Influence of RE-Si-Al-O Glass Phase on Microstructure and CMAS Corrosion Resistance of High Entropy Rare Earth Disilicates

doi:10.15541/jim20240018

Abstract

Abstract:

Environmental barrier coating (EBC) is a key material for high power-to-weight ratio aero engine, which can provide effective protection for the hot end components of ceramic matrix composites, and prevent the erosion of gas and environmental corrosive media. At present, high entropy rare earth disilicates ((xRE_1/_x)₂Si₂O₇) are the most promising next-generation environmental barrier coatings. In order to enhance the CMAS corrosion resistance of high entropy rare earth disilicates, a novel high entropy (Y_0.25Yb_0.25Er_0.25Tm_0.25)₂Si₂O₇/RE-Si-Al-O (RE=Yb, Y, and La) multiphase ceramic was designed and prepared. The results show that the RE-Si-Al-O glass phase can not only wrap the ceramic grains, but also exist at the grain boundaries. Moreover, this multiphase ceramics can promote the growth of rare earth disilicate grains, reduce the number of grain boundaries, and decrease the number of diffusion channel of CMAS melt. As the radius of rare earth ion in the RE-Si-Al-O glass phase increases, the glass phase is more prone to react with Ca²⁺ ion in the CMAS melt, generating apatite, reducing the activity of the CMAS melt, inhibiting the erosion of high entropy rare earth disilicate grains by the CMAS molten salt, and thus improving the CMAS corrosion resistance of high entropy rare earth disilicates. After corrosion at 1500 ℃ for 48 h, there is still a residual CMAS layer on the surface of (Y_0.25Yb_0.25Er_0.25Tm_0.25)₂Si₂O₇/La-Si-Al-O multiphase ceramics, indicating that the multiphase ceramics have good resistance to CMAS corrosion. In conclusion, the microstructure design of this multiphase ceramic provides a new approach to improve the long-term application of EBC materials in high-temperature CMAS environments.

Key words: high entropy rare earth disilicate, CMAS corrosion, RE-Si-Al-O glass phase

CLC Number:

TQ174

LI Liuyuan, HUANG Kaiming, ZHAO Xiuyi, LIU Huichao, WANG Chao. Influence of RE-Si-Al-O Glass Phase on Microstructure and CMAS Corrosion Resistance of High Entropy Rare Earth Disilicates[J]. Journal of Inorganic Materials, 2024, 39(7): 793-802.

Figures/Tables 13

References 40

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Spot	Y	Yb	Er	Tm	Si	O	Matter
1	4.54	3.55	3.49	3.40	19.29	65.73	(4RE_0.25)₂Si₂O₇
2	4.42	4.31	5.48	4.09	18.99	62.71	(4RE_0.25)₂Si₂O₇
3	4.49	4.19	4.23	4.06	19.27	63.76	(4RE_0.25)₂Si₂O₇
4	5.18	5.69	5.48	5.30	21.41	56.94	(4RE_0.25)₂Si₂O₇
5	4.26	1.84	2.13	2.11	17.51	72.15	(4RE_0.25)₂Si₂O₇

Spot	Y	Yb	Er	Tm	Si	O	Matter
1	4.54	3.55	3.49	3.40	19.29	65.73	(4RE_0.25)₂Si₂O₇
2	4.42	4.31	5.48	4.09	18.99	62.71	(4RE_0.25)₂Si₂O₇
3	4.49	4.19	4.23	4.06	19.27	63.76	(4RE_0.25)₂Si₂O₇
4	5.18	5.69	5.48	5.30	21.41	56.94	(4RE_0.25)₂Si₂O₇
5	4.26	1.84	2.13	2.11	17.51	72.15	(4RE_0.25)₂Si₂O₇

