The application of Ewende micro silica powder (silica fume) in refractories has the following advantages:
1.Improvement of fluidity and molding:
It can improve the fluidity of indeterminate refractory castables, reduce the water consumption and make them easier to be molded, so as to greatly improve the production efficiency.
2.Enhancement of densification and strength:
Due to the gap-filling effect of its ultra-microstructure, it can fill the pores in the refractory material, which significantly improves the densification and strength of the material.
3.Enhance high temperature performance:
With high activity, it is easier to generate mullite phase in the presence of alumina components, which significantly improves the high temperature strength and thermal shock of the refractory material, and enhances the stability and thermal shock resistance of the refractory material in high temperature environment.
4.Extend service life:
It helps to improve the comprehensive performance of refractory materials, and then extend the service life of refractory products.
5. Reduce cost:
To a certain extent, it can replace pure aluminum oxide mud as refractory materials, saving cost.
Micro silica powder is a kind of siliceous powder formed by the rapid oxidation and condensation of silicon dioxide and silicon gas produced during the smelting of ferrosilicon alloy and industrial silicon when it meets air. It is characterized by high amorphous silicon dioxide content, low impurity content, high chemical activity, fine particles and large specific surface area. At present, in addition to the general use of micro-silica powder in cast refractories, in the sintered refractories of electrofusion has also gained a large number of applications.
