Structure Property Relationship of Suspension Thermally Sprayed WC-Co Nanocomposite Coatings

Ahmed, Rehan; Faisal, Nadimul Haque; Alanazi, Nayef M.; Al-Mutairi, Saleh Haif; Toma, Filofteia-Laura; Berger, Lutz‐Michael; Potthoff, Annegret; Polychroniadis, E.K.; Sall, M.; Chaliampalias, D.; Goosen, Mattheus F. A.

doi:10.1007/s11666-014-0174-2

Cited by 39 publications

(30 citation statements)

References 37 publications

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“…Coatings were prepared with earlier optimized parameter sets by S-HVOF spraying using two types of fine WC-12 wt%Co powders (Powder 1 (P1) Dong Yang (HK) Int'l Group Limited) [22] and Powder 2 (P2) Fujimi Corp., Japan -DTS W653-20/5 [23] to produce the aqueous suspensions with 25 wt% solid content. The carbon and oxygen content of both powders are given in Table 1.…”

Section: Coating Deposition and Post-treatmentmentioning

confidence: 99%

“…During spraying of WC-Co suspensions by HVOF, a high carbon loss was observed [22,23]. With the HIPing treatment, the coating is expected to be transformed from the strongly non-equilibrium as-sprayed state into a state shifted toward equilibrium.…”

Section: Coating Deposition and Post-treatmentmentioning

confidence: 99%

“…However, thermal spraying of these nanocomposite hardmetal coatings, especially WC-Co, is technologically challenging. By this reason, so far only few studies on this topic are published in the literature [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

“…When a nanostructured agglomerated and sintered powder in an ethanol/ethylene glycol suspension was used, the crystallinity of the coating and the hardness (about 780 HV0.3) increased. In our previous studies, nanostructured suspension sprayed WC-Co HVOF coatings were successfully produced from aqueous suspensions of nanocomposite particles [22,23]. Moreover, despite a high carbon loss during spraying, these S-HVOF coatings had hardness values comparable to those of conventional HVOF WC-Co coatings.…”

Section: Introductionmentioning

confidence: 99%

“…The emphasis in the current paper is to consider the influence of a post-treatment of suspension sprayed S-HVOF WC-12Co coatings via hot isostatic pressing (HIPing) on the tribomechanical performance against the previously reported as-sprayed S-HVOF coatings [22,23]. In order to support the interpretation of the changes, the influence of carbon loss on the expected equilibrium phases was evaluated by thermodynamic calculations.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Post-treatment on the Microstructural and Tribomechanical Properties of Suspension Thermally Sprayed WC–12 wt%Co Nanocomposite Coatings

et al. 2017

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The potential to improve the tribomechanical performance of HVOF-sprayed WC-12Co coatings was studied by using aqueous WC-12Co suspensions as feedstock. Both as-sprayed and hot-isostatic-pressed (HIPed) coatings were studied. Mathematical models of wear rate based on the structure property relationships, even for the conventionally sprayed WC-Co hardmetal coatings, are at best based on the semiempirical approach. This paper aims to develop these semiempirical mathematical models for suspension sprayed nanocomposite coatings in as-sprayed and heat-treated (HIPed) conditions. Microstructural evaluations included transmission electron microscopy, X-ray diffraction and scanning electron microscopy equipped with energy-dispersive X-ray spectroscopy. The nanohardness and modulus of the coated specimens were investigated using a diamond Berkovich nanoindenter. Sliding wear tests were conducted using a ball-on-flat test rig. Results indicated that the HIPing post-treatment resulted in crystallization of amorphous coating phases and increase in elastic modulus and hardness. Influence of these changes in the wear mechanisms and wear rate is discussed. Results are also compared with conventionally sprayed high-velocity oxy-fuel hardmetal WC-Co coatings.

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Section: Coating Deposition and Post-treatmentmentioning

confidence: 99%

Section: Coating Deposition and Post-treatmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Influence of Post-treatment on the Microstructural and Tribomechanical Properties of Suspension Thermally Sprayed WC–12 wt%Co Nanocomposite Coatings

et al. 2017

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Microstructural Evaluation of Suspension Thermally Sprayed WC-Co Nanocomposite Coatings

Ahmed

Faisal

Ali

et al. 2015

Springer Proceedings in Physics

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Neutron Diffraction Residual Strain Measurements of Molybdenum Carbide-Based Solid Oxide Fuel Cell Anode Layers with Metal Oxides on Hastelloy X

et al. 2017

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Thermal spray deposition processes impart residual stress in layered Solid Oxide Fuel Cells (SOFC) materials and hence influence the durability and efficiency of the cell. The current study which is the first of its kind in published literature, reports results on using a neutron diffraction technique, to non-destructively evaluate the through thickness strain measurement in plasma sprayed (as-sprayed) anode layer coatings on a Hastelloy®X substrate. Through thickness neutron diffraction residual strain measurements were done on three different anode coatings (Mo-Mo 2 C/Al 2 O 3 , Mo-Mo 2 C/ ZrO 2 and Mo-Mo 2 C/TiO 2 ) using the vertical scan mode. The three anode coatings (developed through optimised process parameters) investigated had porosities as high as 20%, with thicknesses between 200 μm to 300 μm deposited on 4.76 mm thick Hastelloy®X substrate discs of 20 mm diameter. The results showed that while the through thickness residual strain in all three anodes was dissimilar for the investigated crystallographic planes, on average it was tensile. Other measurements include X-ray diffraction, nanoindentation and SEM microscopy. As the anode layer microstructures are complex (includes bi-layer alternate phases), nondestructive characterisation of residual strain, e.g. using neutron diffraction, provides a useful measure of through thickness strain profile without altering the stress field in the SOFC electrode assembly.

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Structure Property Relationship of Suspension Thermally Sprayed WC-Co Nanocomposite Coatings

Cited by 39 publications

References 37 publications

Influence of Post-treatment on the Microstructural and Tribomechanical Properties of Suspension Thermally Sprayed WC–12 wt%Co Nanocomposite Coatings

Influence of Post-treatment on the Microstructural and Tribomechanical Properties of Suspension Thermally Sprayed WC–12 wt%Co Nanocomposite Coatings

Microstructural Evaluation of Suspension Thermally Sprayed WC-Co Nanocomposite Coatings

Neutron Diffraction Residual Strain Measurements of Molybdenum Carbide-Based Solid Oxide Fuel Cell Anode Layers with Metal Oxides on Hastelloy X

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