研究生: |
賴梅婷 Mei-Ting Lai |
---|---|
論文名稱: |
無鉛銲料與鎳鈀鈷合金之界面反應 Interfacial Reactions between Lead-Free Solders and the Ni-xPd-yCo Alloys |
指導教授: |
顏怡文
Yee-Wen Yen |
口試委員: |
陳信文
Sinn-Wen Chen 林士剛 Shih-Kang Lin 周振嘉 Chen-Chia Chou |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 材料科學與工程系 Department of Materials Science and Engineering |
論文出版年: | 2015 |
畢業學年度: | 103 |
語文別: | 中文 |
論文頁數: | 80 |
中文關鍵詞: | 無鉛銲料 、Ni-Pd-Co合金 、界面反應 |
外文關鍵詞: | Lead-free solders, Ni-Pd-Co alloys, interfacial reaction |
相關次數: | 點閱:569 下載:7 |
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在構裝技術中,為避免基材與銲點的界面反應,Ni常被作為擴散阻障層。有文獻指出微量Co的添加能改善銲點的機械性質。Pd層的導入能有效抑制介金屬相的生長,增加擴散阻障層之功能,然而目前尚未有文獻探討將Pd及Co元素添加至Ni基材中作為擴散阻障層。因此本研究以電弧融煉的方式來製備Ni-Pd-Co合金作為擴散阻障層之功效,並選用純Sn、Sn-3.0Ag-0.5Cu與Sn-9Zn三種無鉛銲料,與Ni-xPd-yCo基材於反應溫度240、270及300oC,分別進行30分鐘、1、2及5小時的液/固界面反應,並探討界面反應後之介金屬種類、反應機制、動力學、成長速率常數與反應活化能,並量測銲點的機械強度與潤濕性質,評估接點的可靠度。藉此了解Pd及Co金屬的添加對界面反應的影響,並提供未來Ni-Pd-Co合金應用在阻障層之相關資訊。
實驗結果顯示,在純Sn銲料系統中,生成之介金屬相為Ni3Sn4相。在SAC銲料系統,於240oC反應0.5-2小時所生成之介金屬相為(Cu, Ni)6Sn5相與(Ni, Cu)3Sn4相;而於240oC反應5小時及270、300oC反應時,界面處僅有(Ni, Cu)3Sn4相生成。在S9Z銲料系統,於240、270及300oC反應時所生成之介金屬相為Ni5Zn21相;在300oC反應5小時後所生成之介金屬相為Ni5Zn21、Sn及相,其中τ為Sn-Zn-Ni三元相。此三個系統之介金屬相厚度與反應時間之平方根呈線性關係,因此反應機制皆為擴散控制所主導。在可靠度試驗中,由結果可知Pd及Co的添加與銲料破斷的剪切強度相關。在潤濕性質試驗中,由結果知Pd及Co的添加使表面張力下降,促使銲料與基材的接觸面積增加,並提升其潤濕性質。
Ni is widely used as a diffusion barrier to avoid interfacial reaction between solders and the substrate in the packaging technology. In addition, there are studies regarding improving the reliability of lead-free solder joint by adding Co and Co-based alloys. Adding Pd can improve the wettability and suppress the formation of intermetallic compound. However, doping the Pd and Co elements to Ni substrate as a diffusion barrier has not been studied yet. The Ni-xPd-yCo alloys are prepared by arc melting. This study investigated the interfacial reactions of Sn/Ni-xPd-yCo, SAC/Ni-xPd-yCo and SZ/Ni-xPd-yCo reacted at 240, 270 and 300oC for 30 min, 1, 2 and 5 h.
According to the results, the Ni3Sn4 phase was formed at the interface in the Sn/Ni-xPd-yCo system. In the SAC/Ni-xPd system, the (Cu, Ni)6Sn5 and (Ni, Cu)3Sn4 phases were formed at 240oC. When the reaction couples reacted at 270 and 300oC, only (Ni, Cu)3Sn4 phase formed at interface. In the SZ/Ni-xPd-yCo system, the Ni5Zn21 phase formed at the interface when the reaction couples reacted at 240, 270 and 300oC. After reacted at 300oC for 5 h, the Ni5Zn21, Sn and τ phases were formed at the interface. The thickness of intermetallic compounds increased with longer reaction times and higher temperatures. Also, the thickness was proportional to the square root of reaction time. The interfacial reaction mechanism was diffusion controlled. In the reliability test, the thin reaction phase enhanced the stress. In the wettability test, adding Pd and Co had lower surface tension.
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