Improvement in tribological properties of atmospheric plasma-sprayed WC–Co coating followed by Cu electrochemical impregnation

Yuan, Jian-Hui; Zhu, Yin; Zheng, Xuebing; Ruan, Qichao

doi:10.1016/j.apsusc.2009.04.181

Cited by 24 publications

(7 citation statements)

References 14 publications

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“…12, it is seen that COF rises to a maximum value in the first 170-200 m. In most cases, this initial peak lies between 0.5 and 0.6. The initial rise of the COF in the dry sliding of cermet coatings has been widely observed in the literature, and it is attributed to the initial running-in stage of contact where the limited real contact area between the sliding interfaces is intensely deformed and worn away, until it is increased and equilibrium is achieved (Ref 35,40,43,48). In this running-in phase, significant cracking and material removal occurs, which is recorded as high COF (Ref 48).…”

Section: Effect Of Tribofilm On Friction Coefficientmentioning

confidence: 98%

“…(b) Alternatively, in weaker coatings, subsurface cracks will initiate a few lm below the sliding surface (Fig. 9e), where the maximum shear stresses are developed (Ref 29,43), and propagate via the splat boundaries, porosity, brittle/saturated Co-rich binder or W 2 C, which would be the preferential paths for crack propagation ( Ref 30,44,45), until they reach the surface or meet neighboring cracks. At this point, spallation will occur accompanied with a large-scale loss of coating volume.…”

Section: Mechanisms Of Wearmentioning

confidence: 99%

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Effects and Interplays of Spray Angle and Stand-off Distance on the Sliding Wear Behavior of HVOF WC-17Co Coatings

et al. 2019

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The state of particle impact (velocity and temperature) significantly affects the coating's microstructural, mechanical properties and wear performance. The spray stand-off distance and spray angle dictate particle velocity components and temperature at impact. This work aims in advancing the understanding of their effect and interplay in regard to the sliding wear performance as well as the mechanisms of wear themselves of HVOF-sprayed WC-17Co coatings. Dry sliding wear resistance was evaluated by a pin-on-disk test, and significant interplay between the spray parameters was observed. A large number of experiments in a full-factorial manner provided insights into the progressive tribofilm build-up and wear damage modes and allowed for proposing mechanisms regarding their occurrence. Small deviations from the normal spray angle at long stand-off distances proved to be beneficial for the wear performance of the coatings. The highest friction coefficient and most aggressive wear damage were observed in coatings with a rich coverage of the wear track with a tribofilm. The phase composition of the coatings proved to be the principal contributor in the wear performance.

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Section: Effect Of Tribofilm On Friction Coefficientmentioning

confidence: 98%

Section: Mechanisms Of Wearmentioning

confidence: 99%

Effects and Interplays of Spray Angle and Stand-off Distance on the Sliding Wear Behavior of HVOF WC-17Co Coatings

et al. 2019

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“…Atmospheric plasma spraying (APS) has been widely used to make coatings on metal substrates to improve their wear and corrosion resistance 1‐6 . Among various coatings, WC‐Co coatings are increasingly attractive because of their extreme high hardness, excellent wear resistance, and good toughness 7‐10 . Traditionally, the WC‐Co powders used for spraying process were prepared by granulating the ball‐milled powders 3,7‐10 .…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5][6] Among various coatings, WC-Co coatings are increasingly attractive because of their extreme high hardness, excellent wear resistance, and good toughness. [7][8][9][10] Traditionally, the WC-Co powders used for spraying process were prepared by granulating the ball-milled powders. 3,[7][8][9][10] Because it is hard to uniformly disperse WC and Co particles during ball milling, their aggregation continued existing in the subsequently granulated powders.…”

Section: Introductionmentioning

confidence: 99%

“…[7][8][9][10] Traditionally, the WC-Co powders used for spraying process were prepared by granulating the ball-milled powders. 3,[7][8][9][10] Because it is hard to uniformly disperse WC and Co particles during ball milling, their aggregation continued existing in the subsequently granulated powders. 11 This led to the poor uniformity of WC and big pores in the sprayed coatings and further decreased the hardness and wear resistance of the coating.…”

Section: Introductionmentioning

confidence: 99%

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Utilizing the autocatalysis of Co to prepare low‐cost WC‐Co powder for high‐performance atmospheric plasma spraying

Zhang

Yue

et al. 2020

J Am Ceram Soc

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A novel method of incorporating fluidized bed chemical vapor deposition (FBCVD) with electroless plating was developed to effectively prepare the core-shell structured WC-Co composite powders. The Co nanoparticles decorated on the surface of WC particles by FBCVD acted as active catalysts for the subsequent electroless plating process. The particle size and quantity of the decorated Co particles determined the electroless plating rate but the particle size played more important role. For the conditions tested, the maximum electroless plating rate of 2.34 mg/g/min was obtained by using an optimal FBCVD pretreatment at 750°C for 3 minutes. WC-12Co composite powders with a commercial composition widely used for atmospheric plasma spraying (APS) were efficiently prepared. The composite powders exhibited excellent suitability for APS by forming a homogenous CoW -C ternary liquid stream. The APS coating is not only well-bonded with the substrate but also consisted of hard nonequilibrium Co 3 W 3 C and W 2 C phases with a uniform distribution. Both remarkably improved the hardness and tribological properties of the APS coating.

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Sliding wear and friction behaviour of WC‐stainless steel and WC–Co composites

Vilhena

Fernandes

Sacramento

et al. 2022

Lubrication Science

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The sliding wear and friction behaviour of new developed WC-stainless steel composites without and with carbon addition were evaluated using a linearly reciprocating sliding tribometer under ball-on-flat configuration, sliding against an alumina ball under unlubricated conditions. The wear of both, discs and ball were measured for different applied loads, sliding distances and frequencies. Worn surfaces were investigated by using microscopy and topography techniques. Comparative experiments were performed using flat samples of a conventional WC-Co composite. It was found that the WC-Co grade displayed an undoubtedly better sliding wear resistance and lower coefficient of friction if compared with the newly produced WC-SS composites.

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Improvement in tribological properties of atmospheric plasma-sprayed WC–Co coating followed by Cu electrochemical impregnation

Cited by 24 publications

References 14 publications

Effects and Interplays of Spray Angle and Stand-off Distance on the Sliding Wear Behavior of HVOF WC-17Co Coatings

Effects and Interplays of Spray Angle and Stand-off Distance on the Sliding Wear Behavior of HVOF WC-17Co Coatings

Utilizing the autocatalysis of Co to prepare low‐cost WC‐Co powder for high‐performance atmospheric plasma spraying

Sliding wear and friction behaviour of WC‐stainless steel and WC–Co composites

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