Silver - Based infiltrated composites

Abstract

Attempts have been made to describe the influence of production process parameters on the microstructure and properties of W - Ag and Mo - Ag composites. W-30%Ag, W-40%Ag, Mo-30% Ag and Mo-40%Ag composites were produced by tumbling W5%Ag and Mo-5%Ag mixtures for 30 minutes in the Turbula T2F mixer. The powders were subsequently cold pressed inarigid die onasingle action press. The pressure was adjusted individually to assure 25% and 35% green porosity. Prior to infiltration the compacts were sintered in hydrogen at 1100°C for one hour. The porous skeletons were finally contact infiltrated with Ag-1%Ni alloy at 1100 and 1200°C for one hour in hydrogen. The main objective of this work was to compare properties and microstructure of the as-infiltrated composites.