Multiple crack healing of a Ti2AlC ceramic

A highly attractive self-healing material would be one which combines excellent mechanical properties with a multiple healing capability. Selfhealing ceramics have been studied for over 40 years to obtain some performance recovery and to prevent material failure during service, but so far only materials with the capability of single healing event per damage site have been realized. Here we report on a self-healing Ti2AlC ceramic capable of repeatedly repairing damage events. The Ti2AlC ceramic achieves at least seven healing cycles after repeated cracking at a given location. The main healing mechanism at high temperature is the filling of the cracks by the formation well adhering -Al2O3 and the presence of some rutile TiO2. For healed samples, the flexural strength returned or even slightly exceeded the virginal strength. The fracture toughness recovery has been quantified for multiple healing cycles. © 2012 Elsevier Ltd. All rights reserved.

[1]  F. F. Lange,et al.  Crack Healing by Heat Treatment , 1970 .

[2]  Scott R White,et al.  Self‐Healing of Internal Damage in Synthetic Vascular Materials , 2010, Advanced materials.

[3]  R. C. Bradt,et al.  Effects of oxidation and oxidation under load on strength distributions of Si3N4 , 1982 .

[4]  F. Lange.  Healing of Surface Cracks in SiC by Oxidation , 1970 .

[5]  M. Radovic,et al.  Microstructure and Residual Stress of Alumina Scale Formed on Ti2AlC at High Temperature in Air , 2007 .

[6]  Yanfei Zhou,et al.  High-Temperature Oxidation Behavior of Ti2AlC in Air , 2003 .

[7]  Y. Zhou,et al.  Intermediate-temperature oxidation behavior of Ti_2AlC in air , 2002 .

[8]  J. Hosson,et al.  TEM study of the initial oxide scales of Ti2AlC , 2011 .

[9]  S. Zwaag,et al.  Ultra-high temperature ablation behavior of Ti2AlC ceramics under an oxyacetylene flame , 2011 .

[10]  Kotoji Ando,et al.  Crack-Healing Behavior of Al 2 O 3 Toughened by SiC Whiskers , 2003 .

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

[12]  W. J. Plumbridge,et al.  Crack Healing in a Silicon Nitride Ceramic , 2005 .

[13]  J.Th.M. De Hosson,et al.  High temperature healing of Ti2AlC: On the origin of inhomogeneous oxide scale , 2011 .

[14]  Chi-Yuen Huang,et al.  Effect of TiO2 addition on the sintering behavior, hardness and fracture toughness of an ultrafine alumina , 2008 .

[15]  N. Padture,et al.  Contact-damage-resistant ceramic/single-wall carbon nanotubes and ceramic/graphite composites , 2004, Nature materials.

[16]  S van der Zwaag,et al.  Self-healing behaviour in man-made engineering materials: bioinspired but taking into account their intrinsic character , 2009, Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences.

[17]  J. Lewis,et al.  Self-healing materials with microvascular networks. , 2007, Nature materials.

[18]  Michel W. Barsoum,et al.  The MN+1AXN phases: A new class of solids , 2000 .

[19]  S. V. D. Zwaag.  Self healing materials : an alternative approach to 20 centuries of materials science , 2007 .

[20]  Yanchun Zhou,et al.  A first-principles investigation of the phase stability of Ti(2)AlC with Al vacancies , 2008 .

[21]  Brian R. Lawn,et al.  A Critical Evaluation of Indentation Techniques for Measuring Fracture Toughness: I , 1981 .

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

[23]  S. Ghosh,et al.  Self‐Healing Materials: Fundamentals, Design Strategies, and Applications , 2009 .

[24]  Lai-fei Cheng,et al.  Identification of damage tolerance of Ti3SiC2 by hardness indentations and single edge notched beam test , 2002 .

[25]  P. Heaney,et al.  Thermal expansion of anatase and rutile between 300 and 575 K using synchrotron powder X-ray diffraction , 2007, Powder Diffraction.

[26]  Shigemi Sato,et al.  Crack-healing behavior and static fatigue strength of Si3N4/SiC ceramics held under stress at temperature (800, 900, 1000 °C) , 2003 .

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

[28]  J.Th.M. De Hosson,et al.  Oxidation-induced crack healing in Ti3AlC2 ceramics , 2008 .