Preparation of Layer Nano-Silicate / Alumina Castable Composites

The advantages of monolithic refractories are the main driving force for increasing researchers in this area which have shown great progress. From other hand the application of nano materials in refractories researchers have recently started which might end in unexpected results.After clay purification by mechanical methods and obtaining nano-silicate layers materials, the characterization were conducted by using XRD (X-ray Diffraction), SEM (Scanning Electron Microscope) and LPSA (Laser Particle Size Analyzer). Then, the produced nano-silicate particle was added to the ultra low cement Alumina castable containing microsilica and reactive Alumina. Mechanical and rheological properties of castable were studied before and after firing at 1500 ºC. The results showed that d-spacing between nano-silicate layers was about 1.2 nm. Flow ability of the castable showed an increase of 5%. Which meant that filler materials such as microsilica and reactive Alumina where decreased. Finally XRD results of fired samples indicated that existence of mulite as a desired phase in the system.

کلیدواژه ها:

Layer nano-silicate ، Alumina castable ، rheology ، mulite phase