采用反应烧结和熔体超声分散法,以 Si O 2为原料成功制备了 Al2 O3颗粒增强铝基复合材料。利用X射线衍射仪、差热分析仪、扫描电镜、能谱仪等分析了复合材料的显微组织、生成的颗粒以及颗粒的形貌、尺寸和颗粒的分布。利用电子式万能试验机进行室温拉伸实验。结果表明,在800℃下,经过8 h 烧结后的坯块中SiO2完全反应生成了团聚的 Al2 O3颗粒,Al2 O3颗粒粒度约为1μm。在熔体中施加1.0 kW/cm2的高能超声使坯块熔化,获得的复合材料中Al2 O3颗粒分布均匀,颗粒尺寸基本没有变化；复合材料的抗拉强度110.6 MPa,较纯铝基体的92.0 MPa,提高了20.2%。
Reaction sintering and ultrasonic treatment were used to synthesize Al2 O3 particles reinforced alumi-num matrix composites from SiO2 powder.Microstructure of the composite,the morphology and the size of the particles as well as the particles distribution in the as-prepared composites were investigated by X-ray diffrac-tion,differential thermal analysis,scanning electron microscope,and energy dispersive spectroscopy.Electron-ic universal testing machine was used for room-temperature tensile experiment.It was shown that Al2 O3 parti-cles,which were about 1 μm in size,have been obtained and aggregate in the compact sintered at 800 ℃ for 8 h.Composites with uniformly-distributed Al2 O3 particles were obtained by dissolving the as-sintered compact in liquid aluminum under high-energy ultrasound with a power of 1.0 kW/cm2 .The size of Al2 O3 particles after dissolving almost had no change.The tensile strength of the composite was 110.6 MPa,which was increased by 20.2% compared with pure aluminium (92.0 MPa).
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