Properties of Si3N4 Produced by Nitriding Slip-Cast Si Containing Si3N4 Grog Additions |
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Authors: | RobertM Williams Andre Ezis John C Caverly GY Onoda |
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Affiliation: | Contributing;Editor Ford Motor Co., Dearbom, Michigan 48121 |
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Abstract: | The properties of Si3N4 compositions produced by nitriding slip-cast Si bodies containing up to 16% Si3N4 grog were determined. The introduction of grog consistently lowered the densities, the room- and high-temperature strengths, and the resistance to oxidation. The open structure of the grog-containing mixes favored low-temperature gas-phase reactions leading to α-Si3N4 formation. In higher-density compositions containing predominantly Si, gas-liquid-solid reactions at higher temperatures produced a relatively greater content of the β phase. |
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