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Reaction‐Bonding Preparation of Si 3 N 4 /MoSi 2 and Si 3 N 4 /WSi 2 Composites from Elemental Powders
Author(s) -
Zhang BingRong,
Marino Francesco
Publication year - 1997
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1997.tb02825.x
Subject(s) - materials science , base (topology) , x ray crystallography , atmosphere (unit) , diffraction , max phases , nitriding , composite material , metallurgy , crystallography , chemistry , carbide , layer (electronics) , mathematical analysis , physics , mathematics , optics , thermodynamics
Si 3 N 4 /MoSi 2 and Si 3 N 4 /WSi 2 composites were prepared by reaction‐bonding processes using as starting materials powder mixtures of Si‐Mo and Si‐W, respectively. A presintering step in an At‐base atmosphere was used before nitriding for the formation of MoSi 2 and WSi 2 ; the nitridation in a N 2 ‐base atmosphere was followed after presintering with the total stepwise cycle of 1350°C × 20 h +1400°C × 20 h +1450°C × 2 h. The final phases obtained in the two different composites were Si 3 N 4 and MoSi 2 or WSi 2 ; no free elemental Si and Mo or W were detected by X‐ray diffraction.