The reinforcement mechanisms of graphene oxide in laser-directed energy deposition fabricated metal and ceramic matrix composites: a comparison study

Carbon-based nanomaterials mainly including carbon nanotubes (CNTs), graphene, and graphene oxide (GO) have superior properties of low density, outstanding strength, high hardness. Compared with ceramic reinforcements, small amount carbon-based can significantly improve the mechanical metal matrix composites (MMCs) (CMCs). However, CNTs graphite always aggregate or degrade during fabrication a temperature, especially in MMCs. GO has advantages easier to be dispersed other materials better high-temperature stability. Laser-directed energy deposition (DED) been used fabricate GO-MMCs GO-CMCs due unique capabilities coating, remanufacturing, producing functionally graded materials. Laser DED, as fusion manufacturing process, could fully melt material powders, which refine microstructure increase density properties. react at temperatures. The survival, degradation, reactions laser DED fabricated are still unknown. There is also no investigation on reinforcement mechanisms process. In this study, GO-reinforced Ti (GO-Ti) zirconia toughened alumina (GO-ZTA) parts were by Raman spectrum, XRD analysis, EDS analysis applied investigate forms both GO-CMCs. microhardness compressive MMCs CMCs analyzed.