| 研究生: |
陳明宏 Chen, Ming-Hung |
|---|---|
| 論文名稱: |
添加Sb對Sn-Ag無鉛銲料銲點冶金性質與機械性質之研究 Study of Adding Sb into Lead-free Sn-Ag Solder Joints on Metallurgical and Mechanical Properties |
| 指導教授: |
李驊登
Lee, Hwa-Teng |
| 學位類別: |
博士 Doctor |
| 系所名稱: |
工學院 - 機械工程學系 Department of Mechanical Engineering |
| 論文出版年: | 2003 |
| 畢業學年度: | 91 |
| 語文別: | 中文 |
| 論文頁數: | 182 |
| 中文關鍵詞: | 破損分析 、剪切強度 、附著強度 、界面IMC層 、熱儲存 、冷卻率 、微結構 、Sn3.5Ag無鉛銲料 、Sn-Ag-Sb銲料 |
| 外文關鍵詞: | fractographic analysis, shear strength, adhesive strength, interfacial IMC layers, Sn3.5Ag lead-free solder, Sn-Ag-Sb solder, microstructure, cooling rate, thermal storage |
| 相關次數: | 點閱:216 下載:3 |
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本研究探討添加1 ~ 2 wt% Sb對Sn3.5Ag無鉛銲料熔點、硬度、微結構、銲點附著強度、剪切強度的影響,以及其對高溫熱儲存的抵抗能力。同時探討冷卻率對Sn-Ag銲料系微結構與硬度的影響,以及界面IMC層總厚度對銲點附著強度、剪切強度以及斷口形貌的影響。
實驗之銲料皆利用純元素(Sn 99.9wt%, Ag 99.99wt%, Sb 99.5wt%)秤取適當比例熔煉而成,再以ICP-AES進行成分確認。結果發現添加1~2 % Sb雖使Sn3.5Ag銲料的熔點上升,但也同時提高銲料硬度。Sb的添加不影響Ag3Sn化合物組成,Sb全部固溶於b-Sn中。205°C´625h儲存後,界面附近的Ag3Sn深腐蝕後呈現粗大的板狀,離界面較遠的Ag3Sn則呈現不規則的長條狀。不同冷卻率使Sn-Ag銲料系微結構,由細緻的環狀結構變成樹枝狀結構,再轉變成菊花狀的條紋組織。Ag3Sn的型態亦由細條狀變為長條狀、薄片狀。硬度變化方面,As-cast硬度以水淬最高,其次為空冷,爐冷則為最低。含Sb銲料與Cu銲接後,微量的Sb參與界面Cu6Sn5與Cu3Sn層的生長,使界面IMC層轉變為Cu6(Sb,Sn)5與Cu3(Sb,Sn)非化學計量型的化合物型態。
銲點強度方面,添加Sb有助於提升Sn-Ag銲點附著與剪切強度強度。經高溫長時間儲存後,添加Sb的銲點仍然具有較高的附著與剪切強度,且強度下降的速率亦較緩慢。此外,添加Sb的試件中,銲點附著強度與剪切強度在熱儲存過程中都出現了強度回升的現象。
斷口分析顯示銲點強度、界面IMC層厚度與斷口形貌間具有一定的關係存在。界面IMC層總厚度小於1.0 mm時,銲點具有最高的強度表現,破壞位置大約位於銲料與界面IMC層之間,斷口形貌大致平坦。總厚度介於1.0 ~ 10 mm時,銲點附著與剪切強度皆急遽下降,斷口出現韌窩形貌。總厚度高於10 mm時,銲點強度附著與剪切強度皆下降緩慢。銲點破壞的位置則轉移到界面IMC層內部,斷口也轉變成為劈裂形貌。
The work discussed the effect of adding 1 – 2 wt% Sb on the melting point temperature, hardness, microstructure, adhesive strength and shear strength of Sn3.5Ag solder and solder joints. The effect of cooling rate on the microstructure and hardness of Sn3.5Ag solder, as well as the relationship among the total thickness of interfacial IMC (Intermetallic Compound) layers, adhesive strength and shear strength of solder joint and fractography were discussed.
The solders were smelted from pure elements, i.e. Sn 99.9wt%, Ag 99.99wt%, Sb 99.5wt%, and the compositions were confirmed by ICP-AES. The results showed that adding 1-2 % Sb increased the melting point temperature of Sn3.5Ag solder, but the hardness were also enhanced. Adding Sb didn’t influence the composition of Ag3Sn that existed in the Sn3.5Ag solder, the added Sb atoms were solute into b-Sn completely. After 205°C´625h storage, the morphology of Ag3Sn that existed near the soldering interface appeared coarse plate, and the Ag3Sn that existed far away from the soldering interface appeared irregular rod. The experiment also revealed that the as-cast microstructure of Sn-Ag solder was governed by cooling rates. The microstructure changed from the ring-like structure to the dendrite structure, and finally to the chrysanthemum structure as the cooling rate slowed. The morphology of Ag3Sn also changed from needle-like to flake-like as the cooling rate slowed. The water-quenched hardness of Sn3.5Ag solder exhibited the highest hardness, and then air-cooling; the furnace cooling was the lowest. After soldering with Cu, there was a little Sb found in the interfacial Cu6Sn5 and Cu3Sn layers, which showed that adding Sb induced the Cu6Sn5 and Cu3Sn compound transforming to Cu6(Sb,Sn)5 and Cu3(Sb,Sn) non-stoichiometry compounds respectively.
Adding Sb also enhanced the adhesive and shear strength of Sn3.5Ag solder joint, even after long-term thermal storage the solder joints that contained Sb still exhibited higher strength and slower strength decreasing rate. Furthermore, the bouncing phenomenon of adhesive and shear strength of solder joints occurred in all Sb-contained solder joints during thermal storage.
Fractographic analysis revealed that there was a certain relationship existing among the total thickness of interfacial IMC layers, adhesive and shear strength of solder joints, and fractography. As the total thickness of interfacial IMC layers was smaller than 1.0 mm, the highest strength was obtained. The fracture occurred approximately along the interface between solder and interfacial IMC layers. The fractography appeared flat. As the thickness lay between 1.0 - 10 mm, the adhesive and shear strength of solder joints decrease rapidly, and the fractography appeared dimple morphology. Finally, as the thickness exceeded 10 mm, the strength of solder joints decreased slowly. The fracture moved to inside the interfacial IMC layers and the fractography appeared cleavage morphology.
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