Investigation on the key factors in the hydrothermal synthesis of BN: The way of introducing sodium azide
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- 作者：Kai Li (1)
HaiHui Jiang (2) (3)
Gang Lian (2)
QiLong Wang (2)
Xian Zhao (1)
DeLiang Cui (1)
XuTang Tao (1) - 关键词：cubic boron nitride ; hydrothermal synthesis ; sodium azide
- 刊名：Chinese Science Bulletin
- 出版年：2007
- 出版时间：July 2007
- 年：2007
- 卷：52
- 期：13
- 页码：1785-1790
- 全文大小：3367KB
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HaiHui Jiang (2) (3)
Gang Lian (2)
QiLong Wang (2)
Xian Zhao (1)
DeLiang Cui (1)
XuTang Tao (1)
1. State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, China
2. School of Chemistry & Chemical Engineering, Shandong University, Jinan, 250100, China
3. Shandong Institute of Light Industry, Jinan, 250100, China - ISSN：1861-9541
文摘
The way of introducing sodium azide (NaN3) into the reaction solution played an important role in the preparation of cBN by hydrothermal synthesis method. The results showed that both cBN content and crystalline perfection of the samples improved with increasing R N value, and pure cBN could be obtained at 300°C and 10 MPa when R N increased to 3:1. Here R N is defined as R N = NaN3(I)/NaN3(II), where NaN3(I) denotes the amount of NaN3 (in molar) that is added into the autoclave at the beginning of the reaction process, and NaN3(II) is the amount of NaN3 (also in molar) introduced into the autoclave at high temperature and high pressure (i.e. 300°C and 10 MPa). In order to explain the experimental results, a preliminary model was proposed in this paper.