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Method for adding trace elements during preparation of composite lead-free solder

A technology of lead-free solder and trace elements, which is applied in the field of materials, can solve the problems of harsh addition methods, poor wettability, and unsuitability for industrial production promotion and application, and achieve the effect of reducing processing costs and ensuring the effect of addition

Active Publication Date: 2015-05-20
YIK SHING TAT INDUSTRIALCO LTD +3
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Problems solved by technology

However, the above-mentioned composite lead-free solder itself also has certain shortcomings, such as poor wettability, high brittleness, etc., which have seriously affected its industrial production and promotion.
[0004] Experimental research has found that changing the composition of the above-mentioned composite lead-free solder and adding trace metal elements or rare earth elements to the composite lead-free solder overcomes the above-mentioned defects, but the addition method is demanding, and the most important method is the method of vacuum furnace smelting. Such as patent application CN00129872.0 and other prior art disclosed technical solutions, generally smelted in a vacuum furnace protected by a nitrogen atmosphere, although this method can be added with trace metal elements or rare earth elements to obtain composite lead-free solder that meets the requirements, but for The requirements for equipment and operators are high and the cost is high, so it is not suitable for popularization and application in industrial production

Method used

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  • Method for adding trace elements during preparation of composite lead-free solder
  • Method for adding trace elements during preparation of composite lead-free solder
  • Method for adding trace elements during preparation of composite lead-free solder

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Embodiment 1

[0035] Based on the above considerations, we have invented this addition method through a large number of experimental attempts and data analysis. Through this addition method, the pure active metal element lanthanum powder in the air atmosphere is successfully added into the brazing filler metal to obtain the same melting temperature as that of vacuum smelting. Compound composition and distribution.

[0036] The method specifically includes the following steps (taking adding highly active pure rare earth lanthanum powder to SnAgCu0307 as an example, the steps of metal elements in other component solders are similar):

[0037] according to figure 1 and 2 (1), seven groups of composite lead-free solder SnAgCu0307 (0106) weighing 30g are used as the experimental base material, seven parts of anti-oxidation protection salt KCl are weighed, each part of 2.6g; seven parts of LiCl salt, each part of 2g (0105 ). Mix the two salts and cover the previous composite lead-free solder, ...

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Abstract

The invention relates to a method for adding trace elements during the preparation of composite lead-free solder. According to the method, the trace elements can be added to the composite lead-free solder through carrying out high-temperature smelting in an air atmosphere by using an auxiliary adding tool, wherein the auxiliary adding tool is a composite sleeve, the lower part of the composite sleeve is provided with a ceramic tube, the upper part of the composite sleeve is provided with a soft plastic tube with a sealable top cover, and a member with high airtight performance is connected between the plastic tube and the ceramic tube and can guarantee air tightness at the air pressure of 1,500 pa. The method has the advantages that the used equipment is conventional and general equipment and is low in cost and strong in transportability, and the difficult problem that the performance of solder can not be improved caused by the fact that the trace elements with high activity can not be added to the composite lead-free solder during industrial production is solved.

Description

technical field [0001] The invention belongs to the technical field of materials and relates to a method for adding trace elements in the preparation process of composite lead-free solder. Background technique [0002] At present, with the gradual enhancement of people's awareness of environmental protection, the traditional tin-lead solder SnPb has been widely valued by countries all over the world because of its toxic effects on nature and human body. According to the WEEE and RoHS directives promulgated by the European Union, it is clearly proposed to restrict or prohibit the use of lead-containing toxic and harmful substances in household appliances from July 1, 2006. subject. [0003] After a lot of research, it was found that the ternary alloy SnAgCu series, the binary alloy SnCu series, the SnAg series, the SnZn series and other composite lead-free solders are used because of their relatively low melting point, high reliability of solder joints, and thermal fatigue r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02B23K35/40
Inventor 马鑫陈宏涛胡天麒李明雨杨明
Owner YIK SHING TAT INDUSTRIALCO LTD
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