| Abstract Scope |
Refractory metals share many characteristics which make them desirable as engineering materials, such as high-temperature strength and corrosion resistance. Due to their high melting points and sensitivity to embrittlement from interstitial elements, these metals are difficult to join by traditional fusion welding. Vacuum brazing of refractories presents a desirable alternative since brazing operations occur at lower temperatures than welding and in a contaminant-free environment. Though there are many fillers that are suggested for refractory metals, differing filler metals are more suitable for certain refractory metals and not others. This study examined various filler metals, including Nioro, Palniro-1, Palcusil-5, Palcusil-25, Cusil, Cusil-ABA, and Nicoro, on Mo-46Re and Ta-10W. This work provides trends in wettability to assist in filler metal selection for Mo-Re and Ta-W. The experimental results indicate that some of the suggested filler metals work better for Mo-46Re and not Ta-10W, and vice versa. The Au-based fillers performed slightly better with Mo-46Re and the Cu-based fillers performed slightly better with Ta-10W. |