Ceramic composite material consisting of aluminium oxide and zirconium oxide as main constitutents

Patent metadata

Field	Value
Publication number	US-9795709-B2
Application number	US-201013515405-A
Country	US
Kind code	B2
Filing date	Dec 16, 2010
Priority date	Dec 16, 2009
Publication date	Oct 24, 2017
Grant date	Oct 24, 2017

Abstract

A composite material having a first phase includes an aluminum oxide proportion of at least 65% by volume and a second phase comprising a zirconium proportion of 10 to 35% by volume. The zirconium is present as zirconium oxide. The aluminum oxide is a ceramic matrix and the zirconium oxide is dispersed therein. From 90 to 99% of the zirconium oxide is present in the tetragonal phase. A chemical stabilizer for stabilizing the tetragonal phase of the zirconium oxide is also present. The total content of chemical stabilizer is <0.2 mol % relative to the zirconium oxide content.

First claim

It is claimed:

1. A composite material comprising:
a first phase, said first phase comprising at least 65% by volume aluminum oxide;
a second phase, said second phase comprising 10 to 35% by volume zirconium, wherein said zirconium is present as zirconium oxide, and wherein 90 to 99% of said zirconium oxide is present in a tetragonal phase; and
a chemical stabilizer for stabilizing said tetragonal phase of said zirconium oxide;
wherein said chemical stabilizer for stabilizing said tetragonal phase of said zirconium oxide is present in a total amount of <0.2 mol % relative to said zirconium oxide content;
wherein said aluminum oxide is present as a ceramic matrix; and
wherein said zirconium oxide is dispersed in said ceramic matrix.

2. The composite material according to claim 1 , wherein said zirconium oxide is present as particles having a grain size on average of 0.1 to 0.5 μm.

3. A sintered body comprising a sintered composite according to claim 1 .

4. A component comprising a sintered composite according to claim 1 , wherein said component absorbs energy under dynamic load.

5. The component of claim 4 , wherein said component is a medical component.

6. The component of claim 5 , wherein said component is a prosthetic.

7. The component of claim 6 , wherein said component is a hip joint implant or a knee joint implant.

8. The composite material according to claim 1 , wherein said zirconium oxide is present as particles having a grain size on average of 0.15 to 0.25 μm.

9. The composite material according to claim 1 , wherein said chemical stabilizer comprises at least one member selected from the group consisting of Y 2 O 3 , CeO 2 , CaO and MgO.

Assignees

• Kuntz Meinhard
• Kuntz Michael
• Gottwik Lukas
• Schilcher Kristina
• Morhardt Andreas
• Friederich Kilian
• Schneider Norbet
• Ceram Gmbh

Inventors

• Kuntz Meinhard
• Kuntz Michael
• Gottwik Lukas
• Schilcher Kristina
• Morhardt Andreas
• Friederich Kilian
• Schneider Norbet

Classifications

• C04B2235/3208

  Calcium oxide or oxide-forming salts thereof, e.g. lime · CPC title

• C04B35/6455

  Hot isostatic pressing · CPC title

• C04B2235/3206

  Magnesium oxides or oxide-forming salts thereof · CPC title

• C04B2235/3246

  Stabilised zirconias, e.g. YSZ or cerium stabilised zirconia · CPC title

• A61L31/026

  Ceramic or ceramic-like structures, e.g. glasses · CPC title