1. What is silica fume?
Silica fume, also known as microsilica, is a byproduct of producing silicon metal or ferrosilicon alloys. It is a highly reactive pozzolan with a particle size less than 1 micron. .
2. What are the benefits of using silica fume in refractory castables?
Silica fume can greatly enhance the properties of refractory castables, such as increasing refractoriness, improving mechanical strength, reducing porosity, and enhancing resistance to corrosion and erosion. .
3. How does silica fume work in refractory castables?
Silica fume works by filling the gaps between particles, increasing the density of the castable and reducing porosity. Its high surface area also promotes the formation of mullite and other high-temperature phases during firing, which further improves high-temperature performance. .
4. How much silica fume should be added to a refractory castable?
The amount of silica fume added varies depending on the specific application and formulation of the castable. Typically, 5-15% by weight of the castable is added as silica fume. .
5. What are the precautions in handling silica fume?
Silica fume is a fine particulate material that can pose a health hazard if inhaled. Workers should wear appropriate protective equipment such as dust masks and gloves when handling silica fume. .
6. How should silica fume be stored?
Silica fume should be stored in a dry, cool place in its original packaging or airtight containers. It should be kept away from moisture and other materials that could contaminate it. .
7. How is silica fume added to refractory castables?
Silica fume is typically added during the mixing stage of refractory castables. It can be added dry or as a slurry mixed with water or other binders. .
8. What are the limitations of using silica fume in refractory castables?
Silica fume can be costly and may not be suitable for all applications. Its high reactivity can also lead to issues such as excessive setting times or cracking if not properly controlled. .
9. Can silica fume be used in other applications besides refractory castables?
Yes, silica fume can also be used in concrete, shotcrete, and other cement-based materials to improve their properties. .
10. What is the future outlook for silica fume in refractory castables?
Due to its ability to improve high-temperature performance and reduce porosity, silica fume will likely continue to be an important ingredient in the development of advanced refractory castables for various industries such as steel, aluminum, and petrochemical.
For more Silica Fume in Refractory Castables, 95% Densified Silica Fume, Microsilica Fumeinformation, please contact us. We will provide professional answers.