Highly transparent AlON fabricated via SPS synthesized by Al2O3/C core-shell starting powder and CRN method

摘要

Two types of starting powders were used to synthesis AlON powder via the carbothermal reduction and nitridation (CRN) route, the Al2O3 and C mixture, and the Al2O3/C core-shell. Al2O3/C core-shell resulted in lower carbon content and lower synthesis temperature for CRN method. AlON powder was synthesized using Al2O3 and C then was sintered via SPS at 1500, 1600, and 1700 degrees C for 10-30 min in a vacuum atmosphere. A sample with the highest transmittance was annealed at 1250 degrees C for 2, 4, and 8 h in air. The characteristics of AlON powder and bulk samples were investigated by XRD, DLS, FT-IR, elemental analysis of carbon and sulfur, SEM, EDS, and UV-Vis spectroscopy analyses. The annealing process for 2 h improved the transmittance from 31% to 58% at the wavelength of 600 nm. AlON powder synthesized using Al2O3/C core-shell, was SPSed at 1700 degrees C for 15 min and annealed at 1250 degrees C for 2 h was used to make a sample of 1.7 mm thickness whose transmittance was found to be 81%.