烧结温度对导电木炭特性的影响

Effect of Sintering Temperature on the Characteristics of Conductive Wood Charcoal

以催化炭化工艺经高温烧结制备导电木炭,分析和探讨了烧结温度对木炭导电性能、微晶结构和石墨化度的影响.烧结温度从1,200,℃升高到1,500,℃时,导电木炭的电阻率降至0.052,3,.cm,且导电木炭中石墨状微晶排列由无规则排列逐渐转化为有序排列.导电木炭的拉曼光谱分析结果表明,烧结温度的升高有利于增加导电木炭的石墨状微晶的含量,提高其结晶程度和石墨化度.导电木炭的X射线衍射分析结果表明,在烧结温度升高的过程中,导电木炭晶面的层间距逐渐减小,向石墨化结构转变,当烧结温度升至1,500,℃时,导电木炭已部分石墨化.

The electrical resistivities, microcrystalline structure and graphitization degree of conductive wood charcoal was analyzed, in order to study the effect of sintering temperature on the characteristics of conductive wood charcoal. The results showed that when the sintering temperature increased from 1 200 ℃ to 1 500℃, the electrical resistivity of conductive wood charcoal was reduced to 0.052 3Ω· cm, and the graphite-like microcrystalline structure gradually transformed from the irregular arrangement into the regular one. Raman spectroscopy and X-ray diffrac- tion analysis implied that higher sintering temperature was beneficial to the increase of both the content of graphitelike microcrystalline and crystallinity and graphitization degree of conductive wood charcoal. In the process of high temperature sintering, the interlayer distance of microcrystalline plane decreased gradually and shifted to the structure of graphite with the increase of sintering temperature. When the sintering temperature increased to 1 500 ℃, the conductive wood charcoal was partly graphitized.