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Brazing filler metal and process for brazing molybdenum-rhenium alloy

A technology of molybdenum-rhenium alloy and brazing filler metal, which is applied in the direction of manufacturing tools, metal processing, welding equipment, etc., can solve problems such as hindering the welding process, increasing welding cracks, cracks, etc., and achieves suitable melting temperature, refined grains, The effect of expanding the application field

Inactive Publication Date: 2016-10-26
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the welding process, a small amount of oxygen will cause the molybdenum-rhenium alloy to form a hardened phase and segregate at the grain boundary; a large thermal stress will also be generated in the welded joint, resulting in increased welding cracks; at high temperatures, the molybdenum-rhenium alloy The molybdenum element in the molybdenum-rhenium alloy will also oxidize rapidly, forming an oxide film, which hinders the welding process; the defects in the molybdenum-rhenium alloy welded joints are mainly pores and cracks

Method used

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  • Brazing filler metal and process for brazing molybdenum-rhenium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 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 2.55mm×2mm lapped surface.

[0033] The composition and mass percentage ratio of the brazing filler metal are: Mn12%; Co3%; Zr5%, and the balance is Cu. Above-mentioned a kind of preparation method of the brazing filler metal of molybdenum-rhenium alloy, comprising the following steps:

[0034] 1) Weigh high-purity 12gMn particles, 3gCo particles, 5gZr particles and 80gNi particles by mass percentage to obtain a mixture, put into a container with acetone, and carry out ultrasonic cleaning for 20min at a temperature of about 20°C;

[0035] 2) drying the mixture after ultrasonic cleaning in step 1 at a temperature of 30-50° C. to obtain a dry mixture;

[0036] 3) the mixture Cr, Si, Ni and B are prepared by the method of vacuum induction melting to prepare the brazing filler metal master alloy with unifor...

Embodiment 2

[0047] 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 2.55mm×2mm lapped surface.

[0048] The composition and mass percentage ratio of the brazing filler metal are: Mn12%; Co3%; Zr3%, and the balance is Cu. According to the preparation method in Example 1, the thickness of the prepared brazing material was 40 μm.

[0049] The brazing process steps are:

[0050] (1) Preparation stage: Clean the lap surface of the molybdenum-rhenium alloy sample to be brazed, remove impurities, oil stains and oxide film on the surface, use W7 metallographic sandpaper to grind it smoothly, and remove the molybdenum-rhenium alloy and brazing filler metal foil. Put them in acetone together, use ultrasonic cleaning for 15 to 20 minutes, and dry them;

[0051] (2) Assembly stage: place the cleaned solder foil between the lap surfaces of the molybdenum-rhenium alloy, and fit it i...

Embodiment 3

[0055] 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 2.55mm×2mm lapped surface.

[0056] The composition and mass percentage of the solder are Mn10%; Co3%; Zr5%, and the remainder is Cu. According to the preparation method in Example 1, the thickness of the prepared brazing material was 30 μm.

[0057] The brazing process steps are:

[0058] (1) Preparation stage: Clean the lap surface of the molybdenum-rhenium alloy sample to be brazed, remove impurities, oil stains and oxide film on the surface, use W7 metallographic sandpaper to grind it smoothly, and remove the molybdenum-rhenium alloy and brazing filler metal foil. Put them in acetone together, use ultrasonic cleaning for 15 to 20 minutes, and dry them;

[0059] (2) Assembly stage: place the cleaned solder foil between the lap surfaces of the molybdenum-rhenium alloy, and fit it in a special brazing...

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Abstract

The invention discloses brazing filler metal and a process for brazing molybdenum-rhenium alloy. The brazing filler metal comprises, by weight, 7-15% of Mn, 3-6% of Co, 0-8% of Zr and the balance Cu. A method for preparing the brazing filler metal includes proportionally uniformly mixing the Cu, the Mn, the Co and the Zr with one another to obtain mixtures; preparing the brazing filler metal in the shape of a foil strap by the aid of a vacuum induction smelting furnace and a high-vacuum melt-spinning machine. The thickness of the brazing filler metal ranges from 20 micrometers to 50 micrometers. The brazing filler metal and the process have the advantages that the brazing temperature of the brazing filler metal ranges from 1020 DEG C to 1090 DEG C, the brazing filler metal has an appropriate melting temperature, the high-temperature performance of the brazing filler metal can be guaranteed, and the brazing filler metal can be uniformly molten; brazing filler metal foils are favorable for promoting diffusion and interface reaction of alloy elements in brazing connection procedures, the wetting and spreading capacity of the brazing filler metal on the surfaces of the molybdenum-rhenium alloy can be improved, crystalline grains can be refined, residual stress can be reduced, and the mechanical properties of connectors can be improved.

Description

technical field [0001] The invention relates to a brazing material for brazing a molybdenum-rhenium alloy, a preparation method and a brazing process, and belongs to the field of brazing. Background technique [0002] Molybdenum-rhenium alloy has excellent radiation resistance, high tensile strength and good ductility, high temperature performance and electrical conductivity, and is widely used in aerospace, nuclear energy, electronics, electronics, military and other high-tech fields, such as structural The wrapping material is used in the thermal ion exchangers of space nuclear reactors, and made into foils and ultra-fine wires as elastic elements used in high-temperature equipment such as heaters and thermocouples (good effect and long service life). Molybdenum-rhenium alloy has good wear resistance and strong arc ablation resistance, so it can be widely used in electronic components. [0003] Molybdenum-rhenium alloy is a high temperature refractory metal alloy. Due to ...

Claims

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Application Information

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IPC IPC(8): B23K35/30B23K35/40B23K1/19B23K1/20B23K1/008C22C9/05B23K101/18
CPCB23K35/302B23K1/0008B23K1/008B23K1/19B23K1/206B23K35/0233B23K35/40C22C9/05
Inventor 夏春智吴磊许祥平邹家生
Owner JIANGSU UNIV OF SCI & TECH
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