Thermal Durability of Thermal Barrier Coatings with Blended Feedstock of Lanthanum Zirconate in cyclic thermal exposure > Detailed Program

Code No.	ME-P82
Name	Dr. Zhe Lu
Affiliation	1School of Materials Science and Engineering
Title	Thermal Durability of Thermal Barrier Coatings with Blended Feedstock of Lanthanum Zirconate in cyclic thermal exposure
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Co-author-1	Prefix	Mr.
	Country	Korea
	First name	Sung-Hoon
	Last name	Jung
	Affiliation
	Department
	E-mail
	Cell phone

Co-author-2	Prefix	Mr.
	Country
	First name	Do-won
	Last name	Song
	Affiliation	Hanyang University
	Department	Department of Energy Engineering
	E-mail
	Cell phone

Co-author-3	Prefix	Prof.
	Country	Korea
	First name	Yeon-Gil
	Last name	Jung
	Affiliation	Changwon National University
	Department	School of Nano and Advanced Materials Engineering
	E-mail
	Cell phone

Contents
Lanthanum zirconate (La2Zr2O7) is very promising material for advanced thermal barrier coating (TBC) application, because it has lower thermal conductivity and greater sintering resistance than yttria-stabilized-zirconia (YSZ). However, TBC system with La2Zr2O7 shows a low thermal durability due to the lower coefficient of thermal expansions compared with that of a bond coat. To improve the thermal durability of La2Zr2O7 based TBCs and to give both thermal and mechanical properties to TBCs, microstructure was designed with blended feedstock powders which were consisted of La2Zr2O7 and YSZ with different volume ratios (50:50 and 25:75). Layered microstructure with a buffer layer was deposited by air plasma spray method, and then thermal durability of each TBC was evaluated through the cyclic furnace thermal fatigue (CFTF) and flame thermal fatigue (FTF) tests. The TBC with the buffer layer showed improved thermal durability than single layered TBC in the both cycling thermal exposure tests. The relationship between microstructure design and thermal durability is extensively discussed based on the thermomechanical properties and microstructural evolution during cyclic thermal exposure.

Contents

Lanthanum zirconate (La2Zr2O7) is very promising material for advanced thermal barrier coating (TBC) application, because it has lower thermal conductivity and greater sintering resistance than yttria-stabilized-zirconia (YSZ). However, TBC system with La2Zr2O7 shows a low thermal durability due to the lower coefficient of thermal expansions compared with that of a bond coat. To improve the thermal durability of La2Zr2O7 based TBCs and to give both thermal and mechanical properties to TBCs, microstructure was designed with blended feedstock powders which were consisted of La2Zr2O7 and YSZ with different volume ratios (50:50 and 25:75). Layered microstructure with a buffer layer was deposited by air plasma spray method, and then thermal durability of each TBC was evaluated through the cyclic furnace thermal fatigue (CFTF) and flame thermal fatigue (FTF) tests. The TBC with the buffer layer showed improved thermal durability than single layered TBC in the both cycling thermal exposure tests. The relationship between microstructure design and thermal durability is extensively discussed based on the thermomechanical properties and microstructural evolution during cyclic thermal exposure.

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