Microstructure, mechanical properties and oxidation resistance of Mo5Si3-Al2O3 composite

被引：29
作者：
Chen, Hui [1 ]
Ma, Qin [2 ]
Shao, Xin [1 ]
Ma, Jie [1 ]
Wang, Changzheng [1 ]
Huang, Baoxu [1 ]
机构：
[1] Liaocheng Univ, Coll Mat Sci & Engn, Res Inst Nonferrous Met, Liaocheng 252000, Peoples R China
[2] Lanzhou Univ Technol, Sch Mat Sci & Engn, State Key Lab Gansu Adv Nonferrous Met Mat, Lanzhou 730050, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2014年 / 592卷
关键词：
Mo5Si3; Al2O3; Microstructure; Oxidation resistance; Mechanical properties; MOLYBDENUM DISILICIDE; SITE OCCUPATION; BEHAVIOR; MOSI2; FABRICATION; ANISOTROPY; COATINGS; POWDER;
D O I：
10.1016/j.msea.2013.10.095
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Mo5Si3-Al2O3 composite powders were successfully synthesized by ball milling MoO3, Mo, Si and Al powders. A dense nanostructure Mo5Si3-Al2O3 composite was consolidated by hot pressing sintering. Microstructure, mechanical properties and oxidation resistance of Mo5Si3-Al2O3 composite were investigated. Results showed that Mo5Si3-Al2O3 composite has good mechanical properties and oxidation resistance compared with Mo5Si3 alloy. Mo5Si3-Al2O3 composite with a relative density of 96.1% and the average grain size was approximately 1-3 mu m. The hardness, flexure strength and fracture toughness of Mo5Si3-Al2O3 composite are 152 GPa, 630 MPa and 6.53 MPa m(1/2), respectively. Meanwhile, the composite has higher strength (similar to 276 MPa) at 1400 degrees C. The oxidation test at 600 degrees C showed that the addition of Al2O3 effectively restrained the pest oxidation of Mo5Si3. The oxide scale consists of SiO2-Al2O3 was formed on the surface of Mo5Si3-Al2O3 composite at 1200 degrees C, and the SiO2-Al2O3 film presents good oxidation resistance compared to the pure SiO2 film. (C) 2013 Elsevier B.V. All rights reserved.
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页码：12 / 18
页数：7
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