Influence of Crack Healing on Mechanical Properties of SiC Fabric / SiC- Al2O3 Matrix Laminates |
| Journal |
Key Engineering Materials (Volume 352) |
| Volume |
Innovation in Ceramic Science and Engineering |
| Edited by |
Katsutoshi Komeya, Yohtaro Matsuo and Takashi Goto |
| Pages |
49-52 |
| DOI |
10.4028/www.scientific.net/KEM.352.49 |
| Online since |
August, 2007 |
| Authors |
Takashi Arima,
Yoshihiro Hirata,
Naoki Matsunaga,
Masaki Shibuya
|
| Keywords |
Crack-Healing, Mechanical Property, SiC Fabric, SiC-Al2O3 Laminate |
| Abstract |
SiC fabric including SiC (60 vol%)-Al2O3 (40 vol%) mixed powders and SiC (60
vol%)-Al2O3 (40 vol%) sheet of 60 μm thick were alternatively laminated and hot-pressed to 79 -
83 % of theoretical density under a pressure of 39 MPa in an Ar atmosphere at 1600 °C. Four cracks
were formed on the polished laminates with 30 ± 3 and 43 ± 2 vol% SiC fabric along the center line
perpendicular to the direction of length by Vickers indentor at the load of 98 N and healed in air at
1100 °C for 24 h. The strength (253 MPa) of the as-hot-pressed laminate without SiC fabric
decreased to 119 MPa after the introduction of the cracks but was recovered to 336 MPa after the
healing. The crack size decreased because of the oxidation of SiC particles during the healing.
However, the laminates with SiC fabric had a high damage tolerance and gave no change in the
strength (~100 MPa) after the introduction of the cracks. The SiC fabric prevented the propagation
of the cracks. After the healing, the porosity of the laminates decreased owing to the volume
increase during the oxidation of SiC particles and SiC fabric. The strength of the healed laminates
was comparable to that of as-hot-pressed laminates. |
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