Spot	Yb	Tm	Er	Y	Si	O	Ca	Mg	Al	La	Matter
1	0.76	0.69	0.71	0.69	22.15	57.64	9.43	0.99	6.94		CMAS
2	2.85	2.78	2.67	2.19	21.16	52.94	13.05		2.36		Ca₂RE₈(SiO₄)₆O₂
3	6.06	5.55	5.23	3.81	21.75	57.60					(4RE_0.25)₂Si₂O₇
4	1.91	1.89	2.02	1.24	23.55	58.21	11.18				CMAS
5	0.61	0.54	0.54	0.46	23.43	58.28	8.82	0.90	6.42		CMAS
6	2.02	1.82	1.84	0.82	24.39	57.84	11.27				Ca₂RE₈(SiO₄)₆O₂
7	5.54	5.11	5.36	3.77	22.74	57.48					(4RE_0.25)₂Si₂O₇
8	0.53	0.61	0.69	0.53	23.82	58.48	9.71		5.63		Yb-Si-Al-O-Ca
9	0.51	0.40	0.52	0.43	22.40	59.87	8.46	0.75	6.66		CMAS
10	1.79	1.90	1.98	0.95	23.72	58.85	10.81				Ca₂RE₈(SiO₄)₆O₂
11	5.98	4.92	4.89	3.56	21.68	58.97					(4RE_0.25)₂Si₂O₇
12	0.37	0.34	0.37	0.23	23.14	59.04	8.50	0.27	7.74		Y-Si-Al-O-Ca
13	0.76	0.71	0.68	0.69	24.75	55.79	9.23	1.01	6.22	0.16	CMAS
14	1.87	1.99	2.07	0.80	26.09	54.97	12.02			0.19	Ca₂RE₈(SiO₄)₆O₂
15	5.98	5.96	5.54	3.02	23.81	55.69					(4RE_0.25)₂Si₂O₇
16	0.22	0.35	0.45	0.21	26.26	57.49	7.13	0.28	6.32	1.29	La-Si-Al-O-Ca

Spot	Yb	Tm	Er	Y	Si	O	Ca	Mg	Al	La	Matter
1	0.76	0.69	0.71	0.69	22.15	57.64	9.43	0.99	6.94		CMAS
2	2.85	2.78	2.67	2.19	21.16	52.94	13.05		2.36		Ca₂RE₈(SiO₄)₆O₂
3	6.06	5.55	5.23	3.81	21.75	57.60					(4RE_0.25)₂Si₂O₇
4	1.91	1.89	2.02	1.24	23.55	58.21	11.18				CMAS
5	0.61	0.54	0.54	0.46	23.43	58.28	8.82	0.90	6.42		CMAS
6	2.02	1.82	1.84	0.82	24.39	57.84	11.27				Ca₂RE₈(SiO₄)₆O₂
7	5.54	5.11	5.36	3.77	22.74	57.48					(4RE_0.25)₂Si₂O₇
8	0.53	0.61	0.69	0.53	23.82	58.48	9.71		5.63		Yb-Si-Al-O-Ca
9	0.51	0.40	0.52	0.43	22.40	59.87	8.46	0.75	6.66		CMAS
10	1.79	1.90	1.98	0.95	23.72	58.85	10.81				Ca₂RE₈(SiO₄)₆O₂
11	5.98	4.92	4.89	3.56	21.68	58.97					(4RE_0.25)₂Si₂O₇
12	0.37	0.34	0.37	0.23	23.14	59.04	8.50	0.27	7.74		Y-Si-Al-O-Ca
13	0.76	0.71	0.68	0.69	24.75	55.79	9.23	1.01	6.22	0.16	CMAS
14	1.87	1.99	2.07	0.80	26.09	54.97	12.02			0.19	Ca₂RE₈(SiO₄)₆O₂
15	5.98	5.96	5.54	3.02	23.81	55.69					(4RE_0.25)₂Si₂O₇
16	0.22	0.35	0.45	0.21	26.26	57.49	7.13	0.28	6.32	1.29	La-Si-Al-O-Ca

Spot	Yb	Tm	Er	Y	Si	O	Ca	Mg	Al	Matter
1	1.39	1.12	1.03	0.84	22.26	54.21	14.35	0.39	4.41	CMAS
2	7.80	8.12	8.21	8.46	14.57	45.43	7.41			Ca₂RE₈(SiO₄)₆O₂
3	8.10	8.39	8.13	4.03	28.68	42.67				(4RE_0.25)₂Si₂O₇