Liquid metal infiltration of silicon based alloys into porous carbonaceous materials Part-III: Experimental verification of conversion products and infiltration depth by infiltration of Si-Zr alloy into mixed SiC/graphite preforms |
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Affiliation: | 1. Empa – Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland;2. Laboratory of Mechanical Metallurgy, Ecole Polytechnique F´ed´erale de Lausanne, EPFL, Lausanne, Switzerland;3. Scuola universitaria professionale della Svizzera italiana, Lugano, Switzerland |
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Abstract: | Porous carbonaceous preforms, made from graphite and silicon carbide (SiC) powders, with varying graphite powder mass fractions and particle sizes, were infiltrated at 1500 °C and 1700 °C by Si-8 at. pct Zr alloy to produce dense Si-Zr-SiC composites. The experiments were performed in a graphite chamber vacuum furnace at 10?2 mbar. The most desirable results were obtained for preforms composed of a mixture of graphite and SiC powders, with preforms containing 15–20 % mass fraction of graphite and infiltrated at 1500 °C. The banding of the Zr-rich phase observed in the cross-sections of SiC-C pre- forms infiltrated by the Si-Zr alloy may help in decoding the reactive infiltration process with binary alloys. |
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Keywords: | LSI RMI SiC composites Si-Zr alloy infiltration |
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