- Cobalt containing alloys, ranging from 9-20 wt%
- Developed specifically for aerospace applications and the transient liquid phase (TLP) diffusion bonding process
- Highest solidus temperature out of any Metglas products for MBF91 and 92
- MBF91 contains niobium, which is a gamma prime phase former in super alloys
- Trials are currently being run on the XD-line
New MBF601 and MBF602 Alloy Composition
Available as a flexible 100% metallic foil having 18-50 um (0.7-2.0 mil) thickness and 50 mm (2″) width. Foil wider width may be supplied on a special request.
MBF-90 series have excellent high temperature and corrosive resistance. These alloys were specially designed to join super-alloys using TLP bonding.
| Alloy | Nominal Composition, wt % | Temp | Density g/cm | |||||||
| Ni | Cr | Co | Nb | B | Si | Other | Solidus | Liquid | ||
| MBF 90 | Bal | – | 20 | – | 2.7 | 4.0 | <0.5 | 966 (1770) |
1060 (1940) |
0.303 |
| MBF 91 | Bal | 14.0 | 9.0 | 4.0 | 4.0 | – | <0.5 | 1065 (1949) |
1104 (2019) |
TBD |
| MBF 92 | Bal | 14.0 | 9.0 | – | 4.0 | – | <0.5 | 1064 (1947) |
1082 (1980) |
TBD |
Recommendations:
Aircraft and power turbines, jet engine honeycombs, heat exchangers, fuel-cell elements and chemical apparatuses
TLP Diffusion Brazing Process
- TLP diffusion bonding is a brazing process where the brazing filler metal acts as a catalyst to encourage diffusion between the base metals.
- Typically this is a two step process where the filler metal is melted in the brazing step and then diffusion occurs after a second stage annealing cycle
- These are very long cycle times ~2-8 hours but the resulting strength of the joint approaches the base material strength.
- Alloys
-
New MBF601 and MBF602 Alloy Composition
Available as a flexible 100% metallic foil having 18-50 um (0.7-2.0 mil) thickness and 50 mm (2″) width. Foil wider width may be supplied on a special request.
MBF-90 series have excellent high temperature and corrosive resistance. These alloys were specially designed to join super-alloys using TLP bonding.
Alloy Nominal Composition, wt % Temp Density g/cm Ni Cr Co Nb B Si Other Solidus Liquid MBF 90 Bal – 20 – 2.7 4.0 <0.5 966
(1770)1060
(1940)0.303 MBF 91 Bal 14.0 9.0 4.0 4.0 – <0.5 1065
(1949)1104
(2019)TBD MBF 92 Bal 14.0 9.0 – 4.0 – <0.5 1064
(1947)1082
(1980)TBD Recommendations:
Aircraft and power turbines, jet engine honeycombs, heat exchangers, fuel-cell elements and chemical apparatuses
- Diffusion
-
TLP Diffusion Brazing Process
- TLP diffusion bonding is a brazing process where the brazing filler metal acts as a catalyst to encourage diffusion between the base metals.
- Typically this is a two step process where the filler metal is melted in the brazing step and then diffusion occurs after a second stage annealing cycle
- These are very long cycle times ~2-8 hours but the resulting strength of the joint approaches the base material strength.