Alkaline Earth Metaborates as Property Enhancing Agents for Refractory Concrete.
Patent, Filed 11 Apr 86, patented 28 Apr 87,
DEPARTMENT OF THE NAVY WASHINGTON DC
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A significant increase in the structural strength of heated calcium aluminate refractory products, such as mortar and concrete, can be obtained by the addition of alkaline earth borates, barium metaborate in particular, and heating in the range of 500 to 1000 degrees F. to cure the refractory, with an optimum strength provided at approximately 750 degrees F. It is an object of this invention, therefore to lower the fusion point of alumina refractory concretes while increasing the strength thereof. It has been found that small amounts of some alkaline earth salts, certain alkaline earth borates in particular, can be used to lower the fusion point and increase the strength of high aluminate refractories. This invention due, to lowering of the fusion point in refractory concretes, provides substantial reductions in cost because high heat and large amounts of fuel are not required for heat curing. The improved refractory mortars provided, have significant increase in strength and can be cured at a range of 500 to 1000 degrees F.
- Ceramics, Refractories and Glass