Chapter 78. High-Temperature Mechanical Properties of Cr3+-Doped Sapphire Fibers

  1. Hua-Tay Lin and
  2. Mrityunjay Singh
  1. J. J. Quispe Cancapa1,
  2. A. R. De Arellano Löpez1 and
  3. A. Sayir2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294741.ch78

26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 23, Issue 3

26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 23, Issue 3

How to Cite

Cancapa, J. J. Q., De Arellano Löpez, A. R. and Sayir, A. (2002) High-Temperature Mechanical Properties of Cr3+-Doped Sapphire Fibers, in 26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 23, Issue 3 (eds H.-T. Lin and M. Singh), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294741.ch78

Author Information

  1. 1

    Dpto. de Física de la Materia Condensada, Universidad de Sevilla, Spain

  2. 2

    NASA Glenn Research Center and Case Western Reserve University, Cleveland, OH, USA

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2002

ISBN Information

Print ISBN: 9780470375785

Online ISBN: 9780470294741

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Keywords:

  • tensile;
  • scanning electron microscopy (SEM);
  • alumina;
  • mechanical properties;
  • fabrication

Summary

High-temperature slow-crack growth of c-axis single crystal 10 wt% Cr2O3 - Al2O3 (nominal composition) fibers has been studied by tensile rupture experiments at 1400d̀C, under different stressing rates (0.37 to 41.5 MPa.s-1). Slow-crack growth appears to be less pronounced with increasing Cr2O3. Rupture stresses increased with the stressing rate from 397 MPa to 515 MPa, resulting in a SCG exponent, N=19. The Cr2O3 composition was analyzed by Energy Dispersed X-Ray Spectra (EDS) and fracture surfaces were studied by scanning electron microscopy (SEM). Results are compared with previous studies on 100–300 ppm Cr3+ doped sapphire fibers and on commercial sapphire fibers.