Author: Li Tian, Yueming Li, Peng Ju, Chao Fu, Enge Wang, Guorui Zha

Journal:Ceramics International

DOI:10.1016/J.CERAMINT.2021.12.192

Abstract

High porosity (86%) macro-porous Ti3AlC2 with glassy carbon has been successfully fabricated by the replica template method for the first time. Glassy carbon was introduced into macro-porous Ti3AlC2 by adding phenol-formaldehyde resin to the slurry and degreased in an oxygen-free environment during the preparation process. The phase, morphology and microstructure were revealed by X-ray diffraction (XRD), Raman spectrum, scanning electron microscopy (SEM), transmission electron microscopy (TEM), respectively. By compression experiment, the strength of macro-porous Ti3AlC2 containing glassy carbon increased by 17 times compared with that without glassy carbon, from 0.21 ± 0.03 to 3.6 ± 0.7 MPa. In order to analyze the strengthening mechanism of the addition of glassy carbon in macro-porous Ti3AlC2, the method proposed by Taya et al. was selected to calculate the residual thermal stress caused by the introduction of glassy carbon, and the stress field generated around it was discussed. In addition, the corrosion behavior of macro-porous Ti3AlC2 in 0.5 M H2SO4 acid solution was evaluated. The corrosion kinetics of macro-porous Ti3AlC2 and the influence of the presence of glass carbon on the corrosion resistance of Ti3AlC2 were analyzed and discussed. The results indicate that glassy carbon existing on the surface of Ti3AlC2 effectively separates Ti3AlC2 from sulfuric acid solution, which plays an important role in protecting the Ti3AlC2 substrate, and promotes a significant improvement in electrochemical performance. 

Keyword

Porous ceramics;Ti;3;AlC;2;Glassy carbon;Compressive strength;Electrochemical property