Prestress in alumina-strengthened porcelain as estimated with Raman scattering spectroscopy

Abstract

Prestress in alumina-strengthened porcelain, caused by the mismatch in thermal shrinkage between the porcelain matrix and alumina particles during porcelain cooling, is estimated using Raman spectroscopy by monitoring the frequency shift of Raman band at 417 cm⁻¹, which is assigned to the A_1g vibrational mode of α-alumina. This spectroscopic estimation supports the validity of prestress which is expected to accumulate during porcelain cooling beginning at ∼850 °C.