Thermal Diffusivity Measurements of Thermal Barrier Coatings and Carbon Fibre/Carbon Composites

1985 ◽  
pp. 447-469
Author(s):  
Roy Taylor
Keyword(s):  
Thermal Diffusivity ◽  
Carbon Fibre ◽  
Thermal Barrier Coatings ◽  
Carbon Composites ◽  
Thermal Barrier ◽  
Barrier Coatings ◽  
Diffusivity Measurements

Microstructure and Thermal Conductivity Characteristics of Sm2Zr2O7+8YSZ Type TBCs

2013 ◽  
Vol 336 ◽  
pp. 91-96
Author(s):  
Grzegorz Moskal ◽  
Marta Mikuśkiewicz
Keyword(s):  
Thermal Conductivity ◽  
Thermal Diffusivity ◽  
Thermal Barrier Coatings ◽  
Thermal Barrier ◽  
Barrier Coatings ◽  
Diffusivity Measurements ◽  
Plasma Sprayed

The article presents results of microstructural investigations of plasma sprayed ceramic thermal barrier coatings obtained using Sm2Zr2O7+8YSZ and 8YSZ powders in 50/50, 25/75 and 75/25 proportions. The coatings thickness is evaluated and spherical, horizontal and vertical porosity is quantitatively and qualitatively characterized. The results obtained in this investigation were used for adjusted values of thermal conductivity calculations on the basis of results obtained from thermal diffusivity measurements at temperatures between 20 and 1100°C.

scholarly journals Optimal parameterization in the measurements of the thermal diffusivity of thermal barrier coatings

2007 ◽  
Vol 11 (1) ◽  
pp. 137-156
Author(s):  
Nenad Milosevic
Keyword(s):  
Thermal Diffusivity ◽  
Thermal Barrier Coatings ◽  
Steel Substrate ◽  
Thermal Contact ◽  
Copper Substrate ◽  
Estimation Procedure ◽  
Laser Flash ◽  
Flash Method ◽  
Thermal Barrier ◽  
Barrier Coatings

The paper presents an estimation procedure for the measurement of the thermal diffusivity of thermal barrier coatings deposited on thermal conductive substrates using the laser flash method when the thermal contact resistance between the coating and substrate is unknown. The procedure is based on the application of the optimal parameterization technique and Gauss minimization algorithm. It has been applied on the experimental data obtained by using two different samples, one made of PTFE (polytetrafluoroethylene) coating deposited on a stainless steel substrate and the other made of PVC (polyvinylchloride) deposited on a copper substrate. .

Thermal Diffusivity/Microstructure Relationship in Y-PSZ Thermal Barrier Coatings

1999 ◽  
Vol 8 (1) ◽  
pp. 102-109 ◽  
Author(s):  
F. Cernuschi ◽  
P. Bianchi ◽  
M. Leoni ◽  
P. Scardi
Keyword(s):  
Thermal Diffusivity ◽  
Thermal Barrier Coatings ◽  
Thermal Barrier ◽  
Barrier Coatings

scholarly journals Synthesis, Characterization and Thermal Diffusivity of Holmium and Praseodymium Zirconates

2016 ◽  
Vol 61 (2) ◽  
pp. 1249-1254 ◽  
Author(s):  
M. Stopyra ◽  
D. Niemiec ◽  
G. Moskal
Keyword(s):  
Thermal Diffusivity ◽  
Thermal Barrier Coatings ◽  
Single Phase ◽  
Fluorite Structure ◽  
Thermal Barrier ◽  
Complex Method ◽  
Insulation Layer ◽  
Barrier Coatings ◽  
Decomposition Of Solid Solution ◽  
Insulating Properties

Abstract A2B2O7 oxides with pyrochlore or defected fluorite structure are among the most promising candidates for insulation layer material in thermal barrier coatings. The present paper presents the procedure of synthesis of holmium zirconate Ho2Zr2O7 and praseodymium zirconate Pr2Zr2O7 via Polymerized-Complex Method (PCM). Thermal analysis of precursor revealed that after calcination at relatively low temperature (700°C) fine-crystalline, single-phase material is obtained. Thermal diffusivity was measured in temperature range 25-200°C, Ho2Zr2O7 exhibits lower thermal diffusivity than Pr2Zr2O7. Additionally, PrHoZr2O7 was synthesized. The powder in as-calcined condition is single-phase, but during the sintering decomposition of solid solution took place and Ho-rich phase precipitated. This material exhibited the best insulating properties among the tested ones.

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