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        Al-SiCp 복합재료에서 SiCp 의 용해거동에 관한 연구

        김석원,이의권,전우용 ( Sug Won Kim,Eui Kweon Lee,Woo Yeoung Jeon ) 한국주조공학회 1993 한국주조공학회지 Vol.13 No.4

        N/A Aluminum base composites reinforced with various amount of SiC particles and Mg contents have been investigated by different fabrication method for twenty-years. In this paper, how the decomposition and dissolution behaviors of SiCp(20㎛) in the melt of Al composites arised was studied. As the results, the decomposition and dissolution of SiCp into the melt of Al composites increased with increase of the temperature above 720℃, and holding time at a given melting temperature. Because SiC is thermodynamically unstable in this Al-SiCp composite at temperature above the liquidus, SiCp dissolves and reacts with Al in matrix to form Al₄C₃according to following chemical equation 4Al+3SiC→Al₄C₃+3Si, Si decomposed and dissolved from SiCp increases Si content of matrix, while liquidus temperature of matrix decrease with increase of SiC content in matrix. The hardness of SiCp decreased with increase of the melting temperature, the hardness of the matrix /particle interface increased with increase of the melting temperature due to increase of the Mg₂Si and Al₄C₃intermetallic compounds, etc.

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        Al-Si / SiCp 복합조직에 미치는 Rheo-compocasting 의 제조조건 및 Mg 첨가의 영향

        김석원,이의권,전우용 ( Sug Won Kim,Eui Kweon Lee,Woo Yeoung Jeon ) 한국주조공학회 1993 한국주조공학회지 Vol.13 No.6

        N/A Dispersion behaviors of SiC particles and microstructures in Al-2%Si/SiCp composite prepared by Rheo-compocasting were studied with change of fabrication conditions(slurry temperature, agitation time) and additions of Mg(0∼3wt.%). Also, the microhardness change of matrix, interface and total in composites were examined with additions of Mg (0∼3wt.%). The dispersion of particles in the composites became relatively homogeneous with increase of Mg additions, agitation time and decrease of slurry temperature. Rate of occupied area by particle in matrix was increased as increase of Mg additions due to improvement of wettability between SiC particle and matrix. A favorable composites were obtained by melting under Ar atmospheric SiCp injection and bottom pouring system. According to the analysis of X-ray diffraction, Mg₂Si, Al₄C₃, SiO₂and MgO, etc, intermetallic compounds were formed by chemical interreaction at interface of matrix and particles. The microhardness of interface is higher than that of matrix due to more strengthening of above intermetallic compounds. It was considered that the total hardness of the composites is improved by dispersing of SiCp and addition of Mg.

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