CN1120596A - Heat resistance soft solder lead-base alloy - Google Patents
Heat resistance soft solder lead-base alloy Download PDFInfo
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- CN1120596A CN1120596A CN 95105291 CN95105291A CN1120596A CN 1120596 A CN1120596 A CN 1120596A CN 95105291 CN95105291 CN 95105291 CN 95105291 A CN95105291 A CN 95105291A CN 1120596 A CN1120596 A CN 1120596A
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- solder
- base alloy
- soft solder
- alloy
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Abstract
The Pb-base alloy as heat resistant soft solder for soldering mother metal such as copper and steel, especiallys tainless steel contains such components (Wt.%) as Sn (2.0-9.0), Sb (0.2-5.0), Cu (0.3-2.0), P (0.001-0.3), and Pb (the rest) and features no content of toxic element Cd and noble metal, low cost and soldering temp. and high working temp.
Description
The present invention relates to the soldering lead 2-base alloy, be particularly related to 315～345 ℃ of temperature of fusion, a brazing filler metal working temperature is higher than 250 ℃ soldering lead 2-base alloy, be used for copper, the soldering of metal mother metals such as steel, particularly the soldering of mother metal such as stainless steel is used for the parts soldering in military project, electronics, weaving, chemical industry and the mechanical industry.
As everyone knows, temperature of fusion is lower than that 450 ℃ solder is many to be formed by tin is plumbous.For example, " lead base eutectic solder summary " (copper processing, 1989, (1), 165-172) the bibliographical information situation of lead base binary, ternary and polynary low melting point alloy scolder summarized in a literary composition, relates to solders such as Pb-Sn two component system, Pb-Sn-Ag, Pb-Sn-Sb, Pb-Ag-Bi, Pb-Sn-Cd three component system and Pb-Sn-Ag-Cd quaternary system.Though these solders also belong to eutectic solder, the warm area that it was suitable for is lower, and its brazing temperature is all below 300 ℃, work (heat-resisting) temperature＜150 ℃.And also there is following problems in above-mentioned solder: (1) contains precious metal element, and as Ag, so cost is higher; (2) contain poisonous element, poisonous as cadmium, cadmium element, infringement HUMAN HEALTH and cause environmental pollution.For this reason, many countries have carried out the research work that alternative Ag5Cd etc. does not contain the heat-resisting soft solder of Ag, Cd in succession.For example, GB2174109 discloses a kind of zinc-base heat-resisting soft solder, but the molten temperature of fusion of solder too high (400～500 ℃).USSR (Union of Soviet Socialist Republics) SU407689 discloses a kind of heat-resisting soft solder, and its composition is (weight %) Ni0.1～0.3, Cu0.1～0.2, and Zn0.5～2.0, Pb surplus, its shortcoming are that fragility is bigger, are difficult to process.The spy opens clear 5509445 and has proposed a kind of Sn-Bi-Ti-Pb quaternary lead base heat-resisting soft solder, but its heat resisting temperature only is 210 ℃.Te Kaiping 3-204194 discloses the good slicker solder base alloy of a kind of thermal fatigue property, and its principal constituent is (weight %) Sn1～60, Sb0.01～10, Pb surplus; In addition, on above-mentioned alloying constituent basis, also can add Cu, Ni, Au, Ag, Pt, Pd, Mg, Ca, Li, La, Ce, Cd, Co, Cr, Fe, Mn, Se, Te, one or more in the Zr element, content 0.07～7%.But this solder mainly is heat-resistant anti-fatigue and the creep-resistant property that improves alloy, does not have the data such as temperature of fusion, working temperature and tensile strength of solder, and this solder is mainly used in the electronic component welding.
The objective of the invention is to overcome the above-mentioned shortcoming that prior art exists, a kind of heat-resisting soft solder that does not contain poisonous Elements C d and precious metals ag is proposed, its temperature of fusion low (315～345 ℃), and heat resisting temperature height (250～280 ℃), with weld seam light, the densification of this solder welding, wettability is good.
Technical scheme of the present invention is, changes alloying constituent on conventional P b-Sn alloy basis, proposes a kind of new lead 2-base alloy solder, feature of the present invention is that alloying constituent (weight %) is Sn2.0～9.0, Sb0.2～5.0, Cu0.3～2.0, P0.001～0.3, Pb surplus.
In the Pb-Sn matrix alloy, add Sb, can reduce the surface tension of solder, and in alloy, form intermetallics SnSb, be dispersion state and separate out, become the grain boundary; Add Cu and P easy and tin formation compound, can disperse separate out the compound of Cu, P and Sn, thereby improve thermotolerance, solidity to corrosion, wettability and the intensity of solder alloy along the crystal boundary that SnSb forms.
