Tensile Characteristics of Silicon Carbide Fiber in Fabrication Process of FRM by Liquid Infiltration Method : Part 1; Strength and Fracture Mode

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The present paper deals with the tensile strength and fracture mode of SiC fiber exposed to a hydrostatic pressure, isothermal heating and liquid aluminum environment. These conditions are sometimes encountered in FRM fabrication by a liquid infiltration method. The results of the tensile-test showed no fiber degradation in a given isothermal heating and hydrostatic pressurizing, but the fiber exposed to the liquid aluminum environment degraded with an increasing exposure time. And a fractgraphic observation revealed the following. As for the original fiber, the isothermally heated fiber and the hydrostatically pressurized fiber, the cracking occurred from the inner defect of the fiber or from the surface defects. Most of the fibers failured by the inner defect are stronger than those by the surface defect. On the other hand, for the liquid aluminum exposure the fibers which the fracture originates from the reaction product formed on the fiber surface with the aluminum increased in number as the exposure time increased, and after 2min exposure all the fibers fractured by the reaction product.
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