Journal of Inorganic Materials

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Highly Crystalline AlN Particles Synthesised by SHS Method

FU Ren-Li1; CHEN Ke-Xin2; ZHOU He-Ping2; Ferreira J. M. F3   

  1. 1.College of Materials Science and Engineering; Nanjing University of Aeronautics and Astronautics; Nanjing 210016; China; 2.The State Key Laboratory of New Ceramics and Fine Processing; Tsinghua University; Beijing 100084, China; 3.Department of Ceramics and Glass Engineering; University of Aveiro; CICECO; 3810-193; Aveiro; Portugal
  • Received:2003-10-29 Revised:2003-12-30 Published:2004-11-20 Online:2004-11-20
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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

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