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首页> 外文期刊>RSC Advances >Improved properties of Al–Si3N4 nanocomposites fabricated through a microwave sintering and hot extrusion process
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Improved properties of Al–Si3N4 nanocomposites fabricated through a microwave sintering and hot extrusion process

机译：通过微波烧结和热挤压工艺制备的Al–Si 3 N 4 纳米复合材料的改进性能

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In this study, nano-sized Si3N4 (0, 0.5, 1.0 and 1.5 vol%)/Al composites were fabricated using a powder metallurgy method involving microwave sintering technique followed by hot extrusion. The influence of Si3N4 content on the structural, mechanical and thermal behaviour of Al–Si3N4 nanocomposites was systematically investigated. Electron microscopy examination reveals the uniform distribution of hard Si3N4 nanoparticles in the soft Al matrix. The compressive and tensile strengths of Al composites increased with the increase of Si3N4 content while the ductility decreased. The thermal expansion coefficient of the Al composite decreased with the progressive addition of hard Si3N4 nanoparticles. Overall, hot extruded Al–1.5 vol% Si3N4 nanocomposites exhibited the best combination of tensile, compressive, hardness, Young's modulus and thermal properties of 191 ± 4 MPa, 412 ± 3 MPa, 16.3 ± 0.8 GPa, 94 ± 2 GPa and 19.3 μ K?1, respectively. Tensile tests performed at 200 °C revealed that the tensile strength reduced by ～35% when compared to the strength at room temperature. The strength, however, was still higher compared to that of the pure Al at 200 °C. The major enhancement in the strength of the nanocomposites is primarily attributed to the presence of uniformly distributed nano-sized Si3N4 nanoparticles in the Al matrix.
机译：在这项研究中，纳米尺寸的Si 3 N 4 （0、0.5、1.0和1.5 vol％） / Al复合材料是采用粉末冶金法制造的，该方法涉及微波烧结技术，然后进行热挤压。 Si 3 N 4 含量对Al–Si 3 N 4 纳米复合材料。电子显微镜检查表明，硬质Si 3 N 4 纳米颗粒在软质Al基体中均匀分布。随着Si 3 N 4 含量的增加，Al复合材料的抗压强度和拉伸强度增加，而延展性下降。随着硬Si 3 N 4 纳米颗粒的逐渐添加，Al复合材料的热膨胀系数降低。总体而言，热挤压的Al–1.5 vol％Si 3 N 4 纳米复合材料表现出拉伸，压缩的最佳组合，硬度，杨氏模量和热性能分别为191±4 MPa，412±3 MPa，16.3±0.8 GPa，94±2 GPa和19.3μK ？1 。在200°C下进行的拉伸试验表明，与室温下的强度相比，拉伸强度降低了约35％。但是，强度在200°C时仍比纯Al更高。纳米复合材料强度的主要提高主要归因于均匀分布的纳米Si 3 N 4 < Al基体中的纳米颗粒。

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