摘要
以硼酸和炭黑为初始原料,采用碳热还原法在氩气气氛下合成碳化硼(B_(4)C)粉体。研究了反应温度对B_(4)C粉体合成的影响。采用X射线衍射仪以及扫描电镜等手段对煅烧产物的物相组成和显微结构进行表征,并对合成机理进行初步探讨。结果表明:合成B_(4)C超细粉体的适宜条件为在1500~1550℃保温2h。在1500℃保温2h所制得的B_(4)C粉体主要由片状、短棒状等颗粒和近似球形颗粒组成(颗粒粒径尺寸在0.5~1.0μm之间),形成多样化的显微结构。在高温合成反应过程中,硼酸先分解为HBO_(2),HBO_(2)一部分与C发生反应生成B_(4)C,另一部分在高温下脱水分解为B_(2)O_(3),B_(2)O_(3)与C进一步发生反应转化为B_(4)C。
Boron carbide(B_(4)C)powder was synthesized using boric acid and carbon black as initial raw materials by carbon thermal reduction method under argon atmosphere.The effect of reaction temperature on the synthesis of B_(4)C powder was studied.The phase composition and microstructure of the calcined product were characterized using X-ray diffraction and scanning electron microscopy,and the synthesis mechanism was preliminarily explored.The results showed that the suitable conditions for synthesizing B_(4)C ultrafine powder were 2 hours of insulation at 1500~1550℃.The B_(4)C powder obtained by insulation for 2 hours at 1500℃was mainly composed of sheet-like,short rodshaped,and approximately spherical particles(with particle size between 0.5~1.0μm),forming a diverse microstructure.During the high-temperature synthesis reaction,boric acid first decomposes into HBO_(2).A portion of HBO_(2)reacts with C to form B_(4)C,while another portion dehydrates and decomposes into B 2 O3 at high temperatures.B_(2)O_(3)further reacts with C to convert into B_(4)C.
作者
曾婷
曹宇
胡继林
陈健颖
黄宇萱
陈占军
ZENG Ting;CAO Yu;HU Jilin;CHEN Jianying;HUANG Yuxuan;CHEN Zhanjun(Modern Industry School of Advanced Ceramics,Hunan Provincial Key Laboratory of Fine Ceramics and Powder Materials,School of Materials and Environmental Engineering,Hunan University of Humanities,Science and Technology,Loudi 417000,Hunan,China;School of Materials Science and Engineering,Jingdezhen Ceramic Institute,Jingdezhen 333403,Jiangxi,China)
出处
《四川化工》
2025年第4期1-4,共4页
Sichuan Chemical Industry
基金
湖南省重点研发计划项目(2021GK2015)
湖南省教育厅科学研究项目(23C0387)
湖南省自然科学基金项目(2025JJ70346)。
关键词
碳化硼
粉体
碳热还原法
合成
反应温度
机理
B_(4)C
powder
carbothermal reduction
synthesis
reaction temperature
mechanism
作者简介
通信作者:胡继林,博士、教授,主要研究方向为新型无机材料,邮箱:hujilin@126.com。
