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Low-Ti high-strength silver-based middle-temperature active brazing filler metal and preparation method thereof

An active solder, high-strength technology, used in manufacturing tools, welding equipment, metal processing equipment, etc., can solve the problems of increased Ti element content, increased melting point of alloys, and inability to process AgCuTi alloys, achieving fast cooling speed , the effect of uniform composition

Active Publication Date: 2019-04-09
BEIJING INST OF NONFERROUS METALS & RARE EARTH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The study found that the Ti content in the AgCuTi active solder is greater than 4.0% (mass percentage) to have better welding performance for ceramics. However, Ti element is prone to segregation in the alloy, and it is difficult to add to the alloy, resulting in high Ti content. The AgCuTi alloy cannot be processed and prepared, and the content of Ti element in the alloy increases, which will also cause the melting point of the alloy to increase

Method used

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  • Low-Ti high-strength silver-based middle-temperature active brazing filler metal and preparation method thereof
  • Low-Ti high-strength silver-based middle-temperature active brazing filler metal and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] (1) According to the mass percentage: 23% Cu, 20% Sn, 3% Pd, 3% Ti, the balance is Ag for vacuum casting, the purity of each metal is 99.99wt%, and the vacuum degree is greater than 1 ×10 -3 Pa, the melting temperature is 1300°C, hold for 20 minutes.

[0034] (2) Subsequently, high-pressure gas atomization and deposition treatment are carried out, the atomization temperature is 1300°C, and the atomization gas flow rate is 35m 3 / min, the melt flow rate is 9.0kg / min, the atomizing gas pressure is 0.8MPa, and the deposition distance is 700mm to obtain alloy blanks.

[0035] (3) After spray deposition, the billet is subjected to hot extrusion treatment, the extrusion temperature is 400°C, the heat preservation is 60min, the extrusion ratio is 30:1, and the breakthrough pressure is 200kg / cm 2 , holding force 170kg / cm 2 , The extrusion speed is 0.06m / min, and the alloy is extruded into a strip with a thickness of 2mm.

[0036] (4) Carry out cold rolling processing+vacuum...

Embodiment 2

[0040] The process condition of this embodiment is the same as that of embodiment 1, only the mass percentage of Ti in the alloy is changed to 2.0%, the mass percentage of Sn is 25.0%, the mass percentage of Pd is 5.0%, the mass percentage of Cu is 25.0%, Ag for the margin. The melting temperature of the prepared AgCuSnPdTi alloy sheet is 539 °C, and the Si 3 N 4 Spreading experiments on ceramics measured a wetting angle of 15° and soldered Si at 590°C 3 N 4 Ceramic, brazing filler metal has good wettability, uniform welding, no cracking phenomenon, and the tensile strength at room temperature is 260MPa.

Embodiment 3

[0042] (1) According to the mass percentage: 25% Cu, 20% Sn, 3% Pd, 3% Ti, the balance is Ag for vacuum casting, the purity of each metal is 99.99wt%, and the vacuum degree is greater than 1 ×10 -3 Pa, the melting temperature is 1200°C, hold for 20min.

[0043] (2) Subsequently, high-pressure gas atomization and deposition treatment are carried out, the atomization temperature is 1200°C, and the atomization gas flow rate is 25m 3 / min, the melt flow rate is 8.0kg / min, the atomizing gas pressure is 0.7MPa, the deposition distance is 600mm, and the alloy blank is obtained.

[0044] (3) After spray deposition, the billet is subjected to hot extrusion treatment, the extrusion temperature is 400°C, the heat preservation is 60min, the extrusion ratio is 30:1, and the breakthrough pressure is 200kg / cm 2 , holding force 170kg / cm 2 , The extrusion speed is 0.06m / min, and the alloy is extruded into a strip with a thickness of 2mm.

[0045] (4) The extruded AgCuSnPdTi alloy blank is ...

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Abstract

The invention relates to low-Ti high-strength silver-based middle-temperature active brazing filler metal and a preparation method thereof. The brazing filler metal is prepared from 20 to 25 percent by weight of Cu, 15 to 25 percent by weight of Sn, 1 to 5 percent by weight of Pd, 1.0 to 3.0 percent by weight of Ti, and the balance Ag. The preparation method comprises the steps of adopting variousmetal for smelting according to the alloy proportion, then atomizing through high-pressure gas and carrying out deposition modeling, carrying out hot extrusion treatment on a modeled blank so as to enable an alloy to be densified, then rolling the densified blank, and finally obtaining an AgCuSnPdTi alloy sheet. The alloy brazing filler metal prepared through the method is uniform in compositionsand segregation-free, and can be processed into the sheet, and the welding temperature is lowered by about 200 DEG C compared with conventional AgCuTi active brazing filler metal, so that the residual heat stress of an Si3N4 ceramic welded joint is reduced, and the welding strength and the reliability of Si3N4 ceramics are improved.

Description

technical field [0001] The invention relates to a AgCuSnPdTi medium-temperature active solder and a preparation method thereof, which are mainly used in Si in the electronic information industry. 3 N 4 A medium-temperature active connection of ceramics belongs to the field of welding materials. Background technique [0002] Si 3 N 4 Ceramics have the characteristics of high strength, high hardness, wear resistance, and excellent high-temperature mechanical properties and thermal stability, and are widely used in aerospace, energy, electronics, and automobiles. However, Si 3 N 4 Ceramics are brittle, difficult to deform and difficult to cut. In addition, the inherent brittleness of ceramic materials can easily lead to extremely small critical cracks, making the processing of ceramic materials more difficult and difficult to manufacture components with complex shapes, resulting in Si 3 N 4 The application of ceramics is limited. [0003] Active metal brazing technolog...

Claims

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Application Information

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IPC IPC(8): B23K35/30B23K35/40B23K35/14
CPCB23K35/0227B23K35/3006B23K35/40
Inventor 蔡正旭焦磊王炜史秀梅金凯付晓玄王峰
Owner BEIJING INST OF NONFERROUS METALS & RARE EARTH
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