The adding energy and the tin of copper form white needles intermetallics Cu6Sn5, and it can prevent the come-up of SnSb, improves segregation, improves the solder temperature of fusion, increases heat resisting temperature and hardness.Be lower than 0.3% as copper content, the intermetallics amount of separating out is few, does not reach desired effects; If copper content is higher than 2%, then do not reach dispersion state, produce segregation, make the solder alloy embrittlement, be difficult to process.
The adding of P plays reductive action to most of metal oxides, thereby improves the resistance of oxidation and the flowability of solder, can make finished surface smooth.Less than 0.001%, do not reach oxidation resistant effect as P content, as greater than 0.3%, then produce segregation, the solder embrittlement.
Compare with prior art, solder alloy of the present invention has following advantage:
1. alloy of the present invention does not contain poisonous Elements C d;
2. alloy of the present invention does not conform to precious metals ag, and is with low cost;
3. alloy melting temperature of the present invention low (315～345 ℃), heat-resisting (work) temperature height (250～280 ℃).
Embodiment 1～5
Press shown in the table 1 each alloying element is mixed, founding becomes alloy pig, by the extruding or rolling after make the cored solder wire of diameter 1～3mm and the soldering band of 70 * 0.1 * 20mm, use several metals of above-mentioned solder brazing (copper, steel etc.) then, the butt welded seam section carries out metallographicobservation, as seen weld seam causes honey, no rosin joint, no slag inclusion.
With the solder of embodiment 1～5 and the solder difference brazed joint of Comparative Examples 1 (Ag3Pb97) and 2 (Ag5Cd95), under differing temps, measure the intensity of each brazing filler metal head, it the results are shown in Table 2.
Table 1
Alloying constituent (weight %) specimen coding
Sn Cu Sb P Pb embodiment 1 7.0 0.3 5 0.3 surplus embodiment 242 0.2 0.02 surplus embodiment 321 0.5 0.13 surplus embodiment 49 0.9 0.8 0.001 surplus embodiment 55 0.5 2.0 0.1 surpluses
Brazed joint intensity (MPa) under table 2 differing temps
150 ℃ of 200 ℃ of 250 ℃ of specimen codings of room temperature
Shearing resistance tension shearing resistance tension shearing resistance tension shearing resistance tension embodiment 1 19.2 20.1 8.5 19.0 4.3 10.0 4.7 5.7 embodiment 2 20.1 22.0 9.0 18.6 4.7 10.4 5.4 5.6 embodiment 3 21.0 25.0 9.2 20.5 5.0 11.0 5.6 6.0 embodiment 4 18.9 20.0 8.1 18.0 4.2 10.3 4.1 5.0 embodiment 5 19.0 23.0 9.2 18.3 4.5 10.1 4.9 5.5 Comparative Examples 1 21.5 26.5 9.0 18.6 5.0 11.3 6.0 5.8 Comparative Examples 2 20.1 25.0 9.5 22.0 6.0 11.5 6.4 11.2
Claims (1)
1. a heat resistance soft solder lead-base alloy is characterized in that alloying constituent (weight %) is Sn2.0～9.0, Sb0.2～5.0, Cu0.3～2.0, P0.001～0.3, Pb surplus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95105291A CN1039499C (en) | 1995-05-16 | 1995-05-16 | Heat resistance soft solder lead-base alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95105291A CN1039499C (en) | 1995-05-16 | 1995-05-16 | Heat resistance soft solder lead-base alloy |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1120596A true CN1120596A (en) | 1996-04-17 |
| CN1039499C CN1039499C (en) | 1998-08-12 |
Family
ID=5075447
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95105291A Expired - Fee Related CN1039499C (en) | 1995-05-16 | 1995-05-16 | Heat resistance soft solder lead-base alloy |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1039499C (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4608230A (en) * | 1985-03-04 | 1986-08-26 | Fry Metals, Inc. | Pb-Sn-Sb-Ag solder alloy |
| JP2543941B2 (en) * | 1988-03-17 | 1996-10-16 | 大豊工業株式会社 | Solder material |
| JP2807008B2 (en) * | 1989-12-29 | 1998-09-30 | 田中電子工業株式会社 | Pb alloy solder with excellent thermal fatigue properties |
-
1995
- 1995-05-16 CN CN95105291A patent/CN1039499C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1039499C (en) | 1998-08-12 |
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