Refractory sand composition
US5576255A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 13, 1995 |
| Grant date | Nov 19, 1996 |
| Priority date | — |
| Expiry date | Sep 13, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22D41/46
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Compositions for refractory materials and methods for providing the compositions are described. A synthetic forsterite-rich refractory sand composition includes a mixture. The mixture includes: a) a carbon bridging agent, the carbon bridging agent being present in the mixture in a proportion of from approximately 5 to approximately 15 percent by weight of the mixture; and b) a synthetic forsterite-rich sand, the synthetic forsterite-rich sand being free-flowing, having a MgO:SiO.sub.2 weight ratio of at least approximately 1.2, a specific gravity of approximately 3 g/cm.sup.3, a void volume of less than approximately 50 percent by volume of the synthetic forsterite-rich sand, and a fusion point of at least approximately 1610.degree. C., wherein i) at least approximately 50 percent by weight of the synthetic forsterite-rich sand is forsterite, and ii) from approximately 3 to approximately 27 percent by weight of the synthetic forsterite-rich sand is maghemite. The compositions and methods provide advantages in that the resulting refractory product have suitable characteristics with respect to size distribution, packing ability, thermal resistance and sintering properties for utiliza…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.