Amorphous alloy for BRAZING FILLER METALS

Amorphous brazing filler metal is a metal foil that does not have a long-period crystal structure like ordinary steel or stainless steel. Ni-based amorphous brazing filler metal can contain a wide range of alloying elements such as Ni, Cr, Fe, B, Si, Mo, and P, making it possible to design a wide variety of alloys depending on the required performance.

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Feature

Products photo

Amorphous brazing filler metal has the following characteristics.

  • Toughness, flexibility, 100% metal
  • Melts quickly over a narrow temperature range
  • Strongly bonded with few voids
  • Can be installed between joining parts with high precision
  • Economical and efficient (compared to powder brazing filler metal)
  • Assembly process can be reduced
  • No contamination of the environment or brazing furnace
  • Easy to punch and bend

Reducing the amount of brazing filler metal

Since it is in the form of a foil with a thickness of 25 to 40 μm,
the amount used can be reduced by approximately 50% compared to paste,
contributing to lower brazing material costs.

Comparison of usage reduction rate
(compared to our company)

Filler metal Filler thickness
(μm)
Net filler
usage amount (g)
Usage reduction
rate (%)
BNi-15 paste - 3.308 100
MBF67 foil 38.1 2.309 30
MBF67 foil 25.4 1.560 53

Fewer voids at brazed joint

Since solder foil does not contain a binder like paste material, there are almost no voids (cavities) formed in the bonding layer due to the binder removal process, resulting in a highly reliable bonded product.

Figure: Cross section of stainless steel SUS316 after brazing (our comparison)

Application

EGR cooler

Plate-Heat exchanger

Metallic catalytic
substrate

Exhaust heat
recovery unit

Stamped
Brazing Foil

Product lineup

MBF
Alloy
AWS & AMS
Standard
Nominal Composition
(wt %)
Temperature
(℃)
Brazing
temperature
(℃)
Density x 103
(kg/m3)
Cr Fe Si C* B P Mo Ni Solidus Liquidus
15   13.0 4.2 4.5 0.03 2.8 - - Bal 965 1103 1135 7.82
20 AWS
BNi-2
/AMS
4777
7.0 3.0 4.5 0.06 3.2 - - Bal 969 1024 1055 7.88
30 AWS
BNi-3
/AMS
4778
- - 4.5 0.06 3.2 - - Bal 984 1054 1085 8.07
50 AWS
BNi-5a
19.0 - 7.3 0.08 1.5 - - Bal 1052 1144 1170 7.70
51 AWS
BNi-5b
15.0 - 7.3 0.06 1.4 - - Bal 1030 1126 1195 7.73
60 AWS
BNi-6
- - - 0.1 - 11.0 - Bal 890 890 920 8.14
62   21.0 <1 0.5 - 0.5* 8.0 1.0 Bal 878 940 1020 7.74
67   25.0 <1 1.5 - 0.5* 6.0 1.5 Bal 890 970 1020 7.70
601   16.0 32 1.5 - 0.5* 6.0 1.5 Bal 960 1030 1060 7.57
80 AWS
BNi-9
15.0 - - 0.06 4.0 - - Bal 1048 1091 1120 7.94
  • *(Maximum concentration)

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