| Kinetic characteristics of liquid phase sintering of mechanically activated W-15wt% Cu powder |
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| 作者姓名： | Zhigang Li Chengchang Jia Yuntao He Liliang Chen |
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| 作者单位： | Materials Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China |
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| 摘 要： | The kinetic characteristics of W grain growth operated by diffusion controlled Oswald ripening （DOR） during liquid phase sintering were studied. A liquid phase sintering of W-15wt%Cu was carried out by pushing compacts into a furnace at the moment when the temperature increased to 1340℃ for different sintering times. The results show that liquid phase sintering produces the compacts with considerably low relative density and inversely, rather high homogeneity. On the basis of the data extracted from the SEM images, the kinetic equation of W grain growth, G^n = G0^n ＋ kt, is determined in which the grain growth exponent n is 3 and the grain growth rate constant k is 0.15 μm^3/s. The cumulative normalized grain size distributions produced by different sintering times show self-similar. The cumulative distribution function is extracted from the curves by non-linear fitting. In addition, the sintering kinetic characteristics of W-15wt%Cu compacts were also investigated.
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| 关 键 词： | 液相烧结 机械合金化 晶粒长大 粉末冶金 动力学 W-Cu粉末 |
| 收稿时间： | 2005-07-27 |
Kinetic characteristics of liquid phase sintering of mechanically activated W-15wt%Cu powder |
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| Zhigang Li Chengchang Jia Yuntao He Liliang Chen.Kinetic characteristics of liquid phase sintering of mechanically activated W-15wt% Cu powder[J].Journal of University of Science and Technology Beijing,2006,13(4):338-345. |
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| Authors: | Zhigang Li Chengchang Jia Yuntao He Liliang Chen |
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| Affiliation: | Materials Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China |
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| Abstract: | The kinetic characteristics of W grain growth operated by diffusion controlled Oswald ripening (DOR) during liquid phase sintering were studied. A liquid phase sintering of W-15wt%Cu was carried out by pushing compacts into a furnace at the moment when the temperature increased to 1340℃ for different sintering times. The results show that liquid phase sintering produces the compacts with considerably low relative density and inversely, rather high homogeneity. On the basis of the data extracted from the SEM images, the kinetic equation of W grain growth, G n Cn= Gn0 kt, is determined in which the grain growth exponent n is 3 and the grain growth rate constant k is 0.15 μm3/s. The cumulative normalized grain size distributions produced by different sintering times show self-similar. The cumulative distribution function is extracted from the curves by non-linear fitting. In addition, the sintering kinetic characteristics of W-15wt%Cu compacts were also investigated. |
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| Keywords: | liquid phase sintering mechanical alloying grain growth kinetics W-Cu alloy |
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