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VITROBRAZE

Nickel-based filler metals

Considering the 5000 years of brazing history, the nickel-based filler metals are a very young group of materials. The first Nickel-BFM (brazing filler metals) was developed for joining parts of aero jet engines in 1947. This new group of BFMs and the brazing procedures therefore were in the following decades permanently improved. Modern alloys of this BFM group are optimized in corrosion resistance and bonding strength.Our amorphous VITROBRAZE® filler metal foils will be produced by using the Rapid Solidification Technology, which is also used for our soft magnetic VITROVAC® and VITROPERM® products.

The production of amorphous metals requires a manufacturing technology that operates on the basis of the necessary cooling rates, which is known as rapid solidification.
Amorphous structures are characterized by the absence of a crystal lattice or a long range order. With this random, spatially uniform arrangement of the constituent atoms their structure is similar to that of liquids.The nature of this production process is the reason why amorphous alloys are offered only in the form of thin, ductile metal foils. Subsequently, tapes, parts and premorms can be made by e.g. slitting, cutting, stamping and etching. The typical thickness is between  20 µm and 50 µm. Exceptionally, also foils in other thicknesses can be manufactured.

Information on further VITROBRAZE products is available upon request.

Chemical composition

VAC-product

Chemical composition

 

Ni

Fe

Cr

Mo

Si

B

 

Weight by %

Weight by %

Weight by %

Weight by %

Weight by %

Weight by %

VITROBRAZE 2111

Rest

4.2

13

 

4.5

2.8

VITROBRAZE 2150

Rest

 

18.2

 

7.3

1.15

VITROBRAZE 2120

Rest

3

7

 

4.5

3.2

VITROBRAZE 2133

Rest

 

 

 

4.5

3.2

VITROBRAZE 2188

Rest

8.2

7.3

3

6.7

2.15

Datasheet VITROBRAZE

technical article VITROBRAZE

Applications

Nickel filler metals are used for corrosion, oxidation and heat resistance. A primary merit is the ability to endure high-temperature service, even in moderately aggressive environments. They also are suitable for subzero applications. Nickel brazing foils are used on brazing heat exchangers, metallic catalysts, aircraft parts, food handling components, medical devices as well as aerospace and naval applications. Braze joints made with VITROBRAZE show a consistence performance with tight and leak free joints. Nickel filler metals can be used for brazing low carbon steel, stainless steel, nickel and nickel alloys, cobalt and cobalt alloys, and in some cases for special metals and their alloys.

Advantages of VITROBRAZE

One reason for the superiority of VITROBRAZE products is their amorphous structure. Amorphous materials are compositionally much more uniform even after crystallization, they melt over a narrow temperature range under transient heating. This is a consequence of the shorter distances over which atoms of different elements have to diffuse in order to form a uniform liquid phase. The resulting instant melting, and their superior flow characteristic is only one of the important features of VITROBRAZE. The absence of the residual organic solvent bases evident in powder paste/tapes correspondingly eliminates soot formation and furnace fouling. The low level of gaseous impurities in VITROBRAZE, due to the specific characteristics of its production technology, is an attractive feature for vacuum furnace brazing.
VITROBRAZE nickel-based products have no limitation in shelf life. They are available as strips with a width from 0,5 mm to 125 mm and a thickness from 20 µm to 50 µm. Preforms can be easily produced by using punch and die, cutting/slitting, photochemical etching, and other methods. It is simple to use foils and preforms at automatically production and assembling steps. The use of foils and preforms reduces waste and enhances manufacturing efficiency. Drying and evaporation operations which are required at powder/paste and tape forms are not necessary. The optimal amount of brazing material can be easily applied to the component and in just one heating cycle VITROBRAZE creates uniform braze joints with a outstanding quality.

Typical data of amorphous Ni-based alloys:

strip thickness: t = 17…50 µm (computed average thickness from weight)
strip width: w = 0.5…125 mm
Vickers hardness: HV 0.05 = 700…1000
Young's modulus: 100…150 GPa
tensile strength: 1000…1700 MPa

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Last update: 15.05.2013