Influence of Parameter Variations on WC-Co Splat Formation in an HVOF Process Using a New Beam-Shutter Device

Tillmann, Wolfgang; Hussong, Birger; Priggemeier, T.; Kuhnt, Sonja; Rudak, Nikolaus; Weinert, H.

doi:10.1007/s11666-012-9881-8

Cited by 13 publications

(5 citation statements)

References 17 publications

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“…Therefore, the deposition of particles containing larger carbides results in void spaces where the particles have failed to amalgamate with surrounding particles. A confirming trend has been observed in corresponding studies [36][37][38], with authors attributing the increased flattening of particles following impact to the presence of smaller carbides within the feedstock powder [36]. It should be noted that further optimisation of the spray parameters could reduce the level of porosity within each respective coating.…”

Section: Surface Topographysupporting

confidence: 82%

“…The high particle temperature is sufficient to cause flattening [43] of the alumina particles. However, due to the oxide particles being larger than the carbides retained in the cermet powders [36][37][38], the porosity of the Al2O3 coating is greater than that of WC-CoCr and Cr3C2-NiCr. Results of SEM analysis present consistent chemical composition throughout the coating.…”

Section: Surface Topographymentioning

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: Surface Topographysupporting

confidence: 82%

Section: Surface Topographymentioning

confidence: 99%

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 porosity of WC-12Co coating calculated using the metallographic method was 1.62%, while the porosity of nanostructured WC-Co/Al coating was only 0.57%. Tillmann et al [23] reported that the porosity of coatings decreased with the improvement of the single particles flattening. The phenomena observed in Figures 5 and 6 are in agreement with the conclusion from Tillmann et al…”

Section: Deposition Behavior Of the Powdersmentioning

confidence: 99%

Synthesis and Characterization of Nanostructured WC-Co/Al Powder Prepared by Mechanical Alloying

Zhang

Yin

et al. 2016

Journal of Nanomaterials

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Nanostructured WC-Co/Al powder was synthesized from WC-12Co powder and pure Al powder by mechanical alloying (MA). The morphology and microstructural evolution of WC-Co/Al powder were investigated by a series of characterization methods. The results showed that theβ-Co phase in the initial WC-12Co powder was replaced by the AlxCo phases (such as Al9Co2and Al13Co4). As the ball milling time increased, the average grain size of WC in the WC-Co/Al powder decreased firstly and then remained at a constant value of around 40 nm. The deposition behavior of powders sprayed by high velocity oxygen fuel (HVOF) spraying was investigated. During spraying, the WC-Co/Al powder had a better flattening than the WC-12Co powder without ball milling, which is beneficial to fabricate compact coatings with lower porosity.

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“…The porosity values of the WC-10Ni, Ni45, and NiCr coatings sprayed with the same parameters are 0.78%, 1.03%, and 0.63%, respectively, and the corresponding surface roughness values, R z , are 23.4 µm, 43.2 µm, and 52.7 µm. The porosity of the coatings is determined by the spraying process and parameters, powder material, and particle size [27]. Table 3 shows the melting point of raw materials.…”

Section: Coating Microstructurementioning

confidence: 99%

Study of the Tribological Properties of HVOF-Sprayed Ni-Based Coatings on Ti6Al4V Titanium Alloys

Liu

et al. 2022

Coatings

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In aviation, the relative sliding between titanium alloy components causes varying degrees of wear. This work aimed at reducing abrasion between titanium alloy parts and improving their service life. Three different Ni-based coatings, WC-10Ni, Ni45, and NiCr coatings, are sprayed on the surface of Ti6Al4V alloy by HVOF. Test results of the mechanical and tribological properties of such coatings show that the hardness of the Ni45 and NiCr coatings are 673 HV0.1 and 438 HV0.1, respectively, which are lower than that of the WC-10Ni coating. When subjected to a high load, the Ni45 and NiCr coatings suffer a cracking of flat particle interfaces due to the low hardness, which lowers the fracture toughness more than that of the WC-10Ni coating. The specific wear rates of the coatings gradually decrease with the increase in the coating hardness and fracture toughness. However, the cutting of Ti6Al4V by the WC-10Ni coating and the adhesion of the NiCr coating to Ti6Al4V result in severe wear loss of the Ti6Al4V friction pair. The moderately hard Ni45 coating has a weaker cutting and adhesion effect on Ti6Al4V than the WC-10Ni and NiCr coatings, respectively, and the Ti6Al4V friction pair has the lowest wear loss. This study is a viable scheme for the design of wear-resistant coatings on titanium alloy surfaces and for improving the tribological properties between titanium alloy components.

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Influence of Parameter Variations on WC-Co Splat Formation in an HVOF Process Using a New Beam-Shutter Device

Cited by 13 publications

References 17 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

Synthesis and Characterization of Nanostructured WC-Co/Al Powder Prepared by Mechanical Alloying

Study of the Tribological Properties of HVOF-Sprayed Ni-Based Coatings on Ti6Al4V Titanium Alloys

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