激光熔铸多壁纳米碳管增强铝基复合材料

Muti-walled carbon nanotubes reinforced aluminum matrix composites prepared by laser casting

关键词:  纳米碳管  激光熔铸  铝合金  复合材料

Key words:  carbon nanotubes  laser casting  aluminum matrix alloy  composites

摘要:

利用激光熔铸技术制备多壁纳米碳管增强铝基复合材料,并使用SEM、XRD对其熔铸成形性以及纳米碳管与基体金属界面结合行为进行观察和分析。结果表明,在单位面积激光能量为800×10⁵ J/m²时,纳米碳管增强铝基复合材料能够熔合而不破坏纳米碳管结构;在该复合材料中适量添加表面张力较低的金属Mg,可降低基体铝的表面张力,进而降低铝一纳米碳管的液固界面能,改善铝合金和纳米碳管的润湿性;当纳米碳管含量为5%(质量分数)时,并添加3%(质量分数)合金化元素Mg,激光熔铸的复合材料熔合性较好,铸块致密,在复合铸块的断口上能观察到增强体纳米碳管。

Abstract:

Multi-walled carbon nanotubes reinforced aluminum matrix composites was prepared by laser casting.Transmission electron microscopy,scanning electron microscopy and X-ray diffraction have been carried out to observe and analyze the forming quality and interfacial bonding behavior between carbon nanotubes and aluminum matrix.The results show that multi-welled carbon nanotubes reinforced aluminum matrix composites can fuse without the damage of carbon nanotubes structure when the laser energy input was 800×10⁵J/m².The matrix alloying element Mg can decrease the surface energy of matrix,and improve the wettability and interfacial bonding between carbon nanotubes and aluminum matrix.With the addition of 3 wt% Mg and 5 wt% carbon nanotubes,the casting quality of composites was enhanced.In the composites crack profile,pull-out carbon nanotubes from aluminum matrix were observed.