Self-aggregation Inducing High-ratio cBN Microcrystals Growth in Hydrothermal Solution

Chem. J. Chinese Universities ›› 2011, Vol. 32 ›› Issue (3): 655.

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Self-aggregation Inducing High-ratio cBN Microcrystals Growth in Hydrothermal Solution

ZHANG Xiao^1,2, LIAN Gang^1*, TAN Miao¹, ZHANG Shun-Jie^1,2, CUI De-Liang^1*, WANG Qi-Long²

1. State Key Laboratory of Crystal Materials,
2. School of Chemistry & Chemical Engineering, Shandong University, Jinan 250100, China

Received:2010-10-11 Revised:2010-11-22 Online:2011-03-10 Published:2011-02-23
Contact: LIAN Gang;CUI De-Liang E-mail:gang_lian2000@yahoo.com.cn
Supported by:
国家自然科学基金(批准号： 50672048, 50721002, 50990061)和山东省科技厅基金(批准号: 2008GG30003008)资助.

Abstract

Abstract: Hydrothermal method has been used to synthesize of cBN. However, it is found that BN samples prepared by this method are usually mixtures of cBN, hBN and other phases, which severely limits the applications of cBN. So, it is expected to exploit new methods by which cBN can be quickly separated from other impurity phases. In this paper, we report a method, developed by using the self-aggregation phenomenon of cBN crystallites, to prepare large cBN crystallites agglomerates under some specific hydrothermal conditions, and then to separate them from the other phases. The particle size and its uniformity of the agglomerates can be improved by increasing the reaction temperature and the concentration of reactants, and improving the uniformity of reaction solution has similar effect. In contrast, increasing the pressure of reaction solution leads to opposite trend. The possibilities of using this phenomenon to purify the cBN samples in practice and control the growth process of cBN crystallites have also been discussed. Besides, a simple model has been proposed to explain the mechanism of the self-aggregation phenomenon.

Key words: cubic boron nitride (cBN), self-aggregation, spontaneous purification, hydrothermal synthesis

CLC Number:

O613

TrendMD:

ZHANG Xiao1,2, LIAN Gang1*, TAN Miao1, ZHANG Shun-Jie1,2, CUI De-Liang1*, WANG Qi-Long2. Self-aggregation Inducing High-ratio cBN Microcrystals Growth in Hydrothermal Solution[J]. Chem. J. Chinese Universities, 2011, 32(3): 655.

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Self-aggregation Inducing High-ratio cBN Microcrystals Growth in Hydrothermal Solution

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