Oxidation mechanisms in bulk Ti2AlC: Influence of the grain size

被引：40

作者：

Yu, Wenbo ^{[1
]}

Vallet, Maxime ^{[2
,4
]}

Levraut, Bertrand ^{[3
]}

Gauthier-Brunet, Veronique ^{[3
]}

Dubois, Sylvain ^{[3
]}

机构：

[1] Beijing Jiaotong Univ, Sch Mech & Elect Control Engn, Ctr Mat Sci & Engn, Beijing 100044, Peoples R China

[2] Univ Toulouse, CEMES, CNRS, UPS, 29 Rue Jeanne Marvig,BP 94347, Toulouse 04, France

[3] Univ Poitiers, Inst PPRIME, CNRS, UPR 3346,ENSMA, Bat SP2MI,Teleport2,BP179, F-86962 Futuroscope, France

[4] Univ Paris Saclay, Serv Rech Met Phys, CEA, DEN, F-91191 Gif Sur Yvette, France

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2020年 / 40卷 / 05期

关键词：

Ti2AlC; MAX phases; Oxidation mechanism; Grain size; HIGH-TEMPERATURE OXIDATION; MAX PHASES; MICROSTRUCTURAL CHARACTERIZATION; HEALING PERFORMANCE; TIN+1ALXN N=1-3; TI3ALC2; CR2ALC; STABILITY; EVOLUTION; CERAMICS;

D O I：

10.1016/j.jeurceramsoc.2020.01.042

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

In this work, oxidation mechanisms were studied in fine-grained (FG) and coarse-grained (CG) Ti2AlC bulk samples. Results showed that the oxidation kinetics are controlled by the grain size of Ti2AlC. Bigger are the grains, faster is the oxidation. A dense and protective Al2O3 layer forms at the surface of FG-Ti2AlC samples while for the CG-Ti2AlC samples, a thick TiO2 layer forms on top of a discontinuous Al2O3. CG-Ti2AlC was observed to simultaneously transform into Ti3AlC2 and TiC instead of being directly transformed into TiC. This transformation result in the following crystallographically sandwich-like structure: (0001) Ti2AlC // (0001) Ti3AlC2 // (111) TiC. The volume shrinkage associated to this transformation produces elongated holes that are partially filled by alpha-Al2O3. The stress caused by the volume shrinkage generates cracks at the surface, which makes the oxygen inwards diffusion easier and thus worsens the oxidation resistance the CG-Ti2AlC bulk.

引用

页码：1820 / 1828

页数：9

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