Fabrication and evaluation of atmospheric plasma spraying WC–Co–Cu–MoS2 composite coatings

Yuan, Jian-Hui; Zhu, Yin; Zheng, Xuebing; Ji, Heng; Yang, Tao

doi:10.1016/j.jallcom.2010.11.093

Cited by 55 publications

(8 citation statements)

References 21 publications

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“…For example, Hager Jr. et al have investigated that nickel graphite composite coatings are able to effectively mitigate fretting damage on titanium alloy compressor blades (Ref 3). Conventional manufacture of such materials includes powder metallurgy, hot pressing, sintering, and thermal spray ( Ref 1,[3][4][5][6][7][8]. However, those methods inevitably cause high-temperature-induced decomposition of solid lubricants and/or other phase transformations that could be detrimental for tribological performance (Ref 1, 5, 2 9).…”

Section: Introductionmentioning

confidence: 99%

Cold-Sprayed Cu-MoS2 and Its Fretting Wear Behavior

Zhang

Descartes

et al. 2015

J Therm Spray Tech

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Cu and Cu-MoS2 coatings were fabricated by cold spray and the fretting wear performance of the two coatings was compared. A mixture (95 wt.% Cu + 5 wt.% MoS2) was used as feedstock for the composite coating. Coatings were sprayed with identical gas flow conditions on the substrates preheated to approximately 170C. The morphology of coating top surface and polished cross sections was analyzed by scanning electron microscopy (SEM) and light optical microscopy (LOM). The influence of MoS2 on Cu deposition was examined. The local MoS2 concentration within the coating was found to affect the hardness. Fretting tests were carried out at two different normal loads and the influence of MoS2 on friction and wear was studied. The morphology and elemental composition of the wear scars and wear debris were observed by SEM and energy dispersive X-ray spectroscopy (EDS), respectively.

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Section: Introductionmentioning

confidence: 99%

Cold-Sprayed Cu-MoS2 and Its Fretting Wear Behavior

Zhang

Descartes

et al. 2015

J Therm Spray Tech

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“…According to SEM images, some dark regions on the worn surface of the coating can be observed. EDS analysis (table 5) verified that these tribofilms (A 1 ) possess a relatively dense structure [20]. The wear mechanisms in the as-sprayed and sealed coatings were abrasive and adhesive wear.…”

Section: Wear Measurementsmentioning

confidence: 84%

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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“…The incorporation of lubricants within coatings, and within thermal spray coatings in particular, has long been the subject of active research [15][16][17][18][19], leading to cutting-edge solutions such as the embedment of polymeric capsules containing a liquid lubricant inside flame-sprayed ceramic and metal coatings [20][21][22]. Specifically, the use of a liquid feedstock to deliver a solid lubricant during plasma spray deposition of wear-resistant coatings has first been proposed in the early work by Cipri et al [9].…”

Section: Introductionmentioning

confidence: 99%