Abstract
IN the course of an investigation into the stability of certain nitrides, whisker growth has been observed on aluminium nitride. Aluminium nitride powder was prepared from the elements, cold pressed at 15 tons/in.2 and sintered for 4 h at 1,750° C in high purity argon. The sintered compacts measured approximately 8 mm in diameter by 4 mm high. X-ray powder photographs of filings of the sintered nitride showed the structure to be hexagonal, close-packed (a near-wurtzite structure according to Jefferey and Parry1) with a = 3.11 Å and c = 4.98 Å. The sintered density was 68 per cent of theoretical and the Vickers micro-hardness 1,010 ± 15 kg mm−2.
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References
Jefferey, G. A., and Parry, G. S., J. Chem. and Phys., 23, 406 (1955).
Evans, P. E., and Wildsmith, G., Brit. J. App. Phys., 13, 68 (1962).
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EVANS, P., DAVIES, T. Aluminium Nitride Whiskers. Nature 197, 587 (1963). https://doi.org/10.1038/197587b0
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DOI: https://doi.org/10.1038/197587b0
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