Graphite Rupture
2009
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Graphite Rupture
Refractory alumina ball
An alumina ball refractory material and its method of preparation are disclosed. The material includes a volatilized silica binder wherein the volatilized silica binder is added to the batch as a thoroughly dispersed, acidified, aqueous slurry. Graphite and silicon carbide may also be included to control erosion by molten metal. Green strength binders are also usually included.
This invention relates to alumina ball containing refractories having a volatilized silica binder. It has been known that a volatilized silica binder produces superior characteristics when used in alumina refractory mixtures. The properties which may be improved by the inclusion of the proper proportions of volatilized silica include modulus of rupture, apparent porosity, linear change, volume change and spalling.
The present invention relates to alumina refractories and more particularly to those alumina refractories which are classified as having a high alumina ball content. This is generally considered to include refractories containing from about 50 to 99 percent Al 2 O 3 . Although the invention will be described with reference to such high alumina refractories, it is to be understood that the invention is not so limited and it includes all refractories which can employ volatilized silica as a binder.
The present invention involves an alumina ball actory material with a volatilized silica binder and its method of preparation and has the objective of improving the properties by forming a dispersed, acidified, aqueous slurry of the volatilized silica which is then mixed with the refractory batch. The batch may also include graphite, silicon carbide and green strength binders.
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An alumina ball refractory material and its method of preparation are disclosed. The material includes a volatilized silica binder wherein the volatilized silica binder is added to the batch as a thoroughly dispersed, acidified, aqueous slurry. Graphite and silicon carbide may also be included to control erosion by molten metal. Green strength binders are also usually included.
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