Material to prevent low temperature degradation of zirconia
First Claim
1. A degradation resistant composition of matter for use in living tissue, comprising:
- an yttria-stabilized tetragonal zirconia polycrystal substrate;
a coating of alumina deposited on the substrate, said coating being deposited by ion beam assisted deposition in the presence of the substrate; and
whereinsaid coating has a total porosity of less than about 1.0 percent.
1 Assignment
0 Petitions
Accused Products
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.
-
Citations
7 Claims
-
1. A degradation resistant composition of matter for use in living tissue, comprising:
-
an yttria-stabilized tetragonal zirconia polycrystal substrate; a coating of alumina deposited on the substrate, said coating being deposited by ion beam assisted deposition in the presence of the substrate; and
whereinsaid coating has a total porosity of less than about 1.0 percent. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A degradation resistant composition of matter for use in living tissue, comprising:
-
an yttria-stabilized tetragonal zirconia polycrystal substrate; a moisture resistant coating of alumina deposited on the substrate;
whereinsaid coating has a total porosity of less than about 1.0 percent. - View Dependent Claims (7)
-
Specification