Silicon nitride powder, silicon nitride sintered body,...

Details Silicon nitride powder, silicon nitride sintered body,... Silicon nitride powder, silicon nitride sintered body,...

2005-01-25

2005-01-25

Group, Karl (Department: 1755)

Compositions: ceramic

Ceramic compositions

Refractory

C507S090000

Reexamination Certificate

active

06846765

ABSTRACT:
A silicon nitride sintered body comprising Mg and at least one rare earth element selected from the group consisting of La, Y, Gd and Yb, the total oxide-converted content of the above elements being 0.6-7 weight %, with Mg converted to MgO and rare earth elements converted to rare earth oxides RExOy. The silicon nitride sintered body is produced by mixing 1-50 parts by weight of a first silicon nitride powder having a particle ratio of 30-100%, an oxygen content of 0.5 weight % or less, an average particle size of 0.2-10 μm, and an aspect ratio of 10 or less, with 99−50 parts by weight of α-silicon nitride powder having an average particle size of 0.2-4 μm; and sintering the resultant mixture at a temperature of 1,800° C. or higher and pressure of 5 atm or more in a nitrogen atmosphere.

REFERENCES:
patent: 4608354 (1986-08-01), Avella et al.
patent: 5098872 (1992-03-01), Suyama et al.
patent: 5672553 (1997-09-01), Mitomo et al.
patent: 5908797 (1999-06-01), Urashima et al.
patent: 6242374 (2001-06-01), Komatsu
patent: 6294244 (2001-09-01), Iwaida et al.
patent: 6313054 (2001-11-01), Matsubara
patent: 6391812 (2002-05-01), Araki et al.
patent: 1-160870 (1989-06-01), None
patent: 04-175268 (1992-06-01), None
patent: 06-216481 (1994-08-01), None
patent: 06-263410 (1994-09-01), None
patent: 08-319187 (1996-12-01), None
patent: 09-030866 (1997-02-01), None
patent: 10-065296 (1998-03-01), None
patent: 10-194842 (1998-07-01), None
patent: 11-349381 (1999-12-01), None
patent: 2000-344577 (2000-12-01), None
Naoto Hirosaki, et al.; Precipitation of Second Phase in Si3N4of Self-reinforced Silicon Nitride; The abstract papers presented at the Annual Meeting of The Ceramic Society of Japan, 1998, held on Mar. 29-31, 1998; at Tsudanuma Campus (Narashino City), Chiba Institute of Technology; published by the Ceramic Society of Japan; pp. 196-197.
Kiyoshi Hirao, et al; Preparation of Rod-like β-Si3N4Single Crystal Partcles; Journal of the Ceramic Society of Japan 101[9] 11078-1080 (1993).

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