Abstract
The present study aims to determine controlled crystallisation heat treatments and thermal stability for pure B phase glass-ceramic in the Y-Si-Al-O-N system. Experiments using differential thermal analysis and the ultrasonic techniques were performed on a YSiAlON glass to define the optimum nucleation temperature of B phase according to Marotta's method. Changes in elastic properties allowed to determine the optimum nucleation time and to follow the glass to glass-ceramic transformation on massive glass samples. Maximum bulk nucleation occurs after one hour in the range 960-970°C and the grain growth ends after 10 hours at the crystallisation temperature of 1050°C. XRD analyses confirm B phase as the unique crystalline phase thermally stable up to 1150°C and SEM observations show a very fine and homogeneous microstructure with a high crystal volume fraction. By determining optimum conditions for nucleation and crystal growth of B phase, good quality nitrogen glass-ceramics have been produced.
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