Basic refractory cementitious material and components thereof
US4400474A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 26, 1982 |
| Grant date | Aug 23, 1983 |
| Priority date | — |
| Expiry date | Apr 26, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2111/28
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A cementitious formulation which is self-setting when mixed with water, and which can be cast into monolithic refractory components capable of resisting molten metal and repeated thermal shocks, has three main components: high purity magnesia (at least 94% by weight being MgO); high purity alumina (at least 98% by weight Al.sub.2 O.sub.3) and high alumina cement (preferably 75% Al.sub.2 O.sub.3) by weight, or greater). The magnesia may be 60 to 95% by weight of the three components and the alumina amounts to at least 1% by weight of the three components. Castings produced from the formulation can survive repeated flame testing even after exposure to firing at elevated temperature: known, conventionally pressed and similarly fired magnesia refractories may not survive a single flame test.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.