Direct nitridation of molten Al(Mg,Si) alloy to AlN

authors	Haibo, J; Chen, K; Heping, Z; Agathopoulos, S; Fabrichnaya, O; Ferreira, JMF
nationality	International
journal	JOURNAL OF CRYSTAL GROWTH
author keywords	capillarity; crystal morphology; mass transfer; thermodynamics; growth from melt; alloys; nitrides
keywords	MAGNESIUM SILICON ALLOYS; ALUMINUM NITRIDE; AL2O3/METAL COMPOSITES; GROWTH MECHANISMS; OXIDATION; MORPHOLOGIES; WHISKERS; OXIDES
abstract	The growth of AIN rod-like crystals, successfully produced via direct nitridation of Al-alloy doped with 5 wt% Mg and 2 wt% Si at 1273 K is predominantly based on capillary niass-transfer phenomena, which occur through a network of micro-channels developed in the empty space among the AIN columnar crystals as well as the hollows inside these crystals. The diffusion of N-2 in the liquid alloy is the rate-determining step of the process. Mg and Mg3N, resulting after nitridation maintain a very low partial pressure of oxygen during the entire process and favour the formation of AIN. (c) 2005 Elsevier B.V. All rights reserved.
publisher	ELSEVIER SCIENCE BV
issn	0022-0248
year published	2005
volume	281
issue	2-4
beginning page	639
ending page	645
digital object identifier (doi)	10.1016/j.jcrysgro.2005.04.024
web of science category	Crystallography; Materials Science, Multidisciplinary; Physics, Applied
subject category	Crystallography; Materials Science; Physics
unique article identifier	WOS:000231011600062