復合材料界面特征
尹衍升3,施忠良4
(1. 北京科技大學 材料科學與工程學院, 北京 100083;
2. 河北科技大學 材料科學與工程學院, 石家莊 050054;
3. 山東大學 材料液態(tài)結構及遺傳性國家教育部重點實驗室,
濟南 250061;
4. 上海交通大學 金屬基復合材料國家重點實驗室,
上海 200030)
摘 要: 界面反應和界面產(chǎn)物對SiCp/Al基復合材料的性能具有重要影響。 對SiCp的高溫氧化行為進行了試驗研究。結果表明:SiCp氧化起始溫度為800~850℃,其氧化增量和氧化產(chǎn)物SiO2的體積分數(shù)及厚度與高溫氧化處理的保溫時間呈拋物線關系。以氧化處理的SiCp為增強體,含Mg鋁合金為基體,通過擠壓鑄造工藝制備復合材料。利用TEM和FE-TEM對所得的復合材料界面進行觀察,結果表明,在SiCp表面形成了一定數(shù)量的尖晶石(MgAl2O4),其數(shù)量和尺寸與Mg含量有關。由此, 通過控制SiCp的氧化處理工藝參數(shù)和基體合金成分,可以實現(xiàn)對SiCp/Al基復合材料界面反應及產(chǎn)物的控制。
關鍵字: SiC顆粒增強金屬基復合材料;SiC顆粒氧化處理;界面
their interfacial characterization in aluminum matrix composites
YIN Yan-sheng3, SHI Zhong-liang4
(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


