MULLITE FORMATION IN KAOLINITE-ALPHA-ALUMINA

被引：73

作者：

LIU, KC ^{[1
]}

THOMAS, G ^{[1
]}

CABALLERO, A ^{[1
]}

MOYA, JS ^{[1
]}

DEAZA, S ^{[1
]}

机构：

[1] CSIC, INST CERAM & VIDRIO, DEPT CERAM, MADRID, SPAIN

来源：

ACTA METALLURGICA ET MATERIALIA | 1994年 / 42卷 / 02期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/0956-7151(94)90503-7

中图分类号：

T [工业技术];

学科分类号：

08 [工学];

摘要：

The primary and secondary mullite formation in high purity kaolinite-alpha-alumina have been studied by conventional processing, XRD, TEM, AEM, and optical microscopy. After 4 h firing at 1300 degrees C or below, only monosized primary mullite was formed in platy kaolinite, leaving alpha-alumina largely inert. Bimodal mullite crystals demonstrating secondary mullite nucleation and primary mullite growth were observed after 4 h firing at 1400 degrees C. At 1400 degrees C and above, the rapid kinetics of secondary mullite formation, the characteristics of the co-existing glassy phase and the microstructure, as well as the evidence of liquid phase sintering strongly support that solution-precipitation via a transitory liquid phase was the major mechanism for secondary mullite formation. Secondary mullite formation via inter-diffusion,though also observable, was considered as a minor route in the kaolinite-alpha-alumina reaction.

引用

页码：489 / 495

页数：7

共 18 条

[1]

STABLE AND METASTABLE EQUILIBRIA IN SYSTEM SIO2-AL2O3 [J].