کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1548793 | 1512945 | 2010 | 6 صفحه PDF | دانلود رایگان |
BeO nanoparticles were prepared by polyacrylamide gel route and the sintering properties of synthesized powder as a function of sintering temperature and time were investigated. Thermal behaviors of the polyacrylamide gel and beryllium salt were studied by thermogravimetry analysis (TGA). The calcination temperature (690°C) of the beryllium sulfate covered in polyacrylamide xerogel was almost 150 °C lower than that obtained by traditional methods. The nanocrystallites of the BeO particles were estimated by X-ray diffraction (XRD) according to Debye–Scherrer equation. Transmission electron microscopy (TEM) investigation revealed that the average particle size of the BeO nanoparticles prepared by calcining at 800 °C for 2 h, ranges from 15 nm to 25 nm. The sintering temperature was down to 1 600 °C, which was around 200 °C lower than conventional sintering temperature of the compact sample with common powders. The densification rate was fast at the first 3 h. The thermal conductivity of the sample sintered at 1 600 °C for 6 h was 186.6 W/(m·K).
Journal: Progress in Natural Science: Materials International - Volume 20, November 2010, Pages 81–86