| CAO Yu-xia,DU Ling-zhong,ZHANG Wei-gang,LAN Ye,HUANG Chuan-bing.Study on Preparation and Tribological Properties of Atmospheric Plasma-sprayed NiCoCrAlY/ Al2O3 Wear-resistant Coatings[J],44(5):62-66 |
| Study on Preparation and Tribological Properties of Atmospheric Plasma-sprayed NiCoCrAlY/ Al2O3 Wear-resistant Coatings |
| Received:January 08, 2015 Revised:May 20, 2015 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2015.05.012 |
| KeyWord:NiCoCrAlY / Al2 O3 composite coating plasma spraying tribological property |
| Author | Institution |
| CAO Yu-xia |
Department of Environmental and Chemical Engineering, Tangshan College, Tangshan , China |
| DU Ling-zhong |
State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering of Chinese Academy of Sciences, Beijing , China |
| ZHANG Wei-gang |
State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering of Chinese Academy of Sciences, Beijing , China |
| LAN Ye |
Botian Environmental Group Limited by Share Ltd, Beijing , China |
| HUANG Chuan-bing |
State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering of Chinese Academy of Sciences, Beijing , China |
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| Abstract: |
| Objective To prepare the atmospheric plasma-sprayed NiCoCrAlY/ Al2O3 wear-resistant coatings and study the tribological properties and tribological mechanism of the coating. Methods The NiCoCrAlY / Al2 O3 composite powder was prepared by the technology of spray granulation, chemical and metallurgical coating and solid state alloying. The NiCoCrAlY / Al2 O3 composite coating was prepared by atmospheric plasma-spray technology using the prepared powder on the surface of 45# steel. The microstructure and phase composition of the powder and coating were studied by SEM and XED. The tribological properties and tribological mechanism of the APS sprayed NiCoCrAlY / Al2 O3 composite coatings were investigated. Results The surface of Al2 O3 particles was evenly coated with NiCoCrAlY alloy and the thickness of NiCoCrAlY alloy was 3 ~ 5 μm. The composite coatings consisted of elongated lamellae and they integrated with each other very well. The phase compositions of composite powder were NiCrAl and Al2 O3 . The friction coefficient of the coating decreased with the increase of temperature. The friction coefficient of the coating was 0. 64 at room temperature and decreased to below 0. 4 at 800 ℃ , which was due to the formation of metallic oxide. The wear rate of the coating first increased and then decreased with the increase of temperature. The abrasive mechanism of the NiCoCrAlY / Al2 O3 composite coatings was dominated by mixed brittle crack and abrasive at low temperature, and it was characterized by oxidation, abrasive, plastic deformation and as well as coating transfer to the coupled pin at high temperature. Conclusion The atmospheric plasma-sprayed NiCoCrAlY / Al2 O3 composite coating exhibited excellent wear-resistant performance by high temperature selflubrication. |
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