| CAO Yu-xia,DU Ling-zhong,ZHANG Wei-gang,LAN Ye,HUANG Chuan-bing.Study on Oxidation Resistance of Atmospheric Plasma-sprayed NiCoCrAlY/ Al2O3 Wear-resistant Coatings at Elevated Temperature[J],44(4):48-53 |
| Study on Oxidation Resistance of Atmospheric Plasma-sprayed NiCoCrAlY/ Al2O3 Wear-resistant Coatings at Elevated Temperature |
| Received:January 08, 2015 Revised:April 20, 2015 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2015.04.009 |
| KeyWord:NiCoCrAlY / Al2 O3 composite coating plasma spray oxidation resistance |
| 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, Chinese Academy of Sciences, Beijing , China |
| ZHANG Wei-gang |
State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, 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, Chinese Academy of Sciences, Beijing , China |
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| Abstract: |
| Objective To study the oxidation resistance and oxidation-resistance mechanism of atmospheric plasma-sprayed NiC- oCrAlY / Al2 O3 wear-resistant coatings at 850 ℃ . Methods The NiCoCrAlY / Al2 O3 composite powder was prepared by the technolo- gy 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 oxidation kinetic curve at constant 850 ℃ was explored with muffle furnace and the oxidation resistance mechanism of the APS sprayed NiCoCrAlY / Al2 O3 composite coatings was investigated through analysis of morphology of the coating surface after 96 h of oxidation. Results The Al2 O3 was evenly and closely coated with NiCoCrAlY alloy and the thickness of NiCoCrAlY alloy was 3 ~ 5 μm. The phase compositions of composite powder were mainly NiCoCrAlY and Al2 O3 without other impurities. The oxidation kinetics curves of the coatings can be divided into three stages: severely sloping, parabolic and slightly parabolic stages. The value of oxidation weight gain was about 4. 9 mg / cm2 after 96 h of oxidation. The oxide film was formed and the phase compositions of oxide film were Al,O, Cr and Ni according to the EDX a- nalysis. Conclusion The NiCoCrAlY / Al2 O3 composite coating exhibited excellent oxidation resistance property. The reason of oxi- dation resistance of the coating was the oxidation of Ni, Al and the addition of Al2 O3 . |
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