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.

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.

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

Thermal Insulation Property of Newspaper Membrane Encased Soil-Based Aerated Lightweight Concrete Panels

2011 ◽  
Vol 261-263 ◽  
pp. 783-787 ◽  
Author(s):  
Soon Ching Ng ◽  
Kaw Sai Low ◽  
Ngee Heng Tioh
Keyword(s):  
Temperature Gradient ◽  
Thermal Insulation ◽  
Lightweight Concrete ◽  
Clayey Soil ◽  
Heat Insulation ◽  
Control Panel ◽  
Insulation Property ◽  
Concrete Panels ◽  
Thermal Insulation Property ◽  
Insulation Performance

Roof and wall are known to be responsible for heat entering into a building and should therefore be thermally insulated in order to lessen energy consumption required for air-conditioning. In this study, four soil-based aerated lightweight concrete (ALC) panels each measures 750 mm (length) x 750 mm (breadth) x 70 mm (thick) with different aerial intensity of newspaper membrane encased were produced and tested on their thermal insulation property. For environmental friendly and economy reasons, clayey soil was used in place of sand to produce the ALC panels and they were tested in the Thermal Laboratory for twenty hours. Temperature gradient was computed based on the surface temperature measured during the test. The results obtained indicated that newspaper membrane encased soil-based ALC panels have superior heat insulation performance compared to control panel in terms of temperature gradient. It is found that the temperature gradient increased from 1.92 °C/cm to 2.08 °C/cm or 8.3% higher than control panel with just merely 0.05 g/cm2 of newspaper membrane encased.

Influence of a Thermal Barrier Coating on the Performance of a Turboprop Engine

1992 ◽  
Author(s):  
J. D. MacLeod ◽  
J. C. G. Laflamme
Keyword(s):  
Surface Roughness ◽  
Thermal Barrier Coating ◽  
Coating Thickness ◽  
Ceramic Coating ◽  
National Research Council ◽  
Engine Performance ◽  
Thermal Barrier ◽  
Barrier Coating ◽  
Project Objectives ◽  
The Impact

Under the sponsorship of the Canadian Department of National Defence, the Engine Laboratory of the National Research Council of Canada has evaluated the influence of applying a thermal barrier coating on the performance of a gas turbine engine. The effort is aimed at quantifying the performance effects of a particular ceramic coating on the first stage turbine vanes. The long term objective of the program is to both assess the relative change in engine performance and compare against the claimed benefits of higher possible turbine inlet temperatures, longer time in service and increased time between overhauls. The engine used for this evaluation was the Allison T56 turboprop with the first stage turbine nozzles coated with the Chromalloy RT-33 ceramic coating. The issues addressed in testing this particular type of hot section coating were; 1) effect of coating thickness on nozzle effective flow area; 2) surface roughness influence on turbine efficiency; This paper describes the project objectives, the experimental installation, and the results of the performance evaluations. Discussed are performance variations due to coating thickness and surface roughness on engine performance characteristics. As the performance changes were small, a rigorous measurement uncertainty analysis is included. The coating application process, and the affected overhaul procedures are examined. The results of the pre- and post-coating turbine testing are presented, with a discussion of the impact on engine performance.

Thermographic measurement of thermal barrier coating thickness

2005 ◽  
Author(s):  
Steven M. Shepard ◽  
Yu L. Hou ◽  
James R. Lhota ◽  
David Wang ◽  
Tasdiq Ahmed
Keyword(s):  
Thermal Barrier Coating ◽  
Coating Thickness ◽  
Thermal Barrier ◽  
Barrier Coating ◽  
Thermographic Measurement

scholarly journals The Thermal Conductivity of 8 Yttria Stabilized Zirconia and Mullite Thermal Barrier Coating on Medium Carbon Steel Substrate

2019 ◽  
Vol 9 (1) ◽  
pp. 5886-5892
Keyword(s):  
Thermal Conductivity ◽  
Carbon Steel ◽  
Thermal Barrier Coating ◽  
Steel Substrate ◽  
Medium Carbon Steel ◽  
Yttria Stabilized Zirconia ◽  
Thermal Barrier ◽  
Stabilized Zirconia ◽  
Medium Carbon ◽  
Barrier Coating

Thermal conductivity is one of the main features of a thermal barrier coating (TBC) that is important in making sure that the TBC gives its best functionality to the system. A good TBC has low thermal conductivity, so that the temperature can drop across the coating which allows the system to operate in extremely high temperatures. There are several factors that can influence the thermal conductivity of the TBC such as the type of ceramic material used, the deposition method and the physical features of the TBC itself. For this research, air plasma spray (APS) is used to deposit 8 wt% yttria stabilized zirconia (8YSZ) and mullite on medium carbon steel substrates to study their respective thermal conductivities. The aim here is to develop a heat shield using TBC to protect the electric motor in an electrical turbocompounding system. The characteristics of the deposited TBC such as microstructure, element composition, phases and thermal conductivity are studied. The thermal conductivity is reduced when medium carbon steel substrate deposited with TBC. The thermal conductivity of 8YSZ, mullite and uncoated sample at minute 60 is 0.868 W/mK, 0.903 W/mK and 1.057 W/mK, respectively. Therefore, the deposition of 8YSZ TBC can lower the thermal conductivity of the medium carbon steel heat shield.

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

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