Stock material or miscellaneous articles – Composite – Of inorganic material
Reexamination Certificate
2006-05-02
2006-05-02
Lavilla, Michael E. (Department: 1775)
Stock material or miscellaneous articles
Composite
Of inorganic material
C428S472100, C428S632000, C428S633000, C428S702000
Reexamination Certificate
active
07037603
ABSTRACT:
The invention is directed to a material and a method of producing the material that is unaffected by the low-temperature degradation, humidity-enhanced phase transformation typical of yttria-stabilized zirconia in general, as well as of yttria-stabilized tetragonal zirconia polycrystalline ceramic (Y-TZP). Because of the high fracture toughness and high mechanical strength, this class of materials is widely used, including as implants, such as for the packaging material for small implantable neural-muscular sensors and stimulators. The destructive phase transformation is eliminated by converting the surface to stable cubic or T-prime zirconia by post-densification thermal treatment in a cation-rich milieu.
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Alfred E. Mann Foundation for Scientific Research
Lavilla Michael E.
Schnittgrund Gary D.
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