Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Aluminium brazing sheet

A plate and brazing technology, applied in welding/cutting medium/material, welding medium, welding equipment, etc., can solve the problem of waste disposal, etc., and achieve the effect of eliminating cost, good working environment and saving workshop space

Active Publication Date: 2012-07-11
SAPA HEAT TRANSFER AB
View PDF10 Cites 20 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Bi is considered an impurity in many cases and thus creates waste disposal issues during the manufacturing process
There is also hope for improving the brazing process

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Aluminium brazing sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0055] According to one embodiment, the chemical composition of the thin cladding material comprises

[0056] Bi 0.01-1.0 wt%, preferably 0.05-0.7 wt%, more preferably 0.07-0.5 wt%,

[0057] Mg≤0.05% by weight, preferably ≤0.01% by weight, more preferably 0%,

[0058] Mn≤1.0% by weight,

[0059] Cu≤1.2% by weight,

[0060] Fe≤1.0% by weight,

[0061] Si ≤ 1.9% by weight, preferably ≤ 1.65% by weight, more preferably ≤ 1.4% by weight, most preferably ≤ 0.9% by weight,

[0062] Ti≤0.1% by weight,

[0063] Zn≤6 wt%, Sn≤0.1 wt%, In≤0.1 wt%, and

[0064] Unavoidable impurities each contained less than 0.05% by weight, and the total impurity content was less than 0.2% by weight, with the balance being Al.

[0065] A Si content of 1.9 wt% or less in the thin cladding layer will help the cladding layer to be in a solid state when the solder layer melts, and thus also facilitate wettability and joint formation. Pure aluminum may contain up to 1.65% Si in solid solution at 577°C ...

Embodiment

[0073] All alloys were cast by laboratory casting equipment into so-called stack molds, which were produced into small slabs with a length of 150 mm, a width of 90 mm and a thickness of 20 mm. Table 1 shows the chemical composition of the alloys used to test brazeability.

[0074] Each slab was trimmed, heated from room temperature to 450°C over 8 hours, held at 450°C for 2 hours, and cooled in ambient air. The material is then rolled to the appropriate thickness, with soft annealing between steps when required for easier rolling. The core material-intermediate brazing layer-outer layer material is then combined into a three-layer clad pack, and the layers in the composite pack are brought into contact with each other by cold rolling. The material was cold rolled to a thickness of 0.4mm, this provided a single sided cladding with 8% middle layer and 2% outer layer with an intermediate softening anneal when required to provide easy rolling and give a final back anneal , so th...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

A multi layered aluminium alloy brazing sheet consisting of: a core material that on either one or both sides has an intermediate layer consisting of an Al-Si braze alloy interposed between the core and a thin covering layer on top of the intermediate layer, where the said core material and the covering layer has a higher melting temperature than the Al-Si, braze alloy, the covering layer containing Bi 0.01 to 1.0 wt%, Mg <= 0.01 wt%, Mn <= 1.0 wt%, Cu = 1.2 wt%,Fe <= 1.0 wt%, Si <= 4.0 wt%,Ti <= 0.1 wt%, Zr, Cr, V and / or Sc in total <= 0.2%, and unavoidable impurities each in amounts less than 0.05 wt%, and a total impurity content of less than 0.2 wt%, the balance consisting of aluminium; and a heat exchanger comprising the alloy brazing sheet.

Description

technical field [0001] The present invention relates to an improved multilayer aluminum brazing sheet comprising a core material and an outer cladding layer clad with a brazing alloy as an intermediate layer. The invention also relates to a heat exchanger comprising said improved multilayer aluminum brazing sheet. Background technique [0002] The present invention relates to sheet materials for joining by brazing of aluminum materials in an inert or reducing atmosphere without the use of fluxes to rupture, dissolve or remove surface oxide layers. [0003] The current challenge is to manufacture materials and components for the heat exchanger industry at the lowest possible final cost and with the highest possible quality. One technique commonly used in heat exchanger manufacture is brazing in a controlled atmosphere usually consisting of nitrogen containing as little oxidizing impurities as possible. This method is known as controlled atmosphere brazing ("CAB"), and invol...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/00B23K35/02B23K35/28B23K35/38B32B15/01C22C21/02F28F21/08
CPCB23K35/286C22C21/02F28F21/089B23K35/0238B23K35/383B23K35/002B32B15/016Y10T428/12764B23K1/0012B32B15/01F28F21/084
Inventor D·亚伯拉罕松R·韦斯特高T·斯滕奎斯特
Owner SAPA HEAT TRANSFER AB
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com