Crack healing behaviour and high-temperature strength of mullite/SiC composite ceramics

Abstract Mechanical properties of sintered mullite/SiC ceramics related to its significant crack healing behavior are discussed in this paper. This investigation was made on four kinds of specimens such as as-received smooth, heat treated smooth, pre-cracked and pre-crack healed. Pre-crack sizes were 100 and 200 μm and they were semi-elliptical in shape. The main conclusions were obtained as follows: (a) mullite/SiC composite ceramic has ability to heal crack, (b) the best healing condition was found to be 1300 °C in air for 1 h, (c) maximum crack size able to be healed is semi-elliptical crack of 200 μm in diameter, (d) crack-healed zone has enough strength up to 1200 °C and most specimens failed outside the crack-healed zone.

[1]  Sung R. Choi,et al.  Crack healing behavior of hot pressed silicon nitride due to oxidation , 1992 .

[2]  Shigemi Sato,et al.  The Study on Crack Healing Behaviour of Silicon Nitride Ceramics. , 1998 .

[3]  Kotoji Ando,et al.  Fatigue strength of crack‐healed Si3N4/SiC composite ceramics , 1999 .

[4]  繁美 佐藤,et al.  炭化物粒子分散によるムライトの高強度化に関する研究 : 第1報,SiCおよびTiC粒子分散の効果 , 1994 .

[5]  T. Nishimura,et al.  Crack healing in silicon nitride and alumina ceramics , 1996 .

[6]  T. K. Gupta,et al.  Crack Healing and Strengthening of Thermally Shocked Alumina , 1976 .

[7]  J. J. Petrovic,et al.  Controlled Surface Flaws in Hot‐Pressed SiC , 1975 .

[8]  M. Chu,et al.  Crack healing behavior of silicon carbide ceramics , 2004 .

[9]  Kotoji Ando,et al.  A PRELIMINARY STUDY ON CRACK HEALING BEHAVIOUR OF Si3 N4 /SiC COMPOSITE CERAMICS , 1998 .

[10]  繁美 佐藤,et al.  炭化物粒子分散によるムライトの高強度化に関する研究 : 第2報, 添加SiC粒子径と熱処理の影響 , 1995 .

[11]  Shigemi Sato,et al.  Static and cyclic fatigue behaviour of crack-healed Si3N4/SiC composite ceramics , 2001 .

[12]  Shigemi Sato,et al.  Strengthening of Mullite by Dispersion of Carbide Ceramics Particles , 1996 .

[13]  W. J. Plumbridge,et al.  High temperature crack annealing effects on fracture toughness of alumina and alumina-SiC composite , 1996 .

[14]  Kotoji Ando,et al.  Crack-healing behavior, high temperature and fatigue strength of SiC-reinforced silicon nitride composite , 2000 .

[15]  Shigemi Sato,et al.  Crack Healing Behaviour and High Temperature Strength of Silicon Nitride Ceramics. , 1999 .