Improved mechanical properties of Ni-rich Ni3Al coatings produced by EB-PVD for repairing single crystal blades

Active control of turbine blade tip clearance for aircraft engine continues to be a concern in engine opera- tion, because turbine blades are subjected to wear and therefore cause an increasing tip clearance between the rotating blades and the shroud and also reduce the engine efficiency. In this wo...

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Published inRare metals Vol. 36; no. 7; pp. 556 - 561
Main Authors Sun, Jing-Yong, Pei, Yan-Ling, Li, Shu-Suo, Zhang, Hu, Gong, Sheng-Kai
Format Journal Article
LanguageEnglish
Published Beijing Nonferrous Metals Society of China 01.07.2017
Springer Nature B.V
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Online AccessGet full text
ISSN1001-0521
1867-7185
DOI10.1007/s12598-014-0340-1

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Abstract Active control of turbine blade tip clearance for aircraft engine continues to be a concern in engine opera- tion, because turbine blades are subjected to wear and therefore cause an increasing tip clearance between the rotating blades and the shroud and also reduce the engine efficiency. In this work, a Ni-rich Ni3A1 coating with γ'/γ two-phase microstructure was deposited by electron beam physical vapor deposition (EB-PVD), which worked as repairing the worn blade tips of single crystal blades. Nb molten pool was used to increase the molten pool tem- perature and thus to enhance the deposition rate. The microstructures and mechanical properties can be modified by the deposition temperatures and the following heat treatments. All coatings consist of γ' and γ phases. At deposition temperature of 600 ℃, a dense microstructure can be achieved to produce a coating with grain size of 1 μm and microhardness of -HV 477. After being heated for 4 h at a temperature of 1,100 ℃, the coatings have a more uniform microstructure, and microhardness maintains at a high level of -HV 292. Effect of Hf and Zr on EB-PVD Ni3Al repair coating will be further investigated.
AbstractList Active control of turbine blade tip clearance for aircraft engine continues to be a concern in engine operation, because turbine blades are subjected to wear and therefore cause an increasing tip clearance between the rotating blades and the shroud and also reduce the engine efficiency. In this work, a Ni-rich Ni3Al coating with γ'/γ two-phase microstructure was deposited by electron beam physical vapor deposition (EB-PVD), which worked as repairing the worn blade tips of single crystal blades. Nb molten pool was used to increase the molten pool temperature and thus to enhance the deposition rate. The microstructures and mechanical properties can be modified by the deposition temperatures and the following heat treatments. All coatings consist of γ' and γ phases. At deposition temperature of 600 °C, a dense microstructure can be achieved to produce a coating with grain size of ~1 [mu]m and microhardness of ~HV 477. After being heated for 4 h at a temperature of 1,100 °C, the coatings have a more uniform microstructure, and microhardness maintains at a high level of ~HV 292. Effect of Hf and Zr on EB-PVD Ni3Al repair coating will be further investigated.
Active control of turbine blade tip clearance for aircraft engine continues to be a concern in engine opera- tion, because turbine blades are subjected to wear and therefore cause an increasing tip clearance between the rotating blades and the shroud and also reduce the engine efficiency. In this work, a Ni-rich Ni3A1 coating with γ'/γ two-phase microstructure was deposited by electron beam physical vapor deposition (EB-PVD), which worked as repairing the worn blade tips of single crystal blades. Nb molten pool was used to increase the molten pool tem- perature and thus to enhance the deposition rate. The microstructures and mechanical properties can be modified by the deposition temperatures and the following heat treatments. All coatings consist of γ' and γ phases. At deposition temperature of 600 ℃, a dense microstructure can be achieved to produce a coating with grain size of 1 μm and microhardness of -HV 477. After being heated for 4 h at a temperature of 1,100 ℃, the coatings have a more uniform microstructure, and microhardness maintains at a high level of -HV 292. Effect of Hf and Zr on EB-PVD Ni3Al repair coating will be further investigated.
Active control of turbine blade tip clearance for aircraft engine continues to be a concern in engine operation, because turbine blades are subjected to wear and therefore cause an increasing tip clearance between the rotating blades and the shroud and also reduce the engine efficiency. In this work, a Ni-rich Ni 3 Al coating with γ′/γ two-phase microstructure was deposited by electron beam physical vapor deposition (EB-PVD), which worked as repairing the worn blade tips of single crystal blades. Nb molten pool was used to increase the molten pool temperature and thus to enhance the deposition rate. The microstructures and mechanical properties can be modified by the deposition temperatures and the following heat treatments. All coatings consist of γ′ and γ phases. At deposition temperature of 600 °C, a dense microstructure can be achieved to produce a coating with grain size of ~1 μm and microhardness of ~HV 477. After being heated for 4 h at a temperature of 1,100 °C, the coatings have a more uniform microstructure, and microhardness maintains at a high level of ~HV 292. Effect of Hf and Zr on EB-PVD Ni 3 Al repair coating will be further investigated.
Author Jing-Yong Sun Yan-Ling Pei Shu-Suo Li Hu Zhang Sheng-Kai Gong
AuthorAffiliation School of Materials Science and Engineering, BeihangUniversity, Beijing 100191, China
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Keywords Heat treatment
Electron beam physical vapor deposition
Repair coating
Ni
Al
Blades tips
Single crystal
Language English
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Notes Repair coating; Ni3A1; Electron beamphysical vapor deposition; Blades tips; Single crystal;Heat treatment
Active control of turbine blade tip clearance for aircraft engine continues to be a concern in engine opera- tion, because turbine blades are subjected to wear and therefore cause an increasing tip clearance between the rotating blades and the shroud and also reduce the engine efficiency. In this work, a Ni-rich Ni3A1 coating with γ'/γ two-phase microstructure was deposited by electron beam physical vapor deposition (EB-PVD), which worked as repairing the worn blade tips of single crystal blades. Nb molten pool was used to increase the molten pool tem- perature and thus to enhance the deposition rate. The microstructures and mechanical properties can be modified by the deposition temperatures and the following heat treatments. All coatings consist of γ' and γ phases. At deposition temperature of 600 ℃, a dense microstructure can be achieved to produce a coating with grain size of 1 μm and microhardness of -HV 477. After being heated for 4 h at a temperature of 1,100 ℃, the coatings have a more uniform microstructure, and microhardness maintains at a high level of -HV 292. Effect of Hf and Zr on EB-PVD Ni3Al repair coating will be further investigated.
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Snippet Active control of turbine blade tip clearance for aircraft engine continues to be a concern in engine opera- tion, because turbine blades are subjected to wear...
Active control of turbine blade tip clearance for aircraft engine continues to be a concern in engine operation, because turbine blades are subjected to wear...
SourceID proquest
crossref
springer
chongqing
SourceType Aggregation Database
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StartPage 556
SubjectTerms Active control
Aerospace engines
Aluminum coatings
Al涂层
Biomaterials
Blade tips
Chemistry and Materials Science
Coating effects
EB-PVD
Electron-beam physical vapor deposition
Energy
Grain size
Intermetallic compounds
Materials Engineering
Materials Science
Mechanical properties
Metallic Materials
Microhardness
Microstructure
Nanoscale Science and Technology
Ni3Al
Nickel
Nickel aluminides
Physical Chemistry
Single crystals
Tip clearance
Turbine blades
Zirconium
修复效果
单晶叶片
机械性能
电子束物理气相沉积
航空发动机
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Title Improved mechanical properties of Ni-rich Ni3Al coatings produced by EB-PVD for repairing single crystal blades
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