Mechanical characteristics and high temperature stability of oxidized Ti3AlC2 nanolaminat

International Conference on Oxide Materials for Electronic Engineering - fabrication, properties and applications (OMEE-2014) Pub Date : 2014-05-26 DOI:10.1109/OMEE.2014.6912349

T. Prikhna, O. Ostash, T. Basyuk, A. Ivasyshin, V. Podhurska, M. Loshak, T. Cabioc’h, P. Chartier, V. Sverdun, V. Moshchil, S. Dub, M. Karpets, A. Starostina, A. Kozyrev

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Abstract

The oxide film formed on the surface of the highly dense (ρ=4.27 g/cm³, porosity 1 %) material based on nanolaminated MAX phase Ti₃AlC₂ (89 % Ti₃AlC₂, 6 % TiC, 5 % Al₂O₃) manufactured by hot pressing (at 30 MPa) made the material highly resistant in air at high temperatures: after 1000 hours of exposition at 600 °C it demonstrated a higher resistance to oxidation than chromium ferrite steels (Crofer GPU and JDA types). Due to the surface oxidation self-healing of defects took place. Besides, the Ti₃AlC₂ material demonstrated resistance against high-temperature creep and after being kept in H₂ at 600 °C for 3h its bending strength reduced by 5 % only. At room temperature the Ti₃AlC₂ bulk exhibited microhardness Hμ = 4.6 GPa (at 5 N), hardness HV₅₀ = 630 (at 50 N ) and HRA = 70 (at 600 N), Young modulus was 140 ± 29 GPa, bending strength =500 MPa, compression strength 700 MPa, and fracture toughness K_1C=10.2 MPa·m^0.5.

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氧化Ti3AlC2纳米层的力学特性及高温稳定性

通过热压(30 MPa)制备的基于纳米层化MAX相Ti3AlC2 (89% Ti3AlC2, 6% TiC, 5% Al2O3)的高密度(ρ=4.27 g/cm3，孔隙率1%)材料表面形成的氧化膜使该材料在高温空气中具有很高的抗氧化性:在600℃下暴露1000小时后，它表现出比铬铁素体钢(Crofer GPU和JDA类型)更高的抗氧化性。由于表面氧化，缺陷发生自愈。此外，Ti3AlC2材料具有抗高温蠕变性能，在600℃的H2中保存3h后，其抗弯强度仅下降5%。室温下，Ti3AlC2体的显微硬度Hμ = 4.6 GPa (5 N)，硬度HV50 = 630 (50 N)， HRA = 70 (600 N)，杨氏模量140±29 GPa，抗弯强度为500 MPa，抗压强度为700 MPa，断裂韧性K1C=10.2 MPa·m0.5。

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International Conference on Oxide Materials for Electronic Engineering - fabrication, properties and applications (OMEE-2014)

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