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超重力场辅助燃烧合成钼铜功能梯度材料
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中国科学院理化技术研究所 低温工程学重点实验室,中国科学院理化技术研究所 低温工程学重点实验室,中国科学院理化技术研究所 低温工程学重点实验室,中国科学院理化技术研究所 低温工程学重点实验室

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国家重点研发计划专项(项目号:2016YFB0700204)和 国家自然科学基金资助(项目号:51432004、51401225、51372255)


Fabrication of Mo–Cu functionally graded material by combustion synthesis and centrifugal infiltration
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Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences,,Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences,Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences

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The National Key Research and Development Program of China (No. 2016YFB0700204) and NSFC (Nos. 51432004, 51401225, 51372255)

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    摘要:

    采用超重力场辅助燃烧合成的方法制备了钼铜功能梯度材料。燃烧合成生成的Cu熔体在1000g超重力场作用下渗透进入Mo粉坯中,随着熔体温度降低及渗透压力减小,沿超重力场方向上形成组分梯度分布的钼铜功能梯度材料。采用X射线衍射(XRD)、扫描电子显微镜(SEM)对样品沿超重力场方向的物相组成和微观形貌进行表征,利用激光闪射法、维氏硬度计对样品沿超重力场方向的热扩散系数的硬度值进行测试。结果表明:样品沿超重力场方向钼铜合金组分渐变,Mo含量由75wt.%减小至40wt.%,相对密度相应的由97.6%降低至96.5%。相对密度的降低可能是由于沿超重力场方向Cu熔体冷却体积收缩增大造成的。钼铜功能梯度沿超重力场方向的热扩散系数由43.2 mm2 s-1增加至66.6 mm2 s-1,硬度值由1390MPa逐渐减小至710MPa。

    Abstract:

    Mo–Cu functionally graded material was fabricated by a method which combines combustion synthesis with centrifugal infiltration. During the process, Cu melt produced by combustion reaction was infiltrated into a homogeneous Mo powder bed under high gravity. The as-prepared sample showed gradually-varying properties in terms of relative density, thermal diffusion coefficient and hardness. The content of heavy Mo phase decreases gradually from 75 to 40 vol.% along high gravity direction. The relative density of Mo–Cu FGM decreases from 97.6 to 96.5%, which can be attributed primarily to the increase in shrinkage cavity along high gravity direction. The thermal diffusion coefficient of Mo–Cu FGM increases from 43.2 to 66.6 mm2 s-1 due to the increase in Cu content along high gravity direction. The hardness of Mo–Cu FGM decreases gradually from 1390 to 710 MPa, as the content of Cu and porosity increases along high gravity direction.

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贺刚,刘家希,鲁楠,李江涛.超重力场辅助燃烧合成钼铜功能梯度材料[J].稀有金属材料与工程,2018,47(S1):307~310.[He Gang, Liu Jiaxi, Lu Nan, Li Jiangtao. Fabrication of Mo–Cu functionally graded material by combustion synthesis and centrifugal infiltration[J]. Rare Metal Materials and Engineering,2018,47(S1):307~310.]
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  • 收稿日期:2017-07-03
  • 最后修改日期:2017-07-03
  • 录用日期:2018-01-29
  • 在线发布日期: 2018-10-22
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