SiC繊維(Nicalon)とAlとの界面反応およびZrCバリヤの被覆効果

概要

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The chemical reaction between commercially available SiC fiber (NICALON) and aluminum at elevated temperatures up to 750°C (1, 023 K) has been studied using monofilament composite specimens produced by vacuum deposition of high purity aluminum onto the fiber. The specimens with and without the ZrC barrier coating (SiC/ZrC/Al and SiC/Al) were exposed for 1 hr (3.6 ks) in an ordinary high vacuum to temperatures either below or above the melting point, T<SUB>m</SUB> of aluminum. Specimens SiC/Al degraded considerably once the aluminum was melted; the degradation was such that the surface colour changed from gray to black and the flexible filament became quite brittle. X-ray diffraction revealed the presence of free silicon in the degraded specimens. Such degradation did not occur in specimen SiC/ZrC/A1 unless the temperature was raised far beyond T<SUB>m</SUB>. The fiber coating with ZrC is thus expected to be effective for fabricating a sound composite in this system.
日本複合材料学会の論文