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MgH2的制備及對(duì)高氯酸銨熱分解過程的影響
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國(guó)家自然科學(xué)基金委員會(huì)“青年基金”資助（50306008）


Synthesis of Magnesium Hydride and Its Effect on Thermal Decomposition of AP
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    摘要:

    采用直接氫化法制備氫化鎂（MgH2），運(yùn)用XRD、SEM、ICP等方法對(duì)其結(jié)構(gòu)進(jìn)行表征。用熱分析法（DSC）研究氫化鎂對(duì)高氯酸銨（AP）熱分解過程的影響。結(jié)果表明，5%MgH2可分別使AP的低溫和高溫放熱分解峰溫降低35.0和44.2 ℃，使AP的DSC表觀分解熱由0.44增加到1.20 kJ·g-1，表現(xiàn)出對(duì)AP熱分解過程具有顯著的增強(qiáng)促進(jìn)作用。隨著加入量增加，氫化鎂對(duì)AP熱分解的催化促進(jìn)作用逐漸增強(qiáng)，但當(dāng)氫化鎂含量達(dá)到30%時(shí)，催化促進(jìn)作用開始下降。氫化鎂對(duì)AP熱分解的催化促進(jìn)作用明顯強(qiáng)于純鎂粉。探討了氫化鎂增強(qiáng)促進(jìn)AP熱分解過程的作用機(jī)制。

    Abstract:

    Magnesium hydride (MgH2) was synthesized by a direct-hydriding method, and its structure was characterized by XRD, SEM and ICP. The thermal decomposition behavior of ammonium perchlorate (AP) in the presence of MgH2 was investigated by DSC. Results show that 5% MgH2 can decrease low-temperature and high-temperature thermal-decomposition peak-temperatures of AP by 35.0 oC and 44.2 oC respectively, and increase the DSC apparent heat release of AP from 0.44 kJ·g-1 to 1.20 kJ·g-1, which indicates that MgH2 has a remarkable catalytic effect on AP thermal decomposition. The catalytic effect of MgH2 was enhanced gradually with increasing of MgH2 content. However, the effect went down when the MgH2 content reached 30%. The catalytic effect of MgH2 on the thermal decomposition of AP was obviously better than that of pure magnesium powder. The mechanism of MgH2 for catalyzing the thermal decomposition of AP was also studied.

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劉磊力,李鳳生,支春雷,宋洪昌,楊 毅,張慶思. MgH2的制備及對(duì)高氯酸銨熱分解過程的影響[J].稀有金屬材料與工程,2010,39(7):1289~1292.[Liu Leili, Li Fengsheng, Zhi Chunlei, Song Hongchang, Yang Yi, Zhang Qingsi. Synthesis of Magnesium Hydride and Its Effect on Thermal Decomposition of AP[J]. Rare Metal Materials and Engineering,2010,39(7):1289~1292.]
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  • 收稿日期:2009-06-14
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