Morphological development and oxidation mechanisms of aluminum nitride whiskers

Journal Article · Thu Apr 15 00:00:00 EDT 2010 · Journal of Solid State Chemistry

OSTI ID:21372579

Xinmei, Hou; Changsheng, Yue ^[1]; Kumar Singh, Ankit ^[2]; Mei, Zhang ^[1]

---

1. Department of Physical Chemistry, University of Science and Technology, Beijing 100083 (China)
2. Department of Ceramic Engineering, Institute of Technology, Banaras Hindu University, Varanasi 221005 (India)

Hexagonal aluminum nitride (AlN) whiskers have been synthesized at 1873 K under a flowing nitrogen atmosphere. The synthesized whiskers are long straight filaments with diameters between 1 and 5 {mu}m and length in the cm range. In order to investigate its 'oxidation resistance', a series of experiments have been performed. The oxidation behavior was quite different in the experimental temperature range assigned, which can be attributed to the kinetic factor and the morphological development during oxidation process. It was chemical controlled at lower temperature while both chemical reaction and diffusion controlled at medium temperature. Further accelerating of temperature to 1473 K, AlN whiskers was peeled into smaller parts, which increased the oxidation rate and hence showed powder-like oxidation behavior. Our new kinetic theory has been applied to study the oxidation behavior of AlN whiskers. The comparison of the experimental data with the theoretical ones validates the applicability of the new model. - Hexagonal aluminum nitride (AlN) whiskers have been synthesized at 1873 K under a flowing nitrogen atmosphere. The synthesized whiskers are long straight filaments with diameters between 1 and 5 {mu}m and length in the cm range.

• OSTI ID: 21372579
• Journal Information: Journal of Solid State Chemistry, Vol. 183, Issue 4; Other Information: DOI: 10.1016/j.jssc.2010.02.022; PII: S0022-4596(10)00080-0; Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ALUMINIUM NITRIDES
DIFFUSION
FILAMENTS
HEXAGONAL LATTICES
OXIDATION
POWDERS
SYNTHESIS
TEMPERATURE RANGE 1000-4000 K
WHISKERS
ALUMINIUM COMPOUNDS
CHEMICAL REACTIONS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALS
MONOCRYSTALS
NITRIDES
NITROGEN COMPOUNDS
PNICTIDES
TEMPERATURE RANGE