CAO Xue, TENG Yuancheng, WANG Shanlin, WANG Wen

(College of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621000, China)

Abstract: To solidify high-radioactive graphite, using graphite powder to simulate radionuclide 14C. Using ZnO, Al2O3 and SiO2 as raw materials, ZAS glass was prepared as sintering assistant. Using ZnO-Al2O3-SiO2 glass powder, Si and graphite powder as raw materials, the process of synthesis SiC-ZAS composite powder particles was simulated to solidify high radioactive graphite. By virtue of high-temperature microscope, X-ray diffraction, inductive coupled plasma emission spectrometer and other analytical instrument, the melting characteristics and chemical stability of ZAS glass as well as the synthesis of SiC-ZAS composite powders were studied. The results show that the flow temperature of the ZAS glass with a formula of 3.9 ZnO·1Al2O3·5.1SiO2 is 1 378 ℃, and the normalized leaching rates of Si, Zn and Al are 10-3, 10-5 and 10-6 g/(m2·d), respectively, when the ZAS glass immersed in an aqueous solution with a pH of 5～9 for 28 days. The synthesis of SiC-ZAS composite powder is calcined at 1 350 ℃ for 3h in vacuum and the ratio of the amount of silicon to carbonis 1.075.

Keywords: SiC-ZAS; composite powder; simulate; immobilize; high-radioactive graphite

中图分类号：TQ174.4

文献标志码：A

文章编号：1008-5548(2021)03-0089-08

DOI:10.13732/j.issn.1008-5548.2021.03.012

收稿日期： 2020-08-01，修回日期：2020-12-15，在线出版时间：2021-04-07 13:01。

基金项目：国家自然科学基金项目，编号：11775182。

第一作者简介：曹雪(1994—)，女，硕士研究生，研究方向为功能陶瓷。E-mail：2805966857@qq.com。

通信作者简介：滕元成(1967—)，男，硕士，教授，硕士生导师，研究方向为功能陶瓷。E-mail：tyc239@163.com。