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Nanoscale/micron size particle mixing type lead-free solder paste with size effect and manufacturing method thereof

A lead-free solder, size effect technology, applied in welding/cutting media/materials, welding equipment, manufacturing tools, etc., can solve the problems of organic residue precipitation, low metal content, and difficulty in forming complete and full solder joints. Achieve the effect of simple and feasible process, increase specific gravity, and avoid premature failure

Active Publication Date: 2014-03-19
马鑫 +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the size of the nanoparticles is too small, the surfactant will occupy a relatively large proportion of the volume. If the flux is directly added to the nano-powder and stirred evenly, the content of metal components in the nano-solder paste will be too low, and it will be difficult to form a complete solder paste after soldering. Full solder joints, and there will be a lot of organic residues [Materials Science and Engineering B177(2012)197-204]
It is also for this reason that there has not yet been a real nano-lead-free solder paste.

Method used

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  • Nanoscale/micron size particle mixing type lead-free solder paste with size effect and manufacturing method thereof
  • Nanoscale/micron size particle mixing type lead-free solder paste with size effect and manufacturing method thereof
  • Nanoscale/micron size particle mixing type lead-free solder paste with size effect and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The nano / micron particle mixed type lead-free solder paste of the present embodiment is composed of Sn-3.0Ag-0.5Cu nano-solder powder (particle diameter is 5-15nm), Sn-3.0Ag-0.5Cu lead-free solder powder (particle diameter 25-45μm), composed of rosin flux, with a total mass of 5g, and its components are calculated by mass fraction as:

[0039] Nano lead-free solder Sn-3.0Ag-0.5Cu 30%

[0040] Micron lead-free solder Sn-3.0Ag-0.5Cu 60%

[0041] Rosin type solder paste 10%

[0042] Among them, the micron lead-free solder Sn-3.0Ag-0.5Cu used has a melting temperature range of 217-221°C, and the experimental steps are as follows:

[0043] First, separate the nano-lead-free solder stored in ethylene glycol liquid, and select stearic acid as the separation solution; slowly add the nano-lead-free solder to the solder paste / agent, and mechanically stir at a speed of 30r / min 30min, then introduce ultrasonic oscillation, continue stirring for 30min, then stop ultrasonic oscill...

Embodiment 2

[0046] The nano / micron particle mixed type lead-free solder paste of the present embodiment is composed of Sn nano-solder powder (particle diameter is 5-15nm), Sn-1.0Ag-0.5Cu-0.01Ni micron lead-free solder powder (particle diameter is 25nm) -38μm), composed of rosin flux, with a total mass of 5g, and its components are calculated by mass fraction as:

[0047] Nano lead-free solder Sn 35%

[0048] Micron lead-free solder Sn-1.0Ag-0.5Cu-0.01Ni 55%

[0049] Rosin type solder paste 10%

[0050] Among them, the micron lead-free solder Sn-1.0Ag-0.5Cu-0.01Ni used in this example has a melting temperature range of 217-225°C, and the experimental steps are:

[0051] First, separate the nano-lead-free solder stored in ethylene glycol liquid, and choose stearic acid as the separation solution; slowly add the nano-lead-free solder to the rosin-type solder paste, and mechanically stir at a speed of 30r / min 30min, then introduce ultrasonic oscillation, continue stirring for 30min, then s...

Embodiment 3

[0054] The nano / micron particle mixed type lead-free solder paste of the present embodiment is composed of Sn nano-solder powder (particle size is 5-15nm), Sn-3.5Cu lead-free solder powder (particle size is 25-45 μm), rosin Flux composition, the total mass is 5g, and its components are calculated by mass fraction as:

[0055] Nano lead-free solder Sn 45%

[0056] Micron lead-free solder Sn-3.5Cu 45%

[0057] Rosin type solder paste 10%

[0058] Among them, the micron lead-free solder Sn-3.5Ag used in this example has a melting temperature of 221°C, and the experimental steps are as follows:

[0059] First, separate the nano-lead-free solder stored in ethylene glycol liquid, and select stearic acid as the separation solution; slowly add the nano-lead-free solder to the solder paste / agent, and mechanically stir at a speed of 30r / min 30min, then introduce ultrasonic oscillation, continue stirring for 30min, then stop ultrasonic oscillation, slowly add micron-sized solder / paste...

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Abstract

The invention provides nanoscale / micron size particle mixing type lead-free solder paste with a size effect and a manufacturing method thereof. The method comprises the following steps that nanoscale solder is slowly added into solder flux or a solder agent, after mechanical mixing, ultrasonic oscillation is lead in, mixing is continued, then the ultrasonic oscillation is stopped, micron size solder / flux is slowly added, and the mixed type solder paste which is uniformly mixed is obtained through continuously mixing. The manufacturing method has the advantages that process of the method is simple and feasible, the large size micron size solder is added in the nanoscale solder paste, the proportion of metal components in the solder paste is improved, and the low-melting-point property of nanometer brazing filler metal is maintained; mellow and full solder dots are formed at the low reflow soldering temperature; the obtained solder dots are polycrystal solder dots, and the grain sizes in the solder dots can be changed by adjusting the size distribution of micron size nanoscale solder, so that advance failure of the solder dots is avoided.

Description

technical field [0001] The invention belongs to the technical field of lead-free solder alloys and electronic packaging, and relates to a preparation and application method of nano-scale / micron-scale particle mixed type lead-free solder paste with size effect. Background technique [0002] With the in-depth understanding of the toxicity of Pb in the society and the implementation of the EU WEEE / ROHS Act on July 1, 2006, it is the general trend to replace the traditional Sn-Pb solder with lead-free solder. At present, lead-free alloys such as Sn-Ag, Sn-Cu, and Sn-Ag-Cu have been widely used in the field of electronic packaging. The melting point of these lead-free solder alloys is generally 217-227°C, which is much higher than the melting point of the traditional Sn-Pb eutectic solder (183°C). Therefore, the use of lead-free solder has brought new problems after solving environmental problems. . First of all, the increased soldering temperature is not conducive to energy sa...

Claims

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Application Information

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IPC IPC(8): B23K35/26B23K35/14B22F1/052B22F1/054
CPCB23K35/0244B23K35/262B23K35/362B23K2101/36B22F1/052B22F1/054B23K35/26C22C9/02
Inventor 马鑫李明雨杨明
Owner 马鑫
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