Highly crystalline AIN particles synthesised by SHS method

resumo

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.

palavras-chave

HIGH-TEMPERATURE-SYNTHESIS; ALUMINUM NITRIDE; COMBUSTION SYNTHESIS; ALN POWDER; MICROSTRUCTURE; SI3N4

categoria

Materials Science

autores

Fu, RL; Chen, KX; Zhou, HP; Ferreira, JMF

nossos autores

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