| FENG Yan-han,FANG Jian-hua,WU Jiang,OU Zhong-wen,LIU Ping,SUN Zheng.Preparation and Property Research of Graphene/Al2O3+13%TiO2 Self-lubricating Coatings Fabricated by Plasma Spray[J],48(12):189-195 |
| Preparation and Property Research of Graphene/Al2O3+13%TiO2 Self-lubricating Coatings Fabricated by Plasma Spray |
| Received:March 26, 2019 Revised:December 20, 2019 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2019.12.022 |
| KeyWord:graphene plasma spray ceramic coating tribological property mechanical property self-lubricating |
| Author | Institution |
| FENG Yan-han |
a.Department of Oil, Army Logistics University, Chongqing , China |
| FANG Jian-hua |
a.Department of Oil, Army Logistics University, Chongqing , China |
| WU Jiang |
a.Department of Oil, Army Logistics University, Chongqing , China |
| OU Zhong-wen |
b.Department of Military Installation, Army Logistics University, Chongqing , China |
| LIU Ping |
a.Department of Oil, Army Logistics University, Chongqing , China |
| SUN Zheng |
c.Unit 95696, Army Logistics University, Chongqing , China |
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| Abstract: |
| The paper aims to research the effects of graphene and graphite on mechanical properties and tribology performance of Al2O3+13% TiO2 (AT-13) ceramic coating prepared by atmospheric plasma spray. Graphene /AT-13 and graphite (AT-13) composite coatings with 1% mass fraction and pure AT-13 coatings were prepared by atmospheric plasma spray. Rockwell apparatus was adopted to test the harness of the coating. The breaking tenacity of the coating was judged based on situations around the indentation. Tribological and mechanical properties were tested with a reciprocating friction wear testing machine. The microstructure of the coatings was observed with a scanning electron microscope (SEM). Energy dispersive spectroscopy (EDS) was used to analyze element distribution and surface contourgraph was used to measure the topography of the wearing surface. The phase composition of the coatings was analyzed with an X-ray diffraction spectrum (XRD). The structure change of grapheme before and after spraying was characterized with raman spectrometer. Graphene exhibited an excellent performance as a nanofiller for enhancing the tribological and mechanical properties of the coatings. Friction coefficient and wear rate of the GN/AT-13 coatings declined for 13% and 19%, respectively; and the Rockwell hardness increased about 10%. Meanwhile, the friction coefficient and wear rate decreased with the increase of load. The Gpt/AT-13 coatings showed an improvement of 30% for the Rockwell hardness, but the fracture toughness decreased dramatically. Furthermore, the Gpt/AT-13 coatings exhibited a limited benefit for the tribological and mechanical properties. FESEM image of the GN/AT-13 and Gpt/AT-13 coatings showed a more uniform and compact microstructure in contrast to the lamellar structure of the AT-13 coatings. Graphene was confirmed to exist in the tribo-film of the wear scar, but the structure was damaged in a certain extent according to the EDS and Raman spectrum. Graphene can improve the tribological property and mechanical property of AT-13 coatings. |
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