Spinel slurry and casting process

Patent metadata

Field	Value
Publication number	US-2016229701-A1
Application number	US-201615003061-A
Country	US
Kind code	A1
Filing date	Jan 21, 2016
Priority date	Jul 1, 2014
Publication date	Aug 11, 2016
Grant date	—

Abstract

A magnesium aluminate spinel nanopowder including:
a particle size of from 200 to 800 nm; a median particle size of from 200 to 400 nm; and a surface area by BET is from 2 to 10 m 2 /g.

Also disclosed is a method of making the nanopowder by co-precipitation and methods of use thereof, as defined herein.

First claim

What is claimed:

1 . A magnesium aluminate spinel nanopowder comprising:
a particle size of from 200 to 800 nm; a median particle size of from 200 to 400 nm; and a surface area by BET is from 2 to 10 m 2 /g.

2 . The nanopowder of claim 1 wherein:
the particle size is from 200 to 600 nm; and
the particle surface area is from 4 to 10 m 2 /g.

3 . The nanopowder of claim 1 wherein:
the particle size is from 200 to 400 nm;
the median particle size is from 250 to 350 nm; and
the particle surface area is from 6 to 8 m 2 /g.

4 . The nanopowder of claim 1 wherein the median particle size is 300 nm.

5 . A method of making the magnesium aluminate spinel nanopowder of claim 1 , comprising:
contacting an aqueous solution of (NH 4 ) 2 CO 3 and an aqueous solution of a mixture of (NH 4 )Al(SO 4 ) 2 and Mg(NO 3 ) 2 at about 45 to 55° C.; aging the reaction mixture at about 45 to 55° C. for 5 to 15 hrs while mixing to produce a solid; separating, washing, and drying, the resulting solid; and sintering the resulting solid at from 1300 to 1500° C. to form a spinel product.

6 . The method of claim 5 wherein the contacting comprising controlled addition the aqueous solution of a mixture of 0.5 mol % (NH 4 )Al(SO 4 ) 2 and 0.25 mol % Mg(NO 3 ) 2 to the aqueous solution of 1.5 mol % (NH 4 ) 2 CO 3 using a syringe pump.

Assignees

• Corning Inc

Inventors

• Heine Jennifer Anella
• Miao Weiguo
• Zink Nathan Michael

Classifications

• C01P2002/32

  spinel-type (AB2O4) · CPC title

• C01P2006/12

  Surface area · CPC title

• C01P2004/62

  Submicrometer sized, i.e. from 0.1-1 micrometer · CPC title

• C01F7/162 Primary

  Magnesium aluminates · CPC title