Research Papers: Friction & Wear

Abrasive and Erosive Wear Performance of Rare Earth Oxide Doped Ni/WC Coatings

[+] Author and Article Information
Surajit Purkayastha

e-mail: sp640@cam.ac.uk

D. K. Dwivedi

Mechanical and Industrial
Engineering Department,
Indian Institute of Technology Roorkee,
Roorkee, Uttrakhand 247667, India

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received January 4, 2013; final manuscript received June 29, 2013; published online October 3, 2013. Assoc. Editor: Robert Wood.

J. Tribol 136(1), 011602 (Oct 03, 2013) (9 pages) Paper No: TRIB-13-1011; doi: 10.1115/1.4025099 History: Received January 04, 2013; Revised June 29, 2013

The effect of CeO2 modification on flame sprayed nickel-tungsten carbide (WC) coatings was investigated. The modified coatings exhibited smaller grain sizes of the ceramic phase due to enhanced dissolution of the WC phase. The rare earth doped coatings, especially Ni-WC +0.9% wt. CeO2, showed superior abrasive wear resistance with respect to the unmodified coating mainly due to enhanced hardness. Coating modified with 0.6% wt. CeO2 demonstrated superior erosion resistance at both impact angles, 30 deg and 90 deg, respectively, primarily due to low porosity levels. Microstructural examination showed different wear mechanisms in conventional and doped coatings.

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Fig. 1

SEM of alumina erodent used in air jet erosion

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Fig. 2

SEM micrographs of Ni-WC feedstock powder

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Fig. 3

Optical micrograph of coating-substrate interface in conventional Ni/WC

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Fig. 4

XRD analysis of Ni/WC +0.9% CeO2 doped coating

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Fig. 5

SEM micrograph of Ni/WC +0.9% CeO2 and EDS analysis of regions marked A and B

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Fig. 6

Perimeter of WC grains in coatings

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Fig. 7

Influence of CeO2 addition (wt. %) on porosity

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Fig. 8

SEM image of coating doped with (a) 0.6% and (b) 1.5% wt. CeO2

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Fig. 9

Hardness of coating as function of CeO2 addition (wt. %)

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Fig. 10

Abrasive wear rate of coating as function of CeO2 addition (wt. %)

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Fig. 11

SEM images showing wear surface morphologies of (a) unmodified coating, (b) 0.6 wt. % CeO2 modified coating, (c) 0.9 wt. % CeO2 modified coating, and (d) 1.5 wt. % CeO2 modified coating

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Fig. 12

Mass loss of Ni/WC coatings (as a function of CeO2 addition) at various impact angles

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Fig. 13

3D optical profile from the center of eroded coatings that shows depth profiles (scanned area: 592 × 451μm). (a) Unmodified Ni/WC coating eroded at 30 deg impact angle, (b) Ni/WC +0.6% CeO2 eroded at 30 deg impact angle, (c) unmodified Ni/WC coating eroded at 90 deg impact angle, and (d) Ni/WC +0.6% CeO2 eroded at 90 deg impact angle.

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Fig. 14

Morphology of the eroded surfaces of (a) Ni/WC (b) Ni/WC +0.6% CeO2, and (c) Ni/WC +1.5% CeO2 coating at 90 deg impact angle

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Fig. 15

Morphology of the eroded surfaces of (a) Ni/WC (b) Ni/WC +0.6% CeO2, and (c) Ni/WC +1.2% CeO2 and (d) Ni/WC +1.5% CeO2 coating at 30 deg impact angle




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