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Medium temperature Zn-Al solder containing Sr, Si, Ti, Ni and P and having high air tightness

A high airtight, zn-al technology, applied in the direction of welding/cutting media/materials, welding media, metal processing equipment, etc., can solve problems such as difficult brazing, high melting point, and inability to meet the mass production requirements of brazed joints

Active Publication Date: 2014-05-14
ZHEJIANG YONGWANG WELDING MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the existing Al-Si based solder (such as 4047, 4043, etc.), although its airtightness meets the requirements, its own melting point is relatively high (the solidus temperature is 577°C, and the liquidus temperature is above 600°C) , which is very close to the melting point of 3-series and 6-series high-strength aluminum alloys, so brazing is very difficult
Although the melting point of Zn-Al solder can be as low as about 400°C (for example, the solidus temperature of 98Zn-2Al is 381°C, and the liquidus temperature is about 410°C), but the airtightness of the Zn-Al solder joint Poor, the "leakage rate" of the laboratory is as high as 16%, which cannot meet the large-scale production requirements of hundreds of thousands of brazed joints per day in heat exchanger production plants

Method used

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  • Medium temperature Zn-Al solder containing Sr, Si, Ti, Ni and P and having high air tightness

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A medium temperature aluminum solder with high air tightness, its chemical composition is: 0.01% Sr, 6.5% Si, 0.001% Ti, 0.01% Ni, 0.0001% P, 65.0% Zn , the balance being Al.

[0024] The "medium temperature aluminum brazing filler metal with high airtightness" obtained by the above composition ratio, combined with commercially available CsF-AlF 3 Flux or KF-AlF 3 Brazing flux has excellent wettability and permeability on the surface of 3-series and 6-series high-strength aluminum alloys, excellent mechanical properties of brazing joints, and excellent air tightness. The brazed joints have passed the hydrostatic test (the water pressure is 18MPa and the pressure is maintained for 30 minutes), and the brazed joints have no leakage. The maximum pressure of the brazed joints in the hydrostatic test can reach 21 MPa (cracking at the aluminum tube).

Embodiment 2

[0026] A medium-temperature aluminum solder with high air tightness, its chemical composition is: 0.1% Sr, 1.5% Si, 0.01% Ti, 0.001% Ni, 0.001% P, 36.0% Zn , the balance being Al.

[0027] The "medium temperature aluminum brazing filler metal with high airtightness" obtained by the above composition ratio, combined with commercially available CsF-AlF 3 Flux or KF-AlF 3 Brazing flux has excellent wettability and permeability on the surface of 3-series and 6-series high-strength aluminum alloys, excellent mechanical properties of brazing joints, and excellent air tightness. The brazed joints have passed the hydrostatic test (the water pressure is 18MPa and the pressure is maintained for 30 minutes), and the brazed joints have no leakage. The maximum pressure of the brazed joints in the hydrostatic test can reach 21 MPa (cracking at the aluminum tube).

Embodiment 3

[0029] A medium temperature aluminum solder with high air tightness, its chemical composition is: 0.05% Sr, 4.5% Si, 0.005% Ti, 0.005% Ni, 0.0005% P, 46.0% Zn , the balance being Al.

[0030] The "medium temperature aluminum brazing filler metal with high airtightness" obtained by the above composition ratio, combined with commercially available CsF-AlF 3 Flux or KF-AlF 3 Brazing flux has excellent wettability and permeability on the surface of 3-series and 6-series high-strength aluminum alloys, excellent mechanical properties of brazing joints, and excellent air tightness. The brazed joints have passed the hydrostatic test (the water pressure is 18MPa and the pressure is maintained for 30 minutes), and the brazed joints have no leakage. The maximum pressure of the brazed joints in the hydrostatic test can reach 21 MPa (cracking at the aluminum tube).

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Abstract

The invention discloses a medium temperature Zn-Al solder containing Sr, Si, Ti, Ni and P and having high air tightness and belongs to a soldering material of metal materials. The solder comprises the following chemical components in percentage by mass: 0.01 to 0.1 percent of Sr, 1.5 to 6.5 percent of Si, 0.001 to 0.01 percent of Ti, 0.001 to 0.01 percent of Ni, 0.0001 to 0.001 percent of P, 36.0 to 65.0 percent of Zn and the balance of Al. The melting point of the solder is at about 480-520 DEG C, the solder has excellent wetting property and permeability on the surface of a high-strength aluminum alloy and a copper-aluminum alloy; a soldering seam has good mechanical property and good air tightness; and the solder is a novel medium temperature aluminum solder which can be applied to soldering of aluminum alloy and aluminum-aluminum pipeline structural parts of multiple brands.

Description

technical field [0001] A medium-temperature Zn-Al solder with high airtightness containing Sr, Si, Ti, Ni, P, combined with commercially available CsF-AlF 3 Flux or KF-AlF 3 Flux, used for brazing of aluminum-aluminum structural parts, belongs to the welding material of metal materials. Background technique [0002] At present, in the home appliance industry, the refrigeration industry, and the hardware industry, due to the huge amount of copper used and the rise in the price of electrolytic copper, the demand for "substituting aluminum for copper" by manufacturers of refrigerators in the home appliance industry, parts and components of the air conditioner industry, and complete machines is increasing. With the intensification of "overcapacity" in the home appliance industry and the escalation of "product price wars", it is becoming more and more urgent. In addition, in many industries, the use of 3-series (such as 3003 aluminum alloy) and 6-series (such as 6061 aluminum a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/28
Inventor 薛鹏薛松柏
Owner ZHEJIANG YONGWANG WELDING MATERIALS CO LTD
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