HVOF sprayed WC–Co coatings: Microstructure, mechanical properties and friction moment prediction

Sahraoui, Tahar; Guessasma, Sofiane; Jeridane, M. Ali; Hadji, Mohamed

doi:10.1016/j.matdes.2009.08.037

Cited by 60 publications

(32 citation statements)

References 40 publications

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“…The heat required to melt the binder phase often results in the deterioration of the carbide and binder phases by decarburization, phase changes, high temperature oxidation and grain growth [1][2][3][4][5][6][7]. Brittle and hard W 2 C, W and undesirable η phases are usually the result of this deterioration, which decreases the overall mechanical and wear properties of the coatings [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Cold gas dynamic spraying of WC–Ni cemented carbide coatings

Sacks

Botef

2015

International Journal of Refractory Metals and Hard Materials

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Section: Introductionmentioning

confidence: 99%

“…This process involves limited to no melting during coating deposition; thus avoiding the decomposition of the carbide phase. The chemical composition and bulk properties of the coatings typically remain identical to the parent powders [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Cold gas dynamic spraying of WC–Ni cemented carbide coatings

Sacks

Botef

2015

International Journal of Refractory Metals and Hard Materials

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“…The fracture toughness K c was calculated according to the Wilshaw Eq. (1) [26] (the result was the average value of ten measurements), where P, a and c are the load of Huayin HV5 type Vickers hardness meter (5 kg), half the length of indentation diagonal and half the length of the crack, respectively.…”

Section: Characterizationmentioning

confidence: 99%

Structure of Micro-nano WC-10Co4Cr Coating and Cavitation Erosion Resistance in NaCl Solution

Ding

Cheng

Yuan

et al. 2017

Chin. J. Mech. Eng.

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Cavitation erosion (CE) is the predominant cause for the failure of overflow components in fluid machinery. Advanced coatings have provided an effective solution to cavitation erosion due to the rapid development of surface engineering techniques. However, the influence of coating structures on CE resistance has not been systematically studied. To better understand their relationship, micro-nano and conventional WC-10Co4Cr cermet coatings are deposited by high velocity oxygen fuel spraying(HVOF), and their microstructures are analyzed by OM, SEM and XRD. Meanwhile, characterizations of mechanical and electrochemical properties of the coatings are carried out, as well as the coatings' resistance to CE in 3.5 wt % NaCl solution, and the cavitation mechanisms are explored. Results show that micro-nano WC-10Co4Cr coating possesses dense microstructure, excellent mechanical and electrochemical properties, with very low porosity of 0.26 ± 0.07% and extraordinary fracture toughness of 5.58 ± 0.51 MPaÁm 1/2 . Moreover, the CE resistance of micro-nano coating is enhanced above 50% than conventional coating at the steady CE period in 3.5 wt % NaCl solution. The superior CE resistance of micronano WC-10Co4Cr coating may originate from the unique micro-nano structure and properties, which can effectively obstruct the formation and propagation of CE crack. Thus, a new method is proposed to enhance the CE resistance of WC-10Co4Cr coating by manipulating the microstructure.

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“…Among the several technologies for depositing metallic coatings on metallic substrates, thermal spray high-velocity oxygen-fuel (HVOF) is one of the most versatile [8] and efficient technologies, with many multiscale features [9,10], capacity to produce homogeneous [11] and very dense coatings [12][13][14][15][16][17] with porosity levels typically in the range 0.1-2% [13], low oxide content [11,12], high hardness [13,18], excellent bond strength frequently exceeding 69 MPa [11,13,19], and low decarburization [13,20]. Also, the low gas temperature of particles avoids superheating during flight and preserves the nanocrystalline structure of the starting powders of the coating [21].…”

Section: Introductionmentioning

confidence: 99%

Ni‐Ti Shape Memory Alloy Coatings for Structural Applications: Optimization of HVOF Spraying Parameters

Crescenzo

Karatza

Musmarra

et al. 2018

Advances in Materials Science and Engineering

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is work aims at contributing to the development of a revolutionary technology based on shape memory alloy (SMA) coatings deposited on-site to large-scale metallic structural elements, which operate in extreme environmental conditions, such as steel bridges and buildings. e proposed technology will contribute to improve the integrity of metallic civil structures, to alter and control their mechanical properties by external stimuli, to contribute to the stiffness and rigidity of an elastic metallic structure, to safely withstand the expected loading conditions, and to provide corrosion protection. To prove the feasibility of the concept, investigations were carried out by depositing commercial NiTinol Ni50.8Ti (at.%) powder, onto stainless steel substrates by using high-velocity oxygen-fuel thermal spray technology. While the NiTinol has been known since decades, this intermetallic alloy, as well as no other alloy, was ever used as the SMA-coating material. Due to the influence of dynamics of spraying and the impact energy of the powder particles on the properties of thermally sprayed coatings, the effects of the main spray parameters, namely, spray distance, fuel-to-oxygen feed rate ratio, and coating thickness, on the quality and properties of the coating, in terms of hardness, adhesion, roughness, and microstructure, were investigated.

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HVOF sprayed WC–Co coatings: Microstructure, mechanical properties and friction moment prediction

Cited by 60 publications

References 40 publications

Cold gas dynamic spraying of WC–Ni cemented carbide coatings

Cold gas dynamic spraying of WC–Ni cemented carbide coatings

Structure of Micro-nano WC-10Co4Cr Coating and Cavitation Erosion Resistance in NaCl Solution

Ni‐Ti Shape Memory Alloy Coatings for Structural Applications: Optimization of HVOF Spraying Parameters

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