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Method for preparing steel/aluminium composite material

A technology of aluminum composite materials and deformed aluminum alloys, which is applied in the direction of metal material coating process, manufacturing tools, welding equipment, etc., can solve the problems of affecting electrical conductivity and bonding strength, aluminum surface oxidation, and low yield strength of aluminum, etc., to overcome High contact resistance, suppressing generation effect

Inactive Publication Date: 2006-03-29
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are three problems in the following three aspects of the steel / aluminum direct thermal compounding process: first, the aluminum surface will be oxidized at high temperature, which will affect the metallurgical bonding rate of the steel / aluminum joint surface; Generate intermetallic compound FeAl which affects the bonding strength of steel and aluminum 3 ; At the third high temperature, the yield strength of aluminum is small, and it is easy to form large-scale yield
Thus affecting the conductivity and bonding strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] Example 1: First, put the deformed aluminum alloy YL12 with a melting point of 500-635°C and a normal temperature yield strength of 325MPa in NaSnO containing 45 grams per liter. 3 , in a tin solution of 10 grams of potassium sodium tartrate and 10 grams of potassium pyrophosphate, soak tin at 65 ° C for 3 minutes, and form a layer of low-melting anti-oxidation metal film with a thickness of 5 μm on the surface of the deformed aluminum alloy to prevent aluminum The alloy is oxidized when heated, so that the hot extrusion process is carried out at a higher temperature; then the pure copper powder with a particle size of 5-50 μm is sprayed on the surface of the stainless steel by cold spraying method to form a metal transition layer with a thickness of 1mm. There is no chemical reaction between the transition layer and steel and aluminum, and it is easy to diffuse. During hot extrusion, the elements of the transition layer diffuse to both sides of the steel and aluminum to...

Embodiment 2

[0008] Example 2: First, put the deformed aluminum alloy YL12 with a melting point of 500-635°C and a normal temperature yield strength of 325MPa in NaSnO containing 55 grams per liter. 3 , in a tin solution of 10 grams of potassium sodium tartrate and 10 grams of potassium pyrophosphate, at 62 ° C, immerse tin for 5 minutes, and form a layer of low-melting anti-oxidation metal film with a thickness of 10 μm on the surface of the deformed aluminum alloy; The stainless steel surface adopts cold spraying method to spray pure nickel powder with a particle size of 5-50 μm on the stainless steel surface to form a metal transition layer with a thickness of 1 mm; finally, the deformed aluminum alloy with surface anti-oxidation treatment and the stainless steel with transition layer are placed In the vacuum hot extrusion furnace, the hot-press diffusion bonding was carried out at 480°C and the pressure was 12MPa for 60 minutes. During the hot-press diffusion, the temperature along the ...

Embodiment 3

[0009] Example 3: First, the deformed aluminum alloy YL12 with a melting point of 500-635°C and a normal temperature yield strength of 325 MPa is placed in NaSnO containing 65 grams per liter. 3 , in a tin solution of 10 grams of potassium sodium tartrate and 10 grams of potassium pyrophosphate, at 55 ° C, immerse tin for 7 minutes, and form a layer of low-melting anti-oxidation metal film with a thickness of 10 μm on the surface of the deformed aluminum alloy; The stainless steel surface adopts the cold spraying method to spray the copper / nickel mixture powder with a particle size of 5-50 μm containing 20% ​​nickel in atomic percentage and the balance is copper on the stainless steel surface to form a metal transition layer with a thickness of 1 mm; finally, the surface will be finished. Anti-oxidation treated deformed aluminum alloy and stainless steel with transition layer are placed in a vacuum hot extrusion furnace at 500°C and a pressure of 8 MPa for hot-press diffusion b...

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Abstract

A process for preparing steel-aluminium composition includes such steps as dipping the deforming Al-alloy in Sn (or Zn) solution for generating a layer of low-smelting-point antioxidizing metal film on its surface, coating a metallic transition layer not reacting on steel and Al on the surface of stainless steel, and hot pressing them in a vacuum hot extruding furnace. Its advantages are high electric conductivity and no generation of FeAl3.

Description

technical field [0001] The invention relates to a preparation method of a composite material, in particular to a preparation method of a steel / aluminum composite material suitable for electric traffic tracks. Background technique [0002] Conductor Rail (Conductor Rail or Electric Rail) is also called the third contact rail (3 rd Rail), it is laid in parallel with two running rails (Wright Bearing Tracks), through the current collector (Current Collector) sliding on it at high speed, the system energy of up to 500-1000V, 500-2000A can be delivered to the power on the running track locomotive. The collector shoe is fixed on the electric locomotive, slides on the conductor rail at high speed at the same speed as the locomotive and maintains a certain contact pressure with the conductor rail, so as to ensure the effective transmission of current. Therefore, the conductive rail must meet certain mechanical properties and electrical properties, such as good electrical conducti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/60B23K31/02B60M1/30
Inventor 成小乐高义民邢建东鲍崇高杨建
Owner XI AN JIAOTONG UNIV
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