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Brazing filler metal for brazing W-Cu composite and Fe-based alloy, method and brazing technique

A technology of composite materials and solders, applied in welding/cutting media/materials, metal processing equipment, welding/welding/cutting items, etc., can solve the connection technology between W-Cu composite materials and Fe-based powder alloys that have not been seen yet problem, to achieve the effect of repeatable brazing process, simple brazing process, and improved mechanical properties

Active Publication Date: 2015-11-25
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are no relevant reports on the connection technology of W-Cu composite materials and Fe-based powder alloys

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] W-Cu composite material (W accounts for 55% by weight, Cu accounts for 45% by weight) and Fe-based powder alloys (Co10.5%, C2.3%, Cr4.0%, Mo7.0%, W6.5%, V6 .5%, the balance is Fe) Butt joint vacuum brazing: W-Cu composite material and Fe-based powder alloy sample size are both 20mm×20mm×6mm, and the brazing surface is 20mm×6mm.

[0031] The composition and mass percentage ratio of the solder are: Mn7.0%, Co4.5%, Ni0.5%, Zr4.5%, Ti1.5%, and the balance is Cu. The thickness of the solder is 100 μm.

[0032] The method for preparing the solder for brazing W-Cu composite material and Fe-based powder alloy includes the following steps:

[0033] 1) Weigh high-purity 70gMn flakes, 45gCo particles, 5gNi particles, 45gAg particles, 15Ti particles and 820gCu particles according to mass percentage to prepare a mixture, put them into a container with acetone, and conduct ultrasonic cleaning at a temperature of about 20°C 20min;

[0034] 2) Dry the mixture after ultrasonic cleaning in ste...

Embodiment 2

[0046] W-Cu composite material (W accounts for 55% by weight, Cu accounts for 45% by weight) and Fe-based powder alloys (Co10.5%, C2.3%, Cr4.0%, Mo7.0%, W6.5%, V6 .5%, the balance is Fe) Butt joint vacuum brazing: W-Cu composite material and Fe-based powder alloy sample size are both 20mm×20mm×6mm, and the brazing surface is 20mm×6mm.

[0047] The composition and mass percentage ratio of the solder are: Mn8.0%, Co4.0%, Ni1.0%, Zr3.5%, Ti2.0%, and the balance is Cu. According to the preparation method in Example 1, the thickness of the prepared solder is 80 μm.

[0048] The brazing process steps are:

[0049] (1) Preparation stage: clean the end surface of the W-Cu composite material and Fe-based powder alloy sample to be brazed to remove the impurities, oil and oxide film on the surface, and use W28~W7 metallographic sandpaper to grind and smooth the W -Cu composite material, Fe-based powder alloy and solder foil are put together in acetone, ultrasonically cleaned for 20 minutes, a...

Embodiment 3

[0054] W-Cu composite material (W55Cu45, wt%) and Fe-based powder alloy (Co10.5%, C2.3%, Cr4.0%, Mo7.0%, W6.5%, V6.5%, the balance is Fe) Butt joint vacuum brazing: W-Cu composite material and Fe-based powder alloy sample size are both 20mm×20mm×6mm, and the brazing surface is 20mm×6mm.

[0055] The composition and mass percentage ratio of the solder: the composition and mass percentage ratio of the solder are: Mn9.0%, Co3.5%, Ni1.5%, Zr2.5%, Ti2.5%, and the balance is Cu. According to the preparation method in Example 1, the thickness of the prepared solder is 50 μm.

[0056] The brazing process steps are:

[0057] (1) Preparation stage: clean the end surface of the W-Cu composite material and Fe-based powder alloy sample to be brazed to remove the impurities, oil and oxide film on the surface, and use W28~W7 metallographic sandpaper to grind and smooth the W -Cu composite material, Fe-based powder alloy and solder foil are put together in acetone, ultrasonically cleaned for 20 m...

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Abstract

The invention discloses brazing filler metal for brazing a W-Cu composite and Fe-based alloy, a method and a brazing technique. The brazing filler metal is in a foil piece strip shape. The thickness of the brazing filler metal ranges from 50 micrometers to 100 micrometers. The brazing filler metal comprises, by weight, 6.0%-9.0% of Mn, 3.5%-5% of Co, 0.3%-1.7% of Ni, 2.0%-5.0% of Zr, 1.2%-2.8% of Ti, and the balance Cu. The brazing temperature of the brazing filler metal ranges from 1000 DEG C to 1050 DEG C, the melting temperature of the brazing filler metal is moderate, and the brazing filler metal is uniformly melted; diffusion and the interface reaction of alloy elements in the brazed connection process can be promoted through a brazing filler metal foil piece, and the wetting and spreading capacity of the brazing filler metal on the surfaces of the W-Cu composite and the Fe-based sintered alloy is improved; crystal particles are refined, residual stress is reduced, and the mechanical performance of joints is improved; the brazing technique for connecting the W-Cu composite and the Fe-based sintered alloy through the brazing filler metal is stable and reliable, vacuum brazed connection is used, a component is in a vacuum state in the heating process, the whole component does not deform, the defects such as microscopic cracks, air holes and inclusions are avoided, and the wetting and spreading capacity of the surface of the brazing filler metal is good.

Description

Technical field [0001] The invention relates to a brazing filler metal for brazing W-Cu composite materials and Fe-based alloys, a method and a brazing process, and belongs to the technical field of heterogeneous material welding. Background technique [0002] W-Cu composite material combines many advantages of W and Cu, with high strength, hardness, good electrical and thermal conductivity, low thermal expansion coefficient, good arc corrosion resistance, high temperature oxidation resistance, welding resistance and dimensional stability Sex and other advantages. It is widely used in the fields of aerospace, automobile industry, machinery, energy, electronics and military defense. W-Cu composite materials are not only used as high temperature resistant connectors, heat sink materials, heat sink materials and contact materials, but also used as high temperature components such as rocket and missile tail nozzles, nozzles, gas rudders and other high temperature components. Fe-bas...

Claims

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Application Information

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IPC IPC(8): B23K35/14B23K35/40B23K1/19B23K1/20B23K1/008B23K103/16
CPCB23K1/008B23K1/19B23K1/206B23K35/0233B23K35/302B23K35/40B23K2103/16
Inventor 夏春智许祥平杨俊邹家生
Owner JIANGSU UNIV OF SCI & TECH
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