OXIDATION OF TITANIUM DIBORIDE AND ZIRCONIUM DIBORIDE AT HIGH TEMPERATURES

被引：71

作者：

IRVING, RJ

WORSLEY, IG

机构：

[1] Chemistry Department, University of Surrey

来源：

JOURNAL OF THE LESS-COMMON METALS | 1968年 / 16卷 / 02期

关键词：

D O I：

10.1016/0022-5088(68)90067-2

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Powdered and compacted TiB2 have been heated in oxygen at pressures of 760-200 mm Hg. The TiB2-O2 reaction rate is parabolic except near 950 °C where it is cubic. The activation energy below 950 °C is 45 kcal/mole and above 950 °C is 31 kcal/mole. The ZrB2-O2 reaction rate is parabolic throughout the range 700 °-1050 °C and the activation energy is 28 kcal/mole. With both TiB2 and ZrB2 there is a minimum rate of reaction at about 600 mm pressure. The variation of oxidation rate with temperature and pressure is discussed in terms of a protective but volatile layer of B2O3. © 1968.

引用

页码：103 / &

共 4 条

[1] HIGH-TEMPERATURE OXIDATION .3. ZIRCONIUM AND HAFNIUM DIBORIDES [J].