Processing of Alumina Reinforced Copper Metal Matrix Composite by Selective Laser Melting Technology

Abstract

For the development of the additive technologies it is necessary to expand the range of the used materials. One of the most promising directions is the creation of products from composite materials. In this work copper-alumina composite powder was prepared by ball milling, and used in selective laser melting, to produce a composite material. The raw powder materials consisted of the gas atomized Cu powder (with the regular spherical shape and mean particle diameter of 32 μm) and alumina powder, produced by condensation of vapor on electrostatic filter (average particle size is about 220 nm). The alumina weight ratio was 5%. Four 30x10x6 mm copper-alumina specimens were manufactured. The scanning electron microscopy was used for the analysis of composite microstructure. Obtained copper-alumina composite material has higher hardness, in comparison with cast copper (HRB is 60 and 45, respectively).

Laser Additive Manufacturing of Oxide Dispersion-Strengthened Copper–Chromium–Niobium Alloys

“…Additive manufacturing processes offer near-net-shape fabrication of complex structures in addition to extremely high solidification conditions. While additive manufacturing of ODS steels using laser-based [50] or electron beam-based [51] additive manufacturing processes have already been demonstrated, additive manufacturing of oxide dispersionstrengthened copper alloys only in singular studies [52][53][54] typically results in highly porous structures [52]. This may be attributed to difficult processing of copper and its alloys, due to its low absorption for near-infrared wavelengths [55] and high specific thermal conductivity leading to unstable melt pool behavior [56], frequently resulting in high porosities [57][58][59][60][61] lack of fusion [57,59,62,63] and oxide formation [64] in printed copper components.…”