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Connecting method for sintering/welding titanium-steel dissimilar metal

A technology of dissimilar metals and connection methods, which is applied to welding/welding/cutting objects, welding equipment, metal processing equipment, etc., can solve the problems of difficult control of small-sized diffusion layers at the interface of gradient layers, and the gradient transition of gradient joints is not uniform enough. Good controllability of connection conditions, achieving gradient uniformity and preventing brittle phase cracking

Active Publication Date: 2014-01-01
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, no one at home and abroad has applied spark plasma sintering technology to the welding connection of dissimilar metals.
Besides the discharge plasma technology, there is currently no welding or sintering technology that can realize the one-time welding and sintering of titanium-steel dissimilar metals plus gradient joints, and the gradient transition of the obtained gradient joints is not uniform enough, and the gradient layer interface is small in size. layers hard to control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The gradient joint is a V-Cu-based gradient alloy, in which vanadium metal and copper metal are the main components. Titanium or its alloy adopts TC4 titanium alloy block, stainless steel adopts 316L stainless steel block, and the expansion coefficient of TC4 titanium alloy block, 316L stainless steel block and V-Cu-based gradient alloy is matched in a gradient change. In order to make the two ends of the V-Cu-based gradient alloy have good connection with the TC4 titanium alloy block and the 316L stainless steel block, the V-Cu-based gradient alloy is mixed with a variety of metal powders in different proportions to form a mixed powder with a gradient matching expansion coefficient The composition is set according to the following gradient: C1+C2+C3, wherein the C1 mixed powder is connected to one side of the TC4 titanium alloy block, the C3 mixed powder is connected to the side of the 316L stainless steel block, and the composition of the C1 mixed powder is: nickel 5%,...

Embodiment 2

[0024] The gradient joint is a V-Cu-based gradient alloy, in which vanadium metal and copper metal are the main components. Ti metal powder is used for titanium or its alloy, and 316L stainless steel powder is used for stainless steel. The expansion coefficient of Ti metal powder, 316L stainless steel powder and V-Cu-based gradient alloy is matched in a gradient change. In order to make the two ends of the V-Cu-based gradient alloy have good connection with Ti metal powder and 316L stainless steel powder, the V-Cu-based gradient alloy is composed of a mixed powder with a gradient matching expansion coefficient obtained by mixing various metal powders in different proportions. The following gradient setting is: C1+C2+C3, where C1 mixed powder is connected to one side of Ti metal powder, C3 mixed powder is connected to one side of 316L stainless steel powder, and the composition of C1 mixed powder is: nickel 5%, vanadium 60%, copper 25 %, aluminum 5%, chromium 5%; C2 mixed powde...

Embodiment 3

[0030] The gradient joint is a V-Cu-based gradient alloy, in which vanadium metal and copper metal are the main components. Titanium or its alloy adopts TC4 titanium alloy block, stainless steel adopts 304SS stainless steel block, and the expansion coefficient of TC4 titanium alloy block, 304SS stainless steel block and V-Cu-based gradient alloy is gradiently matched. In order to make the two ends of the V-Cu-based gradient alloy have good connection with the TC4 titanium alloy block and the 304SS stainless steel block, the V-Cu-based gradient alloy is mixed with a variety of metal powders in different proportions to form a mixed powder with a gradient matching expansion coefficient The composition is set according to the following gradient: C1+C2+C3, wherein the C1 mixed powder is connected to one side of the TC4 titanium alloy block, the C3 mixed powder is connected to the side of the 316L stainless steel block, and the composition of the C1 mixed powder is: nickel 5%, Vanad...

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Abstract

The invention discloses a connecting method for sintering / welding titanium-steel dissimilar metal. The differences of physical properties of the titanium and the steel which are dissimilar metal are large, and the titanium and the steel are hard to connect through conventional methods. According to the connecting method, firstly, the titanium or titanium alloy, V-Cu gradient alloy powder C1, C2 and C3 and stainless steel are placed in a die one by one to be pressed in advance, and secondly, the die is placed in a sintering device to be sintered in a spark plasma mode, wherein the V-Cu gradient alloy powder C1, C2 and C3 are composed of mixed powder which is formed by mixing a plurality of kinds of metal powder according to different proportions, and the expansion factor gradient of the V-Cu gradient alloy powder C1, the expansion factor gradient of the V-Cu gradient alloy powder C2 and the expansion factor gradient of the V-Cu gradient alloy powder C3 are matched with one another. The titanium or the titanium alloy and the stainless steel are directly connected and formed at a time in a sintering mode, the method of spark plasma sintering is particularly suitable for sintering molding of V-Cu gradient connectors of the titanium and the stainless steel, and a titanium-steel dissimilar metal sintering / welding connector can have a high mechanical property.

Description

technical field [0001] The invention belongs to the field of metal processing, and in particular relates to a sintering / welding connection method of titanium-steel dissimilar metals. Background technique [0002] The difference in physical and chemical properties between titanium alloy and stainless steel is very large, and it is very difficult to obtain a good connection joint. At present, electron beam or laser beam and intermediate metal foil transition layer are mostly used at home and abroad for titanium alloy-stainless steel fusion welding connection, but it is still difficult to avoid the generation of brittle intermetallic compounds and stress in the joint, and the joint strength is still difficult to reach 0.7 of the base metal strength. times; at home and abroad, titanium alloy-stainless steel solid-phase welding (diffusion welding, friction welding, explosive welding, hot isostatic pressure diffusion welding) with a single or composite metal foil as the intermedia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B22F7/08C22C27/02C22C9/00B23K28/00B23K103/24
Inventor 周琦张海宁彭勇孔见郭顺王克鸿朱军熊延金蒋佳敏
Owner NANJING UNIV OF SCI & TECH
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