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Using high-purity SiC powder as raw material and graphite as pore forming agent, SiC porous prefabricated parts were prepared by combining pre oxidation reaction method. At 1050 ℃ and N2 atmosphere, liquid Al alloy spontaneously infiltrates into the pores formed by the accumulation of SiC particles, resulting in a fully dense high volume content SiCp/Al composite material. The results indicate that the SiO2 film formed by surface oxidation of SiC porous particles is wetted by liquid-solid two-phase reaction through interface reaction during the infiltration of liquid Al. In addition, the content of alloying elements Mg and Si in the Al liquid, as well as the infiltration temperature, also have a significant impact on the wettability of the SiC-Al two phase interface, determining whether the Al alloy liquid can completely and smoothly infiltrate the pores of the SiC porous body. For liquid Al with alloy compositions of Al-6Mg-14Si, the optimal infiltration process is 1050℃ × 6h, with a nitrogen flow rate of 4L/min.

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Preparation and Performance Analysis of SiCp/Al Composite Materials by Non pressure Infiltration Method

  • 会议论文

  • 发表日期：

    2025年

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  • Chenhe Wu,
  • Guangzhe Lv,
  • Enqi Dong,
  • Jialiang Meng,
  • Taozhi Kang,
  • Jiacheng You,
  • Weixi Shi

摘要

Using high-purity SiC powder as raw material and graphite as pore forming agent, SiC porous prefabricated parts were prepared by combining pre oxidation reaction method. At 1050 ℃ and N2 atmosphere, liquid Al alloy spontaneously infiltrates into the pores formed by the accumulation of SiC particles, resulting in a fully dense high volume content SiCp/Al composite material. The results indicate that the SiO2 film formed by surface oxidation of SiC porous particles is wetted by liquid-solid two-phase reaction through interface reaction during the infiltration of liquid Al. In addition, the content of alloying elements Mg and Si in the Al liquid, as well as the infiltration temperature, also have a significant impact on the wettability of the SiC-Al two phase interface, determining whether the Al alloy liquid can completely and smoothly infiltrate the pores of the SiC porous body. For liquid Al with alloy compositions of Al-6Mg-14Si, the optimal infiltration process is 1050℃ × 6h, with a nitrogen flow rate of 4L/min.