New brazing fillers for high alloys.

Advanced Materials & Processes, February, 1999

Ductile Ni-Hf-base filler metals have been developed at Aachen University of Technology in Germany for brazing stainless steels and superalloys. The fillers contain no boron, silicon, or phosphorus. Heat- and corrosion-resistant joints in stainless steels and superalloys often are made using expensive gold- and nickel-base alloys.

Conventional nickel-base fillers usually have high levels of metalloid elements (boron, phosphorus, and silicon), which are added to depress the high melting temperature of the Ni/Ni-Cr matrix and to serve as a flux, removing oxides from the surface of the material to be brazed. However, the metalloids also have disadvantages. They form brittle phases with components of the nickel alloy matrix. As a result, conventional nickel alloy...

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