THERMODYNAMIC ANALYSIS OF THE REFINING OF TECHNICAL BORON-NITRIDE

被引:10
作者
LEITNER, J [1 ]
VONKA, P [1 ]
BROZEK, V [1 ]
HUBACEK, M [1 ]
机构
[1] INST IRON & STEELMAKING, CS-26718 KARLSTEJN, CZECHOSLOVAKIA
关键词
Thermodynamics;
D O I
10.1007/BF00540500
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The efficiency of the process of refining technical boron nitride was assessed based on calculations of the chemical equilibrium in the B-N-O-C-Cl-H system. Three refining mixtures, CCl4+H2, CCl4+NH3 and CHCl3+NH3, were considered. The analysis indicates that the use of ammonia-containing mixtures is more convenient, a lower residual oxygen content, lower contamination of the product by carbon and a better overall boron balance emerging. The calculations of the equilibrium composition of the solid phase enabled suitable technological conditions of the refining process (temperature and starting composition of the gaseous phase) to be established. The calculated results are compared with experimental data, and some differences are discussed.
引用
收藏
页码:3594 / 3599
页数:6
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