錫-銻/鈷-鐵之界面反應與錫-銻-鐵三元系統相平衡

Interfacial Reactions in Sn-Sb/Co-Fe Couples and Phase Equilibria of the Sn-Sb-Fe Ternary System

張凱(Kai Zhang)

指導教授 ： 陳志吉

中原大學/工學院/化學工程研究所/碩士(2016年)

摘要

本論文探討Sn-Sb-Fe三元系統在300oC下之相平衡與Sn-Sb/Co-Fe反應偶之界面反應。在Sn-Sb-Fe三元系統於300oC下之相平衡研究中，共決定出4個三相區、13個兩相區以及10個單相區。Sb於液相、FeSn2、FeSn相中之最大溶解度分別為13.7at%、9.9at%與7.9at%。Sn於Sb相中之最大溶解度約為8.5at%，Fe對於Sn、Sb最大溶解度各約為2at%。其他的穩定相皆無明顯的第三元溶解度。
在Sn-Sb/Co-Fe的整體界面反應研究中，針對Sn-5wt%Sb和Sn-10wt%Sb與不同比例下的Co-xwt%Fe合金基材(x=5, 10)做探討，實驗結果顯示Sn-Sb/Co-Fe界面反應與Sn-Sb/Co不同。在300oC下，當銲料為Sn-5wt%Sb時，界面處生成CoSn3相。當銲料為Sn-10wt%Sb時，在界面處則是生成以Sb為主的生成相CoSb3相與Sn-Sb-Co三元系統的三元穩定相π相，在銲料中析出Sn3Sb2相。固/固界面反應，Sn-5wt%Sb時，在界面處生成π相，反應活化能為15.9kJ/mol; Sn-10wt%Sb時，界面處是生成π相，反應活化能為35.6kJ/mol。各溫度下，在銲料中加入較多的Sb都能夠有效的降低反應速率。
Sn-Sb/Co-Fe界面反應生成CoSb3相，CoSb3為一方鈷礦(Skutterudite)型結構，具有良好的熱電性質，本研究之結果可以提供製備具有良好熱電性質材料之參考。

關鍵字

界面反應、Sn-Sb-Fe三元相平衡、方鈷礦

並列摘要

This thesis investigates the interfacial reactions in Sn-Sb/Co-Fe couples and the phase equilibria of the Sn-Sb-Fe ternary system at 300oC. In Sn-Sb-Fe phase equilibria study at 300oC, 4 three-phase, 13 two-phase, and 10 single-phase regions are determined experimentally. Sb solubility in the liquid, FeSn2 and FeSn phases are 13.7, 9.9, and 7.9at%, respectively. Sn solubility in the Sb phase is about 8.5at%. Fe solubility in the liquid and Sb phases are 2 and 2at%, respectively. No noticeable ternary solubility is found in the other binary phases.
The interfacial reactions in Sn-Sb/Co-Fe couples are different from those of Sn-Sb/Co. In Sn-10wt%Sb/Co-Fe couples at 300oC, the reaction phases are the CoSb3 phase and a Sn-Sb-Co ternary phase (π). In Sn-Sb/Co-Fe aging tests, the main reaction phase is the π phase, and the activation energies are 15.9 and 35.6 kJ/mol in Sn-5wt%Sb/Co-Fe and Sn-10wt%Sb/Co-Fe couples, respectively. The reaction phase thickness effectively decreases with greater Sb additions.
The CoSb3 phase is a Skutterudite compound, which has good thermoelectric properties. The result of this study can be used as a reference to prepare the thermoelectric materials.

並列關鍵字

Phase equilibria, Co-Fe, Sn-Sb

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