An investigation into the microstructure and mechanical properties of V2AlC MAX phase prepared by microwave sintering

被引:44
作者
Hossein-Zadeh, Mohsen [1 ]
Ghasali, Ehsan [2 ,3 ]
Mirzaee, Omid [1 ]
Mohammadian-Semnani, Hamidreza [1 ]
Alizadeh, Masoud [3 ]
Orooji, Yasin [2 ]
Ebadzadeh, Touradj [3 ]
机构
[1] Semnan Univ, Fac Mat & Met Engn, Semnan, Iran
[2] Nanjing Forestry Univ, Coll Mat Sci & Engn, 159 Longpan Rd, Nanjing 210037, Jiangsu, Peoples R China
[3] Mat & Energy Res Ctr, Ceram Dept, Alborz, Iran
关键词
Microstructure; V2AlC; MAX phase; Microwave sintering; SPARK PLASMA; GROWTH; STABILITY; OXIDATION; TI;
D O I
10.1016/j.jallcom.2019.05.029
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The present study investigated the mechanical properties and microstructure of V2AlC MAX phase prepared by the microwave sintering process. The powders mixture of the V-Al-C system with the molar ratio of 2:1.5:1 was mixed through a mixer mill for 10 min in the ethanol media without any aggressive milling condition. The microwave sintering process was performed at the sintering temperatures of 1200, 1300 and 1400 degrees C without any soaking times and the protective atmosphere in the graphite bed. The XRD patterns showed the formation of the V2AlC max phase at the sintering temperature of 1200 degrees C with VC and Al2O3 compounds. In contrast, the sample sintered at 1300 degrees C displayed completely matched peaks with the reference pattern of the V2AlC MAX phase. Moreover, the related XRD patterns belonging to the specimen sintered at 1400 degrees C demonstrated the formation of VC and Al2O3 compounds as the dominant crystalline phases. The microstructure studies also showed the formation of the nano-layered MAX phases at the sintering temperatures of 1200 and 1300 degrees C. However, in the case of the sintering temperature of 1400 degrees C, the VC phases turned into the nano-blades shape after the cooling process. The highest bending strength of 189 +/- 21 MPa was obtained for the specimen sintered at 1300 degrees C, while the highest Vickers hardness of 892 +/- 15 Hv was calculated for the sample sintered at 1400 degrees C as the ceramic composite with the VC-Al2O3 composition. (C) 2019 Elsevier B.V. All rights reserved.
引用
收藏
页码:291 / 303
页数:13
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