Silicon nitride structural ceramics with an elevated strength at 1300°C

Silicon nitride structural ceramics with an elevated strength at 1300°C

A high-temperature ceramics based on Si3N4 with an ultimate bending strength of 620 MPa at room temperature and 450 MPa at 1300°C has been developed using hot pressure casting and compression sintering. The ceramics is characterized by a high degree of crystallization of the intergrain phase and the...

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Veröffentlicht in:Refractories and industrial ceramics 1997, Vol.38 (6), p.231-234
Hauptverfasser: Paranosenkov, V P, Merkulova, A V, Shkarupa, I L, Chernyavskaya, L V, Sosulina, A P, Yudin, V M
Format: Artikel
Sprache:eng
Schlagworte:
Bend strength
Ceramics
Crystallization
High temperature
Inclusions
Phase composition
Pressure casting
Room temperature
Silicon nitride
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Zusammenfassung:A high-temperature ceramics based on Si3N4 with an ultimate bending strength of 620 MPa at room temperature and 450 MPa at 1300°C has been developed using hot pressure casting and compression sintering. The ceramics is characterized by a high degree of crystallization of the intergrain phase and the presence of high-temperature 3Y2O3·5Al2O3 garnet in the phase composition. The microstructure of the ceramics is represented mainly by irregular grains with a maximum size of 12 μm and inclusions of elongated hexagonal crystals of Si3N4.
ISSN:1083-4877
1573-9139
DOI:10.1007/BF02768257