Chapter 24. High Strength TiB2
- John B. Wachtman Jr.
Published Online: 26 MAR 2008
Copyright © 1990 The American Ceramic Society, Inc.
14th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 11, Issue 9/10
How to Cite
Torizuka, S., Habada, J. and Nishio, H. (1990) High Strength TiB2, in 14th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 11, Issue 9/10 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470313053.ch24
- Published Online: 26 MAR 2008
- Published Print: 1 JAN 1990
Print ISBN: 9780470374931
Online ISBN: 9780470313053
It was described in the previous paper that fully dense TiB2-20 wt% (2 mol% Y2O3-ZrO-) sintered bodies were fabricated by glass encapsulation HIP (1600°C, 200 MPa, 2 h), and their 3-pt. bending strength was as high as 1200 MPa. In this material, grain growth occurred during sintering; the grain sizes of TiB2 and ZrO2in a sintered (HIP'd) body were 4–6 μ and 2–5 μ, respectively, while starting powder sizes of TiB2 and ZrO2 were 2 μm and 0.1 μm, respectively. To minimize this grain growth, 2.5–5 wt% SiC, whose size was 0.2 μm, was added. As a restult, the grain sizes of TiB2 and ZrO2 in a sintered body were 2–4 μm and 1–3 μm, respectively. The 3-pt. bending strength has increased to 1280 MPa. In addition to improving strength, adding SiC improved the sinterability of TiB2-20 wt% (2 mol% Y2O3-ZrO2); the sintered body whose density was 98.0% of full density was fabricated by vacuum sintering (1600%dGC, 4 h).