轮胎半焦制备碳化硅晶须的研究

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (3): 951-956.

轮胎半焦制备碳化硅晶须的研究

陆鹏飞^1,2, 许光文^1,2, 崔彦斌¹, 武荣成¹

1.中国科学院过程工程研究所多相复杂系统国家重点实验室,北京 100190;
2.沈阳化工大学机械与动力工程学院,沈阳 110142

收稿日期:2020-10-26 修回日期:2020-12-06 出版日期:2021-03-15 发布日期:2021-04-13
通讯作者: 武荣成,博士,副研究员。E-mail:rwu@home.ipe.ac.cn
作者简介:陆鹏飞(1995—),男,硕士研究生。主要从事能源与材料方面的研究。E-mail:1767811479@qq.com
基金资助:
国家自然科学基金(U1908201)

Preparation of Silicon Carbide Whiskers from Tire Semicoke

LU Pengfei^1,2, XU Guangwen^1,2, CUI Yanbin¹, WU Rongcheng¹

1. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
2. School of Mechanical and Power Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China

Received:2020-10-26 Revised:2020-12-06 Online:2021-03-15 Published:2021-04-13

摘要/Abstract

摘要： 以轮胎半焦和石英砂为原料,采用碳热还原法制备出碳化硅晶须。利用X射线衍射仪(XRD)和扫描电镜(SEM)对制得的产物进行物相组成和形貌分析,探究反应温度(1 300~1 500 ℃)、反应时间(120~300 min)、升温程序以及半焦粒度对合成碳化硅晶须的影响规律。结果表明:温度控制在1 350 ℃左右,且采用先升至1 500 ℃成核再降至1 350 ℃保温生长的加热方式时更有利晶须生长;原料粒度能够同时对碳化硅的生成和晶须的生长产生影响;随着半焦粒度的减小,碳化硅晶须的产量和质量均呈先升高后下降的趋势。在轮胎半焦粒度100~120目(150~120 μm)、反应温度1 350 ℃、反应时间240 min的最佳条件下,碳化硅产率为95.36%,制得的晶须直径为50~120 nm,长度为50~80 μm且分布均匀。

关键词: 轮胎半焦, 碳热还原反应, 碳化硅晶须, 升温程序, 生成机理

Abstract: Using tire semicoke and silica sand as raw materials, silicon carbide whiskers were prepared by the carbothermal reduction method. X-ray diffraction (XRD) and scanning electron microscope (SEM) were used to analyze the phase composition and morphology of the prepared product, and the influence laws of reaction temperature (1 300 ℃ to 1 500 ℃), reaction time (120 min to 300 min), heating procedure and semicoke particle size on the synthesis of silicon carbide whiskers were explored. The results show that the whisker growth is best when the temperature is controlled at about 1 350 ℃, and the heating method that first rises to 1 500 ℃ for nucleation and then drops to 1 350 ℃ for holding growth. The particle size of the raw material simultaneously affects the formation rate of silicon carbide. And the whisker as the semicoke particle size decreases, the yield and quality of silicon carbide whiskers increase first and then decrease. When the tire semicoke particle size is 100 mesh to 120 mesh (150 μm to 120 μm), the reaction temperature is 1 350 ℃, and the reaction time is 240 min, under the best conditions, the prepared whiskers have a diameter of 50 nm to 120 nm and a length of 50 μm to 80 μm, with uniform distribution and high yield 95.36%.

Key words: tire semicoke, carbothermal reduction, silicon carbide whisker, heating procedure, generation mechanism

中图分类号:

TB321

陆鹏飞, 许光文, 崔彦斌, 武荣成. 轮胎半焦制备碳化硅晶须的研究[J]. 硅酸盐通报, 2021, 40(3): 951-956.

LU Pengfei, XU Guangwen, CUI Yanbin, WU Rongcheng. Preparation of Silicon Carbide Whiskers from Tire Semicoke[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(3): 951-956.

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