Chapter 5. Microstructure and Properties of Platelet-Reinforced Ceramics Formed by the Directed Reaction of Zirconium with Boron Carbide

  1. John B. Wachtman Jr.
  1. T. D. Claar,
  2. W. B. Johnson,
  3. C. A. Andersson and
  4. G. H. Schiroky

Published Online: 26 MAR 2008

DOI: 10.1002/9780470310557.ch5

A Collection of Papers Presented at the 13th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 10, Issue 7/8

A Collection of Papers Presented at the 13th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 10, Issue 7/8

How to Cite

Claar, T. D., Johnson, W. B., Andersson, C. A. and Schiroky, G. H. (1989) Microstructure and Properties of Platelet-Reinforced Ceramics Formed by the Directed Reaction of Zirconium with Boron Carbide, in A Collection of Papers Presented at the 13th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 10, Issue 7/8 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470310557.ch5

Author Information

  1. Lanxide Corporation Tralee Industrial Park Newark, DE 19714-6077

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1989

ISBN Information

Print ISBN: 9780470374863

Online ISBN: 9780470310557

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Keywords:

  • chemical vapor infiltration;
  • zirconium diboride;
  • thermal expansion behavior;
  • thermal shock;
  • thermal conductivity

Summary

A new family of platelet-reinforced ceramics has been developed using a Lanxide DIMOX™ directed metal oxidation process. These materials consist of a metal carbide matrix reinforced with metal diboride platelets and a residual metal phase. Microstructure/property relationships are presented for the ZrB2/ZrCxZr system, which is formed by the directed reaction of molten zirconium with boron carbide. The metal content can be varied to tailor the mechanical, physical, and thermal properties. These platelet-reinforced ceramics exhibit an attractive combination of high strength (800–1030 MPa), high fracture toughness (11–23 MPa · m1/2), and high thermal conductivity (50–70 W/m · K). The effects of the platelet and metal phases on the toughness and fracture behavior are shown. Engineering properties are presented and discussed relative to potential applications.