Microstructure and properties of W-Ag matrix composites by designed dual-metal-layer coated powders

Abstract

In this study, W-Ag matrix composites were fabricated by a relatively low temperature (750 °C) via designing dual-metal-layer (Cu and Ag) coated W powders. The effects of Cu and Ag coated W powders on the densification, microstructure and properties of the composites were investigated. The results indicated that the Cu-Ag coating promotes the sintering process and favors the low-temperature densification of W-Ag matrix composites. Moreover, the Cu-Ag coating benefited the formation of Cu-Ag solution and improved the interfacial bonding. The hardness of W-Ag matrix composites was increased to 260.0 HV by adjusting the composition of the material, and compressive strength can reach 799 MPa. The electrical conductivity can reach 45.0% IACS.

Keywords

• W-Ag matrix composites
• Dual-metal-layer coated powders
• Low-temperature densification
• Microstructure
• Mechanical properties