Chemistry of inorganic compounds – With additive – For stabilizing crystal size or shape
Patent
1985-03-27
1986-10-28
Carter, H. T.
Chemistry of inorganic compounds
With additive
For stabilizing crystal size or shape
423608, 501103, 501104, C01G 2502
Patent
active
046198172
ABSTRACT:
The invention is characterized by two main methods of producing stabilized or partially stabilized zirconia powders with controlled particle size by use of complexing agents and hydrothermal treatment. A further embodiment of the invention is characterized by a combination of the first two methods to produce powders containing more than one major particle size. The invention also allows use of low cost readily available starting material, controlled doping level and incorporation of dual constituents such as MgO, CaO; Y.sub.2 O.sub.3, MgO; or Y.sub.2 O.sub.3, CaO in the structure for production of stabilized zirconia. Triply stabilized zirconia containing Y.sub.2 O.sub.3, MgO and CaO may also be produced. A final embodiment of the invention allows the production of dually and triply stabilized zirconia by hydrothermal treatment without the use of complexing agents.
REFERENCES:
patent: 2467089 (1949-04-01), Marisic et al.
patent: 3334962 (1967-08-01), Clearfield
patent: 3514252 (1970-05-01), Levy et al.
patent: 4205051 (1980-05-01), Takahashi et al.
patent: 4501818 (1985-02-01), Rossi
Adair James H.
Sekercioglu Ibrahim
Stambaugh Edgel P.
Wills Roger R.
Battelle (Memorial Institute)
Carter H. T.
Wiesmann Klaus H.
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