Products and Services

  1. Low-erosion filler metals for brazing titanium alloys and titanium aluminides
  2. Heat-resistant brazing filler metals
  3. Low-temperature filler metals for brazing thin-wall titanium articles

Low-erosion filler metals for brazing titanium alloys and titanium aluminides

We produce Ti-Zr-Cu-Ni near-eutectic alloys having the lowest melting points and brazing temperatures amid all conventional filler metals for vacuum joining of titanium. Consequently, brazing with these alloys is carried out at the temperatures below beta-transus points of such base materials as Ti-6Al-4V or titanium Grade 2. We also produce Ti-15Cu-25Ni ( our brand is TiBraze15-25) that has lower brazing temperature than widely used Ti-15Cu-15Ni.

Compositions and brazing temperatures of these alloys are shown in Table 1.

The brazing alloys are supplied in the form of -100/+325 mesh powder.

Table 1
Low-erosion filler metals for brazing titanium at 850-1050 °C (1560-1920 °F)

Brazing AlloyComposition, wt.%Brazing Temperature,
° (°F)
Melting temperatures,
°C (°F)
SolidusLiquidus
TiBraze375Ti-37.5Zr-15Cu-10Ni850-880 (1560-1620)825 (1510)835 (1535)
TiBraze375-MoTi-37.5Zr-15Cu-10Ni-1Mo850-880 (1560-1620)825 (1510)835 (1535)
TiBraze240Ti-24Zr-16Cu-16Ni-0.5Mo890-920 (1630-1690)835 (1535)850 (1560)
TiBraze260Ti-26Zr-14Cu-14Ni-0.5Mo880-920 (1620-1690)840 (1544)860 (1580)
TiBraze200Ti-20Zr-20Cu-20Ni870-900 (1600-1650)848 (1555)856 (1572)
TiBraze200-MoTi-20Zr-20Cu-20Ni-1Mo870-900 (1600-1650)848 (1555)856 (1572)
TiBraze15-25Ti-15Cu-25Ni930-950 (1705-1740)901 (1653)915 (1679)

* No limitation in small size order
** Small size orders up to 10 lbs are delivered within 2-4 weeks, orders over 10 lbs are delivered within 4-8 weeks.
*** Powders are packaged under argon in plastic jars, weighing 1-2 lbs/jar.

All brazing alloys (esp. of Ti-Zr-Cu-Ni system) are modified with small amounts of Hf, Nb, Mo, Cr, or Pd to improve mechanical properties, corrosion resistance, and decrease brazing erosion on titanium base metal.

All these alloys provide satisfactory strength of brazed joints in the working temperature region from RT up to 500°C (930°F). We consider low-erosion Ti-Zr-Cu-Ni near-eutectic alloys to be the most promising filler metals on the market for brazing titanium heat exchangers, honeycombs, or other foil structures.

Also, filler metals TiBraze375 and TiBraze260 were successfully used for brazing titanium aluminides.

OUR PRICES ARE DEFINITELY THE LOWEST ON THE MARKET TODAY,
ESPECIALLY FOR SMALL ORDERS.

All these titanium brazing alloys are being used now in aerospace applications for joining parts of airframe, chassis, and life-support systems (such as honeycomb wings, fuel tanks, stringer components, sandwich-like wing sections, heat exchangers, armor cooling systems, reverse grits, tubing, bulletproof doors), and parts of gas turbine or rocket engines (such as fan blades, compressor vanes, duffusor, disks and seals, nozzle flaps, collar and adapter of combustion chamber, acoustic tile pipes and cowls, impellers, low-pressure turbine seal support, and lightweight honeycomb panels).

Brazing alloys TiBraze375 and TiBraze240 were used for joining fuel cell membranes for prospective engine applications in the automotive industry.

Heat-resistant brazing filler metals

In 2004, we started to produce new filler metals for brazing molybdenum, niobium, tantalum, iron aluminides, nickel aluminides, graphite, and ceramics at ?2192°F (1200°C) to provide reliable work of joints at 600-1000°C. The filler metal TiBraze 1200 is designed specially for TiAl and NiAl joints working up to 800°C (1470°F).

Compositions, temperatures, and prices showed in Table 2.

