High purity alumina is mainly used to manufacture rubies, sapphires, and yttrium aluminum garnets. It has a strong effect on improving the high-temperature strength of refractory materials and enhancing the corrosion resistance of materials.
Compared with traditional sintered fillers, high-purity alumina micro powder fused alumina fillers have high stability, are easy to obtain suitable particle size and dispersibility, and are more suitable for use as fillers. High temperature alumina micro powder filler for epoxy casting is the development direction. Electric fused alumina in the abrasive industry, due to its high Na2O content, is generally used in epoxy resins at less than 250 phr. This time, the method of introducing boric acid as an additive in the electric melting operation of industrial high-purity alumina raw materials was chosen. During exercise, boric acid reacts with Na2O to produce volatile compounds, greatly reducing the Na2O content in fused alumina. Industrialization has obtained high-purity and low-cost high-temperature alumina micro powder fillers for fused alumina.
The effect of boric acid content and method on Na2O reduction was studied using X-ray diffraction phase analysis and spectroscopic analysis. By adding boric acid to the aqueous solution and utilizing the adsorption properties of industrial high-purity alumina material nanoparticles to remove Na2O, the content of fused alumina filler exceeds 350 phr. Its epoxy castable has low initial viscosity, long duration, and stable performance.
High purity alumina is characterized by high activity and fine particle size. Suitable for molded products and unshaped refractory materials, such as refractory castables, plastic refractory materials, repair materials, spray repair materials, and coatings.
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