Si.sub.3 N.sub.4 Ceramic densified using Sc.sub.2 O.sub.3 and Si

Details Si.sub.3 N.sub.4 Ceramic densified using Sc.sub.2 O.sub.3 and Si Si.sub.3 N.sub.4 Ceramic densified using Sc.sub.2 O.sub.3 and Si

1982-03-15

1983-08-30

McCarthy, Helen M.

Compositions: ceramic

Ceramic compositions

Refractory

501152, C04B 3558

Patent

active

044017685

ABSTRACT:
At least 1 mole % SiO.sub.2 and 1/2 mole % Sc.sub.2 O.sub.3 are used as a densification aid to provide a polyphase silicon nitride ceramic having high creep strength. The composition is within the Si.sub.3 N.sub.4 - Si.sub.2 N.sub.2 O tie line, the Si.sub.3 N.sub.4 - Sc.sub.2 Si.sub.2 O.sub.7 tie line, and the Sc.sub.2 Si.sub.2 O.sub.7 - Si.sub.2 N.sub.2 O tie line in the ternary phase diagram for the Si.sub.3 N.sub.4, SiO.sub.2, Sc.sub.2 O.sub.3 system. The phases in the sintered ceramic are Sc.sub.2 Si.sub.2 O.sub.7, and Si.sub.3 N.sub.2 O, and at least 50 mole % Si.sub.3 N.sub.4.

REFERENCES:
patent: 3833389 (1974-09-01), Komeya et al.
patent: 4046580 (1977-09-01), Ishii et al.
patent: 4234343 (1980-11-01), Andersson
F. F. Lange, B. I. Davis, D. R. Clarke, "Compressive Creep of Si.sub.3 N.sub.4 /MgO Alloys", Journal of Materials Science 15 (1980), pp. 601-610.
F. F. Lange, "Silicon Nitride Polyphase Systems: Fabrication, Microstructure, and Properties", International Metals Reviews, 1980, No. 1, pp. 1-20.

Affiliated with

Also associated with

Rating

Si.sub.3 N.sub.4 Ceramic densified using Sc.sub.2 O.sub.3 and Si does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Si.sub.3 N.sub.4 Ceramic densified using Sc.sub.2 O.sub.3 and Si, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Si.sub.3 N.sub.4 Ceramic densified using Sc.sub.2 O.sub.3 and Si will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-906491