A comparative study on slurry and dry erosion behaviour of HVOF sprayed WC–CoCr coatings

Thakur, Lalit; Arora, Navneet

doi:10.1016/j.wear.2013.03.028

Cited by 80 publications

(40 citation statements)

References 24 publications

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“…Despite both investigations [14,15] seeking to evaluate the erosion performance of hard cermet coatings, there is little published research contrasting the two test regimes, slurry and dry erosion, on analogous surfaces. One such investigation by Thakur and Arora [19] examined the erosion of WC coatings under pot-type slurry impingement and dry jet erosion. The investigation [19] concluded that cermet coatings were highly erosion resistant when compared with the uncoated substrate and that dry jet erosion brought about substantially greater erosion rates over slurry erosion.…”

Section: K Ke Ey Yw Wo or Rd Ds Smentioning

confidence: 99%

“…One such investigation by Thakur and Arora [19] examined the erosion of WC coatings under pot-type slurry impingement and dry jet erosion. The investigation [19] concluded that cermet coatings were highly erosion resistant when compared with the uncoated substrate and that dry jet erosion brought about substantially greater erosion rates over slurry erosion. This was attributed to all impinging particles striking the specimen at 90 O , and to increased particle velocity as compared with pot-type slurry erosion.…”

Section: K Ke Ey Yw Wo or Rd Ds Smentioning

confidence: 99%

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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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Section: K Ke Ey Yw Wo or Rd Ds Smentioning

confidence: 99%

Section: K Ke Ey Yw Wo or Rd Ds Smentioning

confidence: 99%

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

Peat

Galloway

Toumpis

et al. 2016

Surface and Coatings Technology

View full text Add to dashboard Cite

show abstract

“…3a and 4a. However, for a given increase in speed, increase in wear rate was found to be less and it may be due to the fact that at higher speeds erodent particle motion was highly random and led to severe inter-particle collisions which caused decrease in the momentum of erodent particles leading to decrease in mass loss at higher speeds [19][20][21][22]. For the same 180 min test run, mass loss is more for 45 wt.% concentration as compared to 25 wt.% concentration.…”

Section: Slurry Erosion Behaviourmentioning

confidence: 99%

Erosion wear evaluation of HVOF sprayed WC-12Co coating on some pipeline materials using Taguchi approach

Singh¹,

Bansal²,

Goyal³

2020

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Pipeline materials used for the transportation of bottom ash slurry generally suffer from intense wear due to slurry erosion. In this work, High-Velocity Oxy-Fuel (HVOF) spray process was used for the deposition of WC-12Co coating on the Mild steel, SS 304 and SS 202. Slurry erosion pot tester was used for erosion tests of uncoated and coated materials. Effects of three factors namely slurry concentration, the speed of impacting particles and erosion test duration on erosion rate were investigated using the Taguchi approach. Influence of speed of impacting particles on the erosion rate of uncoated and all the coated materials was found to be maximum, which was followed by erosion test duration and then slurry concentration. WC-12Co coating showed significant improvement in erosion wear resistance of three substrate materials namely mild steel, SS 304 and SS 202. WC-12Co coating showed the brittle mechanism of erosion wear. After the Taguchi analysis slurry erosion results were further validated with analysis of variance (ANOVA). From both ANOVA and Taguchi analysis, it was observed that the influence of speed is maximum on the erosion wear of all the uncoated as well as WC-12Co coated specimens, followed by time and slurry concentration. K e y w o r d s : bottom ash, slurry erosion, pipeline steel, HVOF spray

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“…Finally, there have been numerous studies examining the effect of carbide size on the wear performance of HVOF deposited coatings [12,26,32,33], the outcomes of which demonstrate the increase in wear rate with increasing carbide size. The presence of larger carbides causes increased damage to the underlying surfaces with WC-CoCr experiencing low wear due to the coatings comparably small carbide size [12] and high hardness [34].…”

Section: I In Nt Tr Ro Od Du Uc Ct Ti Io On Nmentioning

confidence: 99%

Evaluation of the synergistic erosion-corrosion behaviour of HVOF thermal spray coatings

Peat

Galloway

Toumpis

et al. 2016

Surface and Coatings Technology

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A Ab bs st tr ra ac ct tThe present study examines three High Velocity Oxy Fuel deposited coatings, Tungsten Carbide, Chromium Carbide and Aluminium Oxide, under slurry erosion-corrosion conditions. Coatings produced in this manner typically exhibit superior density and hardness over alternative thermal spray technologies, therefore are suitable for use in corrosive and highly erosive environments. The scope of the study concentrates on isolation of the contributing factors of erosion, corrosion and synergy through applied electrochemistry, as well as metallographic analysis to evaluate the mechanisms causing coating degradation. Carbide with a Cobalt binder to be an effective protective coating, resulting in a significant reduction in total material loss over uncoated S355 steel.

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A comparative study on slurry and dry erosion behaviour of HVOF sprayed WC–CoCr coatings

Cited by 80 publications

References 24 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

Erosion wear evaluation of HVOF sprayed WC-12Co coating on some pipeline materials using Taguchi approach

Evaluation of the synergistic erosion-corrosion behaviour of HVOF thermal spray coatings

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