초록 ▼

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 (

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 Al2O3) and high alumina cement (preferably 75% Al2O3) 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.

대표청구항 ▼

An hydraulic refractory cementitious formulation consisting essentially of: 70 to 86% of a magnesia component containing at least 94% MgO, 5 to 15% of an alumina component containing at least 98% Al2O3, 9 to 15% of an aluminous cement component containing at least 45% Al2O3, said formulation after w

An hydraulic refractory cementitious formulation consisting essentially of: 70 to 86% of a magnesia component containing at least 94% MgO, 5 to 15% of an alumina component containing at least 98% Al2O3, 9 to 15% of an aluminous cement component containing at least 45% Al2O3, said formulation after wetting being capable of hydraulically setting at room temperature.