Interface bonding between particle and substrate during HVOF spraying

Sun, Ce; Guo, Liu; Lu, G. X.; Lv, Yanbing; Ye, Fuxing

doi:10.1016/j.apsusc.2014.08.196

Cited by 16 publications

(6 citation statements)

References 14 publications

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“…6b reveals small pores within the coating layer which tend to form along the interface between carbide and binder material[40]. As with WC-CoCr, the CrC and Ni-Cr binder have on the whole, mixed well following the HVOF deposition, however regions of concentrated Ni-Cr and CrC do exist within the coating matrix.…”

mentioning

confidence: 97%

Performance evaluation of HVOF deposited cermet coatings under dry and slurry erosion

Peat

Galloway

Toumpis

et al. 2016

Surface and Coatings Technology

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The present work reports on the examination of three High Velocity Oxy Fuel deposited coatings, Tungsten Carbide, Chromium Carbide and Aluminium Oxide, under slurry erosion and dry erosion conditions. The density and hardness of coatings produced in this manner are typically superior to other thermal spray processes, and are therefore suitable for use in corrosive and highly erosive environments. The primary aim of this investigation was to establish the total mass and volume loss from each coating under dry and slurry erosion testing conditions and compare the level of material loss following the respective testing regimes. The scope of the study incorporated the application of cathodic protection to prohibit the effects of corrosion in the case of slurry erosion testing. This approach ensured that any damage to the surface could be attributed to pure erosion, and as such, be assessed against the dry erosion test data. Subsequent examination of the resulting wear scars facilitated assessment of the level of damage caused by the impinging slurry. Results revealed variation in the level of degradation experienced by each coating type under the respective test conditions. Under both dry erosion and slurry erosion, Tungsten Carbide with a Cobalt binder proved an effective protective coating by exhibiting a reduction in material loss over other assessed coatings

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mentioning

confidence: 97%

Performance evaluation of HVOF deposited cermet coatings under dry and slurry erosion

Peat

Galloway

Toumpis

et al. 2016

Surface and Coatings Technology

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“…The higher the pressure values used, the higher the spraying velocity reached. In CGS, it is possible to work with pressures between 5-40 bar; nevertheless, a systematic study of this parameter must be performed for each system, since low pressure values may not be enough for the particles to reach the critical velocity and to form the splats (Figure 7a) 25 . On the other hand, too high pressures may cause the particle deflection or cavitation (Figure 7b) 26 depending on the feedstock powder and substrate material characteristics, leading to decrease the deposition efficiency.…”

Section: Gas Pressure and Temperaturementioning

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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“…1b). The test condition were as follows: the swing angle of ± 10°, the swing cycles of 2.5x10 4 , the applied load of 25 MPa, the swing frequency of 2, 2.5, and 3 Hz, which was established referred to the U.S. military standards SAE AS81819 and SAE AS81820. The scanning electron microscope (SEM) was used to observe microstructure and morphology of the coatings.…”

Section: Advances In Engineering Research Volume 110mentioning

confidence: 99%

“…Remarkable achievements have been made in many high technology fields [1][2][3]. Compared with thermal spraying [4][5], laser cladding [6], thin film deposition [7,8] and other technologies, the preparation process of adhesive solid lubricant coating is undoubtedly the most economical and feasible [9][10].Bonded solid lubrication coating is not only economical but also excellent in tribological properties. Currently, more than 95% of the lubricating materials achieve the lubrication performance through spraying technology to reduce the friction and wear [11].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Tribological Performance Testing of Bonded Solid Lubricating Coatings Used on Spherical Plain Bearings

Zhang¹,

Qiu²,

Li³

et al. 2017

Proceedings of the 3rd Annual International Conference on Advanced Material Engineering (AME 2017)

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Abstract.To solve the lubricating problems of spherical plain bearings under high-low temperature, high vacuum, heavy loads and strong oxidation conditions, the PTFE and MoS2 based lubricating coatings were prepared on the inner rings of the spherical plain bearings by spraying technique. A self-made tribo-tester was used to investigate the friction coefficient, wear loss, and friction temperature increase of bearings with coatings under different oscillation frequencies. Using scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDS), the worn surfaces of the coatings and the counter surfaces were characterized and analyzed. The results showed that PTFE and MoS2 based lubricating coatings significantly improved the tribological properties of the spherical plain bearings. The tribological performance of PTFE based coating was obviously superior to MoS2 based coating and its wear mechanism was adhesive wear. However, the MoS2 based coating mainly occurred severe adhesive wear and abrasive wear, and the tribological properties of spherical plain bearings with MoS2 coating were relatively optimal under low frequencies. This paper provides a reference to developing new lubricating techniques for the spherical plain bearings. IntroductionBonded solid lubrication coating is an effective solution to solve the lubrication and wear problems under harsh conditions of high-low temperature, high vacuum, heavy loads and strong oxidation conditions. Remarkable achievements have been made in many high technology fields [1-3]. Compared with thermal spraying [4][5], laser cladding [6], thin film deposition [7,8] and other technologies, the preparation process of adhesive solid lubricant coating is undoubtedly the most economical and feasible [9][10].Bonded solid lubrication coating is not only economical but also excellent in tribological properties. Currently, more than 95% of the lubricating materials achieve the lubrication performance through spraying technology to reduce the friction and wear [11]. Molybdenum disulfide (MoS2) has the six-party crystal structure formed by S-Mo-S covalent, which is similar to the "sandwich layer", and easily to slip and transfer into lubricant film on the contact surfaces [12] and its application in sliding contact surface can reduce the wear degree of the structure [13][14].However, pure MoS2 coatings in the wet air environment present is easy to be oxidized and leads to low hardness, resulting in poor wear resistance and limited application [15][16]. Polytetrafluoroethylene (PTFE) is widely used as a solid lubricant because of its excellent selflubricating property, low friction coefficient, thermal stability and chemical stability. But PTFE as wear-resistant materials can`t be used alone because of its low mechanical strength, poor wear resistance, and cold flow phenomenon [17][18][19]. The tribological performance of the organic solvent

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Interface bonding between particle and substrate during HVOF spraying

Cited by 16 publications

References 14 publications

Performance evaluation of HVOF deposited cermet coatings under dry and slurry erosion

Performance evaluation of HVOF deposited cermet coatings under dry and slurry erosion

Cold gas spray coatings: basic principles corrosion protection and applications

Preparation and Tribological Performance Testing of Bonded Solid Lubricating Coatings Used on Spherical Plain Bearings

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