Transient liquid phase diffusion bonding process of molybdenum copper alloy and stainless steel

A technology of molybdenum-copper alloy and instantaneous liquid phase, which is applied in the field of diffusion connection and instantaneous liquid phase diffusion connection of molybdenum-copper alloy and stainless steel, which can solve the problem of high cost of solder, limited application range, and limited high-temperature application of molybdenum-copper alloy and stainless steel joints, etc. problem, to achieve the effect of increasing the contact area, promoting rapid diffusion, and facilitating the diffusion reaction

Inactive Publication Date: 2013-08-21
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a small amount of Fe-Mo intermetallic compounds in the fusion zone on the side of the molybdenum-copper alloy, and the accumulation of these intermetallic compounds limits the high-temperature application of the molybdenum-copper alloy and sta...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: Molybdenum-copper alloy plate of 40mm×40mm×3mm is connected by instantaneous liquid phase diffusion to a 1Cr18Ni9Ti austenitic stainless steel plate of 40mm×40mm×3mm.

[0027] The specific process steps are as follows:

[0028] (1) Polish the surface of the molybdenum-copper alloy to be welded with metallographic sandpaper to make the surface roughness reach Ra2.5μm, then wipe it with alcohol and dry it. In addition, the surface of the 1Cr18Ni9Ti stainless steel sheet was pickled with 15% hydrochloric acid for 8 minutes, washed with water, and dried; the surface of the stainless steel to be welded was polished with metallographic sandpaper to make the surface roughness Ra2.5μm, and then wiped the surface with alcohol Clean and blow dry.

[0029] (2) between the molybdenum-copper alloy and the 1Cr18Ni9Ti stainless steel contact surface to be welded, the order of molybdenum-copper alloy-titanium foil (containing niobium powder)+copper foil+titanium foil (conta...

Embodiment 2

[0032] Embodiment 2: Molybdenum-copper alloy plate of 40mm×40mm×2.5mm is connected by instantaneous liquid phase diffusion to 1Cr17Mo ferritic stainless steel plate of 40mm×40mm×2.5mm.

[0033] The specific process steps are as follows:

[0034] (1) Polish the surface of the molybdenum-copper alloy to be welded with metallographic sandpaper to make the surface roughness reach Ra4.0μm, then wipe it with alcohol and dry it. In addition, the surface of the 1Cr17Mo ferritic stainless steel plate to be welded was pickled with 10% sulfuric acid for 10 minutes, washed with water, dried, and then the surface of the steel to be welded was polished with metallographic sandpaper to make the surface roughness reach Ra5.2μm; Wipe the surface clean with alcohol and blow dry.

[0035] (2) Between the molybdenum-copper alloy and the 1Cr17Mo stainless steel contact surface to be welded, the order of molybdenum-copper alloy-titanium foil (containing niobium powder)+copper foil+titanium foil (c...

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Abstract

The invention discloses a transient liquid phase diffusion bonding process of molybdenum copper alloy and stainless steel. The transient liquid phase diffusion bonding process comprises the following steps that (1) before welding, the surfaces to be welded of the molybdenum copper alloy and the stainless steel are cleaned, wiped and blown to be dry until the surfaces to be welded show metallic luster; (2) a composite middle layer is added between contacting surfaces to be welded of the molybdenum copper alloy and the stainless steel, and then a workpiece to be welded is put in a vacuum chamber and is pressed tightly through an upper pressing head and a lower pressing head; (3) when the vacuum chamber is vacuumized until the vacuum degree reaches 10-4 Pa, transient liquid phase diffusion welding is carried out on the assembled workpiece made of the molybdenum copper alloy and the stainless steel; (4) cooling is carried out after welding, and the welding workpiece made of the molybdenum copper alloy and the stainless steel is taken out. The transient liquid phase diffusion bonding process of the molybdenum copper alloy and the stainless steel completely achieves diffusion bonding between the molybdenum copper alloy and the stainless steel, can obtain a diffusion bonding connector made of the molybdenum copper alloy and the stainless steel with the shearing strength reaching 120 M Pa, can meet the use requirements of a composite structure made of the molybdenum copper alloy and the stainless steel, and has the advantages of being low in cost, simple, convenient, high in applicability, convenient to popularize and apply and the like.

Description

technical field [0001] The invention relates to a diffusion connection method for molybdenum-copper alloy and stainless steel, in particular to a method for instant liquid phase diffusion connection of molybdenum-copper alloy and stainless steel, which belongs to the technical field of welding of dissimilar materials. Background technique [0002] With the strengthening of the functions of electronic devices, the miniaturization of volume and the increase of power, the requirements for high temperature performance and heat dissipation performance of electronic sealing materials are getting higher and higher. Molybdenum-copper alloy has good electrical and thermal conductivity, relatively stable coefficient of thermal expansion, and appropriate mechanical strength, and can be used at relatively high temperatures. It is highly valued as an electronic sealing material. [0003] When welding molybdenum-copper alloy and stainless steel, due to the large difference in thermophysic...

Claims

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Application Information

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IPC IPC(8): B23K20/16B23K20/24B23K20/26
Inventor 王娟刘强李亚江
Owner SHANDONG UNIV
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