| Microstructural features and properties of plasma sprayed YPSZ/NiCrAlY thermal barrier coating (TBC) |
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| 作者姓名： | 孙大谦 王文权 宣兆志 宫文彪 |
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| 作者单位： | Key Laboratory of Automobile Materials，Jilin University，Changchun，130025，Key Laboratory of Automobile Materials，Jilin University，Changchun，130025，Key Laboratory of Automobile Materials，Jilin University，Changchun，130025，Key Laboratory of Automobile Materials，Jilin University，Changchun，130025 |
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| 基金项目： | ThisworkwasfinanciallysupportedbythefoundationsoftheNationalDefenseTechnologyKeyLaboratoryandNationalModernWeldingTechnologyKeyLaboratory. |
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| 摘 要： | 0 IntroductionThermalbarriercoatings(TBCs)arewidelyusedontheturbinebladesforaircraftpropulsionorpowergenerationtoreducethemetallicsubstratetemperature,whichleadstoincreasingengineefficiencyandloweringpollutantemissionsresultingfromallowableincreaseofoperationtemperature1,2].Today,TBCsareattractingmoreattentionandhavewiderpotentialapplicationstoprotecthightemperaturecomponents.However,thermalbarriercoatingshaveatendencytocrackandspallinserviceduetothermalshockandthermalcyclingbetweenambient…
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Microstructural features and properties of plasma sprayed YPSZ/NiCrAlY thermal barrier coating (TBC) |
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| Sun Daqian,Wang Wenquan,Xuan Zhaozhi and Gong Wenbiao,Key Laboratory of Automobile Materials,Jilin University,Changchun,..Microstructural features and properties of plasma sprayed YPSZ/NiCrAlY thermal barrier coating (TBC)[J].China Welding,2004,13(2). |
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| Authors: | Sun Daqian Wang Wenquan Xuan Zhaozhi and Gong Wenbiao Key Laboratory of Automobile Materials Jilin University Changchun |
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| Affiliation: | Key Laboratory of Automobile Materials,Jilin University,Changchun,130025 |
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| Abstract: | The plasma sprayed thermal barrier coating (TBC) consists of NiCrAlY bond coating and yttria partially stabilized zirconia (YPSZ) top coating. NiCrAlY coating mainly contains Ni solid solution with face centered cubic lattice, Al2O3 oxides and pores. The most obvious feature of YPSZ coating with tetragonal zirconia is a lot of vertical microcracks in this coating. The thermal insulation capability of the TBC increased with an increase in YPSZ coating thickness, the temperature drop across the TBC increasing from 60℃ to 92℃ with increasing YPSZ coating thickness with increasing YPSZ coating thickness and cracks initiated mainly in original vertical microcrack tips of the YPSZ coating and propagated not only along YPSZ coating / NiCrAlY coating interface but also through into two stages: transient oxidation stage with rapid oxidation rate and steady oxidation stage with slow oxidation. Their transition time was favorable to increase YPSZ coating toughness and to decrease the pores and oxides of the TBC system for improving thermal shock resistance and oxidation resistance of the TBC. |
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| Keywords: | plasma spray thermal barrier coating microstructure properties |
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