scholarly journals Crack-healing behavior of Si_3N_4/SiC composite ceramics under cyclic stress and fatigue strength at healing temperature

2002 ◽  
Vol 2002 (0) ◽  
pp. 467-468
Author(s):  
Koji TAKAHASHI ◽  
Kotoji ANDO ◽  
Shin NAKAYAMA ◽  
Shinji SAITO
Keyword(s):  
Fatigue Strength ◽  
Cyclic Stress ◽  
Crack Healing ◽  
Composite Ceramics ◽  
Healing Temperature

Crack-Healing under Cyclic Stress and Improvement of the Resultant Fatigue Strength of Si3N4/SiC

2006 ◽  
Vol 317-318 ◽  
pp. 453-456
Author(s):  
Koji Takahashi ◽  
Kotoji Ando ◽  
Shinji Saito
Keyword(s):  
Fatigue Strength ◽  
Bending Strength ◽  
Base Material ◽  
Cyclic Stress ◽  
Static Fatigue ◽  
Crack Healing ◽  
Protective Oxide ◽  
Healing Temperature ◽  
Cracked Specimens ◽  
Surface Length

Si3N4/SiC composite ceramics were hot-pressed in order to investigate their crack-healing behavior under cyclic stress and the resultant static fatigue strength. Semi-elliptical surface cracks of 100 μm in surface length were made on each specimen. The pre-cracked specimens were crack-healed under a cyclic bending stress of 210MPa in air at 900, 1000, 1100, and 1200 °C. The bending strength and static fatigue strength of the crack-healed specimens were systematically investigated at each healing temperature. The specimens which has been crack-healed and static fatigue-tested at 900 and 1000 °C showed lower static fatigue strength than those tested at 1100 and 1200 °C. Detailed investigation on the fracture surface of static fatigue-tested specimens showed that oxidation of the base material had strong effects on the static fatigue strength. It was found that when the specimens were pre-oxidized in air at 1300 °C, the surface was covered by a protective oxide layer, leading to a significant improvement of static fatigue strength at 900 and 1000 °C.

Crack-Healing Behavior under Stress and Fatigue Strength at Elevated Temperature of Crack-Healed Si3N4/SiC Composite Ceramics

2001 ◽  
Vol 206-213 ◽  
pp. 819-822 ◽  
Author(s):  
Kotoji Ando ◽  
K. Houjyou ◽  
Min Cheol Chu ◽  
Kunimasa Takahashi ◽  
F. Yao ◽  
...  
Keyword(s):  
Elevated Temperature ◽  
Fatigue Strength ◽  
Crack Healing ◽  
Composite Ceramics

Strength Of Crack-healed Si_3N_4/SiC Composite Ceramics at Crack-healing Temperature

2000 ◽  
Vol 2000 (0) ◽  
pp. 499-500
Author(s):  
Sousuke SAKAMOTO ◽  
Sannshiro TAKESHITA ◽  
Kotoji ANDO ◽  
Min Cheol CHU ◽  
Shigemi SATO
Keyword(s):  
Crack Healing ◽  
Composite Ceramics ◽  
Healing Temperature

High Temperature Static Fatigue Properties and Crack Healing Temperature of Crack Healed Mullite/SiC Composite Ceramics

2000 ◽  
Vol 2000 (0) ◽  
pp. 497-498
Author(s):  
Kiichi TSUJI ◽  
Kotokaze HURUSAWA ◽  
Tuyosi HANAGATA ◽  
Kotoji ANDO ◽  
Shigemi SATO
Keyword(s):  
High Temperature ◽  
Fatigue Properties ◽  
Static Fatigue ◽  
Crack Healing ◽  
Composite Ceramics ◽  
Healing Temperature

Fatigue strength of Si_3N_4/SiC composite ceramics at healing temperature

2003 ◽  
Vol 2003.9 (0) ◽  
pp. 453-454
Author(s):  
Kotoji ANDO ◽  
Koji TAKAHASHI ◽  
Shoko YOSHIDA ◽  
Hisashi MURASE ◽  
Shinji SAITO
Keyword(s):  
Fatigue Strength ◽  
Composite Ceramics ◽  
Healing Temperature

CRACK-HEALING BEHAVIOR AND BENDING STRENGTH OF Al2O3/SiC COMPOSITE CERAMICS ACCORDING TO THE AMOUNT OF ADDITIVE Y2O3

2010 ◽  
Vol 24 (15n16) ◽  
pp. 2910-2915 ◽  
Author(s):  
KI WOO NAM
Keyword(s):  
High Temperature ◽  
Vickers Hardness ◽  
Bending Strength ◽  
Composite Ceramic ◽  
Crack Healing ◽  
Composite Ceramics ◽  
Strength Recovery ◽  
In Situ Observations ◽  
Healing Temperature

Three Al 2 O 3/ SiC composite ceramics were prepared, which included 1, 3 or 5 wt. % Y 2 O 3, and their high-temperature bending strengths and in-situ crack-healing behaviors examined. A surface elliptical-crack of about 100 µm in diameter was introduces on the specimens using a Vickers hardness indenter. From in-situ observations, the Al 2 O 3/ SiC composite ceramic with 3 wt.% Y 2 O 3 showed superior crack-healing ability than the 1 and 5 wt.% Y 2 O 3 ceramics. The as-cracked specimen with 3 wt.% Y 2 O 3 showed strength recovery on healing for 1 hr at 1473 K in air, which may have been due to the lower crack-healing temperature on the addition of 3 wt.% Y 2 O 3. The heat-resistance limit temperatures of the crack-healed Al 2 O 3/ SiC composite ceramics were 1073, 1373 and 873 K for 1, 3 and 5 wt.% Y 2 O 3, respectively.

scholarly journals Crack Healing Behavior with Healing Temperature in Si3N4/SiC Composite Ceramics

2005 ◽  
Vol 15 (12) ◽  
pp. 780-785
Author(s):  
Oh-Sung Song ◽  
Kotoji Ando ◽  
Koji Takahashi ◽  
Wataru Nakao ◽  
Ji-Ho Ryu
Keyword(s):  
Crack Healing ◽  
Composite Ceramics ◽  
Healing Temperature
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