Our website is currently undergoing maintenance. Article records and full texts remain available. Submissions can be made through the Editorial Manager.

Electrical and Thermal Properties of Ti₃AlC₂ at High Temperature

X.-K. Qian, Y.-B. Li, X.-D. He, Y.-X. Chen, S.-N. Yun

Journal of Ceramic Science and Technology, Vol. 2, No. 3 (2011), pp. 155-158

DOI: 10.4416/JCST2011-00018

Download full article (PDF)

Abstract

In this paper, we report on the electrical and thermal properties of predominantly single-phase Ti3AlC2 ceramics (96.7 wt%) as a function of temperature. The results show that Ti3AlC2 is a good electrical and thermal conductor at high temperature. From 300 to 1173 K, the electrical resistivity of Ti3AlC2 increases linearly from 3.4 × 10-5 to which indicates that Ti3AlC2 ceramic is a metallic conductor. In the 473 to 1473 K temperature range, the coefficient of thermal expansion of Ti3AlC2 yields an average value of 9.3 × 10-6 K-1, which is comparable with the coefficients of Ti2AlC and Ti3SiC2. The thermal conductivity increases from 22.6 to 26.4 W·m-1·K-1 with rising temperature from 473 to 1473 K. It is found that the electronic contribution to the thermal conductivity is the dominant mechanism. The molar heat capacity of Ti3AlC2 is 138.6 J·mol-1·K-1 at 473 K and extrapolates to 168.5 J·mol-1·K-1 at 1473 K.

Keywords

Ceramics, thermal conductivity, thermal expansion, electrical properties

View this issue · Article & DOI index