| http://www.w3.org/ns/prov#value | - When spray dried zirconias are employed, it is within the scope of this invention to incorporate minor amounts of a second refractory oxide as a binder to improve particle strength, e.g. silica, alumina, or mixtures thereof; albeit when silica is used its concentration should not exceed about 1.0 percent, and preferably should not exceed about 0.5 percent, based on the weight of the zirconia (dry
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