摘要
Glass-like carbons （GCs） were prepared by carbonization of acetone-furfural resin in nitrogen atmosphere at 850℃, followed by heat treatment over a range of 1 200-2 500℃in inert atmosphere. The effect of heat treatment temperature （HTT） on the oxidation behavior was investigated by dynamic and isothermal thermogravimetric analyses. The structure of GC was examined by X-ray diffractometry （XRD） and the morphologies of GC before and after oxidation were examined by scanning electron microscopy （SEM）. It is shown that the GC samples present peculiar oxidation behavior. The anti-oxidation behavior increases with increasing the HTT to 1 600 ℃, whereas decreases gradually thereafter. GC sample heat treated at 1 600℃ obtains relatively optimal anti-oxidation properties under this condition. During the oxidation, this material produces grid network matrix surface and numerous nodular residues on the surface, resulting in excellent resistance to the attack of oxygen atoms.
选用糠酮树脂为前驱体,在氮气保护气氛下经850℃炭化制备出玻璃炭样品,随后在1200～2500℃温度范围内对样品进行高温热处理。采用动态热分析和等温热分析两种方法研究热处理温度对糠酮树脂基玻璃炭氧化性能的影响规律。采用X射线衍射(XRD)和扫描电镜(SEM)分别分析样品的晶体结构和表面形貌。结果表明:糠酮树脂基玻璃炭的氧化行为较为特别,随着热处理温度的升高,样品的抗氧化性能增强,但当热处理温度超过1600℃后,抗氧化性能开始下降,1600℃热处理后的样品的抗氧化性能最佳。该样品在氧化过程中表面形成网格状的基体和许多瘤节状残留物,这种特殊的氧化形貌有利于增强样品的抗氧化性能。
基金
Project (2006CB600902) supported by the National Basic Research Program of China
