Chapter 10. Reaction-Formed Processes for AlN/Al Ceramic Composites

  1. John B. Wachtman Jr.
  1. Dah-Wei Yuan,
  2. Vun-Shing Chengn,
  3. Ruey-Fong Yan and
  4. George Simkovich

Published Online: 28 MAR 2008

DOI: 10.1002/9780470314500.ch10

Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - A: Ceramic Engineering and Science Proceedings, Volume 15, Issue 4

Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - A: Ceramic Engineering and Science Proceedings, Volume 15, Issue 4

How to Cite

Yuan, D.-W., Chengn, V.-S., Yan, R.-F. and Simkovich, G. (1994) Reaction-Formed Processes for AlN/Al Ceramic Composites, in Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - A: Ceramic Engineering and Science Proceedings, Volume 15, Issue 4 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314500.ch10

Author Information

  1. Department of Materials Science and Engineering, Pennsylvania State University, University Park, PA, 16802

Publication History

  1. Published Online: 28 MAR 2008
  2. Published Print: 1 JAN 1994

ISBN Information

Print ISBN: 9780470375327

Online ISBN: 9780470314500

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Keywords:

  • modulus;
  • hardness;
  • well-established;
  • capillary rise;
  • contamination

Summary

AlN/Al ceramic matrix composites have been fabricated by directed nitridation of molten binary aluminum alloys in a nitrogen-containing atmosphere. A wide range of processing parameters was used, including variations in alloy composition, temperatures, and oxidant composition. It was observed that alkaline earth elements, such as Mg, Ca, Sr and Ba, can significantly promote the nitridation reaction of Al binary alloys. An Al-3Ca alloy possessed the highest growth rate of 29.7 × 10−5 g/cm2-sec and the lowest activation energy of 5.81 KJ/mole Al at 1200°C. In comparison, the activation energy of Al-4Ba and AI-4Sr alloys in pure N2 is 45.5 and 81.8 KJ/mole Al, respectively, between 900° and 1100°C. Density, Young's modulus, hardness and fracture toughness of the resulting composite materials were determined. Composites grown from Al-4% Ba alloys were found to exhibit high Young's modulus of 170.3 GPa and Vickers hardness of 5.66 GPa.