TENSILE-STRENGTH AND MORPHOLOGICAL INVESTIGATION OF SIC-COATED CARBON-FIBERS

SiC-coated film onto carbon fibers as a barrier of oxidation resistanc e and reaction between carbon fibers and metals was investigated. The chemical vapor deposition of silicon carbide onto carbon fibers was pe rformed at various temperatures ranging from 700 to 1000 degrees C usi ng triisopropylsilane vapor carried by hydrogen gas. The strength of t he SiC-coated carbon fibers was decreased due to deterioration of fibe rs and chemical attack of hydrogen on the surface of carbon fibers dur ing the coating process. The oxidation and the thermal resistance of t he SiC-coated carbon fibers compared to the uncoated carbon fibers wer e improved at temperature range of 600-800 degrees C and 1000-1200 deg rees C, respectively. Morphological change by air oxidation at tempera ture range of 500-800 degrees C was also investigated for the SiC-coat ed and the uncoated carbon fibers, respectively. The SiC-coated film b etween carbon fiber and aluminum was sufficient as a barrier of reacti on on carbon fiber reinforced aluminum al temperature of above 1000 de grees C.