Self-Enhancing Thermal Insulation Performance of Bimodal-Structured Thermal Barrier Coating

2018 ◽  
Vol 27 (7) ◽  
pp. 1064-1075 ◽  
Author(s):  
Wei-Wei Zhang ◽  
Guang-Rong Li ◽  
Qiang Zhang ◽  
Guan-Jun Yang ◽  
Guo-Wang Zhang ◽  
...  
Keyword(s):  
Thermal Barrier Coating ◽  
Thermal Insulation ◽  
Thermal Barrier ◽  
Barrier Coating ◽  
Insulation Performance

scholarly journals Effect of Thermal Barrier Coating on the Thermal Stress of Gas Microturbine Blades and Nozzles

2020 ◽  
Vol 66 (10) ◽  
pp. 581-590
Author(s):  
Oscar Tenango-Pirin ◽  
Elva Reynoso-Jardón ◽  
Juan Carlos García ◽  
Yahir Mariaca ◽  
Yuri Sara Hernández ◽  
...  
Keyword(s):  
Thermal Stress ◽  
Thermal Barrier Coating ◽  
Thermal Insulation ◽  
Turbine Blades ◽  
Temperature Fields ◽  
Maximum Temperature ◽  
Thermal Barrier ◽  
New Materials ◽  
Barrier Coating ◽  
Operational Life

Thermal barrier coatings play a key role in the operational life of microturbines because they reduce thermal stress in the turbine components. In this work, numerical computations were carried out to assess new materials developed to be used as a thermal barrier coating for gas turbine blades. The performance of the microturbine components protection is also evaluated. The new materials were 8YSZ, Mg2SiO4, Y3Ce7Ta2O23.5, and Yb3Ce7Ta2O23.5. For testing the materials, a 3D gas microturbine model is developed, in which the fluid-structure interaction is solved using CFD and FEM. Temperature fields and stress magnitudes are calculated on the nozzle and blade, and then these are compared with a case in which no thermal barrier is used. Based on these results, the non-uniform temperature distributions are used to compute the stress levels in nozzles and blades. Higher temperature gradients are observed on the nozzle; the maximum temperature magnitudes are observed in the blades. However, it is found that Mg2SiO4 and Y3Ce7Ta2O23.5 provided better thermal insulation for the turbine components compared with the other evaluated materials. Mg2SiO4 and Y3Ce7Ta2O23.5 presented the best performance regarding stress and thermal insulation for the microturbine components. Keywords: thermal barrier coating, gas microturbine, turbine blade, thermal stress

scholarly journals Phase stability and thermal insulation of YSZ and erbia-yttria co-doped zirconia EB-PVD thermal barrier coating systems

2020 ◽  
Vol 389 ◽  
pp. 125566 ◽  
Author(s):  
G. Boissonnet ◽  
C. Chalk ◽  
J.R. Nicholls ◽  
G. Bonnet ◽  
F. Pedraza
Keyword(s):  
Thermal Barrier Coating ◽  
Thermal Insulation ◽  
Phase Stability ◽  
Thermal Barrier ◽  
Barrier Coating ◽  
Co Doped

Bonding Strength and Thermal Insulation Property of Thermal Barrier Coating with Nanometer Alumina Coated Zirconia

2018 ◽  
Vol 281 ◽  
pp. 558-563
Author(s):  
Zhong Zhou Yi ◽  
Min Lu ◽  
Ke Shan ◽  
Nan Li ◽  
Feng Rui Zhai ◽  
...  
Keyword(s):  
Thermal Barrier Coating ◽  
Thermal Insulation ◽  
Coating Thickness ◽  
Bonding Strength ◽  
Heat Insulation ◽  
Steel Substrate ◽  
Thermal Barrier ◽  
Insulation Property ◽  
Barrier Coating ◽  
Thermal Insulation Property

The thermal barrier coating samples of different thickness with alumina coated zirconia and zirconia as coating materials were prepared on the surface of heat resistant alloy steel substrate after activation treatment with NiCoCrAlY as adhesive transition layer by plasma spraying method and spray gun quick spraying process. The bonding strength and thermal insulation property of two kinds of ceramic coating with the same thickness were compared by the test results of bonding strength, high temperature heat insulation and microstructure, and the relationship between the coating thickness and heat insulation effect were investigated. The results indicate that the structure and property of thermal barrier coating using nanoAl2O3coated ZrO2-Y2O3powder are superior to that using single zirconia powder. The thermal insulation property of the thermal barrier coating increased with the increasing of coating thickness, and the advantage is more obvious with temperature increasing.

scholarly journals Thermal Shock Resistance and Thermal Insulation Capability of Laser-Glazed Functionally Graded Lanthanum Magnesium Hexaluminate/Yttria-Stabilised Zirconia Thermal Barrier Coating

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3865
Author(s):  
Muhammed Anaz Khan ◽  
Annakodi Vivek Anand ◽  
Muthukannan Duraiselvam ◽  
Koppula Srinivas Rao ◽  
Ramachandra Arvind Singh ◽  
...  
Keyword(s):  
Thermal Shock ◽  
Thermal Barrier Coating ◽  
Thermal Insulation ◽  
Thermal Shock Resistance ◽  
Functionally Graded ◽  
Thermal Barrier ◽  
Laser Glazing ◽  
Heat Management ◽  
Barrier Coating ◽  
Shock Resistance

