Research on the application of nanotechnology in low-thermal-conductivity refractory castables continues to advance.
Release time:
2025-12-23
【Summary】 Research on the application of nanotechnology in low-thermal-conductivity refractory castables is continuously deepening. Due to their size-effect and surface-interface effects, nanoparticles demonstrate unique advantages in optimizing the microstructure of castables and reducing thermal conductivity.
Research on the application of nanotechnology in low-thermal-conductivity refractory castables is continuously deepening. Due to their size-effect and surface-interface effects, nanoparticles demonstrate unique advantages in optimizing the microstructure of castables and reducing thermal conductivity. For instance, introducing a nano-ZrO₂ dispersion into corundum-spinel castables can replace conventional Cr₂O₃ fine powder. This not only avoids the hazards associated with heavy metals but also significantly enhances the material’s density and thermal-shock resistance by filling pores and refining grain size through the use of nanoparticles. Experimental data show that after high-temperature sintering at 1550℃, the strength of the castable increases by 1.5 to 2 times upon addition of nano-ZrO₂, while the porosity is reduced to 11%, and thermal conductivity is effectively controlled.
Moreover, nano-sol and gel technologies have opened up new avenues for the development of low-thermal-conductivity castables. Nano-magnesio-aluminate spinel powder prepared via the sol-gel method can be uniformly coated onto the surface of alumina aggregates, forming a nano-sized gel layer that promotes high-temperature sintering and lowers the sintering temperature. This nano-modification technique enables castables to maintain high strength while significantly reducing their thermal conductivity, making them well-suited for high-temperature industrial applications such as lime rotary kilns. Currently, related research is focusing on optimizing the dispersion stability of nanomaterials, achieving a balance between cost-effectiveness and performance, and developing scalable production processes, all aimed at further advancing the application of nanotechnology in the field of low-thermal-conductivity refractory materials.
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