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Brazing sheet and method

a brazing sheet and aluminum alloy technology, applied in the direction of soldering equipment, manufacturing tools, light and heating equipment, etc., can solve the problems of changing the dynamics of the interior of the tube, the inside and outside of the tube are corroded, and the inside of the tube is affected

Inactive Publication Date: 2006-02-16
PECHINEY ROLLED PRODS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a brazing sheet composite that includes an aluminum core alloy and an aluminum clad material. The clad material can be used as the inner-liner of heat exchanger products such as radiator or heater core tubes. The composite has one side with a material that includes 0.7-2.0% Mn and 0.7-3.0% Zn, and the other side with a clad aluminum alloy that includes at least 5.5% Si for brazing purposes. The patent also provides methods for preparing brazing sheets, using them as tube stock, and heat exchangers. The technical effect of this invention is to provide a brazing sheet composite that has improved properties for use in heat exchangers, including better corrosion resistance, improved mechanical strength, and better thermal conductivity.

Problems solved by technology

However, substantial problems exist with corrosion of traditional tube stock core alloys from both the interior and exterior of the tube.
Particularly, problems arise on the inside of the tubes due to erosion / corrosion of the clad layer which occurs due to the extremely high velocity of coolant that is moving through the tubes.
Again, the increase in fluid flowing through the tubes will, in turn, change the dynamics of the interior of the tubes and will even erode the interior due to high pressures and flow rates over time.

Method used

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  • Brazing sheet and method
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Examples

Experimental program
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Effect test

example 1

[0036] Eight aluminum composite materials were tested using the following as a clad alloy: [0037] 1) 7072[0038] 2) 1145[0039] 3) 3003+ Zn [0040] 4) 3003− low Fe [0041] 5) 3005; and [0042] 6) no inner liner

[0043] The specific inner-liner alloy compositions and core alloy designations for these materials are listed in Table 2 as CA I through CA6. and VB 1 and VB2. Two commercial aluminum radiators were also tested whose tubes were made from materials CA1 and CA6. The CA designation indicates that the brazing operation was conducted in a controlled atmosphere (anhydrous nitrogen) and the VB designation indicates that the brazing operation was conducted in vacuum. Three additional aluminum composite materials CA7-CA9 are prepared in a similar manner to CA5 and CA6.

TABLE 2Chemical Composition of clad in weight %Alloy DesignationSiFeCuMnMgZnOthers% cladCA1.06.20.01.01.011.010CA2.06.20.01.01.011.010CA3.07.38.01.01.011.010CA4NONECA5.06.20.011.0.01.0110CA6.06.20.011.0.011.010CA7.06.20.011...

example 2

[0049]FIGS. 6 and 7 show examples of test equipment that include methodology for reproducing corrosion / erosion dynamics. This test equipment was designed in accordance with ASTM D2570-91. Standard Test Method for Simulated Service Corrosion Testing of Engine Coolant. In this case the tank is made of aluminum to simulate an aluminum engine block, the pump is plastic and the test cell is of a design to insure laminar flow.

[0050] With regard to velocity, the flow is measured and reported in liters per minute (“lpm”) of flow through 1½″ fittings. Ball valves are incorporated in both halves of the system, so the system can go as high as approximately 100 LPM and as low as desired by simply closing the valves. The coolant flow can be adjusted so that the test coupons are exposed to an equivalent flow rate per unit surface area as the radiator. The inventive combination of a material with at least two layers, (particularly preferably at least 3 layers) one of which is an inner liner inclu...

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Abstract

The present invention is directed to a brazing sheet comprising an aluminum 3xxx series core alloy wherein at least one side thereof is provided with an aluminum clad material comprising from 0.7-2.0% Mn, 1.3-3.0% Zn, 0.05 Mg max, and 0.05-0.4% Cu. In one embodiment another side of the core is provided with an aluminum alloy comprising at least 5.5% Si. There are further provided methods for preparing brazing sheets as described herein as well as methods for use of brazing sheet materials including as tube stock and as heat exchangers, as well as other applications.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] The present application claims priority from U.S. Patent Application Ser. No. 60 / 261,161 filed Jan. 16, 2001, which is incorporated herein by reference in its entirety.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates generally to aluminum alloy brazing sheet materials including brazing sheet tube stock, and more particularly to erosion / corrosion resistant clad aluminum alloy brazing sheet materials as well as to methods for their manufacture and use. [0004] 2. Description of Related Art [0005] In the recent past, automobile manufacturers have increasingly turned to employing aluminum radiators, heater cores, evaporators, condensers and other heat exchangers due to aluminum's superior properties, especially in terms of strength, durability, weight and corrosion resistance. Aluminum heat exchanger materials must meet several demanding properties in order to be acceptable for long term use i...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B32B15/00B23K35/02B23K35/14B23K35/28B23K35/40B32B15/01C22C21/00F28F21/08
CPCB23K1/0012Y10T428/12493B23K35/286B23K2201/14B32B15/016C22C21/00C22C21/02C22C21/10F28F21/084F28F21/089Y10S165/905Y10S428/933Y10S428/924Y10T428/12507Y10T428/12764B23K35/0238B23K2101/14B23K35/02
Inventor GOODRICH, H. SCOTTPALMER, SCOTT L.JOHNSON, GREGORY R.CONNOR, ZAYNA M.
Owner PECHINEY ROLLED PRODS