CHEN Jinpeng¹，SHU Xia¹，HONG Yong²，JIANG Fuqiang^1a，GONG Wenzhi^1a，ZHANG Yong¹，WU Yucheng¹

(1a. School of Materials Science and Engineering，1b. Key Laboratory of Advanced Functional Materials and Devices of Anhui Province，Hefei University of Technology，Hefei 230009，China；2. Anhui Special Equipment Inspection Institute，Hefei 230051，China)

Abstract:The magnetic powders were prepared by chemical coprecipitation method and modified by microencapsulation method,Eu2+ ion activated strontium aluminate as photoluminescence materials，to explore the sensitivity in the field of non-destructive testing (NDT). The powders were characterized and tested by SEM,TEM,XRD,VSM (hysteresis loop) and PL spectra. The results show that the phase of magnetic powders prepared by chemical coprecipitation method is Fe3O4,and the single particle size of it is about 10 nm,and the powders are spherical particle. The size range of the aggregates is between 70～600 nm and it belongs to the micron-level aggregation state. The fluorescence-modified magnetic powders can emit bright green fluorescence (approximately 514 nm) under near visible light excitation. The sensitivity of the modified fluorescent magnetic powders in practical microcracks detection is obviously better than that of ordinary magnetic powders.

Keywords: magnetic powder Fe3O4；fluorescent magnetic powders；non-destructive testing；photoluminescence

中图分类号：TB34                               文献标志码：A

文章编号：1008-5548(2020)01-0061-07

DOI:10.13732/j.issn.1008-5548.2020.01.010

收稿日期： 2019-05-20，修回日期：2019-06-14，在线出版时间：2019-07-25 16:15。

基金项目：国家质量监督检验检疫总局科技计划项目，编号：2017QK165；安徽省质量技术监督局科技支撑项目，编号：2018AHQT23；合肥工业大学与安徽省特种设备检测院院校企合作项目，编号：W2018JSKF0198。

第一作者简介：陈金鹏(1996—)，男，硕士研究生，研究方向为纳米功能材料与器件。E-mail：mickey.chen214@foxmail.com。

通信作者简介：舒霞(1971—)，女，博士，高级工程师，研究方向为纳米功能材料、材料电化学与分析检测。E-mail：xshu71@hfut.edu.cn。