Melting and spheroidization of hexagonal boron nitride in a microwave-powered, atmospheric pressure nitrogen plasma

IF 4.4 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Science Pub Date : 2002-08-01 DOI:10.1023/A:1016502804363

S. Gleiman, Chun-Ku Chen, A. Datye, J. Phillips

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引用次数: 26

Abstract

We have developed a method for producing spherically-shaped, hexagonal phase boron nitride (hBN) particles of controlled diameter in the 10–100 micron size range. Specifically, platelet-shaped hBN particles are passed as an aerosol through a microwave-generated, atmospheric pressure, nitrogen plasma. In the plasma, agglomerates formed by collisions between input hBN particles, melt and form spheres. We postulate that this unprecedented process takes place in the unique environment of a plasma containing a high N-atom concentration, because in such an environment the decomposition temperature can be raised above the melting temperature. Indeed, given the following relationship (V. L. Vinogradov and Kostanovskii, Teplofizika Vysokikh Temperatur 29 (1991) 1112): BN_(condensed) ? B_(gas) + N_(gas). Standard equilibrium thermodynamics indicate that the decomposition temperature of hBN is increased in the presence of high concentrations of N atoms. We postulate that in our plasma system the N atom concentration is high enough to raise the decomposition temperature above the (undetermined) melting temperature.

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六方氮化硼在微波驱动的常压氮等离子体中的熔化和球化

我们开发了一种生产直径在10-100微米范围内的球形六方相氮化硼(hBN)颗粒的方法。具体来说，血小板状的hBN粒子以气溶胶的形式通过微波产生的大气压力氮等离子体。在等离子体中，由输入的hBN粒子之间的碰撞形成的团块熔化并形成球体。我们假设这个前所未有的过程发生在含有高n原子浓度的等离子体的独特环境中，因为在这样的环境中分解温度可以提高到熔化温度以上。事实上，考虑到以下关系(V. L. Vinogradov和Kostanovskii, Teplofizika Vysokikh Temperatur29 (1991) 1112): BN(浓缩)?B(气体)+ N(气体)。标准平衡热力学表明，高浓度N原子的存在提高了hBN的分解温度。我们假设在我们的等离子体系统中，N原子浓度足够高，可以将分解温度提高到(未确定的)熔化温度以上。

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来源期刊

Journal of Materials Science 工程技术-材料科学：综合

CiteScore

7.90

自引率

4.40%

发文量

1297

审稿时长

2.4 months

期刊介绍： The Journal of Materials Science publishes reviews, full-length papers, and short Communications recording original research results on, or techniques for studying the relationship between structure, properties, and uses of materials. The subjects are seen from international and interdisciplinary perspectives covering areas including metals, ceramics, glasses, polymers, electrical materials, composite materials, fibers, nanostructured materials, nanocomposites, and biological and biomedical materials. The Journal of Materials Science is now firmly established as the leading source of primary communication for scientists investigating the structure and properties of all engineering materials.