Elastic and thermal properties of Zr2Al3C4: Experimental investigations and ab initio calculations

Abstract

Articles you may be interested in FP-LAPW investigation of electronic, magnetic, elastic and thermal properties of Fe-doped zirconium nitride AIP Advances 4, 057121 (2014); 10.1063/1.4879798Theoretical calculations for structural, elastic, and thermodynamic properties of c-W3N4 under high pressure This article presents the results of combined experimental and theoretical studies of elastic and thermal properties of Zr 2 Al 3 C 4 carbide. The full set of second order elastic constants, bulk modulus, shear modulus, and Young's modulus of Zr 2 Al 3 C 4 were calculated and compared with those of Zr 3 Al 3 C 5 and ZrC. The experimentally measured Young's modulus and shear modulus are in good agreement with theoretical ones. The calculated Debye temperature from elastic constants of Zr 2 Al 3 C 4 is 830 K, which is slightly higher than that of Zr 3 Al 3 C 5 , and exhibits pronounced enhancement in comparison with that of ZrC. The highest Debye temperature of Zr 2 Al 3 C 4 is related with its highest specific stiffness, i.e., the stiffness-to-weight ratio. The heat capacity and thermal conductivity of Zr 2 Al 3 C 4 were measured by means of the flash method. The thermal conductivity of Zr 2 Al 3 C 4 decreases with increasing temperature, for instance the values at room temperature and 1600 K are 15.5 and 10.1 W/m K, respectively. The investigations provide information on elastic and thermal properties of Zr 2 Al 3 C 4 with promising high temperature applications.

Mechanical and Thermophysical Properties of Zr–Al–Si–C Ceramics

“…Zr 2 Al 3 C 4 and Zr 3 Al 3 C 5 were recently developed by adding Al into ZrC; these ternary zirconium aluminum carbides show superior oxidation resistance, strength, specific stiffness, and toughness to ZrC. [1][2][3][4][5][6][7][8] Furthermore, Zr-Al-C ceramics exhibit high retained stiffness at elevated temperatures. For instance, the Young's modulus of Zr 3 Al 3 C 5 ceramic decreases slowly with increasing temperature and the elastic stiffness at 16001C remaines 78% of that at room temperature.…”

Isothermal oxidation of bulk Zr2Al3C4 at 500 to 1000 °C in air

“…6,7 To improve the oxidation of ZrC, Zr 2 Al 3 C 4 it was recently synthesized, and its mechanical properties are comparable to those of ZrC. 8,9 Because of the difficulty in synthesizing single-phase and dense Zr 2 Al 3 C 4 , there has been only one study involving the oxidation behavior of Zr 2 Al 3 C 4 up to now. Leela-adisorn et al 10 investigated the nonisothermal oxidation behavior of Zr 2 Al 3 C 4 samples with various densities and found that the oxidation resistance was improved when the density was increased.…”

“…Leela-adisorn et al 10 investigated the nonisothermal oxidation behavior of Zr 2 Al 3 C 4 samples with various densities and found that the oxidation resistance was improved when the density was increased. In addition, the oxidation resistance of Zr 3 Al 3 C 5 , which has similar crystal structure and properties to Zr 2 Al 3 C 4 , [8][9][10][11][12][13] is superior to that of ZrC in powder form. 14 Compared with ZrC, the improved oxidation resistance of Zr-Al-C ceramics is expected.…”

Thermal properties of single-phase Y2SiO5

“…Linear thermal expansion coefficients of ␥-Y 2 Si 2 O 7 , Y 2 SiO 5 and some nonoxide ceramics5,32,[39][40][41] nickel-based superalloys. 32,38 The nickel-based alloys used for turbine blades have a TEC from 14.0 to 16.0 × 10 −6 K −1 In…”