# US 10,865,119 B2 · Preparation of a metastable tetragonal zirconia aerogel

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- Number: US 10,865,119 B2
- Document ID: US10865119B2
- Status: Granted
- Kind: B2
- Application number: 15/518,599
- Filed: 2015-10-13
- Published: 2019-01-24
- Granted: 2020-12-15
- Earliest claimed: 2014-10-13
- Assignees: Aproxi Aps
- Applicants: Aproxi APS
- Inventors: Kjeld Schaumburg; Henrik Tofte Jespersen; Per Bækgaard
- Web page: https://patentgrep.com/patent/US10865119B2

## CPC

- C01G 25/02: Oxides
- B01J 13/0091: {Preparation of aerogels, e.g. xerogels}
- C04B 35/486: Fine ceramics
- C04B 35/488: Composites
- C04B 35/624: Sol-gel processing
- C01P 2002/50: Solid solutions
- C01P 2004/51: Particles with a specific particle size distribution
- C01P 2004/61: Micrometer sized, i.e. from 1-100 micrometer
- C01P 2006/10: Solid density
- C04B 2235/765: Tetragonal symmetry
- C01G: COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts or peroxyacids C01B15/00; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium, or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds containing nitrogen, other non-metals and metal C01B21/082}; metal amides C01B21/092; nitrites C01B21/50; {compounds of noble gases C01B23/0005}; phosphides C01B25/08; salts of oxyacids of phosphorus C01B25/16; carbides C01B32/90; compounds containing silicon C01B33/00; compounds containing boron C01B35/00; compounds having molecular sieve properties but not having base-exchange properties C01B37/00; compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites, C01B39/00; cyanides C01C3/08; salts of cyanamide C01C3/16; thiocyanates C01C3/20)
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

## Abstract

The present application discloses a process for the preparation of metastable tetragonal zirconia in the form of an aerogel material, said material being capable of undergoing martensitic phase transformation to monoclinic zirconia. The application also discloses composite materials, such as dental filling materials, having included therein an aerogel material.

## Claims

### Claim 1

A metastable tetragonal zirconia aerogel material having a density of 1.0-4.5 g/cm3 and in particulate form having a particle size distribution wherein D10 value is from 30 μm to 100 μm.

### Claim 2 (depends on 1)

The metastable tetragonal zirconia aerogel material according to claim 1 which has a proportion of tetragonal zirconia of at least 80% based on the total amount of zirconia in the aerogel material.

### Claim 3 (depends on 1)

The metastable tetragonal zirconia aerogel material according to claim 1 which has a phase transformation capability of at least 60%.

### Claim 4 (depends on 1)

The metastable tetragonal zirconia aerogel material according to claim 1 in particulate form having a particle size of less than 100 μm.