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Department of Sn-Zn and Sn-Cu based lead-free solder developed

Author: ZhouGanYu
Tutor: ZhangSiZuo
School: Central South University
Course: Materials Science
Keywords: Lead-free solder Sn-Zn eutectic alloy Sn-Zn-Al alloy Corrosion resistance Sn-Cu eutectic alloy Performance
CLC: TG421
Type: Master's thesis
Year: 2004
Downloads: 271
Quote: 4
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Abstract


Lead and its alloys toxic , with the improvement of legislative restrictions and technical requirements , lead-free solder developed new practical alternative to traditional Sn-Pb solder become a research hotspot in recent years . Paper Sn-9Zn, Sn-0.7Cu base , adding the alloying elements of Bi, Al, Ag , etc. , developed a total of 15 kinds of different components of the lead - free solder alloy . Melting point and determination of the mechanical properties and spreadability , oxidation resistance and electrochemical experiments investigated the impact of alloying elements on the microstructure and properties of the developed , the results showed that: with increasing Bi content , Sn-Zn eutectic alloy and Sn -Cu eutectic alloy melting point decreased , the tensile strength increased , improved spreadability , but the melting temperature interval will be gradually increased , plastic lower reduce the corrosion resistance and oxidation resistance ; AG Sn-Zn-Bi -based alloy , and Sn -Cu-Bi based alloy tensile strength increased , and the elongation decreased . The small amount of Ag no significant effect on the melting point of the alloy . Ag added to improve the oxidation resistance and corrosion resistance of the Sn-Zn-Bi based alloy ; Al added to improve the tensile strength of Sn-Zn eutectic alloy , oxidation resistance , but the elongation is slightly decreased , but were is greater than the use requirements, i.e. greater than 10% elongation . Add Re and Zr does not generate the high melting point phase . Re added better improving effect on alloy corrosion resistance , and the role of Zr is less obvious ; Sn-9Zn-4Bi-0.5Ag, Sn-0.7Cu-5Bi and the Sn-8.5Zn-0.878Al-0.122Re experimental alloy of better overall performance.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Welding, metal cutting and metal bonding > Welding materials > Welding materials
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