Compositions: coating or plastic – Coating or plastic compositions – Metal-depositing composition or substrate-sensitizing...
Patent
1975-09-04
1977-07-12
Poer, J.
Compositions: coating or plastic
Coating or plastic compositions
Metal-depositing composition or substrate-sensitizing...
C04B 3548
Patent
active
040351912
ABSTRACT:
Mature zirconia ceramic compositions stabilized in the monoclinic and tetragonal structure with 0.1-5% ZnO and as little as 0.5% of a primary stabilizer selected from MgO, Y.sub.2 O.sub.3 or combinations thereof. Compacted ceramic compositions are fired and matured at temperatures below the volatilization point of ZnO and in the range of 2750.degree.-2950.degree. F.
Zirconia is conventionally batched with magnesia, yttria or mixtures thereof, with or without other known stabilizers including ceria and calcia, together with up to about 5% ZnO and then compacted and sintered at a temperature which retains at least 0.1% ZnO in the fired body. Conventional cooling is prescribed. Subsequent thermal cycling of the fired body between 400.degree. and 2500.degree. F. reveals a stable body with no degradation in strength. Magnesia stabilized compositions show no signs of early destabilization on thermal cycling and may even show increasing room temperature strength as cycling progresses.
REFERENCES:
patent: 2040215 (1936-05-01), Rava
patent: 2427034 (1947-09-01), Wainer
patent: 3410728 (1968-11-01), Fullman et al.
Corning Glass Works
Patty, Jr. Clarence R.
Poer J.
Wardell Richard N.
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