Metallic Substrates Brazing Alloy

Metallic Substrates for Brazing

In recent years, metallic catalyst supports have begun to replace the ceramic substrates used to support precious metal catalyst. In addition to being sturdier and resilient to vibrations, as well as enabling the unit to be mounted closer to the engine, the metallic supports heat up faster to reduce harmful emissions.

( See Alloy Composition Chart)

Brazing Application

The cells of these units are formed from approximately 100 ┬Ám (4.0 mil) thick corrugated and flat sheet stock. The concentrically wrapped corrugated and uncorrugated metal sheets must be securely fastened to each other forming an integrated core to prevent vibration and potential release of catalyst during engine operation (which would result in unit failure). Brazing is an important technique for manufacturing the advanced metallic catalytic converters, because it achieves fastening of core components and core to the case in one operation.

Solution

When using Metglas Brazing Foils (MBF's) versus powder, smaller, high-quality fillets are formed. As a result, cells become more open, thereby reducing exhaust back-pressure. MBF's foil leaves more effective surface area for the catalyst. Finally, process automation is easily achieved with ductile MBF's foil.

Note: For a typical FeCrAl base metal, MBF's 50 with its low boron content provides superior high temperature strength and corrosion resistance with virtually no base metal erosion.

Metallic Substrated used for brazing catalyst converters



Metglas Brazing Foils can be slit to specific widths and/or stamped into precise shapes for any application.

Metglas Brazing Foil Compositions

  MBF
Alloy
AWS & AMS
Classifications
Nominal Composition, wt. % Melting Temp.
°C (°F)
Braze Temp.
(Approx.)
°C (°F)
Density
g/cm3 (lb/in3)
Cr Fe Si C* B P Mo Ni Solidus Liqiudus
Sample/Price Request 15 13.0 4.2 4.5 0.03 2.8 - - Bal 965
(1769)
1103
(2017)
1135
(2075)
7.2
(0.283)
Sample/Price Request 20 AWS BNi2
AMS 4777
7.0 3.0 4.5 0.06 3.2 - - Bal 969
(1776)
1024
(1875)
1055
(1931)
7.88
(0.285)
Sample/Price Request 30 AWS BNi3
AMS 4778
- - 4.5 0.06 3.2 - - Bal 984
(1803)
1054
(1929)
1085
(1985)
8.07
(0.291)
Sample/Price Request 50 AWS BNi5a 19.0 - 7.3 0.08 1.5 - - Bal 1052
(1924)
1144
(2091)
1170
(2138)
7.70
(0.278)
Sample/Price Request 51 AWS BNi5b 15.0 - 7.25 0.06 1.4 - - Bal 1030
(1886)
1126
(2058)
1195
(2183)
7.73
(0.278)
Sample/Price Request 53 15.0 - 7.3 0.06 1.4 - 5.0 Bal 1045
(1900)
1127
(2060)
1195
(2183)
7.75
(0.280)
Sample/Price Request 60 AWS BNi6 - - - 0.10 - 11.0 - Bal 883
(1621)
921
(1688)
950
(1742)
8.14
(0.294)
Sample/Price Request 62   21.0 <1 0.5 - 0.5 8.0 1.0 Bal 878
(1612)
940
(1724)
1020
(1868)
7.74
(0.280)
Sample/Price Request 64   17.5 4.0 3.0 - 0.75 5.0 1.0 Bal 913
(1675)
978
(1792)
1010
(1850)
7.68
(0.277)
Sample/Price Request 67   25 <1 1.5 - 0.5 6.0 1.5 Bal 890
(1634)
970
(1778)
1100
(2012)
7.70
(0.278)
Sample/Price Request 601   16.0 32 1.5 - 0.5 6.0 1.5 Bal 960
(1760)
1030
(1886)
1060
(1940)
7.57
(0.273)
Sample/Price Request 602   11.0 35 1.5 - 0.5 6.0 1.5 Bal 910
(1670)
1020
(1868)
1050
(1922)
7.6
(0.275)
Sample/Price Request 80 AWS BNi9 15.2 - - 0.06 4.0 - - Bal 1048
(1918)
1091
(1996)
1120
(2045)
7.94
(0.278)
* Maximum concentration

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