Pekdemir Abdullah Devrim, Önal Müşerref, Sarikaya Yüksel
General Directorate of Mineral Research and Exploration, Ankara, Turkiye.
Department of Chemistry, Faculty of Science, Ankara University, Ankara, Turkiye.
Turk J Chem. 2023 Oct 12;47(6):1370-1379. doi: 10.55730/1300-0527.3620. eCollection 2023.
A weak acidic complex ester (CE) in solid form was prepared by a condensation reaction between very weak boric acid (BA: HBO) and (D)-mannitol (MA: CHO) by the molar ratio of BA/MA = 2. A boron carbide (BC) precursor was obtained from heating of the CE at 400 °C for 4 h. The precursor was pyrolyzed under argon flow in the interval of 1300-1550 °C for 4 h and at 1400 °C for 1-4 h, respectively. The materials were examined using several techniques such as X-ray diffraction analysis, thermal analysis, scanning electron microscopy, particle size distribution, and nitrogen adsorption/desorption. The optimum pyrolysis temperature and duration were 1400 °C and 4 h, respectively. The most crystalline BC particles were distributed between 1 and 100 μm with a mean particle size of 20 μm. The specific surface area and specific pore volume were 13.5 m g and 0.09 cm g, respectively. The size of the pores was between 2 and 36 nm with a mean size of 14 nm.
通过极弱酸硼酸（BA：HBO）与（D）-甘露醇（MA：CHO）以BA/MA = 2的摩尔比进行缩合反应，制备了固体形式的弱酸性复合酯（CE）。通过在400℃下加热CE 4小时获得碳化硼（BC）前驱体。该前驱体分别在氩气流中于1300-1550℃的区间内热解4小时以及在1400℃下热解1-4小时。使用多种技术对材料进行了检测，如X射线衍射分析、热分析、扫描电子显微镜、粒度分布和氮吸附/脱附。最佳热解温度和持续时间分别为1400℃和4小时。结晶度最高的BC颗粒分布在1至100μm之间，平均粒径为20μm。比表面积和比孔容分别为13.5 m²/g和0.09 cm³/g。孔尺寸在2至36nm之间，平均尺寸为14nm。
