| Abstract Scope |
Self-Bonded Refractory, Patent #15/795,5573, utilizes a colloidal alumina binder between 72 and 96 % Al2O3. X-ray Diffraction Analysis confirms the binder phase in Self-Bonded Refractory consists of crystalline aluminum oxide, alpha, theta, and kappa phases with minimal amorphous phase, and with not more than 1.2% crystalline silica. Self-Bonded Refractory binder is 25% the volume and 20% of colloidal silica sol and is a fully powder-based refractory system, just add water. Self-Bonded Refractory has a firing range between 1,100 and 1,200 deg. C and Cold Fired MOR of 368 psi, sufficient and suitable for precision metal casting. The green elastic modulus of Self-Bonded Refractory, measured by Dynamic Modulus Analysis (DMA), is 10 times lower compared to colloidal silica-bonded systems. High temperature Creep resistance is 10 times greater with Self-Bonded Refractory, and in contact with Titanium 6Al 4V Self-Bonded Refractory did not show the reaction typical of a colloidal silica-bonded mold. |