Chapter 3. Synthesis of Composites In Situ Using Displacement Reactions
- John B. Wachtman Jr.
Published Online: 26 MAR 2008
Copyright © 1992 The American Ceramics Society
Proceedings of the 16th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 13, Issue 9/10
How to Cite
Henager, C. H., Brimhall, J. L. and Hirth, J. P. (1994) Synthesis of Composites In Situ Using Displacement Reactions, in Proceedings of the 16th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 13, Issue 9/10 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470313978.ch3
- Published Online: 26 MAR 2008
- Published Print: 1 JAN 1994
Print ISBN: 9780470375198
Online ISBN: 9780470313978
- analytical solutions
Solid state displacement reactions are being studied at Pacific Northwest Laboratory as a method of synthesizing intermetallic and ceramic composites in situ. A nanometer-scale interwoven composite was synthesized using a displacement reaction at 600 °C between thin, alternating-layers of Fe/NiO. A high-strength in situ composite of MoSi2/SiC was synthesized using a displacement reaction between Mo2C and Si by blending Mo2C and Si powders and vacuum hot-pressing the powders. The resulting microstructure consisted of 1-μm diameter SiC particles (30 vol%) uniformly dispersed in a fine-grained MoSi2 matrix. Bend bars and chevronnotched bars revealed a strength of 475 MPa and a fracture toughness of 6.7 MPa √m at room temperature. Bend strength increased to 515 MPa at 1000 °C and fracture toughness increased to 105 MPa√m at 1050 °C.