These filler metals are supplied in the form of -100 mesh and +100 mesh powders

Table 2
Heat-resistant filler metals for brazing titanium, graphite, and refractory metals at 1180-1530 °C (2156-2786°F)

Brazing AlloyComposition, wt.%Brazing Temperature, °C (°F)
TiBraze1200 Ni-27Ti-10Al1180-1280 (2156-2336)
TiBraze1200A Ni-27Ti-10Al-(1-2)Mo1220-1280 (2228-2336)
TiBraze1350 Ti-25Fe-(4-6)Al1300-1350 (2372-2462)
TiBraze1450 Ni-(14-16)Cr-(4-6)Fe1430-1450 (2606-2642)
TiBraze1500 Zr-16Ti-28V-0.5Mo1500-1530 (2732-2786)

* No limitation in small size order
** Small size order up to 10 lbs is delivered within 2-4 weeks, orders over 10 lbs are delivered within 4-8 weeks.

The brazing filler metal TiBraze1450 exhibits shear strength of molybdenum joints 132 MPa at 980°C (1800°F), the brazing filler metal TiBraze1500 - 49-57 MPa at 1100°C (2010°F), and all five alloys showed over 600 MPa at room temperature.

The brazing filler metals TiBraze1200 and TiBraze1350 are suitable for manufacturing heat-resistant joints of titanium aluminide-, nickel aluminide-, and iron aluminide-based alloys.

The joints of hot-pressed and extruded TiAl alloys brazed by filler metals TiBraze1200 and TiBraze1200A are stable up to 900°C (1650°F).

Low-temperature filler metals for brazing thin-wall titanium articles

We also have experience in the application of aluminum-based and magnesium-based filler metals for brazing titanium at low temperature in vacuum and in air (Tables 3 and 4) for joining thin-wall tubing and repair purposes.

These brazing filler metals were supplied in the form of cast rods or wire having diameter of 0.04-0.094 inches (1-2.4 mm).

Table 3
Low-temperature Al-based filler metals for brazing at 540-650°C (1000-1200°F)

Brazing AlloyComposition, wt.%Brazing Temperature,
°C (°F)
Melting temperatures,
°C ( °F)
SolidusLiquidus
TiBrazeAl-540Al-28Cu-6Si-0.2Ti540-570 (1000-1058)525 (975)525 (975)
TiBrazeAl-550Al-20Cu-6Si-2Ni-0.1Ti550-580 (1020-1076)520 (968)540 (1004)
TiBrazeAl-640Al-(4.4-5.2)Mg-(0.7-1)Mn--0.2Cr640-660 (1184-1220)575 (1065)635 (1175)
TiBrazeAl-650Al-2.7Mg-0.8Mn-0.1Cr650-680 (1202-1256)602 (1115)645 (1195)
TiBrazeAl-630Al-1.5Mg-4Cu-2Ni630-660 (1166-1220)510 (950)630 (1166)
TiBrazeAl-620Al-(4.3-5.5)Mg-(0.2-0.4)Si--0.4Fe-0.2Zn620-650 (1148-1202)550 (1022)620 (1148)

Table 4
Low-temperature Mg-based filler metals for brazing at 590-650°C (1095-1200°F)

Brazing AlloyComposition, wt.%Brazing Temperature,
°C (°F)
Melting temperatures,
°C (°F)
SolidusLiquidus
TiBrazeMg-590Mg-10Al-1Zn-0.2Mn590-620 (1095-1148)470 (878)590 (1095)
TiBrazeMg-600Mg-9Al-2Zn-0.2Mn600-620 (1110-1148)445 (835)600 (1110)
TiBrazeMg-610Mg-6.5Al-0.8Zn-0.2Mn610-630 (1130-1166)535 (995)610 (1130)
TiBrazeMg-340Mg-(36-40)Li-(2-4)Al330-360 (644-680)280 (536)320 (608)
TiBrazeMg-640Mg-2.6Zn-0.6Zr-3.2REM640-660 (1184-1220)545 (1015)640 (1184)

Aluminum-based and magnesium-based brazing filler metals are modified with Cr and Ti to refine microstructure of brazing joints, and with Be - to suppress an ignition during the torch brazing.

These filler metals can be used for torch brazing of thin-wall titanium or aluminum articles, for example, for brazing tubing, and repairing fin-plate heat exchangers or honeycomb structures.

Torch brazing is carried out with proprietary non-toxic fluxes TBF-42 or TBF-60 based on fluoride and chloride systems.

Brazing filler metals listed in Tables 3 and 4 can be suitable for vacuum brazing of titanium at the temperatures significantly lower than conventional silver-based and titanium-based filler metals after evaluation their wetting and gap filling abilities, as well as testing strength of brazed joints.

If you have any questions, feel free to call (614) 886-7519 or send a message ashapiro@titanium-brazing.com.
5977 Coventry Cross Ln., Hilliard, OH 43026 Ph: (614) 886-7519, Fax: (614) 540-7493 E-mail: ashapiro@titanium-brazing.com