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SPS diffusion welding method for molybdenum alloy and tungsten alloy

A technology of diffusion welding and tungsten alloy, which is applied in the direction of welding equipment, welding/welding/cutting items, non-electric welding equipment, etc., which can solve the problem of high requirements on the surface cleanliness of metal parts and equipment vacuum, difficult high bonding strength joints, mechanical Performance degradation and other problems, to achieve the effect of fast and efficient connection, inhibit grain growth, and short holding time

Inactive Publication Date: 2017-09-19
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods have many disadvantages: it is difficult to make joints with high bonding strength; the cleanliness of the metal surface and the vacuum degree of the equipment are very high; the solid phase diffusion connection and the instantaneous liquid phase connection require high temperature and long holding time, resulting in The connection between the two is time-consuming and energy-consuming; fusion welding is prone to cracks; although the connection temperature of brazing is low, because the melting point of the solder is generally low, it is difficult to make joints that can be used at high temperatures by brazing
On the other hand, the mechanical properties of molybdenum alloy and tungsten alloy will be greatly reduced after high temperature recrystallization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The SPS diffusion welding of molybdenum alloy and tungsten alloy of the present embodiment is carried out as follows:

[0042] step 1,

[0043] Use #400, #800, #1000, #1200, #1500, #2000 metallographic sandpaper to pre-grind the surface to be welded of molybdenum alloy and tungsten alloy in sequence, then polish and ultrasonically clean in alcohol; the treated molybdenum alloy The flatness and roughness of the surface to be welded are 0.06mm and 0.07μm respectively, and the flatness and roughness of the treated tungsten alloy surface to be welded are 0.09mm and 0.05μm respectively.

[0044] Step 2,

[0045] Soak the titanium foil in dilute hydrochloric acid with a volume concentration of 5% for 5 minutes, then ultrasonically clean it in alcohol, and finally dry it for later use.

[0046] Step 3,

[0047] Put the processed molybdenum alloy, titanium foil, and tungsten alloy into the graphite female mold from top to bottom in sequence, and then press it tightly with th...

Embodiment 2

[0057] The SPS diffusion welding of molybdenum alloy and tungsten alloy of the present embodiment is carried out as follows:

[0058] step 1,

[0059] Use #400, #800, #1000, #1200, #1500, #2000 metallographic sandpaper to pre-grind the surface to be welded of molybdenum alloy and tungsten alloy in sequence, then polish and ultrasonically clean in alcohol; the treated molybdenum alloy The flatness and roughness of the surface to be welded are 0.06mm and 0.07μm respectively, and the flatness and roughness of the treated tungsten alloy surface to be welded are 0.09mm and 0.04μm respectively.

[0060] Step 2,

[0061] Soak the titanium foil in dilute hydrochloric acid with a volume concentration of 5% for 5 minutes, then ultrasonically clean it in alcohol, and finally dry it for later use.

[0062] Step 3,

[0063] Put the processed molybdenum alloy, titanium foil, and tungsten alloy into the graphite female mold from top to bottom in sequence, and then press it tightly with th...

Embodiment 3

[0073] The SPS diffusion welding of molybdenum alloy and tungsten alloy of the present embodiment is carried out as follows:

[0074] step 1,

[0075] Use #400, #800, #1000, #1200, #1500, #2000 metallographic sandpaper to pre-grind the surface to be welded of molybdenum alloy and tungsten alloy in sequence, then polish and ultrasonically clean in alcohol; the treated molybdenum alloy The flatness and roughness of the surface to be welded are 0.06mm and 0.08μm respectively, and the flatness and roughness of the treated tungsten alloy surface to be welded are 0.09mm and 0.06μm respectively.

[0076] Step 2,

[0077] Soak the titanium foil in dilute hydrochloric acid with a volume concentration of 5% for 5 minutes, then ultrasonically clean it in alcohol, and finally dry it for later use.

[0078] Step 3,

[0079] Put the processed molybdenum alloy, titanium foil, and tungsten alloy into the graphite female mold from top to bottom in sequence, and then press it tightly with th...

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Abstract

The invention provides an SPS diffusion welding method for a molybdenum alloy and a tungsten alloy. According to the method, titanium foil is used as an intermediate transition layer, solid phase diffusion welding is conducted on the molybdenum alloy and the tungsten alloy through an SPS technology, and a connecting piece of the molybdenum alloy and the tungsten alloy is obtained. By means of the welding method, a molybdenum alloy and tungsten alloy welding piece with the high strength and the good forming is obtained while it can be guaranteed that recrystallization of a base material is avoided, and the joint room temperature shear strength can reach 296 MPa.

Description

technical field [0001] The invention relates to a welding method of dissimilar refractory alloys, in particular to a welding method of molybdenum alloy and tungsten alloy. Background technique [0002] Molybdenum alloy is an alloy formed by adding various alloying elements (such as Ti, Zr, Hf, W and rare earth elements, etc.) to molybdenum as a matrix. It has high recrystallization temperature, excellent high-temperature mechanical properties and good corrosion resistance. It has been widely used in aviation, aerospace, nuclear energy and other fields, such as: using its excellent high-temperature mechanical properties, it can be used for the heat dissipation panel of spacecraft, the nozzle of rocket engine, the valve body of torpedo engine that withstands high temperature, etc.; using its Good corrosion resistance to liquid metals, can be used to make stirring spindles in glass melting furnaces, etc.; can also be used for X-ray rotating anode parts, die-casting molds, isoth...

Claims

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Application Information

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IPC IPC(8): B23K20/00B23K20/02B23K20/14B23K20/16B23K20/24B23K103/18
CPCB23K20/026B23K20/008B23K20/14B23K20/16B23K20/24B23K2103/18
Inventor 张久兴杨芝胡可杨新宇李志
Owner HEFEI UNIV OF TECH
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