Silicon nitride based sintered material and method for producing

Details Silicon nitride based sintered material and method for producing Silicon nitride based sintered material and method for producing

1996-07-18

1999-06-01

Group, Karl

Compositions: ceramic

Ceramic compositions

Refractory

501 982, 264683, C04B 35584, C04B 35599

Patent

active

059087978

ABSTRACT:
To provide a silicon nitride based sintered material having high strength and high hardness and superior in reliability, silicon nitride sintered material has a composition mainly composed of silicon nitride or Si--Al--O--N, and further comprises 0.5 to 3 wt % of a Mg component, calculated as MgO, and 3 to 10 wt % of a Yb component, calculated as Yb.sub.2 O.sub.3. As a secondary crystal phase, the material contains one or more of Yb.sub.2 Si.sub.3 N.sub.4 O.sub.3, Yb.sub.2 Si.sub.3 N.sub.2 O.sub.5 and Yb.sub.4 Si.sub.2 N.sub.2 O.sub.7. Silicon nitride or Si--Al--O--N comprises 20-50 vol % of needle-like crystals of the entire material.

REFERENCES:
patent: 4795724 (1989-01-01), Soma et al.
patent: 4801565 (1989-01-01), Matsui
patent: 4806510 (1989-02-01), Kanai et al.
patent: 5200374 (1993-04-01), Yamada et al.
patent: 5369065 (1994-11-01), Yoshimura et al.

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