Chapter 40. Processing and Mechanical Properties of Polycrystalline Y3Al5O12 (Yttrium Aluminum Garnet)

  1. John B. Wachtman Jr.
  1. K. Keller,
  2. T. Mah and
  3. T. A. Parthasarathy

Published Online: 26 MAR 2008

DOI: 10.1002/9780470313008.ch40

A Collection of Papers Presented at the 14th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 11, Issue 7/8

A Collection of Papers Presented at the 14th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 11, Issue 7/8

How to Cite

Keller, K., Mah, T. and Parthasarathy, T. A. (1990) Processing and Mechanical Properties of Polycrystalline Y3Al5O12 (Yttrium Aluminum Garnet), in A Collection of Papers Presented at the 14th Annual Conference on Composites and Advanced Ceramic Materials, Part 1 of 2: Ceramic Engineering and Science Proceedings, Volume 11, Issue 7/8 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470313008.ch40

Author Information

  1. Universal Energy Systems, Inc. Dayton, OH 45432

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1990

ISBN Information

Print ISBN: 9780470374924

Online ISBN: 9780470313008

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Keywords:

  • mechanical properties;
  • alkoxide method;
  • oxidative stability;
  • solubility;
  • mechanical properties

Summary

Polycrystalline Y3Al5O12 was fabricated using two different processing routes, sintering and hot-pressing; and the mechanical properties of the resulting material were evaluated. YAG powder was produced using a mixed alkoxide method. Bend bars of the sintered and hot-pressed samples were used in a 4-pt. bend test to obtain fracture strength and fracture toughness values. The hot-pressed YAG had a strength of 234 MPa at room temperature, while the sintered YAG had a strength of only 102 MPa. The strength of hot-pressed YAG was found to decrease sharply beyond 1400°C. The fracture toughness of the material was approximately 1.5 MPa · m1/2 at room temperature with a gradual drop to 1.3 MPa · m1/2 at 1400°C. The sintered YAG had a similar fracture toughness value of 1.2 MPa · m1/2.