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Research Papers: Friction and Wear

Tribological Influences of CuO Into 3Y-TZP Ceramic Composite in Conformal Contact

[+] Author and Article Information
Subhrojyoti Mazumder

Materials Processing and
Microsystems Laboratory,
CSIR-Central Mechanical Engineering
Research Institute,
Durgapur 713209, India

Om Prakash Kumar, Dinesh Kumar Kotnees

Department of Materials
Science and Engineering,
Indian Institute of Technology Patna,
Bihta 801106, Patna, India

Nilrudra Mandal

Materials Processing and
Microsystems Laboratory,
CSIR-Central Mechanical Engineering
Research Institute,
Durgapur 713209, India,
e-mail: n_mandal@cmeri.res.in

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received May 21, 2018; final manuscript received October 28, 2018; published online December 6, 2018. Assoc. Editor: Min Zou.

J. Tribol 141(3), 031606 (Dec 06, 2018) (10 pages) Paper No: TRIB-18-1197; doi: 10.1115/1.4041894 History: Received May 21, 2018; Revised October 28, 2018

The aim of the study was to investigate the friction and wear phenomena of 3 mol % yttria-stabilized tetragonal zirconia polycrystals (3Y-TZP) ceramics with the inclusion of copper oxide (CuO) in large area conformal contact geometry. The pin-on-disk tribometer was used to conduct the dry sliding test using CuO/3Y-TZP as pin and alumina as counter surface. The coefficient of friction (μ) for CuO-added 3Y-TZP was decreased by ∼38% compared to pure 3Y-TZP due to formation of protective tribo film to the substrate. In addition, the experiments also showed that the specific wear rate (k) was reduced by ∼54% with the inclusion of CuO in to 3Y-TZP matrix. The different phases of the zirconia, copper, and yttria as well as the phase transformation before and after sliding test were identified by X-ray diffraction (XRD) analysis. Field emission scanning electron microscopy (FESEM) and energy dispersive X-ray (EDS) analysis revealed the existence of CuO in the patchy layers in the worn-out surface of the tested CuO/3Y-TZP sample leading to lower coefficient of friction and improve the wear resistance against alumina counterface in conformal contact geometry. Severe wear mechanism was the dominating factor due to the local plastic deformation of the large number of asperities since the pair of contact was conformal.

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References

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Figures

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Fig. 1

(a) Pin-on-disk tribometer setup, (b) worn-out CuO/3Y-TZP sample, and (c) alumina disk

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Fig. 2

Field emission scanning electron microscopy micrographs of sintered surfaces of (a) 3Y-TZP and (b) CuO/3Y-TZP

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Fig. 3

Field emission scanning electron microscopy/EDS micrographs showing the elemental distribution of zirconia, copper, and yittria phase

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Fig. 4

X-ray diffraction pattern of the (a) 3Y-TZP and (b) CuO/3Y-TZP samples before and after sliding test showing the monoclinic (m), tetragonal (t), cubic (c) and CuO (Cu) peaks, and (c) enlarged view of the pattern between 2θ = 28 deg and 2θ = 32 deg

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Fig. 5

Coefficient of friction as a function of sliding distance of 3Y-TZP and CuO/3Y-TZP sliding against alumina disk at 19.6 N normal load and 0.4 m/s sliding velocity

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Fig. 6

Wear depth profile as a function of sliding distance of 3Y-TZP and CuO/3Y-TZP sliding against alumina disk at 19.6 N normal load and 0.4 m/s sliding velocity

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Fig. 7

Field emission scanning electron micrographs for worn surfaces after 1000 m sliding distance for (a) pure 3Y-TZP and (b) CuO/3Y-TZP samples

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Fig. 8

EDS elemental analysis of the worn-out surface of the sample CuO/3Y-TZP

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Fig. 9

Worn-out surface profiles of the tested samples 3Y-TZP (a), CuO/3Y-TZP (b) and their corresponding roughness parameters (c) and (d), respectively

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Fig. 10

Field emission scanning electron microscopy image of the worn surface of CuO/3Y-TZP tested at 19.6 N normal load and 0.4 m/s sliding velocity after 1000 m of sliding against alumina disk

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Fig. 11

Schematic diagram of the wear mechanism in different stages of lubricating film formation: (a) starting position, (b) squeezed out of Cu rich phase and wear debris formation, (c) plastic deformation of wear debris, and (d) formation of protecting film in between the contact interface

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