Wear and erosion behavior of plasma-sprayed WC-Co coatings

Kim, H. J.; Kweon, Young-Gak; Chang, R.W.

doi:10.1007/bf02648274

Cited by 62 publications

(17 citation statements)

References 19 publications

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“…The applied load was fixed at 10 N and the sliding distance at 2500 m. Both experimental and predicted results are in well agreement in the case of lower sliding velocities (less than 0.8 m s À 1 ) showing no significant influence on the friction coefficient. This behaviour is observed in various studies [26,27]. However, in the case of the predicted results, a relative increase of the friction coefficient is recorded for high-sliding velocities.…”

Section: Resultssupporting

confidence: 37%

Friction and wear behaviour prediction of HVOF coatings and electroplated hard chromium using neural computation

et al. 2004

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Section: Resultssupporting

confidence: 37%

Friction and wear behaviour prediction of HVOF coatings and electroplated hard chromium using neural computation

et al. 2004

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“…This debris, with grain sizes ranging from about 200 nm to 15 lm, stems from ball wear and WC grain pull-out and fragmentation. This mode of abrasive wear is different from the one observed in conventional abrasion tests ( Ref 7,21,23,24) where larger abrasive particles produce more severe wear (higher wear rates and different wear tracks). Qiao et al found that abrasive wear is about 50,000 times higher than sliding wear (Ref 21).…”

Section: Wear and Tribological Behaviormentioning

confidence: 79%

Microstructure and Wear Behavior of Conventional and Nanostructured Plasma-Sprayed WC-Co Coatings

et al. 2010

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WC-12%Co coatings were deposited by atmospheric plasma spraying using conventional and nanostructured powders and two secondary plasmogenous gases (He and H 2 ). Coating microstructure and phase composition were characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), and x-ray diffraction techniques (XRD) techniques. This study examined wear and friction properties of the coatings under dry friction conditions. SEM was used to analyze abraded surface microstructure. Coating microhardness and fracture toughness were also determined. All coatings displayed strong decarburization as a result of WC decomposition, which gave rise to the formation of secondary phases (W 2 C and W). A very fine undissolved WC crystalline dispersion coexisted with these new phases. TEM observation confirmed that the matrix was predominantly amorphous and filled with block-type, frequently dislocated crystallites. Wear was observed to follow a three-body abrasive mechanism, since debris between the ball and the coating surface was detected. The main wear mechanism was based on subsurface cracking, owing to the arising debris. WC grain decomposition and dissolution were concluded to be critical factors in wear resistance. The level of decomposition and dissolution could be modified by changing the plasmogenous gas or feed powder grain size. The influence of the plasmogenous gas on wear resistance was greater than the influence of feedstock particle size.

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“…The amount of boron fell to 1.6 wt.% from 5.9 wt.% (Table 3) as a result of the spraying. This loss can be explained by a similar phenomenon such as decarburization, during spraying [15,16]. The coating structure consists more: or less of bulk materials and contains fewer pores.…”

Section: Characteristics Of the Feedstock Powdersmentioning

confidence: 95%

Characterization of Fe-Cr-B based coatings produced by HVOF and PTA processes

Grossi

Kweon

1999

Metals and Materials

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Two Fe-Cr-B based gas atomized powders, Armacor M and 16, were thermally sprayed on a low carbon steel substrate, using the HVOF (High Velocity Oxygen Fuel) process. Armacor M was also weld-surfaced with the PTA (Plasma Transferred Arc) process. The resultant deposits were subsequently characterized, using X-ray diffraction, scanning electron microscopy, and microhardness measurement. The effects of heat treatment were also studied for HVOF-sprayed coatings. The wear performance of the coatings was investigated by two-body abrasive wear tests. The results of microstructural analysis of as-sprayed deposits revealed oxide and boride phases such as Fe304 and Crl.65Feo.35Bc~.~, in an ~ matrix for the HVOF-sprayed Armacor 16 coating, and only the boride phases (Cr1.65F%35B0.~6 and Cr~B) in an tx matrix for the HVOFsprayed Armacor M coating. PTA weld-surfaced Armacor M coating contains needle-type long precipitates of Cr~B and Crl.65Fe0.3~B~).9~, in the a matrix. The hardness of the HVOF-sprayed Armacor 16 coating after heat treatment was substantially less than that of the as-sprayed coating due to the phase transformation from tx to y phase. Heat treatments of the HVOF-sprayed Armacor M coating did not produce changes in phase and its hardness decreased as compared to that of the as-sprayed coating. While HVOF-sprayed and PTA weld-surfaced Armacor M coatings have the same hardness, the latter shows better abrasive wear resistance because of the size and orientation of its boride phases. The broadening of the XRD patterns and the increase in hardness after wear testing suggest that the transformation from the crystalline to the amorphous structure occurred on the uppermost layer during wear testing.

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Wear and erosion behavior of plasma-sprayed WC-Co coatings

Cited by 62 publications

References 19 publications

Friction and wear behaviour prediction of HVOF coatings and electroplated hard chromium using neural computation

Friction and wear behaviour prediction of HVOF coatings and electroplated hard chromium using neural computation

Microstructure and Wear Behavior of Conventional and Nanostructured Plasma-Sprayed WC-Co Coatings

Characterization of Fe-Cr-B based coatings produced by HVOF and PTA processes

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