CuO、B2O3和Li2O共掺低温烧结BaTiO3陶瓷

成臣; 李蔚

doi:10.14135/j.cnki.1006-3080.20210301001

CuO、B₂O₃和Li₂O共掺低温烧结BaTiO₃陶瓷

doi: 10.14135/j.cnki.1006-3080.20210301001

成臣,
李蔚^,

华东理工大学材料科学与工程学院，上海 200237

详细信息

作者简介:
成臣：成　臣（1996-），男，江苏泰州人，硕士生，研究方向为钛酸钡陶瓷。E-mail：chengchenhx@163.com

通讯作者:
李　蔚，E-mail：liweiwei@ecust.edu.cn

中图分类号: TQ174.75
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- 被引次数: 0
出版历程
- 收稿日期: 2021-03-01
- 网络出版日期: 2021-06-16

Low Temperature Sintering of BaTiO₃ Ceramics via Co-Doping with CuO, B₂O₃ and Li₂O

CHENG Chen,
LI Wei^,

School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China

摘要

摘要: 将CuO、B₂O₃和Li₂O共掺，低温烧结制备了BaTiO₃陶瓷，探讨了随着烧结温度的提高，BaTiO₃陶瓷样品密度、物相组成和显微结构的变化。结果表明：CuO、B₂O₃和Li₂O共掺可有效降低BaTiO₃陶瓷的烧结温度；在950 ℃保温2 h可获得密度为5.75 g/cm³(相对密度为95.6%)的四方相的BaTiO₃陶瓷，但更高的烧结温度会使样品密度下降，当烧结温度为1100 ℃时样品密度仅为5.23 g/cm³(相对密度为86.9%)；所得BaTiO₃陶瓷的显微结构随着烧结温度的升高出现明显变化，晶粒迅速长大。0.7%CuO-1.5%B₂O₃-0.3%Li₂O（BCL）（0.7%、1.5%、0.3%为质量分数）共掺时产生的低共熔相和固溶反应是降低烧结温度的主要原因。
- BaTiO₃陶瓷 /
- CuO /
- B₂O₃ /
- Li₂O /
- 低温烧结
Abstract: Multilayer capacitors with BaTiO₃ as the core dielectric material was known as the most widely used and classic perovskite ferroelectrics. Due to the high sintering temperature of BaTiO₃ based ceramics, only noble metal materials could be used as internal electrodes. Therefore, it was of great practical significance to reduce the sintering temperature of BaTiO₃ based ceramics to match with the base metal electrode materials with lower melting point, so as to reduce the cost, which had been a research hotspot in this field at home and abroad. In order to reduce the sintering temperature of BaTiO₃ ceramics, many methods had been used, among which the simplest and most effective method was to add appropriate sintering additives. In this work, BaTiO₃ ceramics were sintered at low temperatures via co-doping with CuO, B₂O₃ and Li₂O. The phase composition, density and microstructure of the ceramics at different sintering temperatures had been investigated. The results showed that co-doping of CuO, B₂O₃ and Li₂O could effectively reduce the sintering temperature of BaTiO₃ ceramics. Single tetragonal phase BaTiO₃ ceramics with high density of 5.75 g/cm³ could be obtained after sintering at 950 ℃ for 2 h and the relative density was 95.6%, while higher sintering temperature led to the decrease of the density of the ceramics. The density of sample sintered at 1100 ℃ was only 5.23 g/cm³ and the relative density was 86.9%. Meanwhile, the microstructure of BaTiO₃ ceramics changed obviously with the increase of sintering temperature, and the grains grew rapidly. The low eutectic phase and solid solution reaction during 0.7%CuO-1.5%B₂O₃-0.3%Li₂O (BCL) co-doping were the main reasons for decreasing sintering temperature.
- BaTiO₃ ceramics /
- CuO /
- B₂O₃ /
- Li₂O /
- low temperature sintering

HTML全文

图 1 共掺BCL复合添加剂的BaTiO₃陶瓷样品在不同温度下烧结的密度变化曲线

Figure 1. Density curve of BaTiO₃ ceramics with BCL composite additives sintered at different temperatures

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图 2 共掺BCL复合添加剂的BaTiO₃陶瓷样品的XRD衍射图

Figure 2. XRD patterns of BaTiO₃ ceramics with BCL composite additives

a-1300 ℃；b-850 ℃；c-900 ℃；d-950 ℃；e-1000 ℃；f-1050 ℃；g-1100 ℃

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图 3 共掺BCL复合添加剂的BaTiO₃陶瓷样品在不同温度下烧结的SEM图

Figure 3. SEM images of BaTiO₃ ceramics with BCL composite additives sintered at different temperatures

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图 4 共掺BCL复合添加剂的BaTiO₃陶瓷样品在950 ℃的EDS能谱图

Figure 4. EDS of BaTiO₃ ceramics doped with BCL composite additives at 950 ℃

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