Oxidation-induced crack healing in Ti3AlC2 ceramics

Crack healing of Ti3AlC2 was investigated by oxidizing a partially pre-cracked sample. A crack near a notch was introduced into the sample by tensile deformation. After oxidation at 1100 °C in air for 2 h, the crack was completely healed, with oxidation products consisting primarily of α-Al2O3 as well as some rutile TiO2. The indentation modulus and hardness of the crack-healed zone are slightly higher compared with those of the Ti3AlC2 base material. The preferential oxidation of Al atoms in Ti3AlC2 grains on the crack surface results in the predominance of α-Al2O3 particles forming in a crack less than 1 μm wide.

[1]  A. R. Cooper,et al.  Thermal healing of cracks in glass , 1988 .

[2]  Shigemi Sato,et al.  (Crack-healing+proof test): a new methodology to guarantee the structural integrity of a ceramics component , 2002 .

[3]  R. Bradt,et al.  DISCUSSIONS AND NOTES , 1977 .

[4]  Yanchun Zhou,et al.  Oxidation behavior of Ti3AlC2 at 1000–1400 °C in air , 2003 .

[5]  Y. Zhou,et al.  Stability and selective oxidation of aluminum in nano-laminate Ti3AlC2 upon heating in argon , 2003 .

[6]  Yanchun Zhou,et al.  Shear strength and shear failure of layered machinable Ti3AlC2 ceramics , 2004 .

[7]  M. Barsoum,et al.  Synthesis and Characterization of Ti3AlC2 , 2004 .

[8]  Y. Zhou,et al.  Interfacial microstructure of Ti3AlC2 and Al2O3 oxide scale , 2006 .

[9]  Zhang Zhili,et al.  Tribophysical Properties of Polycrystalline Bulk Ti3AlC2 , 2005 .

[10]  O. Anderson,et al.  High‐Temperature Elastic Properties of Polycrystalline MgO and Al2O3 , 1966 .

[11]  Shigemi Sato,et al.  Crack-healing ability of structural ceramics and a new methodology to guarantee the structural integrity using the ability and proof-test , 2005 .

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

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

[14]  I. M. Robertson,et al.  Oxidation behavior of a single phase γ-TiAl alloy in low-pressure oxygen and hydrogen , 2005 .

[15]  Ki-Yong Lee,et al.  Diffusive crack-healing behavior in polycrystalline alumina: A comparison between microwave annealing and conventional annealing , 1997 .

[16]  D. Lee,et al.  High-temperature oxidation of Ti 3AlC 2 between 1173 and 1473 K in air , 2006 .

[17]  Yanchun Zhou,et al.  Ab initio geometry optimization and ground state properties of layered ternary carbides Ti3MC2 (M = Al, Si and Ge) , 2001 .

[18]  Yanchun Zhou,et al.  Microstructures and adhesion of the oxide scale formed on titanium aluminum carbide substrates , 2006 .

[19]  Shigemi Sato,et al.  Crack-healing behavior under stress of mullite/silicon carbide ceramics and the resultant fatigue strength , 2004 .

[20]  James F. Shackelford,et al.  The CRC Materials Science And Engineering Handbook , 1991 .

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