CAJ | 학술논문

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%。
채용반응소결화용체초성분산법,이 Si O 2위원료성공제비료 Al2 O3과립증강려기복합재료。이용X사선연사의、차열분석의、소묘전경、능보의등분석료복합재료적현미조직、생성적과립이급과립적형모、척촌화과립적분포。이용전자식만능시험궤진행실온랍신실험。결과표명,재800℃하,경과8 h 소결후적배괴중SiO2완전반응생성료단취적 Al2 O3과립,Al2 O3과립립도약위1μm。재용체중시가1.0 kW/cm2적고능초성사배괴용화,획득적복합재료중Al2 O3과립분포균균,과립척촌기본몰유변화；복합재료적항랍강도110.6 MPa,교순려기체적92.0 MPa,제고료20.2%。
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).