Material to prevent low temperature degradation of zirconia

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

2007-11-20

2007-11-20

McNeil, Jennifer C. (Department: 1775)

Stock material or miscellaneous articles

Composite

Of inorganic material

C428S702000

Reexamination Certificate

active

10711154

ABSTRACT:
The invention is directed to a 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 polyorystalline 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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