查詢結果分析
來源資料
頁籤選單縮合
| 題 名 | 矽含量對鋁矽合金熱傳導性質之影響=Effect of Silicon on Thermal Conductivity of Al-Si Alloys |
|---|---|
| 作 者 | 洪緗媛; 陳貞光; 唐乃光; | 書刊名 | 鑄造工程學刊 |
| 卷 期 | 40:3=162 2014.09[民103.09] |
| 頁 次 | 頁1-8 |
| 分類號 | 440.39 |
| 關鍵詞 | 鋁矽合金; 熱傳導性質; 估算值; 熱平板法; Al-Si alloys; Thermal conductivity; Predication; Hot disk technique; |
| 語 文 | 中文(Chinese) |
| 中文摘要 | 汽車馬達外殼之熱傳導性質對於散熱影響甚大。為了開發具有良好熱傳導性質之鋁合金，本研究使用熱平板法量測，探討0-14 wt.%矽對於鋁矽合金熱傳導性質之影響，建立符合實際的估算模式。實驗結果顯示，隨著矽含量增加，熱傳導率從99.8%純鋁的213.5 W/m．K下降至Al-6 wt.% Si的161.3W/m．K，在Al-8~14 wt.% Si間呈154-157 W/m．K持平的現象；在顯微組織方面，當鋁矽合金中的矽含量低於4 wt.%時，矽以板片形式晶出，隨著Si含量增加，漸漸地以Al-Si共晶相為主，當超過共晶點（12.2 wt.%）時，則為過共晶成分組織。根據顯微組織的觀察，可將Al-Si合金以矽含量為0-4 wt.%、4-12 wt.%以及12-20 wt.%以上三個部分進行模擬，結合Effective Medium Approximations中的三種混合模式，本研究之估算值與量測值可以獲得最佳的吻合。估算的結果顯示顯微組織中，相組成排列與形狀對熱導率影響顯著。 |
| 英文摘要 | Thermal conductivity of motor housing has great influence on heat dissipation. In order to develop new die-cast aluminum alloys with adequate thermal conductivity, thermal conductivities of Al-0~14 wt.% Si alloys are investigated. Hot disk technique is employed to make thermal conductivity measurements. The result shows that the thermal conductivity decreases with silicon from 213.5 W/m．K in 99.8% purity aluminum to 161.3 W/m．K in Al-6 wt.% Si. It is further observed that the thermal conductivity stays at a nearly constant level of 154-157 W/m．K for Al-8~14 wt.%Si alloys. Si phase is found to be present in form of plates when Si content is lower than 4 wt.%. As the Si content increases, microstructures of Al-Si alloys gradually appear eutectic microstructures. When Si addition is over the eutectic concentration of 12 wt.%, blocky Si is observed in the hypereutectic microstructures. We divided Al-Si alloys into Al-0~4 wt.% Si, Al-4~12 wt.% Si and Al-12~20 wt.% Si, respectively, for simulations. By means of Effective Medium Approximations, we achieve optimal simulation predications. The distribution and shape of phases in microstructures remarkably affect thermal conductivities of Al-Si alloys. |
本系統中英文摘要資訊取自各篇刊載內容。