闪烧合成高熵氧化物陶瓷(MgCoNiCuZn)O的性能

doi:10.15541/jim20220320

无机材料学报 ›› 2022, Vol. 37 ›› Issue (12): 1289-1294.DOI: 10.15541/jim20220320

闪烧合成高熵氧化物陶瓷(MgCoNiCuZn)O的性能

李汪国¹(), 刘佃光¹(), 王珂玮², 马百胜², 刘金铃³

1.西南交通大学材料科学与工程学院, 成都 610031
2.东莞理工学院机械工程学院, 东莞 523808
3.西南交通大学力学与航空航天学院, 成都 610031

收稿日期:2022-06-07 修回日期:2022-08-09 出版日期:2022-12-20 网络出版日期:2022-08-26
通讯作者: 刘佃光, 副教授. E-mail: dianguang@swjtu.edu.cn
作者简介:李汪国(1997-), 男, 硕士研究生. E-mail: 1648155341@qq.com
基金资助:
国家自然科学基金重点项目(51732009);中央高校基本科研业务费专项资金(2682022ZTPY076)

High Entropy Oxide Ceramics (MgCoNiCuZn)O: Flash Sintering Synthesis and Properties

LI Wangguo¹(), LIU Dianguang¹(), WANG Kewei², MA Baisheng², LIU Jinling³

1. School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
2. School of Mechanical Engineering, Dongguan University of Technology, Dongguan 523808, China
3. School of Mechanics and Aerospace Engineering, Southwest Jiaotong University, Chengdu 610031, China

Received:2022-06-07 Revised:2022-08-09 Published:2022-12-20 Online:2022-08-26
Contact: LIU Dianguang, associate professor. E-mail: dianguang@swjtu.edu.cn
About author:LI Wangguo (1997-), male, Master candidate. E-mail: 1648155341@qq.com
Supported by:
National Natural Science Foundation of China(51732009);Fundamental Research Funds for the Central Universities(2682022ZTPY076)

摘要/Abstract

摘要：

闪烧技术是一种温度场与电场耦合的烧结技术, 具有低温快速传质的特性, 在高熵陶瓷的合成上具有显著的优势。本研究通过闪烧法合成了相对致密的高熵氧化物陶瓷(MgCoNiCuZn)O, 并与传统烧结试样的性能进行了对比。在室温, 电场强度为50 V/cm, 电流密度为300 mA/mm²条件下闪烧, 物相转变的时间仅为10 s。闪烧试样最高相对密度为94%, 比传统烧结试样最高密度提高了22.8%。闪烧试样的最高硬度5.05 GPa, 比传统烧结试样高3.95 GPa。当频率<2 Hz时, 闪烧试样的介电常数比传统烧结试样高一个数量级。闪烧试样性能的提高, 一方面与临界电场加速传质, 提高材料致密度有关; 另一方面与临界电场引入额外的缺陷有关。

关键词: 高熵氧化物, 闪烧, 相变, 介电常数

Abstract:

Flash sintering is a sintering technology coupled with temperature field and electric field, with characteristics of rapid mass transfer at low temperature, showing significant advantages in the synthesis of high entropy ceramics. In this study, relatively dense high entropy oxide ceramic (MgCoNiCuZn)O was synthesized by flash sintering, which properties were compared with those of conventional sintered samples. Under flash sintering condition of room temperature, the electric field intensity of 50 V/cm and the current density of 300 mA/mm², the time of phase transformation is only 10 s. The maximum relative density of flash sintered sample is 94%, which is 22.8% higher than that of conventional sintered sample. The maximum hardness of flash sintered sample is 5.05 GPa, which is 3.95 GPa higher than that of conventional sintered sample. When the frequency is lower than 2 Hz, the dielectric constant of flash sintering sample is one order of magnitude higher than that of conventional sintered sample. The property improvement of flash sintered samples is attributed to the acceleration of mass transfer by the critical electric field to increase the material density, and the extra defects introduced by the critical electric field.

Key words: high entropy oxide ceramics, flash sintering, phase transformation, dielectric constant

中图分类号:

TQ174

李汪国, 刘佃光, 王珂玮, 马百胜, 刘金铃. 闪烧合成高熵氧化物陶瓷(MgCoNiCuZn)O的性能[J]. 无机材料学报, 2022, 37(12): 1289-1294.

LI Wangguo, LIU Dianguang, WANG Kewei, MA Baisheng, LIU Jinling. High Entropy Oxide Ceramics (MgCoNiCuZn)O: Flash Sintering Synthesis and Properties[J]. Journal of Inorganic Materials, 2022, 37(12): 1289-1294.

图/表 6

表1 闪烧和传统烧结的实验参数

Table 1 Experimental parameters of flash sintering and conventional sintering

Label	E/(V·cm^-1)	J/(mA·mm^-2)	T_f/℃	t	T_e/℃
F1	50	150	300	60 s	990
F2	50	200	300	60 s	1060
F3	50	250	300	60 s	1100
F4	50	300	300	60 s	1130
C1	-	-	990	2 h	-
C2	-	-	1060	2 h	-
C3	-	-	1100	2 h	-
C4	-	-	1130	2 h	-

图1 不同条件下的闪烧曲线、闪烧样品和传统烧结样品的XRD图谱以及闪烧样品保温阶段的照片

Fig. 1 Flash sintering curves, XRD patterns of samples and pictures of flash sintered sample in the stable stage Flash sintering curves (a) and XRD patterns at room temperature (b) of samples flash sintered at electric field strength of 50 V/cm, holding time of 60 s, and current densities of 100, 200 and 300 mA/mm2, respectively; Flash sintering curves (c) and XRD patterns at room temperature (d) of samples flash sintered at electric field strength of 50 V/cm, current density of 300 mA/mm2, holding time of 0, 10, 30, 60 s; (e) XRD patterns of conventional sintered samples C1-C4; (f) Photos of flash sintered samples in the stable stage; The holding time referrs to the time during the stable stage of flash sintering; Colorful figures are available on website

图2 在300 ℃保温60 s, 不同电流密度下闪烧试样的密度, 以及在对应温度下传统烧结试样的密度

Fig. 2 Densities of samples flash sintered at different current densities at 300 ℃ with holding time of 60 s, and of samples conventionally sintered at the corresponding temperatures

图3 不同电流密度闪烧样品以及相应温度传统烧结样品微观结构对比

Fig. 3 Comparison of microstructures of flash sintered samples with different current densities and conventional sintered samples at corresponding temperatures (a-e) Microstructures of flash sintered samples; (f-j) Microstructures of conventional sintered samples

图4 闪烧试样和传统烧结试样的硬度(a)及其硬度随气孔率的变化曲线(b)

Fig. 4 Hardness (a) and plot of hardness as a function of porosity(b) of flash sintered and conventional sintered samples

图5 不同电流密度下闪烧试样以及相应温度下传统烧结试样的介电常数的实部(a)与虚部(b)以及介电损耗(c)

Fig. 5 Real (a) and imaginary (b) parts of the dielectric constants, and tangent loss of flash sintered samples at different current densities and conventional sintered samples at the corresponding temperatures (c)

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闪烧合成高熵氧化物陶瓷(MgCoNiCuZn)O的性能

High Entropy Oxide Ceramics (MgCoNiCuZn)O: Flash Sintering Synthesis and Properties

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