TY  - EJOU
AU  - Li, Pan 
AU  - Jin, Xiaochao 
AU  - Lv, Pin 
AU  - Fan, Xueling 

TI  - The	Correlation	Between	the	Cyclic	Oxidation	Behavior	of	EB-PVD	TBC	 and	Refurbishment	Process
T2  - The International Conference on Computational \& Experimental Engineering and Sciences

PY  - 2023
VL  - 26
IS  - 1
SN  - 1933-2815

AB  - Refurbishment	of	thermal	barrier	coating	(TBC)	has	become	a	valuable	technique to	prolong	the	service	life	
of	 high-temperature	 components.	 In	 this	 work,	 the	 effect	 of	 refurbishment	 process	 on	 the	 oxidation	
behaviors	of	TBC	was investigated.	Before	recoating,	the	soft	chemical	stripping	method	was	used	to	remove	
TBC	from	DD6	single-crystal	superalloy. The	results	showed	that	a	certain	amount	of	IDZ	layer	with	Cr-rich	
would	be	retained	in	the	DD6	superalloy	substrate	after	coating	removal.		The	characteristics	of	the	β	phases	
change	from	the	elongated	grain	shapes	and	a	high	aspect	ratio	in	the	ordinary	specimens	to	the	equiaxed	
shape	in	the	refurbished	specimens.	Moreover, mixed	oxides	were	earlier	observed	during	cyclic	oxidation	
of	the	refurbished	TBC	specimens,	whose	thickness	was	always	higher	than	that	of	the	ordinary	TBC due to	
the	influence	of	BC	layer	phase	sizes.	The	growth	mechanism	of	TGO	(Al<sub>2</sub>O<sub>3</sub> layer)	in	the	refurbished	TBC	
specimens	 was	 affected	 by	 the	 refurbishment	 process.	 In	 addition,	 under	 cyclic	 oxidation	 with	 water	
quenching	at	1100	℃,	the	cracks	in	the	refurbished	specimens	were	more	likely	to	occur	in	the	mixed	oxides	
layer,	while	the	cracks	in	the	ordinary	specimens	were	more	likely	to	occur	in	the	TC	layer,	due	to	the	earlier	
and	thicker	mixed	oxides	layer	formed	in	refurbished	specimens.
KW  - Thermal	barrier	coating	systems;	coating	removal;	refurbishment;	cyclic	oxidation;	failure	behaviors

DO  - 10.32604/icces.2023.010540