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A liquid-solid connection method of copper-tungsten pseudo-alloy and stainless steel special-shaped parts

A connection method and pseudo-alloy technology, applied in welding equipment, metal processing equipment, welding/welding/cutting items, etc., can solve the problems of low interface bonding force, impenetrable welding, uncontrollable interface defects, etc., and achieve interface stability Improvement, the effect of high bonding strength

Active Publication Date: 2016-06-01
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a liquid-solid connection method between copper-tungsten pseudoalloy and stainless steel special-shaped parts, which solves the problems of impenetrable welding, uncontrollable interface defects, low interface bonding force, and reduced material properties near the bonding area in the existing welding methods. The problem

Method used

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  • A liquid-solid connection method of copper-tungsten pseudo-alloy and stainless steel special-shaped parts
  • A liquid-solid connection method of copper-tungsten pseudo-alloy and stainless steel special-shaped parts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Step 1, the stainless steel bar material that is made of 1Cr18Ni9Ti is machined to remove the oxide layer and then processed into figure 1 Dimensions shown; Copper-tungsten pseudo-alloy rods with a copper content of 20-30wt% are processed into figure 2 The size shown, then soaked in acetone reagent for ultrasonic vibration to remove surface oil;

[0021] Step 2, soak the stainless steel obtained in step 1 in 30% (volume) hydrochloric acid solution for 30 minutes, then neutralize the residual acid on the surface in 20 percent NaOH solution for 3 minutes, and rinse the surface with distilled water;

[0022] Step 3, soaking the copper-tungsten pseudo-alloy obtained in step 1 in a concentration of 50% HNO 3 Corrode in the solution for 100min, immersion depth is 1mm, then use 20% NaOH solution to neutralize the acid remaining on the surface for 5min, and wash with distilled water to obtain a copper-tungsten pseudoalloy with a porous surface;

[0023] Step 4, place a thin ...

Embodiment 2

[0025] Step 1, the stainless steel bar material that is made of 1Cr18Ni9Ti is machined to remove the oxide layer and then processed into figure 1 Dimensions shown; Copper-tungsten pseudo-alloy rods with a copper content of 20-30wt% are processed into figure 2 The size shown, then soaked in acetone reagent for ultrasonic vibration to remove surface oil;

[0026] Step 2, soak the stainless steel obtained in step 1 in 30% (volume) hydrochloric acid solution for 90 minutes, then neutralize the acid remaining on the surface in 20 percent NaOH solution for 5 minutes, and rinse the surface with distilled water;

[0027] Step 3, soaking the copper-tungsten pseudo-alloy obtained in step 1 in a concentration of 50% HNO 3 Corrosion in the solution for 180min, immersion depth is 1mm, then use 20% NaOH solution to neutralize the residual acid on the surface for 1min, and wash with distilled water to obtain copper-tungsten pseudoalloy with porous surface;

[0028] Step 4, place a thin la...

Embodiment 3

[0030] Step 1, the stainless steel bar material that is made of 1Cr18Ni9Ti is machined to remove the oxide layer and then processed into figure 1 Dimensions shown; Copper-tungsten pseudo-alloy rods with a copper content of 20-30wt% are processed into figure 2 The size shown, then soaked in acetone reagent for ultrasonic vibration to remove surface oil;

[0031] Step 2, soak the stainless steel obtained in step 1 in 30% (volume) hydrochloric acid solution for 120min, then neutralize the acid remaining on the surface in 20% NaOH solution for 1min, and rinse the surface with distilled water;

[0032] Step 3, soaking the copper-tungsten pseudo-alloy obtained in step 1 in a concentration of 50% HNO 3 Corrosion in the solution for 60 minutes, the immersion depth is 1 mm, then neutralize the acid remaining on the surface with 20% NaOH solution for 3 minutes, and wash with distilled water to obtain a copper-tungsten pseudoalloy with a porous surface;

[0033] Step 4, place a thin l...

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Abstract

The invention discloses a liquid-solid connection method between a copper-tungsten pseudo-alloy and stainless steel special-shaped parts. The passivation film on the surface of the stainless steel is removed by pickling, and the surface of the copper-tungsten pseudo-alloy is corroded to be porous, and then the copper-tungsten pseudo-alloy A thin layer of amorphous / fine-grained low-chromium copper strip is placed between the stainless steel and placed together in a graphite crucible for welding in a computer-programmed high-temperature sintering furnace. The liquid-solid connection method of the copper-tungsten pseudo-alloy and stainless steel special-shaped parts of the present invention can be welded in a narrow temperature range by using the amorphous / fine-grained low-chromium copper thin strip as the intermediate connection layer, which not only ensures the melting of copper, but also ensures that the steel It is not softened, and has both the excellent properties of the two materials at the same time, which solves the problem of connecting bimetallic shaped parts; and the obtained interface has no defects, high bonding strength, and significantly improved interface stability.

Description

technical field [0001] The invention belongs to the technical field of connecting heterogeneous materials and special-shaped parts, and in particular relates to a liquid-solid connection method for a copper-tungsten pseudo-alloy and stainless steel special-shaped parts. Background technique [0002] Copper-tungsten pseudoalloys are widely used in aerospace, nuclear energy engineering, machinery manufacturing, electronic components and other fields because of their high electrical conductivity, high thermal conductivity, low contact resistance, high melting point of tungsten, high hardness, and low thermal expansion coefficient. It has a broad application prospect, but its use is greatly restricted due to its large specificity and high cost; and low-cost stainless steel is often combined with high cost and good comprehensive performance due to its advantages of corrosion resistance and good mechanical properties. The alloy connection is made into a structural part whose compr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K31/02
CPCB23K31/02B23K2103/18
Inventor 梁淑华张乔邹军涛肖鹏杨晓红
Owner XIAN UNIV OF TECH