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Mechanical and Thermal Properties of Antiperovskite Ti 3 AlC Prepared by an In Situ Reaction/Hot‐Pressing Route
Author(s) -
Zhang Xiaowen,
Wang Xiaohui,
Li Fangzhi,
Zhou Yanchun
Publication year - 2009
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2009.03249.x
Subject(s) - materials science , flexural strength , thermal expansion , composite material , ceramic , hot pressing , fracture toughness , vickers hardness test , microstructure , atmospheric temperature range , thermal conductivity , compressive strength , shear modulus , thermodynamics , physics
Bulk Ti 3 AlC ceramic containing 2.68 wt% TiC was prepared by an in situ reaction/hot‐pressing route. The reaction path, microstructure, mechanical and thermal properties were systematically investigated. At room temperature Vickers hardness of Ti 3 AlC ceramic is 7.8 GPa. The flexural strength, compressive strength, and fracture toughness are 182, 708 MPa, and 2.6 MPa·m 1/2 , respectively. Its apparent Young's modulus, shear modulus, bulk modulus and Possion's ratio are 208.9, 83.4, 140.4 GPa, and 0.25 at room temperature. Apparent Young's modulus decreases slowly with the increasing temperature, and at 1210°C the modulus is 170 GPa. The average coefficient of thermal expansion of Ti 3 AlC ceramic is about 10.1 × 10 −6 K −1 in the temperature range of 150°–1200°C. Both the molar heat capacity and thermal conductivity increase with an increase in the temperature. At 300 and 1373 K, the molar heat capacities are 87 and 143·J·(mol·K) −1 , while the thermal conductivities are 8.19 and 15.6 W·(m·K) −1 , respectively.