Low-Temperature Synthesis and Micro-Morphology Observation of Transparent MgAl2O4 Nano-Ceramics
Transparent MgAl2O4 nano-ceramics were prepared by ultrahigh-pressure-sintering method, using improved nano-sized powder synthesized by high-temperature calcination. The synthesis temperatures were exactly measured by nichrome-NiSi thermocouple passing through the samples. The micromorphology of the ceramics was observed by means of dynamic force microscopy (DFM), and the relation between transparency and micro-morphology was investigated. The results show that, the sintering temperatures, now calibrated, of transparent nano-ceramics are just 540~700°C, which are much lower than those of conventional nano-ceramics and transparent ceramics, and the uniformity of grain sizes and orderliness of the grain array are beneficial to the transparency and integrity of the ceramics.
Wei Pan and Jianghong Gong
X. H. Chang et al., "Low-Temperature Synthesis and Micro-Morphology Observation of Transparent MgAl2O4 Nano-Ceramics", Key Engineering Materials, Vols. 336-338, pp. 2308-2311, 2007