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首页> 外文会议>High temperature ceramic matrix compositei III >Thermal Stability of Glass-Sealed Si-Ti-C-O Fiber Reinforced SiC Composite
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Thermal Stability of Glass-Sealed Si-Ti-C-O Fiber Reinforced SiC Composite

机译：玻璃密封的Si-Ti-C-O纤维增强SiC复合材料的热稳定性

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摘要

Thermal stability of glass-sealed Si-Ti-C-0 fiber reinforced SiC composite was investigated by exposed at 1200℃ for 200 hours in air. The composite consisted of 40 vol% 3-D surface-modified Si-Ti-C-O fabric and SiC matrix formed by polymer impregnation and pyrolysis (PIP) method. The surface of the composite was glass(SiO_2-Na_2O)-sealed using a proprietary technique, which is not costly method, for improving oxidation resistance of the composite. After the exposure, the flexural strength at room temperature retained nearly 90% of the strength of the as-fabricated, exhibiting fiber pull-out and crack-deflection. The flexural strength of the exposed composite at 1200℃ in air decreased to less than half of the strength of the as-fabricated, however, re-seal of the glass after the exposure was effective and the flexural strength of the re-sealed composite at 1200℃ in air improved to 80% of the strength of the as-fabricated. These results indicated the glass-sealed Si-Ti-C-O fiber reinforced SiC composite could be applicable to components which serve at high temperatures in air.
机译：通过将玻璃密封的Si-Ti-C-0纤维增强的SiC复合材料在1200℃下暴露于空气中200小时来研究其热稳定性。该复合材料由40％（体积）的3-D表面改性Si-Ti-C-O织物和通过聚合物浸渍和热解（PIP）方法形成的SiC基体组成。为了提高复合材料的抗氧化性，使用一种成本不高的专有技术对复合材料的表面进行了玻璃（SiO_2-Na_2O）密封处理。暴露后，室温下的挠曲强度保持了所制造强度的近90％，表现出纤维拉出和裂纹变形。暴露在空气中的复合材料在1200℃时的弯曲强度降低到不足刚加工强度的一半，但是，暴露后玻璃的重新密封有效，并且在1200°C下重新密封的复合材料的弯曲强度空气中的1200℃强度提高到了所制造强度的80％。这些结果表明，玻璃密封的Si-Ti-C-O纤维增强的SiC复合材料可适用于在空气中高温下工作的部件。

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