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Mo(Si1-xAlx)2/Al2O3復(fù)合材料的制備與強(qiáng)韌化
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中國礦業(yè)大學(xué)材料科學(xué)與工程學(xué)院,中國礦業(yè)大學(xué)材料科學(xué)與工程學(xué)院,中國礦業(yè)大學(xué)材料科學(xué)與工程學(xué)院,中國礦業(yè)大學(xué)材料科學(xué)與工程學(xué)院,中國礦業(yè)大學(xué)材料科學(xué)與工程學(xué)院,中國礦業(yè)大學(xué)材料科學(xué)與工程學(xué)院

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TB383

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國家自然科學(xué)基金資助(51104161); 江蘇省‘青藍(lán)工程’資助(蘇教師[2012]39號(hào))


Synthesis, Microstructure and Mechanical Properties of Mo(Si1-xAlx)2/Al2O3 Composites
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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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    摘要:

    以Mo、Al、Si和MoO3四種粉末為原料，通過燃燒合成和真空熱壓燒結(jié)工藝原位制備了Mo(Si1-x,Alx)2/Al2O3復(fù)合材料，分析了燃燒模式、產(chǎn)物相結(jié)構(gòu)、微觀組織和力學(xué)性能。結(jié)果表明：添加Al之后坯體的燃燒合成反應(yīng)更加劇烈，燃燒模式由螺旋模式轉(zhuǎn)入混沌模式，隨著合金化Al含量的增加，基體相結(jié)構(gòu)由C11b型MoSi2轉(zhuǎn)變?yōu)镃40型Mo(Si,Al)2，并且在所有復(fù)合材料中都可以鑒別出Al2O3衍射峰，表明通過燃燒合成技術(shù)原位制備了Mo(Si1-x,Alx)2/Al2O3復(fù)合材料。復(fù)合材料的斷裂韌度和彎曲強(qiáng)度最高分別達(dá)到4.25MPa.m1/2和346MPa，比純MoSi2提高了39%和60%。復(fù)合材料的強(qiáng)韌化機(jī)制主要有Al合金化強(qiáng)韌化、Al2O3第二相顆粒彌散強(qiáng)韌化、玻璃相的消除以及斷裂方式的轉(zhuǎn)變。

    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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郭瑞霞,朱高明,王曉虹,牛繼南,劉章生,馮培忠. Mo(Si1-xAlx)2/Al2O3復(fù)合材料的制備與強(qiáng)韌化[J].稀有金屬材料與工程,2017,46(1):150~156.[Guo Ruixia, Zhu Gaoming, Wang Xiaohong, Niu Jinan, Liu Zhangsheng, 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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  • 收稿日期:2014-10-14
  • 最后修改日期:2014-10-29
  • 錄用日期:2014-12-03
  • 在線發(fā)布日期: 2017-03-16
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