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Al18B4O33 whisker-reinforced silver-copper composite brazing filler metal and preparation method thereof

A composite solder and whisker technology, applied in welding equipment, manufacturing tools, metal processing equipment, etc., to achieve the effects of overcoming dependence, expanding the scope of application, and fully absorbing energy

Active Publication Date: 2018-06-05
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems existing in the existing composite solder, the technical problem to be solved by the present invention is to provide an Al 18 B 4 o 33 Whisker-reinforced silver-copper composite solder, which is used to distribute the one-dimensional single crystal of the reinforcing phase evenly in the brazing joint, and the number, distribution, size and applicable conditions of the reinforcing phase are not limited, which can improve the strength of the brazing joint

Method used

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  • Al18B4O33 whisker-reinforced silver-copper composite brazing filler metal and preparation method thereof
  • Al18B4O33 whisker-reinforced silver-copper composite brazing filler metal and preparation method thereof
  • Al18B4O33 whisker-reinforced silver-copper composite brazing filler metal and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] This embodiment weighs 65% of Ag powder, 25% of Cu powder and 10% of Al by mass percentage. 18 B 4 o 33 Whiskers, mixed to obtain raw solder powder;

[0024] Place the above-mentioned original solder powder and balls in a planetary ball mill jar, fill the ball mill jar with argon gas after vacuuming, and ball mill for 4 hours at a speed of 120r / min to obtain Al 18 B 4 o 33 Whisker-reinforced silver-copper composite solder; the ball-to-material ratio is 9:1, and the filler ratio is 45%.

[0025] The ball-to-material ratio refers to the ratio of the mass of ceramic balls used in ball milling to the mass of the brazing filler metal; the filler ratio refers to the ratio of the total volume of balls + brazing filler metal powder to the volume of the ball milling tank.

[0026] Test 1:

[0027] For the Al prepared above 18 B 4 o 33 The microscopic morphology of whisker-reinforced silver-copper composite solder was observed by scanning electron microscope, from figur...

Embodiment 2

[0038] The present embodiment weighs 60% Ag powder, 30% Cu powder and 10% Al by mass percentage. 18 B 4 o 33 Whiskers, mixed to obtain raw solder powder;

[0039] Place the above-mentioned original solder powder and balls in a planetary ball milling jar, fill the ball milling jar with argon gas after vacuuming, and ball mill for 2 hours at a speed of 100r / min to obtain Al 18 B 4 o 33 Whisker-reinforced silver-copper composite solder; the ball-to-material ratio is 6:1, and the filler ratio is 40%.

[0040] Test by the test 3 of embodiment 1, the Al of the present embodiment 18 B 4 o 33 Whisker-reinforced silver-copper composite solder for air brazing of Al 2 o 3 The average shear strength of ceramic brazed joints is 45 MPa.

Embodiment 3

[0042] The present embodiment weighs 70% Ag powder, 20% Cu powder and 10% Al by mass percentage. 18 B 4 o 33 Whiskers, mixed to obtain raw solder powder;

[0043] Place the above-mentioned original solder powder and balls in a planetary ball mill jar, fill the ball mill jar with argon gas after vacuuming, and ball mill for 8 hours at a speed of 150r / min to obtain Al 18 B 4 o 33 Whisker-reinforced silver-copper composite solder; the ball-to-material ratio is 12:1, and the filler ratio is 50%.

[0044] Test by the test 3 of embodiment 1, the Al of the present embodiment 18 B 4 o 33 Whisker-reinforced silver-copper composite solder for air brazing of Al 2 o 3 The average shear strength of ceramic brazed joints is 58 MPa.

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Abstract

The invention discloses an Al18B4O33 whisker-reinforced silver-copper composite brazing material and a preparation method thereof. The composite brazing filler metal is composed of, by mass, 60%-70% of Ag powder, 20%-30% of Cu powder and 5%-15% of Al18B4O33 whiskers. The preparation method comprises the following steps of 1, weighing 60%-70% of the Ag powder, 20% to 30% of the Cu powder and 5% 15%of the Al18B4O33 whiskers according to the mass percentage, and mixing to obtain original brazing filler metal powder; placing the original brazing filler metal powder and a grinding ball obtained inthe step 1 in a planetary ball mill tank, filling the ball mill tank with argon gas after vacuuming, and conducting ball-milling for 2-8 hours at a rotation speed of 100-150 r / min to obtain the Al18B4O33 whisker-reinforced silver-copper composite brazing filler metal. The method increases the strength of welding.

Description

technical field [0001] The invention belongs to the field of welding technology, and relates to whisker-reinforced silver-copper composite solder and a preparation method, which are used for ceramic / ceramic or ceramic / metal brazing. Background technique [0002] Ceramic materials are widely used in aerospace, electronics, chemical, nuclear and other fields due to their advantages of high temperature resistance, corrosion resistance, wear resistance, low density and high strength. However, the brittleness of the ceramic material itself makes it difficult to make large and complex components, so it needs to be connected by itself or with metals by welding to make components that meet the use requirements. Among the many joining methods, brazing is the simplest and most practical method for ceramic joining. However, the difference in physical properties between ceramic and metal base material and between ceramic base material and metal brazing seam is large, and it is easy to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K35/40
CPCB23K35/3006B23K35/40
Inventor 王义峰黄俊锋曾俊逸张建军刘亚磊
Owner CHONGQING UNIV
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