Effect of Pre-crack Size and Crack-healing Temperature on Fatigue Strength of Mullite/SiC Ceramics(Ceramics & Rocks 2)

2001 ◽  
Vol 1.01.203 (0) ◽  
pp. 529-534
Author(s):  
Kotoji ANDO ◽  
Kotokaze FURUSAWA ◽  
Min Cheol CHU ◽  
Tsuyoshi HANAGATA ◽  
Kiichi TSUJI ◽  
...  
Keyword(s):  
Fatigue Strength ◽  
Crack Size ◽  
Crack Healing ◽  
Sic Ceramics ◽  
Healing Temperature

Crack-healing behavior and static fatigue strength of Si3N4/SiC ceramics held under stress at temperature (800, 900, 1000 °C)

2003 ◽  
Vol 23 (11) ◽  
pp. 1971-1978 ◽  
Author(s):  
Koji Takahashi ◽  
Byung-Soo Kim ◽  
Min-Cheol Chu ◽  
Shigemi Sato ◽  
Kotoji Ando
Keyword(s):  
Fatigue Strength ◽  
Static Fatigue ◽  
Crack Healing ◽  
Sic Ceramics

CRACK-HEALING BEHAVIOR AND BENDING STRENGTH PROPERTIES OF SiC CERAMICS BASED ON THE TYPE OF ADDITIVE SiO2 EMPLOYED

2010 ◽  
Vol 24 (15n16) ◽  
pp. 2869-2874 ◽  
Author(s):  
KI WOO NAM ◽  
JONG SOON KIM ◽  
SEUNG WON PARK
Keyword(s):  
Fracture Toughness ◽  
Silicon Carbide ◽  
Surface Crack ◽  
Bending Strength ◽  
Crack Size ◽  
Strength Properties ◽  
Crack Healing ◽  
Sic Ceramics ◽  
Maximum Crack ◽  
Atmospheric Level

Silicon carbide ( SiC ) exhibits good strength at high temperatures and resistance to radioactivity. However, it has poor fracture toughness. The ability to heal cracks represents a very desirable means of overcoming this weakness. This study focuses on the crack-healing behavior and bending strength of SiC ceramics to which sintering additives have been added. Optimized crack-healing condition was found to be 1hr at an atmospheric level of 1100 °C. The maximum crack size that can be healed at the optimized condition was a semi-elliptical surface crack of 450 µm in diameter. Si oxide was revealed to be the principle material involved in crack-healing.

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 of Si3N4/SiC ceramics under stress and fatigue strength at the temperature of healing (1000 °C)

2002 ◽  
Vol 22 (8) ◽  
pp. 1339-1346 ◽  
Author(s):  
K. Ando ◽  
K. Houjyou ◽  
M.C. Chu ◽  
S. Takeshita ◽  
K. Takahashi ◽  
...  
Keyword(s):  
Fatigue Strength ◽  
Crack Healing ◽  
Sic Ceramics

P59 Crack-healing behavior of Mullite/SiC multi-composite under stress and the resultant fatigue strength at the healing temperature

2006 ◽  
Vol 2006 (0) ◽  
pp. 637-638
Author(s):  
Yoshitaka KIMURA ◽  
Kenichi UCHIIDE ◽  
Wataru NAKAO ◽  
Koji TAKAHASHI ◽  
Kotoji ANDO
Keyword(s):  
Fatigue Strength ◽  
Crack Healing ◽  
Healing Temperature

Effect of Crack-Healing Process on Fatigue Strength of Si3N4/SiC Ceramics at 1000°C

2003 ◽  
Vol 247 ◽  
pp. 271-274
Author(s):  
Keiji Hojo ◽  
Kotoji Ando ◽  
Min Cheol Chu ◽  
Sigemi Sato
Keyword(s):  
Fatigue Strength ◽  
Healing Process ◽  
Crack Healing ◽  
Sic Ceramics

Threshold Stress for Crack-Healing of Si3N4/SiC and Resultant Cyclic Fatigue Strength at the Healing Temperature

2005 ◽  
Vol 88 (3) ◽  
pp. 645-651 ◽  
Author(s):  
Koji Takahashi ◽  
Kotoji Ando ◽  
Hisashi Murase ◽  
Shin Nakayama ◽  
Shinji Saito
Keyword(s):  
Fatigue Strength ◽  
Threshold Stress ◽  
Cyclic Fatigue ◽  
Crack Healing ◽  
Healing Temperature

Threshold Stress for Crack Healing of Mullite Reinforced by SiC Whiskers and SiC Particles and Resultant Fatigue Strength at the Healing Temperature

2007 ◽  
Vol 90 (7) ◽  
pp. 2159-2164 ◽  
Author(s):  
Koji Takahashi ◽  
Kenichi Uchiide ◽  
Yoshitaka Kimura ◽  
Wataru Nakao ◽  
Kotoji Ando ◽  
...  
Keyword(s):  
Fatigue Strength ◽  
Threshold Stress ◽  
Crack Healing ◽  
Sic Particles ◽  
Sic Whiskers ◽  
Healing Temperature
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