Effect of Cr₇C₃ on the mechanical, thermal, and electrical properties of Cr₂AlC

In this work, phase pure Cr₂AlC and impure Cr₂AlC with Cr₇C₃ have been fabricated to investigate the mechanical, thermal, and electrical properties. The thermal expansion coefficient is determined as 1.25 × 10^-5 K^-1 in the temperature range of 25-1200 °C. The thermal conductivity of the Cr ₂AlC is 15.73 W/m K when it is measured at 200 °C. With increasing temperature from 25 °C to 900 °C, the electrical conductivity of Cr₂AlC decreases from 1.8 × 10⁶ Ω^-1 m^-1 to 5.6 × 10⁵ Ω^-1 m^-1. For the impure phase of Cr ₇C₃, it has a strengthening and embrittlement effect on the bulk Cr₂AlC. And the Cr₂AlC with Cr₇C ₃ would result in a lower high-temperature thermal expansion coefficient, thermal conductivity, specific heat capacity and electrical conductivity.