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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。
SiCp high temperature oxidation treatment, the use of powder metallurgy prepared SiC particles reinforced A390 composite. The surface state of SiCp and the microstructure of SiCp / A390 composites were characterized by SEM, TEM, XRD and XPS. The densification And tensile strength, the effect of SiCp surface condition and SiCp pretreatment on the microstructure and properties of the composites were studied. The results show that high temperature oxidation can not only change the morphology of SiC particles, but also form a dense oxide layer on the surface of SiC particles. High temperature oxidation improves the uniformity of SiCp dispersion in SiCp / A390 composites, The tensile strength and the density of the material are obviously improved. The oxidation mechanism of the SiC particles and the strengthening mechanism of the composite material are also discussed.