利用电磁感应合成法快速合成精细碳化硼粉末

Powders Pub Date : 2024-01-08 DOI:10.3390/powders3010002
A. Gubarevich, Katsumi Yoshida
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引用次数: 0

摘要

碳化硼(B4C)粉末具有明确的化学计量、高结晶度、最低的杂质含量和精细的粒度,这对于在先进的高科技应用中实现这种化合物的优异性能至关重要。然而,使用传统的合成方法(依赖于长时间的高温过程)来实现所需的化学计量和粒度是非常具有挑战性的。本研究的主要目的是采用一种快速、节能的方法合成具有高结晶度和亚微米级粒度的 B4C 细粉。B4C 粉末是在高频感应加热炉中利用电磁感应合成法(EMIS)从元素硼和碳合成的。通过非接触加热实现的快速加热速率促进了硼和碳之间放热化学反应的点燃和传播。此外,电磁效应加速了原子扩散,使反应在极短的时间内完成。B4C 的晶粒大小和结晶度可通过调整各种工艺参数(包括点火后的保温温度和加热持续时间)进行微调。因此,可在 10 分钟内合成出细小的 B4C 粉末。此外,这些合成的 B4C 粉末在暴露于空气时的氧化起始温度高于 500 ℃。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Fast Synthesis of Fine Boron Carbide Powders Using Electromagnetic Induction Synthesis Method
Boron carbide (B4C) powders with defined stoichiometry, high crystallinity, minimal impurity content, and a fine particle size are imperative for realizing the exceptional properties of this compound in advanced high-technology applications. Nevertheless, achieving the desired stoichiometry and particle size using traditional synthesis methods, which rely on prolonged high-temperature processes, can be challenging. The primary objective of this study is to synthesize fine B4C powders characterized by high crystallinity and a sub-micron particle size, employing a fast and energy-efficient method. B4C powders are synthesized from elemental boron and carbon in a high-frequency induction heating furnace using the electromagnetic induction synthesis (EMIS) method. The rapid heating rate achieved through contactless heating promotes the ignition and propagation of the exothermic chemical reaction between boron and carbon. Additionally, electromagnetic effects accelerate atomic diffusion, allowing the reaction to be completed in an exceptionally short timeframe. The grain size and crystallinity of B4C can be finely tuned by adjusting various process parameters, including the post-ignition holding temperature and the duration of heating. As a result, fine B4C powders can be synthesized in under 10 min. Moreover, these synthesized B4C powders exhibit oxidation onset temperatures higher than 500 °C when exposed to air.
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