scholarly journals A Basic Study on High-Temperature Protective Coating Design of Single Crystal Ni Based Super Alloy.

1997 ◽  
Vol 46 (6) ◽  
pp. 684-689
Author(s):  
Yoshiyasu ITOH ◽  
Masataka TAMURA ◽  
Yasuo TAKAHASHI
Keyword(s):  
High Temperature ◽  
Single Crystal ◽  
Protective Coating ◽  
Basic Study ◽  
Coating Design ◽  
Super Alloy

scholarly journals Interdiffusion Behaviour of NiCoCrAlY Coating and N5 Single Crystal Superalloy

Coatings ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 393
Author(s):  
Jiaxu Cao ◽  
Yingkun Liu ◽  
Chunming Deng ◽  
Kun Yang ◽  
Feng Li
Keyword(s):  
High Temperature ◽  
Single Crystal ◽  
Reaction Zone ◽  
Protective Coating ◽  
Energy Dispersive Spectrometer ◽  
Secondary Reaction ◽  
Single Crystal Superalloy ◽  
Interdiffusion Zone ◽  
Secondary Reaction Zone ◽  
Static Oxidation

This paper aims at investigating the microstructure and phases evolution of single crystal superalloy/high temperature protective coating during high temperature static oxidation, and exploring the influence of element interdiffusion behaviour on microstructure and phase evolution of the single crystal superalloy substrate. A NiCoCrAlY high-temperature protective coating was deposited on the Ni-based single-crystal superalloy by low-pressure plasma spraying technology. The coated samples were subjected to static oxidation for 200 h at a constant temperature of 1100 °C. Scanning electron microscope, energy dispersive spectrometer and X-ray diffraction were used to characterise the microstructure and phase after interdiffusion between the coating and the substrate at high temperature. The results showed that a dense thermally grown oxide layer was formed on the surface of the NiCoCrAlY coating after oxidation for over 100 h. The only interdiffusion zone was formed after oxidation for 50 h, while both interdiffusion zone and secondary reaction zone could be observed after oxidation for over 100 h. The thickness of interdiffusion zone and secondary reaction zone is increased with the extension of oxidation time, and the grain growth of topological close-packed phase in the secondary reaction zone is found. Al, Cr and Co in the coating diffuse from the coating to the substrate, while Ni and refractory materials like Ta, Mo, Re and W diffuse from the coating to the substrate. The interdiffusion of coating and substrate leads to the instability of γ/γ′ phase in the substrate, which finally results in the formation of W, Re and Cr-rich needle-like topological close-packed phase in the substrate.

Effects of Nano-Al2O3p on High Temperature Frictional Wear Behaviors of NiCoCrAIY Cladded Coatings

2012 ◽  
Vol 426 ◽  
pp. 40-43 ◽  
Author(s):  
Hong Yu Wang ◽  
Dun Wen Zuo ◽  
X.F. Li ◽  
Ming Di Wang ◽  
Y.F. Zhao
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
Wear Rate ◽  
Protective Coating ◽  
Oxidation Behavior ◽  
Frictional Coefficient ◽  
Nano Particles ◽  
High Temperature Wear ◽  
Frictional Wear ◽  
Super Alloy

To study effects of nano-Al2O3p (nanometric Al2O3 particles) on high temperature frictional wear behaviors of the NiCoCrAlY coating (a high temperature protective coating), three NiCoCrAlY coatings strengthened by different contents of nano-Al2O3p were prepared on a Ni-based super alloy by using laser cladding technology and their dry frictional wear behaviors at 500 °C in static air were investigated. The comparison was made with the coating without nano-particles. The results show that the frictional coefficient of the coatings increased with the hardness after adding nano-Al2O3p and the wear resistance of the coatings was enhanced. Among nano-Al2O3p-added coatings, the coating added with 1.0 wt% nano-Al2O3p performs best. The wear rate of the coating is only 58% of the coating without nano-particles. Moreover, the improvement of the oxidation behavior plays an important role in improving the high temperature wear resistance.

Creep and damage of a Re/Ru-containing single crystal nickel-based alloy at high temperature

2021 ◽  
Vol 808 ◽  
pp. 140870
Author(s):  
Huajin Yan ◽  
Sugui Tian ◽  
Guoqi Zhao ◽  
Ning Tian ◽  
Shunke Zhang
Keyword(s):  
High Temperature ◽  
Single Crystal ◽  
Nickel Based Alloy

Volume Nanophase Hardening in Single-Crystal Nickel Alloy Zhs36-VI [001] After High-Temperature Holds

2014 ◽  
Vol 56 (3-4) ◽  
pp. 171-174
Author(s):  
V. P. Kuznetsov ◽  
V. P. Lesnikov ◽  
I. P. Konakova ◽  
N. A. Popov
Keyword(s):  
High Temperature ◽  
Single Crystal ◽  
Nickel Alloy
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