Synthesis and characterisation of boron carbide whiskers and thin elongated platelets

被引：47

作者：

Carlsson, M ^{[1
]}

García-García, FJ ^{[1
]}

Johnsson, M ^{[1
]}

机构：

[1] Stockholm Univ, Dept Inorgan Chem, S-10691 Stockholm, Sweden

来源：

JOURNAL OF CRYSTAL GROWTH | 2002年 / 236卷 / 1-3期

关键词：

characterisation; crystal morphology; growth models;

D O I：

10.1016/S0022-0248(01)02272-2

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

Boron carbide whiskers and platelets have been synthesised via a carbothermal vapour-liquid solid (VLS) growth mechanism starting with B2O3 and carbon black as sources of boron and carbon, respectively. The reactions were studied in the temperature range 1200-1800degreesC. testing Co, Ni and Fe as catalyst metals. The best result was obtained at a synthesis temperature of 1700degreesC with a reaction mixture containing B2O3:C:NaCl:Co in the molar ratios of 1:6:0 25:0.1. The obtained boron carbide product exhibited different morphologies ranging From elongated platelets to whiskers with very high aspect ratio. Five different whisker-like crystal morphologies were found, and their growth directions and structural defects were characterised by means of transmission electron microscopy. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：466 / 476

页数：11

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