Reaction-bonding preparation of Si{sub 3}N{sub 4}/MoSi{sub 2} and Si{sub 3}N{sub 4}/WSi{sub 2} composites from elemental powders

Journal Article · Wed Jan 01 04:00:00 EST 1997 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1997.tb02825.x· OSTI ID:455183

Zhang, B R ^[1]; Marino, F ^[2]

---

1. Shandong Inst. of Light Industry, Jinan (China). Dept. of Inorganic Materials
2. Politecnico di Torino (Italy). Dipt. di Scienza dei Materiali e Ingegneria Chimica

Si{sub 3}N{sub 4}/MoSi{sub 2} and Si{sub 3}N{sub 4}/WSi{sub 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 Ar-base atmosphere was used before nitriding for the formation of MoSi{sub 2} and WSi{sub 2}; the nitridation in a N{sub 2}-base atmosphere was followed after presintering with the total stepwise cycle of 1,350 C {times} 20 h + 1,400 C {times} 20 h + 1,450 C {times} 2 h. The final phases obtained in the two different composites were Si{sub 3}N{sub 4} and MoSi{sub 2} or WSi{sub 2}; no free elemental Si and Mo or W were detected by X-ray diffraction.

• Sponsoring Organization: USDOE
• OSTI ID: 455183
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 1 Vol. 80; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BULK DENSITY
COMPOSITE MATERIALS
EXPERIMENTAL DATA
FABRICATION
MICROSTRUCTURE
MOLYBDENUM
MOLYBDENUM SILICIDES
NITRIDATION
POROSITY
POWDERS
SILICON
SILICON NITRIDES
SINTERING
TUNGSTEN
TUNGSTEN SILICIDES