Al2O3/BaZrO3双陶瓷界面微观组织演化及机理

doi:10.15541/jim20160554

无机材料学报 ›› 2017, Vol. 32 ›› Issue (8): 819-824.DOI: 10.15541/jim20160554

Al₂O₃/BaZrO₃双陶瓷界面微观组织演化及机理

张浩^{1, 2, 3}, 高鹏越^{1, 2, 3}, 陈光耀^{1, 2, 3}, 李明阳^{1, 2, 3}, 鲁雄刚^{1, 2, 3, 4}, 李重河^{1, 2, 3, 4}

(1. 上海大学省部共建高品质特殊钢冶金与制备国家重点实验室, 上海 200072; 2. 上海大学上海市钢铁冶金新技术开发应用重点实验室, 上海 200072; 3. 上海大学材料科学与工程学院, 上海 200072; 4. 上海特种铸造工程技术研究中心, 上海 201605)

收稿日期:2016-10-08 修回日期:2016-11-21 出版日期:2017-08-10 网络出版日期:2017-07-19
作者简介:张浩(1991–), 男, 硕士研究生. E-mail: zhanghao0829@i.shu.edu.cn
基金资助:
国家自然科学基金(51574164, 51374142);国家重点基础研究发展计划(973计划) (2014CB643403);上海市科委基础重点项目(14JC1491400)

Microstructure Evolution and Mechanism of Al₂O₃/BaZrO₃ Double Ceramics

ZHANG Hao^1,2,3, GAO Peng-Yue^1,2,3, CHEN Guang-Yao^1,2,3, LI Ming-Yang^1,2,3, LU Xiong-Gang^1,2,3,4, LI Chong-He^1,2,3,4

(1. State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200072, China; 2. Shanghai Key Laboratory of Advanced?Ferrometallurgy, Shanghai University, Shanghai 200072, China; 3. School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China; 4. Shanghai Special Casting engineering technology research center, Shanghai 201605, China)

Received:2016-10-08 Revised:2016-11-21 Published:2017-08-10 Online:2017-07-19
About author:ZHANG Hao. E-mail: zhanghao0829@i.shu.edu.cn
Supported by:
National Natural Science Foundation of China (51574164, 51374142);National Program on Key Basic Research Project (973 Program) (2014CB643403);Basic Major Research Program of Science and Technology Commission Foundation of Shanghai (14JC1491400)

摘要/Abstract

摘要：

以Al₂O₃为背层(硅溶胶为粘结剂), 电熔BaZrO₃作为面层材料(钇溶胶为粘结剂), 1550℃烧结后制成50 mm×25 mm×5 mm的Al₂O₃/BaZrO₃双陶瓷试样。通过光学显微镜(OM)、扫描电子显微镜(SEM)、X射线衍射仪(XRD)和EDS等手段观察了BaZrO₃层和Al₂O₃/BaZrO₃界面的显微结构, 研究了BaZrO₃与Al₂O₃的界面反应。结果表明, 面层由BaZrO₃基体和分布其上的大小10 μm左右的Y稳定的ZrO₂晶粒组成; Al₂O₃/BaZrO₃界面发生反应形成厚约300 μm的过渡层, 界面反应生成物有BaOAl₂O₃、ZrO₂和BaO·Al₂O₃·2SiO₂。界面从单纯的BaZrO₃/Al₂O₃双陶瓷结构演变为BaZrO₃、ZrO₂、BaO·Al₂O₃、BaO·Al₂O₃·2SiO₂和Al₂O₃等多种物相组成的复杂结构。反应过程中Al元素基本不迁移扩散, BaZrO₃中Ba元素向Al₂O₃所在的位置扩散形成BaO·Al₂O₃, 残留物形成一层条状ZrO₂, 而BaO·Al₂O₃·2SiO₂围绕着EC95(Al₂O₃+5%SiO₂)粉体颗粒周围生成。

关键词: Al₂O₃, BaZrO₃, 界面反应, 双陶瓷

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

中图分类号:

TB34

张浩, 高鹏越, 陈光耀, 李明阳, 鲁雄刚, 李重河. Al₂O₃/BaZrO₃双陶瓷界面微观组织演化及机理[J]. 无机材料学报, 2017, 32(8): 819-824.

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.

图/表 12

图1 Al2O3/BaZrO3双陶瓷样品焙烧升温曲线

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

图2 烧结后的Al2O3/BaZrO3双陶瓷试样形貌

Fig. 2 Al2O3/BaZrO3 double ceramics after sintering

表1 Al2O3/BaZrO3双陶瓷样品制作工艺

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

图 3 (a) BaZrO3粉料和(b)烧结后BaZrO3层的XRD图谱

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

图4 BaZrO3面层微观结构

Fig. 4 SEM micrograph showing microstructure of BaZrO3 coating

表2 BaZrO3层(图4 )A、B、C和D四点EDS分析结果

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

图5 Al2O3/BaZrO3界面微观形貌光学显微照片

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

图6 Al2O3/BaZrO3界面元素的面扫描分析结果

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

图7 Al2O3/BaZrO3界面反应层的XRD图谱

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

图8 (a) Al2O3/BaZrO3界面反应层微观形貌, (b)、(c)局部放大图

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

表3 Al2O3/BaZrO3界面反应层(图8中)A至F点EDS分析结果

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

图9 Al2O3/BaZrO3界面反应机理示意图

Fig. 9 Schematic illustration of Al2O3/BaZrO3 interfacial reaction

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Al₂O₃/BaZrO₃双陶瓷界面微观组织演化及机理

Microstructure Evolution and Mechanism of Al₂O₃/BaZrO₃ Double Ceramics

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