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Low-melting-point low-cadmium silver solder containing rare earth elements

A rare earth element, silver solder technology, applied in welding/cutting media/materials, welding media, metal processing equipment, etc. Solve the problems of difficult processing of brazing materials, and achieve the effects of excellent wetting and spreading properties, excellent wetting and spreading properties, and good wetting and spreading properties.

Active Publication Date: 2017-05-31
金华市金钟焊接材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it does not have the value of large-scale application; the price of Sn element is not high and the reserves are abundant, but when added in large quantities, it is easy to form hard and brittle intermetallic compound Cu 6 sn 5 , resulting in "difficult processing" of silver solder, except that the addition amount of Sn in BAg60CuSn solder can reach 9.5% to 10.5%, and the general addition amount in Ag-Cu-Zn-Sn series solder is 1.5% to 2.5% %, for example, the addition of Sn in BAg56CuZnSn is 4.5% to 5.5% (see GB / T 10046-2008 "Silver Solder" Table 2)
[0004] So far, among the silver solders whose main components are Ag, Cu, Zn elements (excluding phosphorus elements), classified as GB / T 10046-2008, all silver solders with Li, In, Sn element content less than 0.15% , there is no report of low-silver solder with comprehensive properties such as wetting and spreading properties, mechanical properties of solder joints, solid phase and liquidus temperature close to BAg25CuZn solder

Method used

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  • Low-melting-point low-cadmium silver solder containing rare earth elements

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A low-melting low-cadmium silver solder containing rare earth elements, the mass percentage of each component of the low-cadmium silver solder is: 13.5wt.% of Ag, 49.0wt.% of Cu, 0.13wt.% of Cd, 0.001 wt.% In, 0.005 wt.% Ga, 0.001 wt.% Sn, 0.005 wt.% RE (Pr and / or Nd), the balance being Zn.

[0030] The rare earth element-containing low-melting low-cadmium silver brazing material obtained by the above composition ratio has a solidus temperature in the range of 720°C to 730°C and a liquidus temperature in the range of 775°C to 785°C. Use the flame brazing method, cooperate with FB102 flux, and see the data in the brackets for the brazing joint strength when the brazing base material is the following combination: copper-H62 brass (σb=225±25MPa, τ=215±30MPa), brass- Q235 steel (σb=280±25MPa, τ=300±30MPa), brass-304 stainless steel (σb=260±25MPa, τ=280±30MPa).

Embodiment 2

[0032] A low-melting low-cadmium silver solder containing rare earth elements, the mass percentage of each component of the low-cadmium silver solder is: 16.0wt.% of Ag, 45.0wt.% of Cu, 0.05wt.% of Cd, 0.005wt.% In, 0.001wt.% Ga, 0.005wt.% Sn, 0.001wt.% RE (Pr and / or Nd), the balance being Zn.

[0033] The rare earth element-containing low-melting low-cadmium silver brazing material obtained by the above composition ratio has a solidus temperature in the range of 720°C to 730°C and a liquidus temperature in the range of 775°C to 785°C. See the data in brackets for the strength of the brazing seam when the flame brazing method is used, with FB102 flux, and the brazing base material is the following combination: red copper-H62 brass (σ b =225±25MPa, τ=215±30MPa), brass-Q235 steel (σ b =280±25MPa, τ=300±30MPa), brass-304 stainless steel (σ b =260±25MPa, τ=280±30MPa).

Embodiment 3

[0035] A low-melting low-cadmium silver solder containing rare earth elements, the mass percentage of each component of the low-cadmium silver solder is: 14.5wt.% of Ag, 47.0wt.% of Cu, 0.1wt.% of Cd, 0.002wt.% In, 0.003wt.% Ga, 0.002wt.% Sn, 0.003wt.% RE (Pr and / or Nd), the balance being Zn.

[0036] The rare earth element-containing low-melting low-cadmium silver brazing material obtained by the above composition ratio has a solidus temperature in the range of 720°C to 730°C and a liquidus temperature in the range of 775°C to 785°C. See the data in brackets for the strength of the brazing seam when the flame brazing method is used, with FB102 flux, and the brazing base material is the following combination: red copper-H62 brass (σ b =225±25MPa, τ=215±30MPa), brass-Q235 steel (σ b =280±25MPa, τ=300±30MPa), brass-304 stainless steel (σ b =260±25MPa, τ=280±30MPa).

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Abstract

The invention relates to low-melting-point low-cadmium silver solder containing rare earth elements and aims to provide silver solder low in Cd content, approximate to liquidus temperature of BAg25CuZn solder, high in wettability and spreadability and excellent in soldered joint mechanical performance. The technical scheme includes that the low-melting-point low-cadmium silver solder containing the rare earth elements comprises, by weight, 13.5-16.0% of Ag, 45.0-49.0% of Cu, 0.05-0.13% of Cd, 0.001-0.005% of In, 0.001-0.005% of Ga, 0.001-0.005% of Sn, 0.001-0.005% of RE and the balance Zn, wherein RE refers to one or two of Pr and Nd.

Description

technical field [0001] The invention belongs to the technical field of brazing materials of metal materials, and in particular relates to a silver solder with a low melting point and low cadmium containing rare earth elements. Background technique [0002] The BAg25CuZn solder recommended in the published document GB / T 10046-2008 "Silver Solder" has a melting temperature range of 700 °C for solidus and 790 °C for liquidus, although its melting temperature range is not as good as that of BAg45CuZn solder ( The solidus is 665°C, the liquidus is 745°C), but it is still one of the solders that are very popular with solder users. However, due to the implementation of version 2.0 of the RoHS directive, which was reviewed and approved by the executive meeting of the Ministry of Industry and Information Technology of China, the Joint Development and Reform Commission, the Ministry of Science and Technology, the Ministry of Finance, the Ministry of Environmental Protection, the Minis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K35/40
CPCB23K35/0227B23K35/302B23K35/40
Inventor 骆静宜刘安琪骆华明
Owner 金华市金钟焊接材料有限公司
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