Particle Formation by CO2 Laser-Induced Breakdown (II) Formation of B<SUB>4</SUB>C Fine Powder from Boron Bromide-Methane-Hydrogen System.

Toshiyuki OYAMA; Masayoshi KOBAYASHI; Tadahiro ISHII; Kazuo TAKEUCHI; Koichi KASUYA

doi:10.2184/lsj.21.3_387

Particle Formation by CO₂ Laser-Induced Breakdown (II)

Formation of B₄C Fine Powder from Boron Bromide-Methane-Hydrogen System.

Toshiyuki OYAMA, Masayoshi KOBAYASHI, Tadahiro ISHII, Kazuo TAKEUCHI, Koichi KASUYA

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Keywords: Fine particle, Gas breakdown, B₄C, Boron carbide, CO₂ laser

JOURNAL FREE ACCESS

1993 Volume 21 Issue 3 Pages 387-391

DOI https://doi.org/10.2184/lsj.21.3_387

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Abstract

Fine B₄C powder was synthesized by the TEA-CO₂ laser-induced dielectric gas breakdown of a BBr₃ + CH₄ + H₂ gas mixture. The product was characterized by SEM, ICP atomic emission spectroscopy, and electron and X-ray diffractions. The particles show a narrow size distribution with a mean particle size of 0.18 μm. The yield of particles was increased linearly with increasing laser pulse energy. About 90% of incident pulse energy was absorbed by plasma in the reactant gas.

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