High Strength Brazed Joint BNi?2Powder Rite Material
Watch out:? Higher brazing temperature than BNi-2; no chromium →limited oxidation resistance at elevated service temperatures
How to Decide — Quick Decision Tree
Step 1:? Does the part need oxidation/corrosion resistance at hightemperature?
Yes → BNi-2
No → Go to Step 2
Step 2:? Is the joint clearance very tight (≤0.05 mm) or theoverlap very long?
Yes → BNi-3
No → Go to Step 3
Step 3:? Do you need more ductility or he wider gaps (0.05–0.15mm)?
Yes → BNi-4
Still unsure → BNi-2? (it covers most cases)
One-Line Summary
4. Good corrosion resistance: Chromium addition providessatisfactory resistance to oxidation and moderate corrosiveenvironments. Note: Boron may diffuse into thin-walled substratesand form brittle intermetallic phases if process parameters are notwell controlled.
5. Flexible product forms: Gas-atomized BNi-2 powder features highsphericity and good flowability, easy for making brazing paste;amorphous BNi-2 foil delivers consistent thickness for precisionassembly.
Main Applications
Aerospace & Aviation
BNi-2 is a standard vacuum brazing filler for aerospace components.It is used to join stainless steel and superalloy parts foraircraft turbine cold-section assemblies, aerospace heatexchangers, honeycomb structures, engine manifolds and valvecomponents, serving under combined high temperature, thermalcycling and mechanical load.Rite Material
Degrease with acetone or suitable solvent
Remove scale, oxide, and fingerprints
Even tiny oil traces can cause voids, skipping, or weak joints
3. Use the right atmosphere
BNi-2 is made for vacuum, high-purity argon, or very dryhydrogen.
Air furnaces are not recommended
Poor atmosphere → chromium oxidation, black joints, poorwetting
No flux needed in vacuum brazing
BNi-2 Nickel-Based Brazing Filler Metal (Full English Version)
BNi-2 is a widely used nickel-base brazing alloy conforming to AWSA5.8 and AMS 4777 specifications, ailable in powder, amorphous foiland paste forms. Its nominal chemical composition (wt%) isNi-7Cr-4.5Si-3Fe-3B. The solidus temperature is 970°C and li°C; the recommended brazing temperature is 1050°C or higher,typically applied under vacuum or inert protective atmosphere suchas argon and hydrogen.Rite Material
Low Oxygen BNi?2 Alloy Powder for Vacuum Brazing