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Microstructures and properties of Al2O3/ Al-AlN composites by Pressureless Infiltration of Al-alloys

机译:铝合金无压浸渗Al2O3 / Al-AlN复合材料的组织与性能

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摘要

Al alloys were infiltrated into Al2O3 preforms in N2 and N2- 2% H2 gas mixture in the temperature regime of 900-1200°C. The kinetics of nitridation during infiltration were continuously monitored by recording weight gained during infiltration of the preform. The weight gains that are attributed to the formation of AlN in the matrix were observed to increase with processing temperature. In addition, higher weight gains were recorded in N2-H2 as compared to in N2 atmosphere. Analysis of the composites indicates that controlled matrices of AlN/Al can be formed by selection of appropriate process parameters viz. temperature and atmosphere. Based on this study it has been demonstrated that net shaped metal matrix composites (MMCs), with varying amounts of AlN in the matrix can be fabricated by infiltrating alumina preforms at $900-1000^oC$ in commercial nitrogen. By controlling the preform characteristics, it is possible to fabricate composites with significant variation in microstructural scale, and consequently matrix hardness and elastic modulus.
机译:在900-1200°C的温度范围内,铝合金在N2和N2- 2%H2气体混合物中渗入Al2O3预成型坯中。通过记录预成型坯在渗入过程中获得的重量,连续监测渗入过程中的氮化动力学。观察到归因于基体中AlN形成的重量增加随加工温度的增加而增加。另外,与在N 2气氛中相比,在N 2 -H 2中记录了更高的重量增加。复合材料的分析表明,可以通过选择适当的工艺参数来形成受控的AlN / Al矩阵。温度和气氛。根据这项研究,已经证明可以通过在商业氮气中以900-1000°C $的价格渗透氧化铝预成型件来制造基质中AlN含量不同的网状金属基质复合材料(MMC)。通过控制预成型件的特性,可以制造出微观结构尺寸变化显着,从而基体硬度和弹性模量变化显着的复合材料。

著录项

  • 作者

    Nagendra N; Rao BS; Jayaram V;

  • 作者单位
  • 年度 1999
  • 总页数
  • 原文格式 PDF
  • 正文语种 {"code":"en","name":"English","id":9}
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