Quality Assurance Of Sintered Refractories Through Nondestructive Testing With Microwaves

For quality assurance of refractories for the glass industry an early nondestructive test is required. A possibility for nondestructive testing, especially in green products, is given by the transition of microwaves, as this requires no coupling medium like water. In this work, some basic physical characteristics were measured which determine microwave absorption through refractories and flaw detection. For different refractories the dielectric constant, specific attenuation coefficient as well as dependence of the attenuation on the frequency were determined. It is shown that a high dielectric constant improves the deteciton of flaws.