【摘要】 对SiCp进行高温氧化处理,采用粉末冶金法制备SiC颗粒增强A390复合材料。使用扫描电镜(SEM)、透射电镜(TEM)、X射线衍射(XRD)和X射线光电子谱(XPS)对SiCp表面状态和SiCp/A390复合材料微观组织进行了表征,测定了复合材料的致密度和抗拉强度,研究了SiCp表面状态及SiCp预处理对复合材料组织与性能的影响。结果表明:高温氧化处理不仅可以改变SiC颗粒形貌,还能使SiC颗粒表面形成一层致密氧化层;高温氧化处理提高了SiCp在SiCp/A390复合材料中的分散均匀性,使SiCp/A390复合材料的抗拉强度、致密度等显著提高;并讨论了SiC颗粒的氧化机理及复合材料的强化机制。更多还原

【Abstract】 SiC particles were pre-treated by high temperature oxidation. SiC particles reinforced A390 aluminium matrix composite materials were prepared by powder metallurgy method. The SiC particles with and without pretreatment were examined by means of scanning electron microscopy( SEM),transmission electron microscopy( TEM),X-ray diffraction( XRD) and X-ray photoelectron spectroscopy( XPS). Microstructure of the SiCp / A390 composites was characterized,and the density and tensile strength of the SiCp /A390 Al composites were measured. The influence of the pretreatment of SiC particles on microstructure and properties of SiCp / A390 Al composites was researched. The results show that the morphology of the SiC particles is changed and a compact oxide layer on the surface of the SiC particles is generated by high temperature oxidation treatment. The dispersion uniformity of SiC particles in the SiCp / A390 Al composites reinforced by the oxided SiC particles is improved. The compactness and tensile strength of the SiCp / A390 composites are increased significantly after the pretreatment of the SiC particles. The mechanism of oxidation of SiC particles and strengthening mechanism of the composite materials are discussed.更多还原