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Nondestructive inspection of sinterability of ceramic tiles by terahertz spectroscopy

The sinterability of ceramic tiles was evaluated using terahertz (THz) time-domain spectroscopy. The transmittance, complex refractive index, and reflectance of the ceramic tiles fired at various temperatures were measured in frequency range of 0.3-1.2 THz. The relation between these THz properties and their sinterability were exam-ined. The firing-temperature dependences of the refractive index and reflectance at 0.5 THz showed a similar behavior as that shown by the bulk density. These results show that the THz spectroscopy can be applied to nondestructive inspection of the sinterability of ceramic tiles.