A method for improving the brazing strength of tungsten-copper parts

A technology for brazing and parts, which is applied in the field of improving the brazing strength of tungsten-copper parts, can solve the problems that the brazing rate is difficult to exceed 80%, the surface quality of materials is poor, and the wettability is not good, so as to avoid welding defects and weld area The effect of increase and high production efficiency

Active Publication Date: 2021-07-30
SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, since tungsten-copper material is a kind of porous structure composite material, which is infiltrated by copper into the tungsten skeleton, the processing technology of this material is easy to bring about the porous characteristics of the material surface, and the tungsten-copper material itself has poor wettability to solder. , and with the increase of tungsten content in tungsten-copper alloy, the wettability is lower, and the surface quality of the material obtained by ordinary metallurgical methods is also worse.
Therefore, during the brazing process of tungsten copper alloy with stainless steel or Kovar alloy, pores are prone to appear, and the brazing rate is difficult to exceed 80%.

Method used

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  • A method for improving the brazing strength of tungsten-copper parts
  • A method for improving the brazing strength of tungsten-copper parts
  • A method for improving the brazing strength of tungsten-copper parts

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Embodiment 1

[0032] A method for improving the brazing strength of tungsten-copper parts, comprising the following steps:

[0033] S1 pressed tungsten billet: press 100g tungsten powder into 10g / cm 3 tungsten billet;

[0034] S2 Forming: Put the pressed tungsten billet into the graphite crucible, put the copper block that needs to be infiltrated on the tungsten billet, the mass of the copper block is 50g, lay a layer of corundum powder in the graphite crucible in advance, and then use 160-220 mesh The corundum powder is buried and compacted, and the thickness of the corundum powder covered on the top and bottom of the tungsten billet is 2cm. The thickness of the corundum powder covered by the tungsten billet from the front and rear edges of the graphite crucible and the left and right edges is the same, and the thickness is 2cm. The pre-sintered part, the corundum powder It is white corundum, and the mass of corundum powder is 8 times that of tungsten billet;

[0035] S3 sintering: put t...

Embodiment 2

[0039] This embodiment is basically the same as Embodiment 1, except that the density of the tungsten billet is different, so the quality of copper that can penetrate into the tungsten billet is different, and the quality of the copper added under the same quality tungsten billet is also different. At the same time, the amount of corundum powder added also changed.

[0040] S1 pressed tungsten billet: press 100g tungsten powder into 13g / cm 3 tungsten billet;

[0041] S2 Forming: Put the pressed tungsten billet into the graphite crucible, put the copper block that needs to be infiltrated on the tungsten billet, the mass of the copper block is 30g, lay a layer of corundum powder in the graphite crucible in advance, and then use 220-260 mesh The corundum powder is buried and compacted, and the thickness of the corundum powder covered on the top and bottom of the tungsten billet is 3cm. The thickness of the corundum powder covering the tungsten billet from the front and rear edge...

Embodiment 3

[0046] This embodiment is basically the same as Embodiment 1, except that the density of the tungsten billet is different, so the quality of copper that can penetrate into the tungsten billet is different, and the quality of the copper added under the same quality tungsten billet is also different. At the same time, the amount of corundum powder added also changed.

[0047] S1 pressed tungsten billet: press 100g tungsten powder into 15g / cm 3 tungsten billet;

[0048] S2 Forming: Put the pressed tungsten billet into the graphite crucible, put the copper block that needs to be infiltrated on the tungsten billet, the mass of the copper block is 15g, lay a layer of corundum powder in the graphite crucible in advance, and then use 260-320 mesh The corundum powder is buried and compacted, and the thickness of the corundum powder covered on the top and bottom of the tungsten billet is 4cm. The thickness of the corundum powder covering the tungsten billet from the front and rear edges ...

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Abstract

The invention discloses a method for improving the brazing strength of tungsten-copper parts, which comprises the following steps: S1 pressing a tungsten billet; S2 forming: putting the pressed tungsten billet into a graphite crucible, and putting copper to be infiltrated on the tungsten billet block, and then use corundum powder to bury and compact it to obtain a pre-sintered part; S3 sintering: put the formed pre-sintered part into an atmosphere-protected molybdenum wire furnace for high-temperature sintering to obtain a tungsten-copper alloy; S4 sandblasting: sinter the sintered After the tungsten-copper alloy is out of the furnace, the surface corundum powder is removed by sandblasting, and a layer of 0.01-0.1mm copper clad layer is naturally formed on the surface of the tungsten-copper alloy; S5 vacuum brazing: the sandblasted tungsten-copper alloy and stainless steel or Kovar alloy are subjected to vacuum Brazing. The method of the present invention adopts an ultra-thin copper-clad layer of 0.01-0.1mm infiltrated on the surface of the tungsten billet, which effectively improves the welding strength between the tungsten-copper alloy and stainless steel or Kovar alloy, improves the brazing rate, and effectively avoids the Welding defects due to non-wetting of tungsten copper material.

Description

technical field [0001] The invention relates to the technical field of tungsten-copper alloy brazing, in particular to a method for improving the brazing strength of tungsten-copper parts. Background technique [0002] Tungsten has a high melting point, low coefficient of linear expansion and high strength, while copper has good electrical and thermal conductivity. Therefore, tungsten-copper composite materials combine many excellent properties of tungsten and copper, so they have good thermal conductivity, arc corrosion resistance, It has the characteristics of anti-welding resistance, high temperature resistance and anti-oxidation, and has been widely used in electric power, electronics, machinery, metallurgy and other industries. [0003] In the 1990s, with the development of large-scale integrated circuits and high-power electronic devices, tungsten copper materials began to be used as electronic packaging and heat sink materials on a large scale as an upgraded product. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00B24C1/08B24C11/00B24C5/02C22C1/04C22C27/04B22F3/10B22F3/26
CPCB22F3/1035B22F3/26B23P15/00B24C1/08B24C5/02B24C11/00C22C1/045C22C27/04
Inventor 周宁周兴杨瑞刘向阳邵红颜刘萍王万刚
Owner SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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