复合材料界面特征
(1. 北京科技大学 材料科学与工程学院, 北京 100083;
2. 河北科技大学 材料科学与工程学院, 石家庄 050054;
3. 山东大学 材料液态结构及遗传性国家教育部重点实验室,
济南 250061;
4. 上海交通大学 金属基复合材料国家重点实验室,
上海 200030)
摘 要: 界面反应和界面产物对SiCp/Al基复合材料的性能具有重要影响。 对SiCp的高温氧化行为进行了试验研究。结果表明:SiCp氧化起始温度为800~850℃,其氧化增量和氧化产物SiO2的体积分数及厚度与高温氧化处理的保温时间呈抛物线关系。以氧化处理的SiCp为增强体,含Mg铝合金为基体,通过挤压铸造工艺制备复合材料。利用TEM和FE-TEM对所得的复合材料界面进行观察,结果表明,在SiCp表面形成了一定数量的尖晶石(MgAl2O4),其数量和尺寸与Mg含量有关。由此, 通过控制SiCp的氧化处理工艺参数和基体合金成分,可以实现对SiCp/Al基复合材料界面反应及产物的控制。
关键字: SiC颗粒增强金属基复合材料;SiC颗粒氧化处理;界面
their interfacial characterization in aluminum matrix composites
(1. School of Materials Science and Engineering,
University of Science and Technology Beijing, Beijing 100083, China;
2. School of Materials Science and engineering,
Hebei University of Science and Technology, Shijiazhuang 050054, China;
3. Key Laboratory of Education Ministry for Liquid Structure &
Heridity of Materials, Shandong University,
Ji′nan 250061, China;
4. State Key Laboratory of Metal Matrix Composites,
Shanghai Jiaotong University,Shanghai 200030, China)
Abstract:Interface actions and their products are critical to composite materials. Investigation on SiCp oxidation at elevated temperatures shows that the oxidation increment of SiCp, the dependence of the volume fraction and that of the thickness of SiO2 layer on temperature are both parabolic. Investigation on the interfacial microstructure of the oxidized SiCp/Al-Mg alloy composites made up by squeeze casting shows that MgAl2O4 forms on the surface of SiCp , the quantity and size of MgAl2O4 are related to Mg content in the matrix. The interface actions and their products of SiCp/Al-Mg composites can be controlled via SiCp oxidation technical parameters and Mg content.
Key words: SiCp reinforced Al-matrix composite; oxidation of SiCp; interface