| 氮化铝陶瓷低温热导率的实验研究 |
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| 引用本文： | 饶荣水,庄汉锐,蔡咏虹,王惠龄.氮化铝陶瓷低温热导率的实验研究[J].低温与超导,2003,31(3):41-45. |
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| 作者姓名： | 饶荣水 庄汉锐 蔡咏虹 王惠龄 |
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| 作者单位： | 1. 华中科技大学制冷与低温工程教研室,武汉,430074
2. 中科院上海硅酸盐研究所,200050 |
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| 摘 要： | 根据轴向稳态热流法原理 ,实验研究了 Al N陶瓷的低温热导率 ,为高温超导制冷机直接冷却提供了必要的实验数据。 Al N的热导率在 30～ 170 K之间 ,随温度的升高而增大 ,在 10 0 K时达到 5 8.36 W/ (m· K)。根据平均自由程理论 ,对影响氮化铝陶瓷热导率的微观因素进行了分析 ,影响本次测试氮化铝样品低温热导率的主要因素为声子与缺陷之间的散射。
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| 关 键 词： | 氮化铝陶瓷 低温热导率 实验研究 自由程 |
| 修稿时间： | 2002年11月4日 |
Experimental Investigation on the Low Temperature Thermal Conductivity of Aluminum Nitride Ceramic |
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| Rao Rongshui.Experimental Investigation on the Low Temperature Thermal Conductivity of Aluminum Nitride Ceramic[J].Cryogenics and Superconductivity,2003,31(3):41-45. |
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| Authors: | Rao Rongshui |
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| Abstract: | The low temperature thermal conductivity of Aluminum nitride ceramic(A1N) was measured using axis steady heat flow method. It is found that the low temperature thermal conductivity of A1N increases with the increasing temperature and reaches 58.36 W/(m·K) at 100K. Based on the concept of phonon mean free path, the factors that affect the thermal conductivity of this A1N specimen were studied. It is pointed out that the phonon-defect scattering process determines the thermal conductivity of the A1N specimen in this study. |
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| Keywords: | Aluminum nitride ceramic Low temperature thermal conductivity Experimental investigation Mean free path |
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