A KINETIC-STUDY ON OXIDATION OF NIOBIUM CARBIDE

被引：29

作者：

SHIMADA, S

INAGAKI, M

机构：

[1] Department of Applied Chemistry, Faculty of Engineering, Hokkaido University, Sapporo

来源：

SOLID STATE IONICS | 1993年 / 63-5卷

关键词：

D O I：

10.1016/0167-2738(93)90122-J

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：

The isothermal oxidation of NbC powders was carried out at temperatures of 420-600-degrees-C and oxygen pressures of 4, 8 and 16 kPa, using an electro-microbalance. The oxidation process was divided into three steps I to III. In step I, oxidation occurs linearly in initial period (a degree of oxidation (alpha) < 10-20%). In step II (10% < alpha < 30%), oxidation proceeds by a diffusion-controlled process below 490-degrees-C, whereas oxidation was extremely accelerated by large heat evolution due to the crystallization of Nb2O5 formed above that temperature. A phase boundary-controlled process operates in step III (alpha > 30%).

引用

页码：312 / 317

页数：6

共 13 条

[1] THE MICROTOPOGRAPHY OF OXIDE FILMS ON NIOBIUM [J].