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Research Papers: Micro-Nano Tribology

A Preliminary Study on Hybrid Use of Thermal Spray Coating and Ultrasonic Nanocrystalline Surface Modification Technique on the Tribological Properties of Yttria-Stabilized Zirconia Coating

[+] Author and Article Information
Auezhan Amanov

Mechanical Engineering Department,
Sun Moon University,
100, Kalsan-ri,
Asan 336-708, South Korea
e-mail: avaz2662@sunmoon.ac.kr

Young-Sik Pyun

Mechanical Engineering Department,
Sun Moon University,
100, Kalsan-ri,
Asan 336-708, South Korea
e-mail: pyoun@sunmoon.ac.kr

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received August 24, 2015; final manuscript received December 14, 2015; published online April 27, 2016. Assoc. Editor: Robert Wood.

J. Tribol 138(3), 032002 (Apr 27, 2016) (8 pages) Paper No: TRIB-15-1313; doi: 10.1115/1.4032524 History: Received August 24, 2015; Revised December 14, 2015

An ultrasonic nanocrystal surface modification (UNSM) technique was applied to a thermally sprayed yttria-stabilized zirconia (YSZ) ceramic coating deposited onto a hot tool steel substrate to improve the mechanical and tribological properties. The friction test results showed that the UNSM-treated coating had a smoother surface, a lower friction, and a higher resistance to wear compared to that of the as-sprayed coating. It was also demonstrated that the UNSM technique improved the adhesion behavior of the coating by about 24%. Hence, it was found that a hybrid use of thermal spray coating (TSC) and UNSM technique is a meaningful way to bring together synergy effect of two emerging surface technologies in terms of tribology.

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Figures

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Fig. 1

Cross-sectional scanning electron microscope (SEM) image of the specimen: YSZ top coating, NiCrAlY bond coating and hot tool steel substrate

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Fig. 2

SEM images of the thermally sprayed YSZ ceramic coatings before and after UNSM treatment

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Fig. 3

Surface roughness profiles of the thermally sprayed YSZ ceramic coatings before and after UNSM treatment

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Fig. 4

Raman spectra taken from the as-sprayed and UNSM-treated thermally sprayed YSZ ceramic coatings

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Fig. 5

Friction coefficient of the as-sprayed and UNSM-treated thermally sprayed YSZ ceramic coatings at temperatures of 25 °C (a) and 200 °C (b)

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Fig. 6

Comparison of the wear rate for the as-sprayed and UNSM-treated coatings and counter surface balls at temperatures of 25 and 200 °C

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Fig. 7

Cross-sectional profile of wear tracks formed on the as-sprayed (a) and (c) and UNSM-treated (b) and (d) thermally sprayed YSZ ceramic coatings at temperature of 25 and 200 °C, respectively

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Fig. 8

SEM images of partially wear track generated on the as-sprayed (a) and (c) and UNSM-treated (b) and (d) thermally sprayed YSZ ceramic coatings at temperatures of 25 and 200 °C, respectively

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Fig. 9

EDX spectra taken from wear tracks formed on the as-sprayed (a) and (c) and UNSM-treated (b) and (d) YSZ ceramic coatings at temperature of 25 and 200 °C, respectively

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Fig. 10

Raman spectra taken from wear tracks formed on the as-sprayed and UNSM-treated coatings at temperatures of 25 °C (a) and 200 °C (b)

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Fig. 11

Comparison of G-bond intensity peak taken from wear tracks formed on the as-sprayed and UNSM-treated coatings before, and after friction and wear tests at temperatures of 25 °C (a) and 200 °C (b), respectively

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Fig. 12

Scratch behavior of the as-sprayed (a) and UNSM-treated (b) coatings

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