摘要
为了固化高放射性石墨,采用石墨粉模拟放射性核素^(14)C,以ZnO、Al_(2)O_(3)、SiO_(2)为原料,制备ZnO-Al_(2)O_(3)-SiO_(2)(ZAS)玻璃作为烧结助剂;以ZAS玻璃粉、Si、石墨粉为原料高温煅烧合成SiC-ZAS复相粉体颗粒的过程模拟固化高放射性石墨。借助高温光学显微镜、X射线衍射仪、电感耦合等离子发射光谱仪等分析仪器,研究ZAS玻璃的熔融特性与化学稳定性,以及SiC-ZAS复相粉体的合成。结果表明:配方为3.9Zn O·Al_(2)O_(3)·5.1SiO_(2)的ZAS玻璃的流动温度为1378℃,在pH为5~9的水溶液中浸泡28 d时,Si、Zn、Al的归一化浸出率分别为10^(-3)、10^(-5)、10^(-6)g/(m^(2)·d)数量级;合成SiC-ZAS复相粉体条件为1350℃真空煅烧3 h,硅碳物质的量之比为1.075。
To solidify high-radioactive graphite,using graphite powder to simulate radionuclide^(14)C.Using ZnO,Al_(2)O_(3)and SiO_(2)as raw materials,ZAS glass was prepared as sintering assistant.Using ZnO-Al_(2)O_(3)-SiO_(2)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·1Al_(2)O_(3)·5.1SiO_(2)is 1378℃,and the normalized leaching rates of Si,Zn and Al are 10^(-3),10^(-5)and 10^(-6)g/(m^(2)·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 1350℃for 3h in vacuum and the ratio of the amount of silicon to carbonis 1.075.
作者
曹雪
滕元成
王山林
王文
CAO Xue;TENG Yuancheng;WANG Shanlin;WANG Wen(College of Materials Science and Engineering,Southwest University of Science and Technology,Mianyang 621000,China)
出处
《中国粉体技术》
CAS
CSCD
2021年第3期89-96,共8页
China Powder Science and Technology
基金
国家自然科学基金项目,编号:11775182。
