为了提高碳纤维的体积电阻率,通过超声活化与过硫酸钠前处理,采用Stöber法在碳纤维表面直接生成二氧化硅包覆层。X射线光电子能谱结果显示,超声活化与过硫酸钠处理均使碳纤维表面活性提升,有助于二氧化硅包覆层的生长。通过红外光谱和扫描电子显微镜分析了SiO2包覆层的组成和形貌。热重分析表明,在850℃时CF/SiO2的质量损失不超过2%,耐热性良好。增重6.6%时,CF/SiO2的体积电阻率达到9.7×108Ω·cm,静电感度测试电压10kV下未发生电极放电现象,表明电阻提升有效。当CF/SiO2粉尘浓度600g/m3、点火能量为1.5J时,未发生粉尘燃烧和爆炸,具有良好的抗燃爆性。
In order to improve the volume resistivity of carbon fiber(CF),silica coating was directly formed on the surface of CF by Stöber method through ultrasonic activation and sodium persulfate pretreatment.XPS results shown that both ultrasonic activation and sodium persulfate treatment can enhance the surface activity of CF,which was conducive to the growth of silica(SiO2) coating.The composition and morphology of SiO2 coating were analyzed by FT-IR and SEM.Thermogravimetric analysis (TG) shown that the mass loss of CF/SiO2 was less than 2% at 850℃,and the heat resistance was good.The volume resistivity of CF/SiO2 reached 9.7×108Ω·cm when the weight was increased by 6.6%.The electrode discharge phenomenon did not occur under the test voltage of 10kV,which indicated that the resistance improvement was effective.When the CF/SiO2 dust concentration was 600g/m3 and the ignition energy was 1.5J,no dust combustion and explosion occurred,which indicated that the CF/SiO2 had good flame and explosion resistance.
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基金资助
国家自然科学基金(11872013)
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