September 15, 2006

 

AMORPHOUS TAPES FOR BRAZING TITANIUM AND CERAMICS

 

Our company can supply amorphous tapes 30-40 µm thick and 40-50 µm thick, width 0.8 in. of the following titanium brazing filler metals:

 

 

Tradename

AWS Designation

Composition, wt.%

Melting range

°F (°C)

Brazing range

°F (°C)

TiBraze15-15

BTi-1

Ti-15Cu-15Ni

1655-1742 (902-950)

1800-1920

(980-1050)

TiBraze15-25

BTi-2

Ti-15Cu-25Ni

1653-1679 (901-915)

1705-1760

(930-960)

TiBraze375

BTi-3

Ti-37.5Zr-15Cu-10Ni

1510-1535 (825-835)

1560-1620

(850-880)

TiBraze240

BTi-4

Ti-24Zr-16Cu-16Ni-0.5Mo

1535-1560 (835-850)

1630-1690

(890-920)

TiBraze200

BTi-5

Ti-20Zr-20Cu-20Ni

1555-1572 (848-856)

1560-1620

(870-900)

TiBraze950

 

T-50Cu

955 (1750)

1000-1050 (1832-1922)

 

Amorphous tapes will be supplied in the form of 1-1.5 lb coils.

 

Brazing of the same area of base metal requires amorphous tape from 2 to 2.3 times less in weight units than using powder crystalline brazing filler metal (depending on the particle size of the powder).

 

This means that a customer needs to order at least 2 times less amorphous tape by weight than the powder.

 

Samples of amorphous tapes and microstructure of brazed joints are shown below, in Fig. 1-3.

 

Fig 1.  Samples of titanium amorphous tapes

 

 

 

Microstructures of titanium joints brazed with:

 amorphous tape (a) and powder (b) filler metals

 

 

 

 
 
   

   

 

Fig. 2.  Capillary brazing of Titanium Grade 2. Microstructures and chemical compositions of  brazed joints:

 (à) Ti-Zr-Cu-Ni amorphous tape and (á) the same Ti-Zr-Cu-Ni powder brazing filler metal.

 

 

 

   

   

Fig. 2.  Diffusion brazing of Titanium Grade 2. Microstructures and chemical compositions of  brazed joints:

 (à) Ti-Zr-Cu-Ni amorphous tape and (á) the same Ti-Zr-Cu-Ni powder brazing filler metal.