Ceramic composite material consisting of aluminium oxide and zirconium oxide as the main constituents, and a dispersoid phase

Patent metadata

Field	Value
Publication number	US-9630883-B2
Application number	US-201013515413-A
Country	US
Kind code	B2
Filing date	Dec 16, 2010
Priority date	Dec 16, 2009
Publication date	Apr 25, 2017
Grant date	Apr 25, 2017

Abstract

A composite material consisting of aluminium oxide as a ceramic matrix and zirconium oxide dispersed therein. A method for the production thereof, components containing the composite and methods of using the same are also provided.

First claim

The invention claimed is:

1. A composite material comprising
at least 65% by volume aluminum oxide as a ceramic matrix;
from 10 to 35% by volume zirconium oxide particles dispersed in said ceramic matrix; a dispersoid phase in the form of platelets, and
<0.2 mol % of a chemical stabilizer relative to the zirconium oxide content;
wherein, based on the total zirconium oxide content, 80 to 99% of said zirconium oxide is present in the tetragonal phase;
wherein the zirconium oxide particles have an average grain size of from 0.1 to 0.5 μm;
wherein the chemical stabilizer is selected from the group consisting of Y 2 O 3 , CeO 2 , CaO and MgO; and
wherein the platelets of the dispersoid phase enable inelastic micro deformation.

2. The composite material according to claim 1 , wherein the zirconium oxide particles have an average grain size of from 0.15 to 0.25 μm.

3. The composite material according to claim 1 , further comprising a soluble constituent selected from the group consisting of Cr, Fe, Ti, a lanthanide and V.

4. The composite material according to claim 3 , wherein the soluble constituent is an element selected from the group consisting of Cr, Fe and Ti.

5. The composite material according to claim 1 , wherein the particle sizes of the dispersoids are 1 to 5 μm.

6. The composite material according to claim 1 , wherein the dispersoids comprise a substance which does not dissolve in aluminum oxide or in zirconium oxide when the composite material is sintered.

7. The composite material according to claim 1 , wherein the dispersoids are selected from the group consisting of strontium aluminate and lanthanum aluminate.

8. The composite material according to claim 1 , wherein the fracture strength is>1300 MPa.

9. A sintered body comprising the composite material according to claim 1 .

10. A component comprising the composite material according to claim 1 , wherein the composite absorbs energy under dynamic load.

11. The component of claim 10 which is a medical device.

12. An artificial prosthesis comprising the composite material of claim 1 .

13. The artificial prosthesis of claim 12 , which is a hip joint implant or a knee joint implant.

Assignees

• Kuntz Meinhard
• Kuntz Michael
• Gottwik Lukas
• Schlicher Kristina
• Morhardt Andreas
• Friederich Kilian
• Schneider Norbert
• Ceram Gmbh

Inventors

• Kuntz Meinhard
• Kuntz Michael
• Gottwik Lukas
• Schlicher Kristina
• Morhardt Andreas
• Friederich Kilian
• Schneider Norbert

Classifications

• C04B2235/3206

  Magnesium oxides or oxide-forming salts thereof · CPC title

• C04B2235/3225

  Yttrium oxide or oxide-forming salts thereof · CPC title

• C04B2235/3246

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

• C04B2235/662

  Annealing after sintering · CPC title

• C04B2235/3229

  Cerium oxides or oxide-forming salts thereof · CPC title