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Research Article | Open Access

Synthesis, microstructure, and properties of high purity Mo2TiAlC2 ceramics fabricated by spark plasma sintering

Yunhui NIUa,†, Shuai FUb,†, Kuibao ZHANGa, Bo DAIa, Haibin ZHANGc, Salvatore GRASSOb, Chunfeng HUb( )
State Key Laboratory of Environment-Friendly Energy Materials, Southwest University of Science and Technology, Mianyang 621010, China
Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China

† Yunhui Niu and Shuai Fu contributed equally to this work.

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Abstract

The synthesis, microstructure, and properties of high purity dense bulk Mo2TiAlC2 ceramics were studied. High purity Mo2TiAlC2 powder was synthesized at 1873 K starting from Mo, Ti, Al, and graphite powders with a molar ratio of 2:1:1.25:2. The synthesis mechanism of Mo2TiAlC2 was explored by analyzing the compositions of samples sintered at different temperatures. It was found that the Mo2TiAlC2 phase was formed from the reaction among Mo3Al2C, Mo2C, TiC, and C. Dense Mo2TiAlC2 bulk sample was prepared by spark plasma sintering (SPS) at 1673 K under a pressure of 40 MPa. The relative density of the dense sample was 98.3%. The mean grain size was 3.5 μm in length and 1.5 μm in width. The typical layered structure could be clearly observed. The electrical conductivity of Mo2TiAlC2 ceramic measured at the temperature range of 2-300 K decreased from 0.95 × 106 to 0.77 × 106 Ω-1·m-1. Thermal conductivity measured at the temperature range of 300-1273 K decreased from 8.0 to 6.4 W·(m·K)-1. The thermal expansion coefficient (TEC) of Mo2TiAlC2 measured at the temperature of 350-1100 K was calculated as 9.0 × 10-6 K-1. Additionally, the layered structure and fine grain size benefited for excellent mechanical properties of low intrinsic Vickers hardness of 5.2 GPa, high flexural strength of 407.9 MPa, high fracture toughness of 6.5 MPa·m1/2, and high compressive strength of 1079 MPa. Even at the indentation load of 300 N, the residual flexural strength could hold 84% of the value of undamaged one, indicating remarkable damage tolerance. Furthermore, it was confirmed that Mo2TiAlC2 ceramic had a good oxidation resistance below 1200 K in the air.

Keywords

MAX phaseMo2TiAlC2synthesismicrostructureproperties

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Journal of Advanced Ceramics
Volume 9 Issue 6,
December 2020
Pages 759-768
DOI: 10.1007/s40145-020-0412-7
Cite this article:
NIU Y, FU S, ZHANG K, et al. Synthesis, microstructure, and properties of high purity Mo2TiAlC2 ceramics fabricated by spark plasma sintering. Journal of Advanced Ceramics, 2020, 9(6): 759-768. https://doi.org/10.1007/s40145-020-0412-7

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Received: 12 May 2020
Revised: 13 August 2020
Accepted: 14 August 2020
Published: 23 December 2020
© The Author(s) 2020

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