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A kind of molybdenum/steel joint and preparation method thereof

A technology of steel blocks and connecting ends, which is applied in the direction of welding equipment, manufacturing tools, welding media, etc., can solve the problems of low welding efficiency, large thermal influence of weldments, thermal cracks, etc., and achieve high connection strength, uniform and dense connection layer, and improved The effect of joint performance

Active Publication Date: 2020-11-27
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The commonly used methods for connecting molybdenum / steel mainly include arc welding and TIG welding, etc. The main welding defects in arc welding are pores and thermal cracks, etc. The large heat output of the TIG welding method leads to a large heat-affected zone of the weldment, which makes the welding efficiency relatively low , and there are still many pores

Method used

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  • A kind of molybdenum/steel joint and preparation method thereof
  • A kind of molybdenum/steel joint and preparation method thereof
  • A kind of molybdenum/steel joint and preparation method thereof

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Effect test

Embodiment 1

[0030] To prepare a molybdenum / steel joint with a "sandwich" structure and W foil added to the connecting layer, the specific steps are as follows:

[0031] 1. Weigh 0.2g of Ni76CrP powder and add glycerol solvent to blend into a viscous paste to obtain Ni76CrP paste solder.

[0032] 2. Grind the W foil with a thickness of 50μm with sandpaper first to remove the oxides on both sides of the W foil, and then put it in alcohol for ultrasonic cleaning for 30 minutes.

[0033] 3. Grind the end faces of the molybdenum block and the steel block to be connected with metallographic sandpaper step by step, then put it in an ultrasonic cleaning machine for 30 minutes, and then dry it with a hair dryer for use.

[0034] 4. First coat the Ni76CrP paste solder obtained in step 1 on the steel block, then place W foil, and then coat the Ni76CrP paste solder obtained in step 1 on the molybdenum block, cover it on the W foil, and finally apply 10kPa Put the whole into a molybdenum wire vacuum furnace, ...

Embodiment 2

[0038] To prepare a tungsten / steel joint with a "sandwich" structure and Ni foil added to the connecting layer, the specific steps are as follows:

[0039] 1. Weigh 0.2g of Ni76CrP powder and add glycerol solvent to blend into a viscous paste to obtain Ni76CrP paste solder.

[0040] 2. Grind the Ni foil with a thickness of 50μm with sandpaper to remove the oxides on both sides of the Ni foil, and then put it in alcohol for ultrasonic cleaning for 30 minutes.

[0041] 3. Grind the end faces of the molybdenum block and the steel block to be connected with metallographic sandpaper step by step, then put it in an ultrasonic cleaning machine for 30 minutes, and then dry it with a hair dryer for use.

[0042] 4. First coat the Ni76CrP paste solder obtained in step 1 on the steel block, then place the Ni foil, and then coat the Ni76CrP paste solder obtained in step 1 on the molybdenum block, cover it on the Ni foil, and finally apply 10kPa Put the whole into a molybdenum wire vacuum furnace,...

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Abstract

The invention discloses a molybdenum / steel connector and a preparation method thereof. A connecting layer of the molybdenum / steel connector has a sandwich type three-layer structure and comprises twoNi76CrP solder layers for being connected with molybdenum and steel correspondingly and a metal foil layer located between the two Ni76CrP solder layers. The preparation method comprises the followingsteps that 1, a proper amount of Ni76CrP welding powder is taken, glycerol is added to be blended, and Ni76CrP paste solder is obtained; and 2, the to-be-connected end faces of a steel block and a molybdenum block are coated with each coated with a layer of Ni76CrP paste solder obtained in step 1, then metal foil is placed between the two Ni76CrP paste solder layers, the steel block and the molybdenum block are closed, finally the load of 10 kPa is applied, overall brazing is carried out, brazing is carried out under the vacuum condition, the temperature is raised to 1000 DEG C to 1100 DEG C,heat preservation is carried out for 10 min, and the molybdenum / steel connector is obtained. The preparation method is simple and easy to operate, and raw material cost is low. The prepared molybdenum / steel connector is even and dense in layer, good in interface bonding, free of cracks and pores and other defects and high in connecting strength.

Description

Technical field [0001] The invention belongs to the technical field of connection of dissimilar materials, relates to the connection of molybdenum / steel, and specifically relates to a molybdenum / steel joint and a preparation method thereof. Background technique [0002] Refractory metal molybdenum has good high temperature performance, high melting point, low thermal expansion coefficient, excellent thermal and electrical conductivity, strong wear resistance and corrosion resistance, thermal shock resistance and good mechanical properties, making it suitable for metallurgy, chemical and mechanical properties. Metal processing, aviation, nuclear industry, electronics industry and military industry have been widely used. In practical engineering applications, in order to meet the requirements of various special environments such as heat resistance and corrosion resistance, a single material is often difficult to achieve, and different materials need to be connected together for use...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K33/00B23K1/00B23K1/20B23K35/30
CPCB23K1/00B23K1/203B23K1/206B23K33/00B23K35/304
Inventor 毛样武闵梅马昕剑王戈明邓泉荣王升高
Owner WUHAN INSTITUTE OF TECHNOLOGY