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Low-melting-point and high-strength aluminum-based brazing filler metal and preparation method thereof

A high-strength, low-melting-point technology, applied in the direction of manufacturing tools, welding equipment, metal processing equipment, etc., can solve the problems that limit the promotion and application of high-strength aluminum alloy brazing structural parts, collapse of aluminum alloy brazing structural parts, and insufficient joint strength. High-level problems, to achieve the effect of improving structural performance and process performance, excellent wettability and spreadability, and improving joint filling ability

Inactive Publication Date: 2012-12-19
GUILIN QINGTONG NON FERROUS METAL ARTS & CRAFTS MATERIAL DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Coupled with the common "metallurgical genetic phenomenon" of metal remelting, the strength of the joint obtained by brazing the base metal with brittle solder must not be high, and the tendency of brittle fracture is extremely high, and the joint often fails suddenly under the service conditions of the brazed structural parts , resulting in the sudden collapse of the entire aluminum alloy brazing structure, resulting in equipment accidents
[0004] At present, in the field of aluminum-based brazing filler metal technology, the technical problem that aluminum-based brazing filler metal has low melting point, high strength and high toughness at the same time has not been solved. Popularization and Application of High Strength Aluminum Alloy Brazing Structural Parts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. The composition of aluminum-based solder:

[0030] In terms of mass percentage, the aluminum-based solder of the present invention is composed of Si: 10%, Cu: 10%, Ni: 2%, Sr: 0.05%, Ti: 0.05%, Y: 0.05% and the rest of Al.

[0031] 2. Preparation method:

[0032] 1) Weigh each component according to the composition of the fiber material, among which Al is added in the form of pure metal, and the elements Si, Cu, Ni, Sr, Ti and Y are respectively expressed as Al-20Si, Al-50Cu and Al-10Ni, Al-10Sr, Al-5Ti and Al-10Y master alloys are added;

[0033] 2) Melting: put aluminum into graphite crucible melting furnace, add flux for aluminum (mixed dry powder of KCl and NaCl, wherein KCl:NaCl=1:1, the amount added is 1% of the total weight of pure aluminum), heat to 800°C and melt Finally, remove slag, then add Al-Si, Al-Cu and Al-Ni intermediate alloys in proportion, then add aluminum flux (mixed dry powder of KCl and NaCl, wherein KCl:NaCl=1:1, and the addition amount is ch...

Embodiment 2

[0038] 1. The composition of aluminum-based solder:

[0039] In terms of mass percentage, the aluminum-based solder of the present invention is composed of Si: 12%, Cu: 12%, Ni: 2.3%, Sr: 0.06%, Ti: 0.08%, Y: 0.09%, and the balance of Al.

[0040] Two: Preparation method:

[0041] It is the same as Example 1, except that the first refining is refining at 800° C. for 10 minutes, and the second refining is refining at 780° C. for 6 minutes.

[0042] The above-mentioned aluminum-based brazing filler metal wire made is detected, and the performance indicators obtained are:

[0043] The liquidus temperature is 548.3°C, the solidus temperature is 502.2°C; the tensile strength of the solder itself is σb=106.4MPa; when the base metal is 6063 and the flux is QJ201, the brazing temperature is 550-580°C, and the tensile strength of the weld is The strength is 85Mpa; when the base metal is 6063, the flux is QJ201, and the temperature is 600°C, the spreading area is 1.96cm 2 .

Embodiment 3

[0045] 1. The composition of aluminum-based solder:

[0046] In terms of mass percentage, the aluminum-based solder of the present invention is composed of Si: 8%, Cu: 8%, Ni: 1.5%, Sr: 0.03%, Ti: 0.02%, Y: 0.02%, and the balance of Al.

[0047] Two: Preparation method:

[0048] It is the same as Example 1, except that the first refining is refining at 760° C. for 15 minutes, and the second refining is refining at 750° C. for 5 minutes.

[0049] The above-mentioned aluminum-based brazing filler metal wire made is tested, and the performance indicators obtained are:

[0050] The liquidus temperature is 579.5°C, the solidus temperature is 527.6°C; the tensile strength of the solder itself is σb=1116MPa; when the base metal is 6063 and the flux is QJ201, the brazing temperature is 550-580°C, and the tensile strength of the weld is is 79Mpa; when the base metal is 6063, the flux is QJ201, and the temperature is 600°C, the spreading area is 1.23cm 2 .

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Abstract

The invention discloses a low-melting-point and high-strength aluminum-based brazing filler metal and a preparation method thereof. The brazing filler metal consists of the following components in percentage by mass: 6 to 13 percent of Si, 6 to 13 percent of Cu, 1 to 3 percent of Ni, 0.01 to 0.1 percent of Sr, 0.01 to 0.2 percent of Ti, 0.01 to 0.2 percent of Y and the balance of Al. The preparation method comprises the following steps of: weighing each component; adding the components into a graphite crucible melting furnace according to a certain sequence; melting and then refining twice, wherein argon gas and hexachloroethane are used as refining agents during the refining; introducing the hexachloroethane from bottom of solution by the argon gas, wherein the introduction pressure of the argon gas is 5 to 7KPa; and continuously casting solution which is subjected to the second refining process under the protection of nitrogen gas as required or performing gas atomization to form the aluminum-based brazing filler metal in different forms. The aluminum-based brazing filler metal prepared by the method has the superior characteristics of low melting point, high strength, toughness, wettability and spreadability and the like.

Description

technical field [0001] The invention relates to an aluminum alloy brazing material and a preparation method thereof, in particular to a low melting point, high-strength aluminum-based brazing material and a preparation method thereof. Background technique [0002] Since the beginning of the 21st century, with the rapid development of the manufacturing industry of railway passenger cars, road passenger cars, automobiles and other mass transportation, especially the rapid development of high-speed railway passenger cars, aerospace industry, and shipbuilding industry, high-strength aluminum alloy brazing structural parts It is widely used, and therefore puts forward higher requirements for the brazing technology of high-strength aluminum alloy structural parts. [0003] The melting point of the aluminum-based solder used for brazing connection of high-strength aluminum alloy structural parts of contemporary transportation equipment must be lower than the melting point of the sp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/28B23K35/40
Inventor 阳家盛
Owner GUILIN QINGTONG NON FERROUS METAL ARTS & CRAFTS MATERIAL DEV CO LTD
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