Mechanical properties and oxidation behavior of Ti-doped Nb4AlC3

被引：44
作者：
Gu, Jian [1 ]
Pan, Limei [1 ]
Yang, Jian [1 ]
Yu, Lei [1 ]
Zhang, Haibin [2 ]
Zou, Wenjie [1 ,2 ]
Xu, Canhui [2 ]
Hu, Chunfeng [3 ]
Qiu, Tai [1 ]
机构：
[1] Nanjing Tech Univ, Coll Mat Sci & Engn, Nanjing 210009, Jiangsu, Peoples R China
[2] China Acad Engn Phys, Inst Nucl Phys & Chem, Mianyang 621900, Peoples R China
[3] Southwest Jiaotong Univ, Sch Mat Sci & Engn, Key Lab Adv Technol Mat, Minist Educ, Chengdu 611756, Peoples R China
来源：
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2016年 / 36卷 / 04期
基金：
中国国家自然科学基金;
关键词：
(Nb1-xTix)(4)AlC3 solid solutions; In situ synthesis; Mechanical properties; Oxidation resistance; RESISTANCE; TI3SIC2; NB2ALC;
D O I：
10.1016/j.jeurceramsoc.2015.10.023
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：
Herein, we present the first report on fully dense and phase pure (Nb1-xTix)(4)AlC3 ceramics (x=0-03), fabricated by in situ reaction hot-pressing method. The solid solution of Ti provides a significant strengthening effect to Nb4AlC3. Typically, (Nb0.8Ti0.2)(4)AlC3 exhibits the highest flexural strength (508 +/- 28 MPa) and fracture toughness (8.4 +/- 0.2 MPa m(1/2)), increasing by 47% and 18%, respectively. The Vickers hardness of (Nb0.7Ti0.3)(4)AlC3 (4.4 +/- 0.2 GPa) is 69% higher than that of Nb4AlC3. The (Nb0.8Ti0.2)(4)AlC3 also retains a high Young's modulus of 294 GPa at 1500 degrees C (84% of room-temperature value). Due to the formation of a more protective oxide scale consisting of TiNb2O7 and NbAlO4, the (Nb1-xTix)(4)AlC3 exhibits a greatly improved oxidation resistance. Interestingly, a better oxidation resistance at 1000 degrees C and 1100 degrees C than at 800 degrees C and 900 degrees C was observed for (Nb1-xTix)(4)AlC3. Excellent comprehensive properties render the (Nb1-xTix)(4)AlC3 solid solutions promising high-temperature structural materials. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1001 / 1008
页数：8
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