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

doi:10.3724/SP.J.1077.2012.00353

Abstract

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 SiC_p/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

CLC Number:

TB331

ZHANG Qiang, JIANG Long-Tao, WU Gao-Hui. Fabrication of Oxidized SiC Particles Reinforced Aluminum Matrix Composite by Pressureless Infiltration Technique[J]. Journal of Inorganic Materials, 2012, 27(4): 353-357.

Figures/Tables 6

Fig. 1 Variation in weight gain of SiC particles with oxidation time at different oxidation temperatures

Fig. 2 Relationship between lnK and 1/T

Fig. 3 Backscattering image of SiCp/Al composite

Fig. 4 TEM images of as-cast SiCp/Al composite

Fig.5 XRD pattern for the particles extracted from SiCp/Al composite

Fig. 6 SEM morphologies of pre-oxidized SiC and particles extracted from composite

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