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A Comparative Study of Decomposition Kinetics in Max Phases at Elevated Temperature

Chapter


Abstract


  • The role of pore microstructures on the susceptibility of MAX phases (Ti3SiC2, Ti3AIC2,

    TisAIC, Ti2AIN2, Ti4AIN3) to thermal dissociation at 1300-1550°C in high vacuum has been

    studied using in-situ neutron diffraction. Above 1400°C, MAX phases decomposed to binary

    carbide (e.g. TiCx) or binary nitride (e.g. TiNx), primarily through the sublimation of A-elements

    such as Al or Si, forming in a porous surface layer of MXx. Positive activation

    energies were determined for decomposed MAX phases with coarse pores but a negative

    activation energy when the pore size was less than 1.0 μm. The role of pore microstructures

    on the decomposition kinetics is discussed.

Publication Date


  • 2013

Citation


  • Low, I. M. & Pang, W. K. (2013). A Comparative Study of Decomposition Kinetics in Max Phases at Elevated Temperature. In D. Zhu, H. T. Lin, Y. Zhou & T. Hwang (Eds.), Advanced Ceramic Coatings and Materials for Extreme Environments II (pp. 179-185). Hoboken, New Jersey: John Wiley and Sons.

International Standard Book Number (isbn) 13


  • 9781118205891

Book Title


  • Advanced Ceramic Coatings and Materials for Extreme Environments II

Start Page


  • 179

End Page


  • 185

Place Of Publication


  • Hoboken, New Jersey

Abstract


  • The role of pore microstructures on the susceptibility of MAX phases (Ti3SiC2, Ti3AIC2,

    TisAIC, Ti2AIN2, Ti4AIN3) to thermal dissociation at 1300-1550°C in high vacuum has been

    studied using in-situ neutron diffraction. Above 1400°C, MAX phases decomposed to binary

    carbide (e.g. TiCx) or binary nitride (e.g. TiNx), primarily through the sublimation of A-elements

    such as Al or Si, forming in a porous surface layer of MXx. Positive activation

    energies were determined for decomposed MAX phases with coarse pores but a negative

    activation energy when the pore size was less than 1.0 μm. The role of pore microstructures

    on the decomposition kinetics is discussed.

Publication Date


  • 2013

Citation


  • Low, I. M. & Pang, W. K. (2013). A Comparative Study of Decomposition Kinetics in Max Phases at Elevated Temperature. In D. Zhu, H. T. Lin, Y. Zhou & T. Hwang (Eds.), Advanced Ceramic Coatings and Materials for Extreme Environments II (pp. 179-185). Hoboken, New Jersey: John Wiley and Sons.

International Standard Book Number (isbn) 13


  • 9781118205891

Book Title


  • Advanced Ceramic Coatings and Materials for Extreme Environments II

Start Page


  • 179

End Page


  • 185

Place Of Publication


  • Hoboken, New Jersey