A conceptual study into the potential of M(n+1)AX(n)-phase ceramics for self-healing of crack damage

作者：Farle Ann Sophie^*; Kwakernaak Cees; van der Zwaag Sybrand; Sloof Willem G

来源：Journal of the European Ceramic Society, 2015, 35(1): 37-45.

DOI：10.1016/j.jeurceramsoc.2014.08.046

• Self-healing
• MAX-phase ceramics
• Crack filling
• Adhesion
• Selective oxidation

Recently, autonomous crack healing has been reported for Ti2AlC and Ti3AlC2 of the M(n+1)AX(n) (MAX) phase ceramics. The desirable healing behaviour is due to the formation of a stable, well-adhering oxide with a high relative volume expansion and having mechanical properties close to those of the matrix. The present analysis aims to predict the occurrence of similar autonomous high-temperature crack-healing behaviour in other MAX phase materials on the basis of postulated primary and secondary criteria analysing their reported thermodynamic, thermo-kinetic and mechanical properties. The analysis correctly identified Ti2AlC and Ti3AlC2 as suitable MAX phase variants for autonomous high-temperature crack healing. Also other Al-containing MAX phases seem promising, of which Ta2AlC and V2AlC were identified as worth a detailed investigation of their crack-healing behaviour. Of the Si-containing MAX phase compounds Ti3SiC2 met the criteria for autonomous high-temperature crack healing.

• 出版日期2015-1