Phase Evolution in the Pd-Ag-CuO Air Braze Filler Metal Alloy System

Conference · Tue Aug 01 04:00:00 EDT 2006

OSTI ID:963604

Darsell, Jens T; Weil, K Scott

Palladium was added as a ternary component to a series of copper oxide-silver alloys in an effort to increase the use temperature of these materials for potential ceramic air brazing applications. Phase equilibria in the ternary Pd-Ag-CuO system were investigated via differential scanning calorimetry (DSC) and a series of quenching experiments. Presented here are the latest findings on this system and a construction of the corresponding ternary phase diagram for low-to-moderate additions of palladium. The analysis included samples with higher palladium additions than were studied in the past, as well as an analysis of the composition-temperature trends in the Ag-CuO miscibility gap with palladium addition. It was found that the addition of palladium increases the solidus and liquidus and caused three phase zones to appear as expected by the phase rule. Furthermore, the palladium additions cause the miscibility gap boundary extending from the former binary eutectic to shift to lower silver-to-copper ratios.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 963604
• Report Number(s): PNNL-SA-50588; AA1510100
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALLOY SYSTEMS
ALLOYS
BRAZING
CALORIMETRY
CERAMICS
CONSTRUCTION
COPPER
EUTECTICS
FILLER METALS
PALLADIUM
PALLADIUM ADDITIONS
PHASE DIAGRAMS
PHASE RULE
QUENCHING
SOLUBILITY
air braze alloy
phase analysis
scanning electron microscopy
thermal analysis