Korea Advanced Institute of Science and Technology

Kyung Yoon Jeon

Soon Hyung Hong

Hyo Soo Lee

Disclosed is a method for producing an SiC preform of a high volume fraction used for the manufacture of a metal matrix composite. The method involves the steps of mixing SiC particles of different particle sizes each selected from a range of 0.2 to 48 &mgr;m with an organic binder, an inorganic binder, an aggregating agent, and distilled water, thereby producing a mixture, and stirring the mixture in accordance with a ball milling process, thereby producing a slurry containing the SiC particles, pouring the slurry containing the SiC particles into a mold having upper and lower molds respectively provided with absorbent bodies, and squeezing the slurry in the mold, thereby reducing a residual moisture content of the slurry, completely drying the slurry reduced in residual moisture content, thereby producing an SiC preform, and calcinating the SiC preform. The preform is impregnated with a metal matrix while maintaining a high reinforcement volume fraction of 70 vol % or more. Accordingly, this preform can be widely used for fundamental materials of metal matrix composites used to manufacture electronic packaging components and aerospace components requiring a low thermal expansion coefficient and a high thermal conductivity.

Method for producing SiC preform with high volume fraction

The present invention relates to a method of preparing a preform with a high volume fraction of SiC particles. A slurry containing SiC particles and binders is ball-milled and pressed in an apparatus to give a primary preform. This primary preform is dried at room temperature and then, at a high temperature. The dried primary preform is subjected to calcination to prepare the preform. In the apparatus, which comprises a bottom die; a top mold with a cavity, placed on the bottom die, an upper punch for pressing a material for the preform in the cavity; and two water-absorbers, one being inserted between the bottom die and the top mold, the other being placed on the top mold, the slurry is introduced in the cavity and pressed by the punch while the water is absorbed in the absorbers or drained through a gap between the bottom die and the top mold, thereby improving the volume fraction of SiC particles. The preform can be used as a fundamental material in producing metal matrix composites having a high thermal conductivity and a low coefficient of thermal expansion, suitable for the application for, e.g., electronic packaging and space-air structures.

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Pusan Kwangyeok-si, South Korea

Kyung Yoon Jeon