高温高压制备氧化锌透明多晶陶瓷

In this paper, ZnO powder owned high purity and the particle size in the 60-70nm was obtained by self-propagation high-temperature synthesis method. X-ray diffraction (XRD), transmission electron microscope (TEM) used to characterize the powder. Furthermore, the influence of different annealing temperature and annealing atmosphere on samples was investigated in detail. We found 800℃ and 6h was the best conditions that the impurities were removed while the grain sizes were still maintained in the nanometer size by further annealing. The ZnO polycrystalline transparent ceramic was successfully prepared for the first time by ultrahigh pressure sintering using the six-pressure-source machine. The result showed the ZnO transparent ceramic was only obtained at temperature (770℃-870℃) under high-pressure (4.6Gpa-5.4GPa). After polishing the transmittance of the samples were further improved. And the composition of transparent samples, transmittance and luminescence properties were characterize by XRD, UV-VIS-NIR spectrum analysis, and He-Cd325nm laser analysis. The transparence mechanism maybe interpreted by thermoplastic deformation.