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

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)
MBF Alloy	AWS & AMS Standard	Cr	Fe	Si	C^*	B	P	Mo	Ni	Solidus	Liquidus	Brazing temperature (℃)	Density x 10³ (kg/m³)
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)

Online purchase

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Q&A

What is the thickness of the brazing foil material?

Standard thicknesses are 25.4 μm and 38.1 μm. Some alloys are also available in 50.8 μm and 76.2 μm sizes.

What is the maximum width of the brazing foil material?

The maximum width is 215.9 mm.

How many kg is the minimum order lot?

30kg/lot. Please contact us for sample products.

How long is the lead time?

It will take about 3 to 4 months after you place your order.

Do you have an agent who can order samples?

Please contact to Metglas^™, Inc.

https://metglas.com/

What is the mechanical strength of the brazed joint with brazing foil after joining?

It has the same bonding strength as paste brazing filler metal.

Please tell me about the atmosphere during brazing.

Vacuum brazing or atmosphere brazing (nitrogen, inert gas, etc.).

Is it possible to join ceramics?

Our series does not include brazing filler metals for ceramics bonding. Active filler metals are used for ceramics bonding.

Does brazing foil material have an expiration date?

Since it is made of metal foil, it can be stored for a long time (does not contain binders, etc.).

Q10

What is the best brazing foil material to use for brazing stainless steel and stainless steel?

Copper brazing filler metals are used because of their high bonding strength and nickel alloy brazing filler metals are used because of their high heat resistance and high corrosion resistance.

Q11

Is it possible to punch out brazing foil material?

It is possible.

Q12

Please tell me the difference between brazing and welding.

In contrast to welding, which joins materials by melting the base materials, brazing joins materials without melting the base materials. Therefore, it is excellent for joining small parts that are difficult to weld.

Q13

Can brazing foil material be used to join objects with complex shapes?

The brazing material that joins the base materials melts and penetrates the fine details between the parts due to capillary action, making it possible to join complex shapes.

Q14

What are the main uses of brazing foil materials?

Nickel alloy brazing filler metals are mainly used for metal joining applications such as plate heat exchangers for high-efficiency water heaters, various industrial heat exchangers, EGR (Exhaust Gas Recirculation) coolers, metallic catalytic substrates, etc.

Q15

What are the advantages of brazing foil?

Can be installed between joined parts with high precision, reducing assembly man-hours.

Q16

What are the advantages of brazing foil material compared to paste brazing material?

Reduces the amount of brazing filler metal used (compared to paste) and provides strong bonding with fewer voids. Moreover, reduces CO₂ emissions by omitting the binder removal process, since it does not contain a binder and is environmentally friendly.