Comparison of the Mechanical and Electrochemical Properties of WC-25Co Coatings Obtained by High Velocity Oxy-Fuel and Cold Gas Spraying

Couto, Miguel; Dosta, S.; Fernández, J.; Guilemany, J.M.

doi:10.1007/s11666-014-0123-0

Cited by 27 publications

(24 citation statements)

References 14 publications

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“…Moreover, cold sprayed WC-Co coatings were also reported to possess high hardness (ranging from 800 to 2000 HV). Such high coating hardness is comparable to or even higher than that of thermal sprayed coatings [8,10,[12][13][14][15]. In addition, cold sprayed WC-Co coatings also had excellent tribological performance.…”

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confidence: 85%

“…A soft Al alloy substrate resulted in better interlocking than a hard SS substrate, thereby the corresponding particle bonding ratio was also much higher.decades. Existing studies have demonstrated that decarburization and phase transformation can be effectively avoided in cold sprayed WC-Co coatings due to the low working temperature [6][7][8][9][10][11][12][13][14][15][16][17][18][19]. This is a unique advantage that other thermal spray processes cannot achieve.…”

mentioning

confidence: 99%

“…In addition, cold sprayed WC-Co coatings also had excellent tribological performance. Compared with HVOF-sprayed WC-Co coatings, cold sprayed coatings had lower wear rate under both ball-on-disk sliding and dry abrasion tests [10,12,13,16].Single particle deposition experiment is of great importance to well understand the deposition and bonding features of a cold sprayed particle with a substrate [20]. In the case of cold sprayed WC-Co, single particle deposition was also conducted in some previous works [6,[21][22][23][24].…”

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Numerical and Experimental Investigation on Bonding Behavior of Cold Sprayed Porous WC-17Co Particles onto Different Substrates

Suo

Yin

et al. 2018

Coatings

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Cold sprayed WC-Co metal matrix composite coatings have shown great potential in wear-resistance applications. This work aims to use experimental and numerical methods to clarify the deposition and particle-substrate bonding behavior of a single porous WC-17Co particle onto various substrates. To achieve this objective, porous WC-17Co particles were used as the feedstock; soft Al 2024 (Al alloy) and hard stainless steel 316 (SS) were used as the substrates. The experimental results revealed that brittle WC-Co particles tended to remain intact after depositing on a soft Al alloy substrate, but underwent serious fracture when impacting on a hard SS substrate. Further results indicated that the high energy dissipation and the consequent high stress concentration in the WC-Co particle was the main reason for inducing the particle fracture. In addition, two different mechanical interlocking mechanisms were identified during the WC-Co particle deposition process (namely WC reinforcement interlock and WC-Co particle interlock), dominating the particle-substrate bonding. A soft Al alloy substrate resulted in better interlocking than a hard SS substrate, thereby the corresponding particle bonding ratio was also much higher.decades. Existing studies have demonstrated that decarburization and phase transformation can be effectively avoided in cold sprayed WC-Co coatings due to the low working temperature [6][7][8][9][10][11][12][13][14][15][16][17][18][19]. This is a unique advantage that other thermal spray processes cannot achieve. Moreover, cold sprayed WC-Co coatings were also reported to possess high hardness (ranging from 800 to 2000 HV). Such high coating hardness is comparable to or even higher than that of thermal sprayed coatings [8,10,[12][13][14][15]. In addition, cold sprayed WC-Co coatings also had excellent tribological performance. Compared with HVOF-sprayed WC-Co coatings, cold sprayed coatings had lower wear rate under both ball-on-disk sliding and dry abrasion tests [10,12,13,16].Single particle deposition experiment is of great importance to well understand the deposition and bonding features of a cold sprayed particle with a substrate [20]. In the case of cold sprayed WC-Co, single particle deposition was also conducted in some previous works [6,[21][22][23][24]. It was reported that powder structure significantly affected the particle deposition behavior. High-porosity WC-Co particle was more likely to fracture during impact with the substrate due to poor cohesion strength [21,25]. As most parts of such fractured particles will rebound, the coating deposition efficiency of high-porosity WC-Co powders was relatively low. On the other hand, substrate hardness was also found to pose some impacts on the particle deposition behavior [6,21]. WC-Co particles were more difficult to deposit on hard substrates than on soft substrates [19]. Although existing studies have revealed some important phenomena involved in the single WC-Co particle deposition process, there are still many other issues to be clarified, s...

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Numerical and Experimental Investigation on Bonding Behavior of Cold Sprayed Porous WC-17Co Particles onto Different Substrates

Suo

Yin

et al. 2018

Coatings

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“…tungsten carbides (WCs) are produced by the agglomeration and sintering process 1,10, [35][36][37] . Sintering occurs from a solid-state reaction between calcium tungstate (CaWO 4 ) and calcium carbides (CaC 2 ) at temperatures close to their respective melting points.…”

Section: Agglomeration and Sinteringmentioning

confidence: 99%

“…WC-Co-based coatings have large application as protective coatings against mechanical wear and corrosion 11,35,36,130,131 . The hardness of the WC particles confers wear resistance while the metal matrix offers toughness.…”

Section: Applications Of Cgs Technologymentioning

confidence: 99%

Cold gas spray coatings: basic principles corrosion protection and applications

et al. 2017

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ABSTRACT:In this review, the beginnings and evolution of the cold gas spray (CGS) technique are described, followed by the main fundamental aspects of the technique together with a description of the several spraying systems up to date. Sequentially, the main spray parameters and their influence on the properties of the coatings are reported. Afterwards, the most important methodologies for preparing the feedstock powders to be sprayed, the effect of the powder composition, microstructure, particle size and shape on the properties of the coatings are discussed. The nature of the spray gun and nozzle, and the substrate pre-treatments were also discussed. With regard to microstructure and properties, the chemical and physical characterization of the coatings and the performance in protecting the substrates against corrosion together with some mechanical properties are presented and compared. The lacking systematic studies about the great part of investigated systems is the main drawback to compare the published results. Closing this review, the main applications, and the potentialities of the CGS coatings are evidenced.

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