Addition of nickel(Ni) into solder
- Ni increases the wettability of the solder on Cu and Ni substrates.
- Ni decreases the wettability of the SAC305 solder on Cu substrates.
- Ni has also been an effective alloy element for SAC and Sn-Zn-Cu solder to refine the microstructures.
- Ni suppressed the growth of intermetallic compounds between SAC305and Sn-Zn-Bi solder and Cu substrates during thermal aging but it increased the growth of intermetallic compounds between Sn-Cu and Cu substrate.
- addition of ni into Sn-Cu solder reduces the solubility of copper substrate
Addition of silver(Ag) into solder
- Ag is a high price element and has been used as a composition of many kinds of high-cost solders.
- Addition of Ag into solder such as Sn-9Zn, Sn-5Sb and Sn-10Sb-8Cu decreases their melting temperature and increases wettability.
- Addition of Ag into Sn-9Zn decreases the tensile strength and elongation of the solder.
- Addition of Ag into Sn-5Sb and Sn-0.7Cu solders increased their tensile strength and elongation.
- Solders with a large amount of Ag formed the brittle Ag3Sn that initiated fracture of solder joint and gave a dull surface of solder joint.
Addition of indium(In) into solder
- In is another high price element.
- Addition of In into Sn-8.6Zn and Sn-0.3Ag-0.7Cu solders reduced the melting temperature and improved the wettability of the solders. The melting range of the solders was wider with the addition of In.
- Eutectic structure of Sn-8.6Zn was coarser while microstructure of Sn-0.3Ag-0.7Cu was finer.
- In inhibited the consumption of Cu substrate during soldering.
- Addition of In into 3.5Ag-0.5Cu decreased volume of intermetallic compound in the bulk solder.
- Microhardnees of Sn-0.3Ag-0.7Cu and Sn-Sb solder was increased with the increase of In.
- Microhardnees was decreased in the increase of aging time due the coarsening of the microstructure and the dissolution of Cu6Sn5 intermetallic phase.
- In decreased the growth rate of Cu3Sn at the interface of Sn-Ag-Cu solders with Cu substrate
Objectives
1. To investigate effect of Ni, Ag and In on interfacial reaction between Su-Bi-Ni-X solder and Cu substrate.
2. To investigate effect of Ni, Ag and In on interfacial reaction between Su-Bi-Ni-X solder and Pb-coated substrate.
Scope of research
This research project will study on effect of Ni, Ag, and In on properties of Sn-Bi-Ni-X to develop a new type of lead-free solder.Sn-58Bi will be used s the basic solder, and alloying elements will be Ni, Ag and In. Ni will be employed as the primary alloying elements, and added to the basic solder within 0-1 wt%. Ag and In will be used as the secondary alloying element, and mixed to the basic solder with the concentration of 0.05 or 0.10 wt%. Cu plate with 99.99% in purity will be used as the substrate, and it will be electroplated with Pb of 99.99% in purity to be used as another type of substrate.
The benefits expected to be received
1. Get knowledge about the development of a new type of lead-free solders
2. An additional alternative to industrial metal in soldering
Addition of nickel(Ni) into solder
- Ni increases the wettability of the solder on Cu and Ni substrates.
- Ni decreases the wettability of the SAC305 solder on Cu substrates.
- Ni has also been an effective alloy element for SAC and Sn-Zn-Cu solder to refine the microstructures.
- Ni suppressed the growth of intermetallic compounds between SAC305and Sn-Zn-Bi solder and Cu substrates during thermal aging but it increased the growth of intermetallic compounds between Sn-Cu and Cu substrate.
- addition of ni into Sn-Cu solder reduces the solubility of copper substrate
Addition of silver(Ag) into solder
- Ag is a high price element and has been used as a composition of many kinds of high-cost solders.
- Addition of Ag into solder such as Sn-9Zn, Sn-5Sb and Sn-10Sb-8Cu decreases their melting temperature and increases wettability.
- Addition of Ag into Sn-9Zn decreases the tensile strength and elongation of the solder.
- Addition of Ag into Sn-5Sb and Sn-0.7Cu solders increased their tensile strength and elongation.
- Solders with a large amount of Ag formed the brittle Ag3Sn that initiated fracture of solder joint and gave a dull surface of solder joint.
Addition of indium(In) into solder
- In is another high price element.
- Addition of In into Sn-8.6Zn and Sn-0.3Ag-0.7Cu solders reduced the melting temperature and improved the wettability of the solders. The melting range of the solders was wider with the addition of In.
- Eutectic structure of Sn-8.6Zn was coarser while microstructure of Sn-0.3Ag-0.7Cu was finer.
- In inhibited the consumption of Cu substrate during soldering.
- Addition of In into 3.5Ag-0.5Cu decreased volume of intermetallic compound in the bulk solder.
- Microhardnees of Sn-0.3Ag-0.7Cu and Sn-Sb solder was increased with the increase of In.
- Microhardnees was decreased in the increase of aging time due the coarsening of the microstructure and the dissolution of Cu6Sn5 intermetallic phase.
- In decreased the growth rate of Cu3Sn at the interface of Sn-Ag-Cu solders with Cu substrate
Objectives
1. To investigate effect of Ni, Ag and In on interfacial reaction between Su-Bi-Ni-X solder and Cu substrate.
2. To investigate effect of Ni, Ag and In on interfacial reaction between Su-Bi-Ni-X solder and Pb-coated substrate.
Scope of research
This research project will study on effect of Ni, Ag, and In on properties of Sn-Bi-Ni-X to develop a new type of lead-free solder.Sn-58Bi will be used s the basic solder, and alloying elements will be Ni, Ag and In. Ni will be employed as the primary alloying elements, and added to the basic solder within 0-1 wt%. Ag and In will be used as the secondary alloying element, and mixed to the basic solder with the concentration of 0.05 or 0.10 wt%. Cu plate with 99.99% in purity will be used as the substrate, and it will be electroplated with Pb of 99.99% in purity to be used as another type of substrate.
The benefits expected to be received
1. Get knowledge about the development of a new type of lead-free solders
2. An additional alternative to industrial metal in soldering
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