Microstructure Evolution and Mechanism of Al2O3/BaZrO3 Double Ceramics

doi:10.15541/jim20160554

Abstract

Abstract:

The Al₂O₃/BaZrO₃ double ceramics sample with size of 50 mm×25 mm×5 mm was prepared via sintering at 1550℃ by using Al₂O₃ as back layer (silica sol as binder), fused BaZrO₃as surface ceramics. The phase identification and crystal structure were determined by X-ray diffraction (XRD), while the microstructure and interfacial reaction were carried out by scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscope (EDS). SEM-EDS results show that the surface layer is mainly composed of BaZrO₃ matrix, with tiny yttria-stabilized zirconia grains (10 μm) uniformly distributed. The interface reaction between Al₂O₃and BaZrO₃, leads to form a 300 μm thick transition layer. Composed of BaAl₂O₄(BaO·Al₂O₃) and ZrO₂. Thus, the microstructure of interface transfers from a simple double ceramic Al₂O₃/BaZrO₃ interface into a complex structure, which is composed of BaZrO₃, ZrO₂, BaO·Al₂O₃, and Al₂O₃. During the reaction, the element Ba of BaZrO₃ migrates into the Al₂O₃ layer and forms BaO·Al₂O₃, then the residual becomes a strip-shaped ZrO₂ layer. The element Al of Al₂O₃ almost does not diffuse, and the ternary oxides BaO·Al₂O₃·2SiO₂ are formed around EC95(Al₂O₃+5%SiO₂) particles.

Key words: Al₂O₃, BaZrO₃, interfacial reaction, dual ceramic

CLC Number:

TB34

ZHANG Hao, GAO Peng-Yue, CHEN Guang-Yao, LI Ming-Yang, LU Xiong-Gang, LI Chong-He. Microstructure Evolution and Mechanism of Al₂O₃/BaZrO₃ Double Ceramics[J]. Journal of Inorganic Materials, 2017, 32(8): 819-824.

Figures/Tables 12

Fig. 1 Baking temperature curve of Al2O3/BaZrO3 double ceramics

Fig. 2 Al2O3/BaZrO3 double ceramics after sintering

Table 1 Preparation process of BaZrO3 coating on Al2O3

Layer No.	Size	Viscosity/s	Aggregate	Time/h	Humidity/%	Temperature/℃
1	50%, (74 μm)BaZrO₃ 50%, (45 μm)BaZrO₃	23	(180&150μm)BaZrO₃	24	65-75	21
2	(45 μm)EC95	19	(250μm)EC95	12
3-7	(45 μm)EC95	19	(700μm)EC95	12
8	(45 μm)EC95	19	/	12

Fig. 3 XRD patterns of BaZrO3 powders (a) and BaZrO3 coating after sintering (b)

Fig. 4 SEM micrograph showing microstructure of BaZrO3 coating

Table 2 EDS analysis results of face layer of BaZrO3 coating shown in Fig. 4

Element/at%	A	B	C	D
Ba	01.34	00.73	01.19	31.86
Zr	42.09	38.44	49.33	31.67
Y	22.76	20.55	24.82	02.17
O	33.82	40.28	24.66	34.30
Possible phases	YSZ	YSZ	YSZ	BaZrO₃

Fig. 5 Optical micrograph showing microstructure of Al2O3/BaZrO3 interface

Fig. 6 Element plan scan analyses of Al2O3/BaZrO3 interface

Fig. 7 XRD pattern of reaction layer of Al2O3/BaZrO3

Fig. 8 (a) SEM microstructure of interface and (b, c) detail with enlarged scale

Table 3 EDS analysis results of interface of BaZrO3-Al2O3 shown in Fig. 8

Element/at%	A	B	C	D	E	F
Al	26.43	29.36	65.84	43.54	0.49	0
Ba	18.30	16.86	6.56	31.84	0.51	48.30
Zr	0.37	0.34	0.64	0.80	69.93	34.52
Si	29.87	28.07	0.79	2.66	3.30	0
Y	0.54	0.63	0.07	0	2.29	0
O	24.49	24.75	26.11	21.16	23.48	17.19
Possible phases	BaAl₂Si₂O₈	BaAl₂Si₂O₈	Al₂O₃	BaAl₂O₄	ZrO₂	BaZrO₃

Fig. 9 Schematic illustration of Al2O3/BaZrO3 interfacial reaction

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Microstructure Evolution and Mechanism of Al₂O₃/BaZrO₃ Double Ceramics

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