Chemical composition for production of hollow spherical glass particles with high compressive strength

Patent metadata

Field	Value
Publication number	US-10414689-B2
Application number	US-201615345319-A
Country	US
Kind code	B2
Filing date	Nov 7, 2016
Priority date	Dec 21, 2015
Publication date	Sep 17, 2019
Grant date	Sep 17, 2019

Abstract

A hollow spherical glass particle, comprising aluminum oxide Al 2 O 3 , silicon dioxide SiO 2 and at least one metal oxide, wherein the metal oxide is selected from the group consisting of alkali metal oxides and alkaline earth metal oxides, wherein the ratio of aluminum atoms to alkali metal atoms is about 1:1 and the ratio of aluminum atoms to earth alkali atoms is about 2:1, with the proviso that the hollow spherical glass particle is free of boron.

First claim

What is claimed is:

1. A hollow spherical glass particle, comprising:
between about 32 wt. % and about 40 wt. % aluminum oxide Al 2 O 3 , between about 38 wt. % and about 46 wt. % silicon dioxide SiO 2 and at least one metal oxide, wherein the metal oxide comprises at least between about 18 wt. % and about 26 wt. % of at least one alkali metal oxide, and optionally alkaline earth metal oxides;
wherein the ratio of aluminum atoms to alkali metal atoms is about 1:1;
wherein where alkaline earth metal oxides are present the ratio of aluminum atoms to alkaline earth metal atoms is about 2:1;
wherein the hollow spherical glass particle has a particle diameter of between 100 and 400 microns; and
with the proviso that the hollow spherical glass particle is free of boron.

2. The hollow spherical glass particle of claim 1 , wherein the at least one alkali metal oxide comprises a mixture of K 2 O and Na 2 O.

3. The hollow spherical glass particle of claim 1 , wherein the hollow spherical glass particle has an 80% crush strength of at least 10000 psi.

4. The hollow spherical glass particle of claim 1 , wherein the hollow spherical glass particle has a melting temperature of at least 1200° C.

5. A plurality of hollow spherical glass particles of claim 1 .

6. The plurality of hollow spherical glass particles of claim 5 , wherein the hollow spherical glass particles have a true density of between about 0.4 g/cm 3 and 0.8 g/cm 3 .

7. A filler comprising the plurality of hollow spherical glass particles of claim 1 .

8. A method of using the filler of claim 7 in metal matrix syntactic foams.

9. A metal matrix syntactic foam comprising the filler of claim 7 and a metal and/or a metal alloy.

10. The metal matrix syntactic foam of claim 9 , wherein the metal is aluminum.

11. The metal matrix syntactic foam of claim 9 , wherein the metal alloy is an aluminum alloy.

Assignees

• Omya Int Ag

Inventors

• Isaev Alexander

Classifications

• C03C3/085

  containing an oxide of a divalent metal · CPC title

• C03C3/083

  containing aluminium oxide or an iron compound · CPC title

• B22D25/005

  Casting metal foams · CPC title

• C03C11/002 Primary

  Hollow glass particles · CPC title

• C03B19/108

  Forming porous, sintered or foamed beads (chemical aspects C03C11/00) · CPC title