真空烧结制备(La0.2Nd0.2Sm0.2Gd0.2Er0.2)2Zr2O7高熵透明陶瓷

doi:10.15541/jim20200367

无机材料学报 ›› 2021, Vol. 36 ›› Issue (4): 418-424.DOI: 10.15541/jim20200367 CSTR: 32189.14.10.15541/jim20200367

真空烧结制备(La_0.2Nd_0.2Sm_0.2Gd_0.2Er_0.2)₂Zr₂O₇高熵透明陶瓷

曾建军¹(), 张魁宝¹^,²(), 陈代梦¹, 郭海燕¹, 邓婷¹, 刘奎¹

1.西南科技大学环境友好能源材料国家重点实验室, 绵阳 621010
2.西南科技大学核废物与环境安全国防重点学科实验室, 绵阳 621010

收稿日期:2020-07-02 修回日期:2020-09-18 出版日期:2021-04-20 网络出版日期:2020-10-30
通讯作者: 张魁宝, 研究员. E-mail: xiaobao320@163.com
作者简介:曾建军(1997-), 男, 硕士研究生. E-mail: zeng_jianjun@126.com
基金资助:
国家自然科学基金(51672228);环境友好能源材料国家重点实验室自主课题(西南科技大学)(18FKSY0214);环境友好能源材料国家重点实验室自主课题(西南科技大学)(20fksyII)

Preparation of (La_0.2Nd_0.2Sm_0.2Gd_0.2Er_0.2)₂Zr₂O₇ High-entropy Transparent Ceramics by Vacuum Sintering

ZENG Jianjun¹(), ZHANG Kuibao¹^,²(), CHEN Daimeng¹, GUO Haiyan¹, DENG Ting¹, LIU Kui¹

1. State Key Laboratory of Environment-friendly Energy Materials, Southwest University of Science and Technology, Mianyang 621010, China
2. Fundamental Science on Nuclear Wastes and Environmental Safety Laboratory, Southwest University of Science and Technology, Mianyang 621010, China

Received:2020-07-02 Revised:2020-09-18 Published:2021-04-20 Online:2020-10-30
Contact: ZHANG Kuibao, professor. E-mail: xiaobao320@163.com
About author:ZENG Jianjun(1997-), male, Master candidate. E-mail: zeng_jianjun@126.com
Supported by:
Natural Science Foundation of China(51672228);Project of State Key Laboratory of Environment-friendly Energy Materials(Southwest University of Science and Technology)(18FKSY0214);Project of State Key Laboratory of Environment-friendly Energy Materials(Southwest University of Science and Technology)(20fksyII)

摘要/Abstract

摘要：

高熵陶瓷是近年来陶瓷材料研究的热点, 制备性能优异的高熵陶瓷是陶瓷材料的发展趋势。本研究采用燃烧法结合真空烧结制备出高熵透明陶瓷。测试结果显示燃烧法制备高熵(La_0.2Nd_0.2Sm_0.2Gd_0.2Er_0.2)₂Zr₂O₇粉体的平均晶粒尺寸为8 nm, 高熵粉体为无序的缺陷萤石结构。在真空炉中不同温度烧结的高熵陶瓷具有有序的烧绿石结构。烧结温度对高熵透明陶瓷的在线透过率影响不大, 最大透过率为74%(@1730 nm), 其透过率光谱中出现大量吸收峰。随着烧结温度的升高, 陶瓷的体积密度有所上升, 晶粒尺寸增大, 而维氏硬度逐渐降低。

关键词: 高熵, 透明陶瓷, 烧绿石

Abstract:

High-entropy ceramic is a hot topic in the recent study of ceramic materials. High-entropy ceramics with excellent properties is the development trend of ceramic materials. In this research, high-entropy transparent ceramic was synthesized by combustion method combined with vacuum sintering. The result indicates that the mean grain size of high-entropy (La_0.2Nd_0.2Sm_0.2Gd_0.2Er_0.2)₂Zr₂O₇ powder is about 8 nm. And the high-entropy powder is disordered deficient fluorite structure. The final transparent ceramics sintered in vacuum furnace at different temperatures exhibit ordered pyrochlore structure. Sintering temperature has little effect on the transmittance of ceramics. And the in-line transmittance of as-prepared transparent ceramic can reach 74% at 1730 nm. There are many absorption peaks in the transmittance spectrum. With the increase of sintering temperature, the body density and grain size of ceramics increase, but the HV hardnesses decrease.

Key words: high-entropy, transparent ceramic, pyrochlore

中图分类号:

TQ174

曾建军, 张魁宝, 陈代梦, 郭海燕, 邓婷, 刘奎. 真空烧结制备(La_0.2Nd_0.2Sm_0.2Gd_0.2Er_0.2)₂Zr₂O₇高熵透明陶瓷[J]. 无机材料学报, 2021, 36(4): 418-424.

ZENG Jianjun, ZHANG Kuibao, CHEN Daimeng, GUO Haiyan, DENG Ting, LIU Kui. Preparation of (La_0.2Nd_0.2Sm_0.2Gd_0.2Er_0.2)₂Zr₂O₇ High-entropy Transparent Ceramics by Vacuum Sintering[J]. Journal of Inorganic Materials, 2021, 36(4): 418-424.

图/表 5

图1 煅烧的高熵粉体的TEM 照片

Fig. 1 TEM images of high-entropy powder after calcination

图2 煅烧粉体和不同温度烧结的高熵陶瓷的XRD图谱(a)和Raman图谱(b)

Fig. 2 XRD patterns (a) and Raman spectra (b) of calcined powder and high-entropy ceramics sintered at different temperatures

图3 高熵陶瓷的热腐蚀表面(a, d, g)和断面(b, e, h)的SEM照片及晶粒尺寸分布图(c, f, i)

Fig. 3 SEM images of final high-entropy ceramics after hot corrosion (a, d, g), SEM images of fractured final high-entropy ceramics (b, e, h), histograms of grain distribution (c, f, i) of final high-entropy ceramics

图4 不同温度烧结的高熵透明陶瓷的透过率光谱和照片

Fig. 4 Transmission spectra and photo of high-entropy transparent ceramics sintered at different temperatures

图5 不同温度烧结的高熵透明陶瓷的晶粒尺寸、维氏硬度和密度

Fig. 5 Grain sizes, Vickers hardnesses and bulk densities of high-entropy transparent ceramics sintered at different temperatures

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真空烧结制备(La_0.2Nd_0.2Sm_0.2Gd_0.2Er_0.2)₂Zr₂O₇高熵透明陶瓷

Preparation of (La_0.2Nd_0.2Sm_0.2Gd_0.2Er_0.2)₂Zr₂O₇ High-entropy Transparent Ceramics by Vacuum Sintering

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