Foam glass having a low coefficient of thermal expansion and related methods
US8936850B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 14, 2011 |
| Grant date | Jan 20, 2015 |
| Priority date | — |
| Expiry date | Jul 14, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/249969
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Foam glass may include natural glass, wherein the foam glass includes greater than 5% alumina by weight of the foam glass and has a coefficient of thermal expansion ranging between 4×10−6 ppm/° C. and 6×10−6 ppm/° C. A composition for making foam glass may include natural glass including at least 5% alumina by weight of the composition, soda ash including less than 10% by weight of the composition, and boric acid including at least 5% by weight of the composition. A method for making foam glass may include mixing natural glass with boron to form a mixture, milling the mixture, melting the mixture at a temperature of at least 900° C., and allowing the melted mixture to cool, such that the foam glass includes at least 5% alumina by weight of the foam glass and at least 5% boron oxide by weight of the foam glass.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.