Comparative study on oxidation behavior of Ti2AlN coatings in air and pure steam

被引：17

作者：

Wang, Zhenyu ^{[1
]}

Li, Xiaowei ^{[1
,3
]}

Li, Wentao ^{[1
]}

Ke, Peiling ^{[1
,2
]}

Wang, Aiying ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Zhejiang Key Lab Marine Mat & Protect Technol, Key Lab Marine Mat & Related Technol, Ningbo 315201, Zhejiang, Peoples R China

[2] Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 10049, Peoples R China

[3] Korea Inst Sci & Technol, Computat Sci Ctr, Seoul 136791, South Korea

来源：

CERAMICS INTERNATIONAL | 2019年 / 45卷 / 07期

基金：

中国博士后科学基金;

关键词：

MAX phase; Oxidation mechanism; Pure steam; Linear kinetics; Al2O3; layer; HIGH-TEMPERATURE OXIDATION; WATER-VAPOR; M(N+1)AX(N) PHASES; THIN-FILMS; TITANIUM; TI3ALC2; RESISTANCE; CR2ALC; OXYGEN;

D O I：

10.1016/j.ceramint.2019.02.004

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：

The oxidation behavior of the Ti2AlN coatings is comparatively investigated at 750 degrees C in air and in pure steam conditions, respectively. The linear kinetics composed of two stages is observed for each case, suggesting a chemical reaction determining process, and the second stage behaves a slightly higher oxidation rate. In air, the oxidation behavior exhibits an inhomogeneous oxidation due to the presence of macro-particles and impurity phases in the coating, while a transition from inhomogeneous oxidation to homogeneous oxidation occurs in pure steam. Compared to that in air, the oxidation process in pure steam is accelerated, leading to higher mass gains. XRD and EDX analyses indicate that Al easily diffuses to the surface and thus forms alpha-Al2O3 layer under the two atmospheres, which result from the high Al activity within MAX phase. Additionally, the scaling mechanism of Ti2AlN coatings is discussed in terms of the microstructure evolution.

引用

页码：9260 / 9270

页数：11

共 36 条

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