Preparation of precursors for yttrium-containing advanced cerami

Details Preparation of precursors for yttrium-containing advanced cerami Preparation of precursors for yttrium-containing advanced cerami

1987-11-16

1990-02-20

Stoll, Robert L.

Compositions: ceramic

Ceramic compositions

Yttrium, lanthanide, actinide, or transactinide containing

423 211, 423263, 423593, 505 1, 252500, 252518, 252521, C01F 700

Patent

active

049026550

ABSTRACT:
This is a process for making precursors for tetragonally stabilized ceramic. It utilizes fluidized bed chlorination of a rare earth ore (e.g. xenotime or monazite) a separation of yttrium chloride by-product by differential condensation at 725-1200C and reaction of the yttrium-depleted blend of earth chlorides with an alkali metal alkoxide to produce a blend of rare earth alkoxides for mixing with alkoxide of zirconium and/or hafnium producing an alkoxide composite for polymerizing and processing into the ceramic.

REFERENCES:
patent: 3895097 (1975-07-01), Langenhoff
patent: 3941719 (1976-03-01), Yoldas
patent: 4208475 (1980-06-01), Paruso
patent: 4225635 (1980-09-01), Yoldas
patent: 4244935 (1981-01-01), Dell
patent: 4346131 (1982-08-01), Yoldas
patent: 4472510 (1984-09-01), January
patent: 4507254 (1985-03-01), Ozaki
patent: 4535026 (1985-08-01), Yoldas
patent: 4650652 (1987-03-01), Naitou
patent: 4670573 (1987-06-01), Greco
Tsukuma, "Mechanical Properties and Thermal Stability of CeO Containing Tetragonal Zirconia Polycrystals" American Ceramic Society Bulletin (vol. 65, No. 10, 1986, pp. 1386-1389).

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