Paper Title:
Critical Conditions for Crack-Healing of Structural Ceramics under Constant or Cyclic Stress
  Abstract

Mullite reinforced by SiC whiskers, Mullite(W), was developed with the aim of improving fracture toughness and to add crack-healing ability. For determining the threshold stress during crack-healing, a composite having a semi-elliptical surface crack of 100 μm was crack-healed at 1473 K for 8 h in air under elevated static and cyclic stresses and the bending strength at 1473 K of the crack-healed composite under stress were also investigated. Mullite(W) crack-healed under static stress below 100 MPa were never fractured during crack-healing and had the same bending strength as the specimens crack-healed under no-stress. Therefore, the threshold static stress during crack-healing of Mullite(W) has been determined to be 100 MPa. The threshold cyclic stress has also been determined to be 150 MPa. Considering that the crack growth is time-dependent, the threshold stress for all conditions during crack-healing of Mullite(W) has been concluded to be 100 MPa.

  Info
Periodical
Key Engineering Materials (Volumes 317-318)
Edited by
T. Ohji, T. Sekino and K. Niihara
Pages
461-464
DOI
10.4028/www.scientific.net/KEM.317-318.461
Citation
M. Ono, W. Nakao, K. Takahashi, K. Ando, "Critical Conditions for Crack-Healing of Structural Ceramics under Constant or Cyclic Stress", Key Engineering Materials, Vols. 317-318, pp. 461-464, 2006
Online since
August 2006
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Price
$32.00
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