Method for sintering high density yttria-gadolinia ceramic scint

Details Method for sintering high density yttria-gadolinia ceramic scint Method for sintering high density yttria-gadolinia ceramic scint

1982-06-18

1984-09-25

Parrish, John

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Optical fiber, waveguide, or preform

2523014R, 264 56, 264 65, 264 66, C09K 110

Patent

active

044735138

ABSTRACT:
A method for preparing high density yttria-gadolinia ceramic scintillators includes cold-pressing a multicomponent powder to form powder compacts and then sintering the compacts to form transparent-to-translucent ceramic scintillator bodies. The powder compacts are formed by either die pressing or die pressing followed by isostatic pressing to further increase green density. The powder compacts are sintered in vacuum or a reducing atmosphere at a temperature of between 1800.degree. C. and 2100.degree. C. The preferred heating sequence includes a holding period at a temperature lower than the final sintering temperature. The finished scintillator includes Y.sub.2 O.sub.3, Gd.sub.2 O.sub.3, and one or more of Eu.sub.2 O.sub.3, Nd.sub.2 O.sub.3, Yb.sub.2 O.sub.3, Pr.sub.2 O.sub.3, Dy.sub.2 O.sub.3, and Tb.sub.2 O.sub.3 rare earth activator oxides. The finished scintillator may also include at least one of SrO and CaO as afterglow reducers.

REFERENCES:
patent: 3842012 (1974-10-01), Hoppenbrouvers
patent: 4040845 (1977-08-01), Richerson et al.
patent: 4147744 (1979-04-01), Rhodes
patent: 4224524 (1980-09-01), Suys et al.
patent: 4225653 (1980-09-01), Brixner
Carnall et al., "Transparent Gd.sub.2 O.sub.3 Ceramics and Phosphors", Materials Research Bulletin, vol. 7, pp. 647-653, Permagon Press (1972).
Lefever et al., "Transparent Yttrium Oxide Ceramics", 1967, pp. 865-869.
Buchanan et al., "Cathodoluminescent Properties of the Rare Earths in Yttrium Oxide", Journal of Applied Physics, vol. 39, No. 9, Aug. 1968, pp. 4342-4347.
Rhodes, "Controlled Transient Solid Second-Phase Sintering of Yttria", Journal of the American Ceramic Society, vol. 64, No. 1, Jan. 1981, pp. 13-19.
Greskovich et al., "Fabrication of Transparent ThO.sub.2 -Doped Y.sub.2 O.sub.3 ", American Ceramic Society Bulletin, vol. 52, No. 5, pp. 473-478 (1973).

Affiliated with

Also associated with

Rating

Method for sintering high density yttria-gadolinia ceramic scint does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for sintering high density yttria-gadolinia ceramic scint, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for sintering high density yttria-gadolinia ceramic scint will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1769168