无机材料学报 ›› 2012, Vol. 27 ›› Issue (4): 353-357.DOI: 10.3724/SP.J.1077.2012.00353 CSTR: 32189.14.SP.J.1077.2012.00353

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无压浸渗法制备氧化态SiC颗粒增强铝基复合材料

张 强, 姜龙涛, 武高辉   

  1. (哈尔滨工业大学 材料科学与工程学院, 哈尔滨150001)
  • 收稿日期:2011-04-16 修回日期:2011-05-30 出版日期:2012-04-10 网络出版日期:2012-03-12
  • 基金资助:
    教育部留学回国人员科研启动基金

Fabrication of Oxidized SiC Particles Reinforced Aluminum Matrix Composite by Pressureless Infiltration Technique

ZHANG Qiang, JIANG Long-Tao, WU Gao-Hui   

  1. (School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)
  • Received:2011-04-16 Revised:2011-05-30 Published:2012-04-10 Online:2012-03-12
  • Supported by:
    Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry

摘要:

研究了SiC颗粒在1000~1200℃的氧化行为, 其氧化增重率与保温时间符合抛物线规律, 氧化增重受扩散过程控制, 氧化激活能为219 kJ/mol. 采用预氧化处理的SiC颗粒为增强体, 含Si、Mg的铝合金为基体, 通过无压浸渗方法制备了SiCp/Al复合材料, 分析了复合材料的微观组织与界面形貌, 探讨了无压浸渗机理. 复合材料中颗粒分布均匀, 无偏聚现象. 材料制备过程中存在界面反应, SiC颗粒表面的氧化层与铝合金中的Mg、Al反应形成了一定数量的MgAl2O4. 界面反应的存在提高了润湿性, 促进了无压自发浸渗.

关键词: SiC颗粒, 氧化, 无压浸渗, 界面反应

Abstract:

The oxidation behavior of SiC particles in the temperature range from 1000℃ to 1200℃ was investigated. The dependence of weight gain and oxidation time was parabolic and the oxidation behavior was controlled by diffusion process, with a oxidation activation energy of 219 kJ/mol. Using oxidized SiC particles as reinforcement and aluminum alloy containing Si and Mg as matrix, a SiCp/Al composite was fabricated by pressureless infiltration technique. The microstructure and interfacial morphology were analyzed and the pressureless infiltration mechanisms were discussed. The particles were distributed uniformly in the composite, without particles agglomeration. Interfacial reactions were found in the composite and the product was identified as MgAl2O4, formed by the reactions between surface oxide layer of SiC particles and Mg, Al in the matrix. The interfacial reactions enhanced the wettability and promoted the spontaneous infiltration process.

Key words: SiC particles, oxidation, pressureless infiltration, interfacial reaction

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