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首页> 外文期刊>Materials Letters >Preparation of carbon-free B_4C powder from B_2O_3 oxide by carbothermal reduction process
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Preparation of carbon-free B_4C powder from B_2O_3 oxide by carbothermal reduction process

机译:碳热还原法由B_2O_3氧化物制备无碳B_4C粉末

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摘要

To minimize free carbon residue in the boron carbide (B_4C) powder, a modified carbothermal reaction is performed where the starting material compositions are adjusted. Because of boron loss in the form of B_2O_2 gas during the carbothermal reaction of the stoichiometric starling composition, the final B_4C powders contain carbon residues. Thus, an excess B_2O_3 is used in the reaction to compensate the loss and to obtain stoichiometric powders. Parameters of the process for obtaining the carbon free B_4C powder by the carbothermal reduction have been determined using X-ray diffraction analysis and scanning electron microscopy. The synthesized B_4C powder using a carbon-deficient composition shows no trace of carbon with two types of grain morphologies.
机译:为了使碳化硼(B_4C)粉末中的游离碳残留量最小化,在调整起始原料组成的情况下进行了改性的碳热反应。由于在化学计量的starling组合物的碳热反应过程中,B_2O_2气体以硼的形式损失,最终的B_4C粉末含有碳残留物。因此,在反应中使用过量的B_2O_3以补偿损失并获得化学计量的粉末。已经通过X射线衍射分析和扫描电子显微镜确定了通过碳热还原获得无碳B_4C粉末的方法的参数。使用低碳成分合成的B_4C粉末没有痕量的碳,具有两种晶粒形态。

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