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Internal Mechanism Analysis of Modeling on Particles Size Distribution Characteristics of Impact Attrition Beryllium Powders
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Internal Mechanism Analysis of Modeling on Particles Size Distribution Characteristics of Impact Attrition Beryllium Powders
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National Natural Science Foundation of China (11062010); Ministry of Science and Technology Experts Service Enterprise Action Foundation of China (2009GJG30043); Ningxia Natural Science Foundation of China (NZ0946)

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    摘要:

    基于鈹（Be）沖擊制粉顆粒的形貌特征，建立了一個描述Be粉顆粒尺寸分布的物理模型，該模型僅含一個物理意義明確的參數(shù)。模型中考慮了2種重要的內(nèi)在影響機制：具有不同初始動能的顆粒在完成沖擊后的存在狀態(tài)應(yīng)該遵從Maxwell-Boltzmann分布，即大顆粒具有高的能量，狀態(tài)不穩(wěn)定，在沖擊過程中容易碎成小顆粒，這一影響可以用顆粒尺寸的負指數(shù)函數(shù)來描述；獲得低表面能的傾向又使得顆粒盡可能具有大的體積，這一影響可以用顆粒尺寸的立方函數(shù)來描述。實際的顆粒尺寸分布是這2種影響競爭的結(jié)果。計算結(jié)果與實驗數(shù)據(jù)符合得很好

    Abstract:

    Based on the particle morphology of beryllium (Be) powders produced by impact attrition, a physics model has been established for describing the particle size distribution, which has only one parameter with the definite physical meaning. Two important internal mechanisms are considered: firstly, the distribution of existing state of particles with different original kinetic energy should obey the Maxwell-Boltzmann distribution after impacting, which means that big particles are unstable for their being at higher energy level, therefore they are easy to be fractured into smaller pieces in impact attrition process, and this influencing factor can be described as the negative exponential function of particles size; secondly, the tendency to remain low surface energy requires that Be powders should keep big volume as much as possible, and this influencing factor is defined as the cube function of particles size. The actual size distribution of Be particles is resulted from the competition between these two factors. Calculating result from the model is in good agreement with data from measurement

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何力軍,許德美,胡 楠,李婷婷,鐘景明,羅 民. Internal Mechanism Analysis of Modeling on Particles Size Distribution Characteristics of Impact Attrition Beryllium Powders[J].稀有金屬材料與工程,2014,43(3):567~569.[He Lijun, Xu Demei, Hu Nan, Li Tingting, Zhong Jingming, Luo Min. Internal Mechanism Analysis of Modeling on Particles Size Distribution Characteristics of Impact Attrition Beryllium Powders[J]. Rare Metal Materials and Engineering,2014,43(3):567~569.]
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  • 收稿日期:2013-03-21
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  • 在線發(fā)布日期: 2014-06-27
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