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研究了一种化学气相沉积(CVD)制备超细铼粉的新方法,即以NH4ReO7为原料,通过将其分解为Re2O7后气相输运至还原区,经氢气还原生成超细铼粉。对不同还原温度下制备的超细铼粉样品,采用XRD、SEM、激光粒度分析进行表征,实验揭示了烧结作用对晶粒尺寸、形貌、表面状态及粒度等粉末性能的影响规律。结果表明,随还原温度升高,烧结作用增强,制备的超细铼粉晶粒尺寸增大,具有更好的球形度,表面趋于光洁,平均粒径增大。
A new method for the preparation of ultrafine rhenium powder by chemical vapor deposition (CVD) was studied. NH4ReO7 was used as a raw material, which was decomposed into Re2O7 and then transported to the reduction zone by gas phase. The ultrafine rhenium powder was reduced by hydrogen. The ultrafine rhenium powder samples prepared under different reduction temperatures were characterized by XRD, SEM and laser particle size analysis. The influence of sintering on the powder properties such as grain size, morphology, surface state and particle size was revealed. The results show that with the increase of the reduction temperature, the sintering effect is enhanced. The size of the prepared ultrafine rhenium powder is increased, the spherulites have better sphericity, the surface tends to be bright and clean, and the average particle size increases.