In this work, functionally graded lanthanum magnesium hexaluminate (LaMgAl11O19)/yttria-stabilised zirconia (YSZ) thermal barrier coating (FG-TBC), in as-sprayed and laser-glazed conditions, were investigated for their thermal shock resistance and thermal insulation properties. Results were compared with those of a dual-layered coating of LaMgAl11O19 and YSZ (DC-TBC). Thermal shock tests at 1100 °C revealed that the as-sprayed FG-TBC had improved thermal stability, i.e., higher cycle lifetime than the as-sprayed DC-TBC due to its gradient architecture, which minimised stress concentration across its thickness. In contrast, DC-TBC spalled at the interface due to the difference in the coefficient of thermal expansion between the LaMgAl11O19 and YSZ layers. Laser glazing improved cycle lifetimes of both the types of coatings. Microstructural changes, mainly the formation of segmentation cracks in the laser-glazed surfaces, provided strain tolerance during thermal cycles. Infrared rapid heating of the coatings up to 1000 °C showed that the laser-glazed FG-TBC had better thermal insulation capability, as interlamellar pores entrapped gas and constrained heat transfer across its thickness. From the investigation, it is inferred that (i) FG-TBC has better thermal shock resistance and thermal insulation capability than DC-TBC and (ii) laser glazing can significantly enhance the overall thermal performance of the coatings. Laser-glazed FG-TBC provides the best heat management, and has good potential for applications that require effective heat management, such as in gas turbines.

Reaction Mechanism and Thermal Insulation Property of Al-deposited 7YSZ Thermal Barrier Coating

2015 ◽  
Vol 31 (10) ◽  
pp. 1006-1010 ◽  
Author(s):  
Xiaofeng Zhang ◽  
Kesong Zhou ◽  
Wei Xu ◽  
Jinbing Song ◽  
Chunming Deng ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Thermal Barrier Coating ◽  
Thermal Insulation ◽  
Thermal Barrier ◽  
Insulation Property ◽  
Barrier Coating ◽  
Thermal Insulation Property

Thermal Insulation Property of Nanostructured Alumina Coated Zirconia Thermal Barrier Coating

2016 ◽  
Vol 697 ◽  
pp. 377-380 ◽  
Author(s):  
Zhong Zhou Yi ◽  
Ke Shan ◽  
Feng Rui Zhai ◽  
Hong Yan Sun ◽  
Zhi Peng Xie
Keyword(s):  
Thermal Barrier Coating ◽  
Thermal Insulation ◽  
Thermal Barrier ◽  
Zirconia Powder ◽  
Insulation Property ◽  
Barrier Coatings ◽  
Structure And Property ◽  
Barrier Coating ◽  
Thermal Insulation Property ◽  
Spraying Method

nanostructured Al2O3 coated ZrO2-Y2O3 thermal barrier coatings were prepared by plasma spraying method using nanostructured alumina coated 8mol%Y2O3 stabilized ZrO2 powder as starting material and the thermal insulation property was investigated as a function of the thickness of the coating. The results indicate that the structure and property of thermal barrier coating using nanoAl2O3 coated ZrO2-Y2O3 powder was superior to that of using single zirconia powder. The thermal insulation property of the thermal barrier coating increased with thickness of the coating increasing, and the advantage is more obvious with temperature increasing.

HOT CORROSION OF CERIA-YTTRIA STABILIZED ZIRCONIA PLASMA SPRAYED THERMAL BARRIER COATING BY EUTECTIC VANDIUM PENTAOXIDE-SODIUM SULFATE

2018 ◽  
Vol 18 (1) ◽  
pp. 182-192 ◽  
Author(s):  
Mohammed J Kadhim ◽  
Mohammed H Hafiz ◽  
Maryam A Ali Bash
Keyword(s):  
Thermal Barrier Coating ◽  
Hot Corrosion ◽  
Monoclinic Phase ◽  
Volume Fraction ◽  
High Volume ◽  
Thermal Barrier ◽  
Air Plasma ◽  
Plan View ◽  
Barrier Coating ◽  
Plasma Sprayed

The high temperature corrosion behavior of thermal barrier coating (TBC) systemconsisting of IN-738 LC superalloy substrate, air plasma sprayed Ni24.5Cr6Al0.4Y (wt%)bond coat and air plasma sprayed ZrO2-20 wt% ceria-3.6 wt% yttria (CYSZ) ceramic coatwere characterized. The upper surfaces of CYSZ covered with 30 mg/cm2 , mixed 45 wt%Na2SO4-55 wt% V2O5 salt were exposed at different temperatures from 800 to 1000 oC andinteraction times from 1 up to 8 h. The upper surface plan view of the coatings wereidentified for topography, roughness, chemical composition, phases and reaction productsusing scanning electron microscopy, energy dispersive spectroscopy, talysurf, and X-raydiffraction. XRD analyses of the plasma sprayed coatings after hot corrosion confirmed thephase transformation of nontransformable tetragonal (t') into monoclinic phase, presence ofYVO4 and CeVO4 products. Analysis of the hot corrosion CYSZ coating confirmed theformation of high volume fraction of YVO4, with low volume fractions of CeOV4 and CeO2.The formation of these compounds were combined with formation of monoclinic phase (m)from transformation of nontransformable tetragonal phase (t').

Evaluation of Spatial Resolution of Nondestructive Testing of Thermal Barrier Coating by Terahertz Imaging

2012 ◽  
Vol 132 (10) ◽  
pp. 864-870
Author(s):  
Tetsuo Fukuchi ◽  
Norikazu Fuse ◽  
Mitsutoshi Okada ◽  
Tomoharu Fujii ◽  
Maya Mizuno ◽  
...  
Keyword(s):  
Nondestructive Testing ◽  
Thermal Barrier Coating ◽  
Spatial Resolution ◽  
Terahertz Imaging ◽  
Thermal Barrier ◽  
Barrier Coating
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