Chapter 35. Development of β-Sl3N4 for Self-Reinforced Composites
- 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
Wittmer, D. E., Doshi, D. and Paulson, T. E. (1994) Development of β-Sl3N4 for Self-Reinforced Composites, 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.ch35
- Published Online: 26 MAR 2008
- Published Print: 1 JAN 1994
Print ISBN: 9780470375198
Online ISBN: 9780470313978
- thermal expansion coefficient;
β-Si3N4 seeds were prepared by doping commercial Si3N4 with the rare earth, Y2O3. Based on limited data, four-point flexural strength was found to be 925–1025 MPa for unseeded A2Y6–Si3N4 (Si, N, containing 2 wt.% AI2O3 and 6 wt.% Y2O3 as sintering aids) and 750–950 MPa for seeded A2Y6–Si3N4. Fracture toughness was found to be 8–10 MPa-m” for the unseeded S3N4 and 10–13 MPa-m1/2 for the seeded Si3N4. SEM results show that the seeded Si3N4 developed a more mature B-Si3N4 grain structure than the baseline composition. The processing methods employed, along with the physical properties and microstructures for composites produced using this seeding concept will be presented and discussed.