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Oxidation resistance tin-based no-lead solder capable of proceeding welding without welding flux in air

A technology based on lead-free solder and lead-free solder, which is applied in the direction of welding/cutting medium/material, welding medium, welding equipment, etc., can solve the problems of ceramics containing and cannot be directly welded, achieve light oxidation of workpieces, improve connection quality and performance, avoiding complex effects of process and equipment

Inactive Publication Date: 2007-02-07
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method has the following disadvantages: 1. It needs to be welded under protective atmosphere conditions; 2. The above methods cannot directly weld nonmetals such as ceramics
[0004] Although the solder disclosed in the patent document WO9703789 (Alloy, in particular a solder alloy, method for joining workpieces by soldering using the solder alloy and use of the alloy for soldering) can solder most non-metallic materials such as metals and ceramics without using flux Combination, but the composition disclosed in this patent document contains lead element, and it is necessary to take measures to protect the gas or remove surface oxides during the welding process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0017] In the third preparation step of vacuum smelting, Sn, Ag, Ti, and Y elements can be smelted in the furnace for about one to five times according to the amount of solder, so that the solder can be smelted evenly.

[0018] In order to compare the oxidation resistance of the solder after adding the anti-oxidation element Y, the inventors compared the Sn-4wt%Ag-4wt%Ti solder and the Sn-4wt%Ag-4wt%Ti-0.5wt%Y solder at a soldering temperature of 250°C Under the conditions, the thickness of the oxide film on the surface of the solder after heating (analyzed by Auger electron spectroscopy), under the same process specification conditions, the thickness of the oxide film on the surface of the Sn-4wt%Ag-4wt%Ti solder has reached 59nm, However, the thickness of the oxide layer on the surface of the Sn-4wt%Ag-4wt%Ti-0.5wt%Y solder is only 12nm. This proves that the Sn-4wt%Ag-4wt%Ti-0.5wt%Y solder disclosed in the present invention has good oxidation resistance. The addition of the...

Embodiment 1

[0021] Embodiment 1: making Sn-4wt%Ag-2wt%Ti-0.5wt%Y solder

[0022] Weigh Sn, Ag, Ti and Y materials by weight, put them into a non-consumable vacuum electric arc furnace, and evacuate to 1×10 -2 , filled with high-purity argon; adjust the melting temperature to 1500 ° C, and the melting time is 10 minutes; the material in the furnace is smelted evenly and cast into an ingot, which is taken out after cooling with the furnace; then, the Sn-4wt%Ag-2wt% The Ti-0.5wt%Y solder ingot was rolled into thin slices of 25mm×5mm×0.5mm.

[0023] Use the above-mentioned Sn-4wt%Ag-2wt%Ti-0.5wt%Y solder for different welding objects, and heat the welding objects with a temperature-controlled resistance furnace. The shear strength of the welded joints is shown in the following table:

[0024] welding object

[0025] Test conditions: After welding the different welding objects in the above table with solder, use the MTS-880 universal material testing machine to test the shear streng...

Embodiment 2

[0026] Embodiment 2: making Sn-6wt%Ag-6wt%Ti-2.5wt%Y solder

[0027] Weigh Sn, Ag, Ti and Y materials by weight and put them into a non-consumable vacuum electric arc furnace, and vacuumize to 5×10 -2 , filled with high-purity argon; adjust the melting temperature to 1500 ° C, and the melting time is 10 minutes; the material in the furnace is melted evenly and cast into an ingot, which is taken out after cooling with the furnace; then, the Sn-6wt%Ag-6wt% The Ti-2.5wt%Y solder ingot was rolled into thin slices of 25mm×5mm×0.5mm.

[0028] welding object

[0029] Test conditions: After welding the different welding objects in the above table with solder, use the MTS-880 universal material testing machine to test the shear strength of the welded joint of the above-mentioned Sn-6wt%Ag-6wt%Ti-2.5wt%Y solder.

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Abstract

The invention relates to an antioxidized solder base non-lead welding solder which can weld in air without welding solder, wherein it is formed by Ag at 0.1-6 deals, Ti at 0.5-6 deals and Y in 0.1-2.5 deals and the Sn. It can avoid any welding solder in air, and it can weld material directly at 24-260Deg. C; the connector shearing strength of said invention is 30-50MPa.

Description

technical field [0001] The invention belongs to the field of welding and relates to a brazing material. Specifically, it refers to a combination of similar and dissimilar materials that can directly weld metal and metal, metal and non-metal, non-metal and non-metal in the air without using any flux, especially suitable for welding between ceramics and ceramics, ceramics and metals Oxidation-resistant tin-based lead-free solder. Background technique [0002] Since lead and its compounds in tin-lead solder are highly toxic substances, which seriously endanger the living environment and safety of human beings, countries all over the world have banned the use of lead-containing solder. Therefore, a series of lead-free solders have been developed at home and abroad, such as Sn-Zn, Sn-Ag, Sn-Ag-Cu, etc., but these solders can only solder metals, and flux must be used. The flux may cause environmental pollution, and some fluxes also need to be cleaned after welding, and the clean...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/26B23K1/19
Inventor 曲文卿庄鸿寿齐志刚
Owner BEIHANG UNIV
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