摘要
以核桃壳作原料,利用控温炭化得到了保留材料生物学特征结构的多孔炭（WSC）,采用TGA、XRD、SEM、BET等测试手段对所得材料的炭化过程、微观结构、组成以及氧化机理进行了系统研究。结果表明：材料中存在丰富的相互连通的孔及孔隙,断口孔隙率为31.46%,孔隙直径约为0.5-1 m,比表面积为380m^2/g左右;碳主要以非晶形式存在,随炭化温度升高,非晶碳中类石墨的002峰增强,晶面间距减少,结构逐渐向理想石墨转变,同时密度增加,气孔率和比表面积下降;材料的非等温氧化速率先升高后降低,这是由于组成炭材料的烯片层结构中活性碳原子数量随氧化反应的进行发生变化所致。
A biomorphic carbon material which retained its anatomical features was prepared by carbonizing walnut shell at controlled heating rates.Microstructure,components,specific surface area,oxidation mechanism of WSC were analyzed by SEM,XRD,TGA and so on.Experimental results show that WSC has abundant interconnected pores and pore spaces,whose diameter is about 0.5 to 1 μm and the specific surface is 380m^2.g-1.It is a typical non-graphitizable carbon.With the increasing of carbonization temperature,the（002） peak became stronger,the interplanar spacing decreased,and the structure of WSC slowly evolved toward that of ideal graphite.The non-isothermal oxidation rate of WSC firstly increased and then decreased with the increasing of temperature,which may result from the variational quantity of activited carbon.
出处
《陶瓷学报》
CAS
北大核心
2010年第3期463-467,共5页
Journal of Ceramics
关键词
生物形态多孔炭
微观结构
非等温氧化
biomorphic porous carbon
micorstructure
non-isothermal oxidation
