| Mo(Si_(1-x)Al_x)_2/Al_2O_3复合材料的制备与强韧化 |
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| 引用本文： | 郭瑞霞,朱高明,王晓虹,牛继南,刘章生,冯培忠. Mo(Si_(1-x)Al_x)_2/Al_2O_3复合材料的制备与强韧化[J]. 稀有金属材料与工程, 2017, 46(1): 150-156 |
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| 作者姓名： | 郭瑞霞 朱高明 王晓虹 牛继南 刘章生 冯培忠 |
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| 作者单位： | 中国矿业大学材料科学与工程学院,中国矿业大学材料科学与工程学院,中国矿业大学材料科学与工程学院,中国矿业大学材料科学与工程学院,中国矿业大学材料科学与工程学院,中国矿业大学材料科学与工程学院 |
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| 基金项目： | 国家自然科学基金资助(51104161); 江苏省‘青蓝工程’资助(苏教师[2012]39号) |
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| 摘 要： | 以Mo、Al、Si和Mo O_34种粉末为原料,通过燃烧合成和真空热压烧结工艺原位制备了(Si_(1-x)Al_x)_2/Al_2O_3复合材料,分析了其燃烧模式、产物相结构、微观组织和力学性能。结果表明:添加Al之后坯体的燃烧合成反应更加剧烈,燃烧模式由螺旋模式转入混沌模式。随着合金化Al含量的增加,基体相结构由C11_b型Mo Si_2转变为C40型Mo(Si,Al)_2,并且在所有复合材料中都可以鉴别出Al_2O_3衍射峰,表明通过燃烧合成技术原位制备了Mo(Si_(1-x)Al_x)_2/Al_2O_3复合材料。复合材料的断裂韧性和抗弯强度最高分别达到4.25 MPa·m~(1/2)和346 MPa,比纯Mo Si_2提高了39%和60%。复合材料的强韧化机制主要有Al合金化强韧化、Al_2O_3第二相颗粒弥散强韧化、玻璃相的消除以及断裂方式的转变。
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| 关 键 词： | 燃烧合成；二硅化钼；复合材料；合金化；力学性能 |
| 收稿时间： | 2014-10-14 |
| 修稿时间： | 2014-10-29 |
Synthesis, Microstructure and Mechanical Properties of Mo(Si1-xAlx)2/Al2O3 Composites |
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| Guo Ruixi,Zhu Gaoming,Wang Xiaohong,Niu Jinan,Liu Zhangsheng and Feng Peizhong. Synthesis, Microstructure and Mechanical Properties of Mo(Si1-xAlx)2/Al2O3 Composites[J]. Rare Metal Materials and Engineering, 2017, 46(1): 150-156 |
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| Authors: | Guo Ruixi Zhu Gaoming Wang Xiaohong Niu Jinan Liu Zhangsheng Feng Peizhong |
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| Affiliation: | School of Materials Science and Engineering, China University of Mining and Technology,School of Materials Science and Engineering, China University of Mining and Technology,School of Materials Science and Engineering, China University of Mining and Technology,School of Materials Science and Engineering, China University of Mining and Technology,School of Materials Science and Engineering, China University of Mining and Technology,School of Materials Science and Engineering, China University of Mining and Technology |
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| Abstract: | Mo(Si1-x,Alx)2/Al2O3 composites were prepared by combustion synthesis and hot-pressing sintering process. The combustion characteristics, phase composition, microstructure and mechanical properties of Mo(Si1-x,Alx)2/Al2O3 composites were investigated. The results show that the combustion synthesis mode, determined by image analysis, is spiral combustion in MoSi2 sample, however, those are chaos combustion in Mo(Si1-x,Alx)2/Al2O3 samples. X-ray diffraction analysis confirms that the main phase composition of combustion products are changed from tetragonal MoSi2 to hexagonal Mo(Si,Al)2 with the increasing of aluminum, and the diffraction peaks of Al2O3 can be identified in Mo(Si1-x,Alx)2/Al2O3 samples. The fracture toughness and bending strength are the maximum for Mo(Si0.90,Al0.10)2/10vol.%Al2O3, 4.25 MPa.m1/2 and 346 MPa, respectively, by a factor of 39% and 60% than the monolith MoSi2. The toughening and strengthening mechanism can be attributed to solid solution of aluminum alloying, alumina particle reinforcement, the remove of glass phase and intergranular fracture. |
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| Keywords: | combustion synthesis molybdenum disilicide composites alloying mechanical properties |
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