| 基于Rietveld无标样定量研究HMX的等温相变动力学 |
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| 引用本文： | 薛超,孙杰,宋功保,康彬,夏云霞.基于Rietveld无标样定量研究HMX的等温相变动力学[J].爆炸与冲击,2010,30(2):113-118. |
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| 作者姓名： | 薛超 孙杰 宋功保 康彬 夏云霞 |
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| 作者单位： | 1.西南科技大学材料科学与工程学院;中国工程物理研究院化工材料研究所 |
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| 基金项目： | 国家自然科学基金项目，国家重点基础研究发展计划(973计划)项目 |
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| 摘 要： | 以Rietveld无标样定量方法为基础,利用原位X射线粉末衍射技术(XRD)研究了奥克托今(HMX)的等温相变动力学。描述了不同温度下HMX的转变进度-时间曲线,求得Avrami指数n约为0.6,建立了相关的等温相变动力学方程。采用Arrhenius方程定量表示了速率常数k与温度T的关系,计算的活化能Ea约为151kJ/mol,指前因子lnA为36.2。结果表明:实验温度是影响相变的主导因素,HMX发生相变时,相近似于1维随机成核长大。 更多还原
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| 关 键 词： | 爆炸力学 等温相变 无标样定量分析 HMX 原位XRD 动力学 |
Kinetics of β→δ isothermal phase transition of HMX based on quantitative phase analysis using the Rietveld method |
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| XUE Chao,SUN Jie,SONG Gong-Bao,KANG Bin,XIA Yun-Xia.Kinetics of β→δ isothermal phase transition of HMX based on quantitative phase analysis using the Rietveld method[J].Explosion and Shock Waves,2010,30(2):113-118. |
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| Authors: | XUE Chao SUN Jie SONG Gong-Bao KANG Bin XIA Yun-Xia |
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| Abstract: | Based on the quantitative phase analysis using the Rietveld method, in-situ X-ray diffraction (XRD) experiments were conducted to explore β→δ isothermal phase transition kinetics of HMX. Transition extent-time curves of HMX were described at different isothermal temperatures, the Avrami exponent n was obtained close to 0.6, and the related isothermal phase transition kinetics equation was developed. The Arrhenius equation was used to quantify the relationship between the rate constant k and the temperature T, the calculated activation energy Ea was about 151 kJ/mol, and the calculated pre-exponential lnA was 36.2. The results show that the experimental temperature is the dominant factor controlling the β→δ phase transition of HMX, and δ phase experiences a similarly one-dimensional nucleation-and-growth mechanism randomly during the β→δ phase transition of HMX. |
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| Keywords: | HMX |
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