表面酸化被覆層によるSi-Ti-C-O系繊維の熱分解抑制に及ぼす酸素濃度の影響

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The pyrolysis of two types of alnorphous Si-Ti-C-O fibers (Tyranno T-1 (18%0) and T-2 (13%0) coated with oxide layers of various thicknesses was investigat ed ill an argon stream at 1673 K. The oxide layers thick nesses of 0.12, 0.21, 0.42 and 0.65 μm were formed on the surface of the fibers by the heat treatment in an oxy gen stream at 1673 K. The fibers with oxide layers of various thicknesses were heated rapidly at 1673 K and kept at this temperature in an argon stream continuous ly monitoring the weight change with a thermoba lance. After cooling the crystal structure and morpholo gy of the fibers were examined with X ray diffraction and SEM observation, respectively. The pyrolysis of all T-2 fibers with oxide layers of the above thicknesses was suppressed significantly. On the other hand, the T-1 fiber with an oxide layer 0.12 μm thick pyrolyzed counpletely, and growih and coalescence of β SiC crys tal were observed. The pyrolysis of the T-1 fiber with oxide layers of 0.21, 0.42 and 0.65 μm thick was sup pressed siguificantly, and this pyrolytic behavior was sirnilar to that of the T-2 fiber. The oxide layer of fibers was removed by chernical etching treatment, then the microstructure of the etched fibers was ob served with TEM and their tensile strength was meas ured at room temperature. As the thickness of oxide layer decreased, crystallization of β-SiC in the fiber was inhibited and the tensile strength of the fiber in creased. At the same thickness of oxide layer, the ten sile strength of the T-2 fiber was larger than that of the T-1 fiber.
社団法人日本セラミックス協会の論文
1994-05-01

表面酸化被覆層によるSi-Ti-C-O系繊維の熱分解抑制に及ぼす酸素濃度の影響

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