Compositions: ceramic – Ceramic compositions – Refractory
Patent
1982-04-26
1983-08-23
Poer, James
Compositions: ceramic
Ceramic compositions
Refractory
501124, 106104, C04B 3504
Patent
active
044004745
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.
REFERENCES:
patent: 4244745 (1981-01-01), Havranek et al.
Copperthwaite Martin
Roberts Michael A.
Poer James
Riesmeyer, III William F.
USS Engineers & Consultants, Inc.
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