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Reaction-Bonding Preparation of Si3N4/MoSi2 and Si3N4/WSi2 Composites from Elemental Powders

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Abstract:

Si3N4/MoSi2 and Si3N4/WSi2 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 MoSi2 and WSi2; the nitridation in a N2-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 Si3N4 and MoSi2 or WSi2; no free elemental Si and Mo or W were detected by X-ray diffraction.

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/j.1151-2916.1997.tb02825.x

Affiliations: 1: Department of Inorganic Materials, Shandong Institute of Light Industry, 250100 Jinan, People's Republic of China 2: Dipartimento di Scienza dei Materialie Ingegneria Chimica. Politecnico di Torino. 10 1 29 Torino. Italy

Publication date: January 1, 1997

bsc/jace/1997/00000080/00000001/art00041
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