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均匀沉淀法制备AI/ZnS复合粒子 总被引:4,自引:0,他引:4
介绍了以硫代乙酰胺(TAA)和乙酸锌[Zn(Ac)2]为主要原料,在片状铝粉表面包覆一层ZnS,制备出包覆式复合粒子Al/ZnS,改变母粒子Al粉的加入量及反应温度,确定制备包覆完全致密复合粒子的最佳条件,通过SEM、XRD及粒度测试等分析方法对复合粒子进行表征。 相似文献
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Al/HTPB含能复合粒子的制备及表征 总被引:1,自引:0,他引:1
为保护铝粉在固体火箭推进剂中的活性,增加超细铝粉与固体推进剂其它组分的相容性,以端羟基聚丁二烯(HTPB)为包覆剂,异佛尔酮二异氰酸酯(IPDI)为固化剂,包覆了表面活化、粒径为2 μm左右的超细铝粉,制备了Al/HTPB含能复合粒子。研究了氨基硅烷偶联剂KH-550改性铝粉及包覆剂用量对包覆铝粉形貌和粒径的影响。用扫描电镜(SEM)、透射电镜(TEM)、X射线衍射仪(XRD)、红外光谱(FTIR)、激光粒度仪、热重-差热分析(TG-DTA) 表征了 Al/HTPB复合粒子。结果表明:超细铝粉经KH-550改性且包覆剂用量为1.5%时,Al/HTPB含能复合粒子的包覆膜更均匀,低于400 ℃时,HTPB包覆层能防止铝粉的氧化,在400~525 ℃范围内HTPB能迅速燃烧,迅速释放出包覆的活性铝。 相似文献
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Nano-MnFe2O4 particles were synthesized by co-precipitation phase inversion method and low-temperature combustion method respectively, using MnCl2, FeCl3, Mn(NO3)2, Fe(NO3)3, NaOH and C6H8O7. X-ray diffraction (XRD), transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FT-IR), thermogravim-etry-differential thermal analysis (TG-DTA) and differential scanning calorimetry (DSC) were used to characterize the structure, morphology, thermal stability of MnFe2O4 and its catalytic performance to ammonium perchlorate. Results showed that single-phased and uniform spinel MnFe2O4 was obtained. The average particle size was about 30 and 20 nm. The infrared absorption peaks appeared at about 420 and 574 cm-1, and the particles were stable below 524 ℃. Using the two prepared catalysts, the higher thermal decomposition temperature of ammonium perchlorate was decreased by 77.3 and 84.9 ℃ respectively, while the apparent decomposition heat was increased by 482.5 and 574.3 J?g?1. The catalytic mechanism could be explained by the favorable electron transfer space provided by outer d orbit of transition metal ions and the high specific surface absorption effect of MnFe2O4 particles. 相似文献
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