analysis established that the coatings were polycrystalline, and the electrochemical tests established that the corrosion resistance increased slightly in the covered substrates with respect to the uncoated steels, with the best results being obtained in the layers of niobium carbide deposited on AISI D2 steel. Conclusions: The analysis of corrosion resistance revealed that the coatings prepared on D2 steel have a higher corrosion resistance because they have fewer surface imperfections, which causes the coating to exhibit a dielectric behavior.

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Thermo-reactive deposition processed vanadium carbide coating: growth kinetics model and diffusion mechanism

Cited by 34 publications

References 30 publications

Chromium and vanadium carbide and nitride coatings obtained by TRD techniques on UNI 42CrMoS4 (AISI 4140) steel

Chromium and vanadium carbide and nitride coatings obtained by TRD techniques on UNI 42CrMoS4 (AISI 4140) steel

Thermal/kinetic study of the formation mechanism of NbC-Fe composite layer on the surface of GCr15 prepared by hot pressure diffusion

Niobium carbide coatings produced on tool steels via thermo-reactive diffusion

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