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太西煤灰分对煤基碳化硅粉体合成的影响
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摘要
碳化硅(SiC)具有热稳定性高、导热性能好及机械强度高的特点,在陶瓷、金属复合材料、半导体材料及耐磨材料中有着广泛的应用。本课题采用碳热还原法制备纳米级碳化硅,分别以不同灰分的太西煤为碳源(7.1g),白炭黑为硅源(5.254g),Fe(NO_3)_3·9H_2O为催化剂(0.0998g),在氧化铝管式炉中,1600℃下,反应进行24小时后冷却至室温。并采用X射线衍射(XRD)、扫描式电子显微镜(SEM)、比表面积测定仪(BET),对所制备的样品进行表征。然后采用单因素变量法探究太西煤灰分对制备的碳化硅的物相、粒径、比表面积以及形貌的影响。实验表明,当碳源灰分分别为2.28%、6%以及20%时,均合成出了纯度较高的β-SiC。随着灰分的增加,碳化硅形貌由部分线状转化成颗粒状,并且由松散的骨架结构变为致密,颗粒尺寸也逐渐减小。
Silicon carbide(SiC) exihibits excellent mechanical strength,thermal stability and good thermal conductivity. Therefore,it has been widely used in the ceramic and abrasive industry. A simple and cost effective method was reported for the synthesis of silicon carbide by carbothermal reduction method, in which Taixi coal and Na_2SiO_3·9H_2O were respectively employed as carbon and silica precursors, Fe(NO_3)_3·9H_2O as the catalyst. The samples were characterized by XRD, SEM, BET.Results indicated that β-SiC was produced based on different Taixi Coal ash.the morphology were from nanowires and nanoparticles mixed sample with a incompact structure to single nanoparticles with compact structure.
引文
[1]李宝梅,王英勇,靳国强等.材料导报,2011,25(7):218.
    [2]Shen G Z,Bando Y,Ye C H,et al.Nanotechnology,2006,17(14):3468-3472.

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