Composite Titanium Powder Coated with Carbon Black Particles Using Wasted Black Ink and Mechanical Properties of Its Extruded Material

摘要

In this study, the composite titanium (Ti) powder coated with un-bundled carbon black (CB) particles was prepared via a wet process using black ink solution collected from the used ink cartridges of inkjet printing. Un-bundled CB particles were independently and uniformly dispersed in the black ink, and coated on the pure Ti powder surface by dipping the powders into the ink. These composite Ti powders were consolidated as Ti matrix composite (TMC) reinforced with CB particles by spark plasma sintering (SPS) and subsequent hot extrusion. Some of CB particles were dissolved into the Ti matrix as solid solution elements during sintering. In-situ formed titanium carbide (TiC) dispersoids were uniformly distributed in the extruded Ti composites. Carbon solid solution strengthening and TiC dispersion strengthening were effective for improving mechanical properties of the TMC. Consequently, the TMC showed an excellent balance of high tensile strength of 899 MPa and enough elongation of 18.7 % at room temperature.