Method to prevent low temperature degradation of zirconia

Details Method to prevent low temperature degradation of zirconia Method to prevent low temperature degradation of zirconia

2005-12-08

2008-10-14

Padgett, Marianne L (Department: 1792)

Coating processes

Medical or dental purpose product; parts; subcombinations;...

C427S002240, C427S529000, C427S530000

Reexamination Certificate

active

07435443

ABSTRACT:
The invention is directed to a method of producing the material that is unaffected by the low-temperature degradation, humidity-enhanced phase transformation typical of yttria-stabilized zirconia, 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 rate is dramatically reduced by coating the surface of the Y-TZP component with dense alumina by a physical vapor deposition process, preferably ion beam assisted deposition.

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