Effects of Impurities on Properties of YSZ Thermal Barrier Coatings

doi:10.15541/jim20200078

Abstract

Abstract:

Reducing low-melting impurity content in thermal barrier coatings (TBCs) can improve the high temperature stability and service life of coatings. But there is rare quantitative study on the relationship between the low-melting impurity content and coating properties. In the present work, the effect of SiO₂, Al₂O₃, and Fe₂O₃ impurities on the properties of Yttria-Stabilized Zirconia (YSZ) TBCs prepared by atmospheric plasma spraying was investigated. The samples were prepared with the contents of these impurities being increased gradually from less than 0.01wt% to 1.00wt%. The results demonstrated that those low-melting oxide impurities exhibit a significant effect on thermal conductivity and porosity of the coatings, playing a key role on thermal shock failure. The performance of coatings deteriorated especially significantly when the impurity oxide content is less than 0.2wt%.

Key words: thermal barrier coating, impurity, YSZ, thermal shock resistance, thermal conductivity

CLC Number:

TG174

JI Xiaojuan,YU Yueguang,LU Xiaoliang. Effects of Impurities on Properties of YSZ Thermal Barrier Coatings[J]. Journal of Inorganic Materials, 2020, 35(6): 669-674.

Figures/Tables 11

References 30

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ZrO₂	HfO₂	TiO₂	SiO₂	MgO	Fe₂O₃
90.28	1.55	<0.01	<0.01	<0.01	<0.01
Y₂O₃	Al₂O₃	CaO	Na₂O	K₂O
7.92	0.011	<0.01	<0.01	<0.01

ZrO₂	HfO₂	TiO₂	SiO₂	MgO	Fe₂O₃
90.28	1.55	<0.01	<0.01	<0.01	<0.01
Y₂O₃	Al₂O₃	CaO	Na₂O	K₂O
7.92	0.011	<0.01	<0.01	<0.01

No.	SiO₂		No.	Al₂O₃		No.	Fe₂O₃
No.	D	M	No.	D	M	No.	D	M
HP	<0.01	<0.01	—	<0.01	<0.01	—	<0.01	0.0049
S1	0.02	0.013	A1	0.02	0.014	F1	0.02	0.0140
S2	0.06	0.038	A2	0.06	0.030	F2	0.06	0.0390
S3	0.10	0.064	A3	0.10	0.051	F3	0.10	0.0800
S4	0.16	0.110	A4	0.15	0.079	F4	0.16	0.1100
S5	0.20	0.150	A5	0.20	0.120	F5	0.20	0.1400
S6	0.36	0.260	A6	0.35	0.230	F6	0.36	0.3000
S7	0.50	0.320	A7	0.50	0.300	F7	0.50	0.3400
S8	0.66	0.430	A8	0.65	0.380	F8	0.66	0.4600
S9	0.80	0.550	A9	0.80	0.450	F9	0.80	0.5700
S10	1.00	0.620	A10	1.00	0.640	F10	1.00	0.5900

No.	SiO₂		No.	Al₂O₃		No.	Fe₂O₃
No.	D	M	No.	D	M	No.	D	M
HP	<0.01	<0.01	—	<0.01	<0.01	—	<0.01	0.0049
S1	0.02	0.013	A1	0.02	0.014	F1	0.02	0.0140
S2	0.06	0.038	A2	0.06	0.030	F2	0.06	0.0390
S3	0.10	0.064	A3	0.10	0.051	F3	0.10	0.0800
S4	0.16	0.110	A4	0.15	0.079	F4	0.16	0.1100
S5	0.20	0.150	A5	0.20	0.120	F5	0.20	0.1400
S6	0.36	0.260	A6	0.35	0.230	F6	0.36	0.3000
S7	0.50	0.320	A7	0.50	0.300	F7	0.50	0.3400
S8	0.66	0.430	A8	0.65	0.380	F8	0.66	0.4600
S9	0.80	0.550	A9	0.80	0.450	F9	0.80	0.5700
S10	1.00	0.620	A10	1.00	0.640	F10	1.00	0.5900

Current/A	Voltage/V	Power/kW	Distance/mm
620	76	47	100
Ar/(L·min^-1)	H₂/(L·min^-1)	Ar(Carrier gas)/ (L·min^-1)	Powder feeding rate/(g·min^-1)
38	13	4.5	30