| 초록 |
Phenolic resin matrix was modified by addition of inorganic powders molybdenum disilicide (MoSi2) in different proportions, i.e. 0, 4, 12 and 20% by weight. The matrix was used to develop carbon fiber reinforced composites heat treated to 1100 and 2300℃, respectively. The hybrid effect of MoSi2 having the physical properties of oxidation inhibition and brittle-to-ductile transition (BDT) at higher temperatures was ascertained by measuring the degree of graphitization, flexural strength and interlaminar shear strength of the composites. As a result, the flexural strength of graphitized composites showed a remarkable increase from 200MPa for 0wt.% to 360MPa for 12∼20wt.% MoSi2 concentrations. The increase in flexural strength was probably due to the increase of bulk density or decrease of open porosity and the development of large numbers of grain boundaries.
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