Highly Crystalline AlN Particles Synthesised by SHS Method

Abstract

Abstract: Aluminium nitride (AlN) powders were prepared by self-propagating high-temperature synthesis (SHS). Aluminium
and AlN powder mixtures with weight ratios of about 60/40, in the presence of 3wt% NH₄F and 3wt% carbon powders were ignited in a
nitrogen atmosphere of 8 MPa, resulting in highly crystalline AlN particles with regular hexagonal morphology. The microstructure development during the
reaction and the influence of additives of NH₄F and carbon were determined by SEM/EDS and XRD analysis of the resulting products. For the samples with
NH₄F and carbon, the combustion temperature could be kept on a high level for longer times compared to the sample without NH₄F and carbon. This
indicates that an after-burning phenomenon has occurred; Carbon apparently enhances vapour transport through a mechanism that involves reduction and
then removal of the surface oxide layer of the particles during after-burning.

Key words: aluminium nitride, self-propagation high-temperature synthesis, highly crystalline microstructure, particles

CLC Number:

TB32
TQ174

FU Ren-Li,CHEN Ke-Xin,ZHOU He-Ping,Ferreira J. M. F. Highly Crystalline AlN Particles Synthesised by SHS Method[J]. Journal of Inorganic Materials.

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