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High temperature Fe-based solder for brazing 50Mo-50Re alloy and preparation method thereof, and brazing process

A 50mo-50re, brazing technology, used in manufacturing tools, welding equipment, metal processing equipment, etc., can solve the problems of low joint performance, hard particle aggregation, uneven element diffusion, etc., to facilitate foil welding, Good surface wetting and spreading, the effect of promoting element diffusion

Active Publication Date: 2017-01-04
HUAWEI TEHCHNOLOGIES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Application number 201210410262.6 (iron-cobalt-nickel-chromium-based brazing filler metal for TiAl and nickel-based superalloy brazing) introduces an iron-cobalt-nickel-chromium-based brazing filler metal for TiAl and nickel-based superalloy brazing, alloying elements The content is obviously higher than that of the solder mentioned in this application. This kind of solder does not contain Nb elements. In the process of brazing 50Mo-50Re alloys, uneven diffusion of elements and aggregation of some hard particles are prone to occur. After welding, 50Mo- The joint strength of 50Re alloy can only reach about 70-80MPa, and the joint performance is low

Method used

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  • High temperature Fe-based solder for brazing 50Mo-50Re alloy and preparation method thereof, and brazing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Molybdenum-rhenium alloy (50% Mo, 50% Re) lap joint vacuum brazing: the size of the molybdenum-rhenium alloy sample is 50mm×2.55mm×0.06mm, and the surface to be brazed is 5mm×2mm.

[0034] The composition and mass percentage ratio of the solder are: Co8%; Ni9%; Si8%; B2.5%; Nb4%, and the balance is Fe.

[0035] The above-mentioned preparation method of a brazing filler metal for molybdenum-rhenium alloy comprises the following steps:

[0036]1) Weigh high-purity 68.5g Fe granules, 8gSi granules, 2.5gB granules, 8gCo granules, 9gNi granules and 4gNb granules by mass percentage to prepare a mixture, put them into a container with acetone, and carry out at a temperature of about 20°C Ultrasonic cleaning for 20 minutes;

[0037] 2) drying the mixture after ultrasonic cleaning in step 1 at a temperature of 30-50° C. to obtain a dried mixture;

[0038] 3) The mixture Fe, Si and B are prepared by vacuum induction smelting to prepare a solder master alloy with uniform composi...

Embodiment 2

[0049] Molybdenum-rhenium alloy (50% Mo, 50% Re) lap joint vacuum brazing: the size of the molybdenum-rhenium alloy sample is 50mm×5mm×0.06mm, and the surface to be brazed is 5mm×1mm lapping surface.

[0050] The composition and mass percentage ratio of the solder are: Co9%; Ni9%; Si5.5%; B2.5%; Nb3% and the balance is Fe. According to the preparation method in Example 1, the thickness of the brazing filler metal prepared was 40 μm.

[0051] The brazing process steps are:

[0052] (1) Preparation stage: clean the overlapping surface of the molybdenum-rhenium alloy sample to be brazed, remove the surface impurities, oil stains and oxide film, use W7 metallographic sandpaper to grind smooth, and put the molybdenum-rhenium alloy and brazing foil Put them together in acetone, use ultrasonic cleaning for 15-20 minutes, and dry them;

[0053] (2) Assembly stage: place the cleaned solder foil between the overlapping surfaces of the molybdenum-rhenium alloy, and fit it tightly in th...

Embodiment 3

[0057] Molybdenum-rhenium alloy (50% Mo, 50% Re) lap joint vacuum brazing: the size of the molybdenum-rhenium alloy sample is 30mm×5mm×0.2mm, and the surface to be brazed is 5mm×2mm lapping surface.

[0058] The composition and mass percentage ratio of the solder are: Co8%; Ni9%; Si5.5%; B2.5%; Nb4.5%, and the balance is Fe. The thickness of the solder is 30 μm.

[0059] The brazing process steps are:

[0060] (1) Preparation stage: clean the overlapping surface of the molybdenum-rhenium alloy sample to be brazed, remove the surface impurities, oil stains and oxide film, use W7 metallographic sandpaper to grind smooth, and put the molybdenum-rhenium alloy and brazing foil Put them together in acetone, use ultrasonic cleaning for 15-20 minutes, and dry them;

[0061] (2) Assembly stage: place the cleaned solder foil between the molybdenum-rhenium alloy overlapping surfaces, and fit it tightly in a special brazing fixture to ensure the accuracy of the connection, and place a r...

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Abstract

The invention discloses a high temperature Fe-based solder for brazing 50Mo-50Re alloy and preparation method thereof, and brazing process. The solder includes the components with following weight ratios: Co 4wt%-9wt%, Ni 3wt%-12wt%, Si 3wt%-8wt%, B 0wt%-3wt%, Nb 3wt%-5wt%, and the balance Fe. The preparation method for the high temperature Fe-based solder comprises the following steps: mixing Fe particles, Si particles, B particles, Co particles, Ni particles and Nb particles evenly in proportion, making the solder into foil strip shape with a thickness ranging from 20-50Mum by using vacuum induction melting furnace and high vacuum spinning machine. The temperature for brazing the solder ranges from 1060-1160 DEG C, and the melting temperature of the solder keeps extremely high to ensure the high temperature performance of a weld. The solder is molten uniformly. The use of solder foil is conducive to promoting the diffusion of alloy elements in soldered connection process, and the solder foil is conducive to promoting element diffusion in soldered connection process. Solid solution can be generated by Fe element and Mo element; Co element and Nb element can promote the diffusion of Mo element and Re element in a brazing seam, so as to form a wide diffusion layer. The performance of the brazing seam is improved.

Description

technical field [0001] The invention relates to a high-temperature Fe-based solder used for brazing 50Mo-50Re alloys, a preparation method and a brazing process, and belongs to the field of brazing. Background technique [0002] Since it was discovered in 1955 that Mo50Re alloy has better plasticity and strength than molybdenum, many researchers have carried out detailed and in-depth research on the structure, properties and processing technology of molybdenum-rhenium alloy. In the early research, Russian Savitsky made a significant contribution and provided his own research results in his monograph. Davidson [2] and others systematically studied the elastic constants of molybdenum-rhenium alloys. In recent years, Garin et al. prepared molybdenum-rhenium alloys by powder metallurgy method of medium temperature sintering, and then Mannheim et al. studied its hardening phenomenon. Todd et al studied the mechanical properties and microstructure of various molybdenum-rhenium a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K35/40
CPCB23K35/3053B23K35/40
Inventor 夏春智吴磊许祥平邹家生
Owner HUAWEI TEHCHNOLOGIES CO LTD
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