Advantages of a Wet Process for the Production of Ti Matrix Composite Reinforced with Carbon Nano Materials by Powder Metallurgy Route

摘要

A titanium matrix composite reinforced with different carbon nano materials i.e. carbon nanotubes, acetylene black and carbon black was fabricated by spark plasma sintering (SPS) and hot extrusion. Carbon nano materials were added for the in-situ formation of TiC fine dispersoids during the SPS process. Fine Ti powders were coated with carbon materials by a wet process using a zwitterionic solution containing 0.5wt.% of carbon materials. The coated Ti powders were consolidated by hot extrusion. The mechanical properties of the composites were remarkably improved by adding a small amount of carbon nano materials. The increases in the yield stress of the extruded fine Ti was 50.7%, 41.2% and 64.2%, while the tensile strength increases 24.8%, 22.5% and 35.7% for the carbon nanotubes, acetylene black and carbon black reinforcement, respectively, compared to those of extruded pure Ti with no reinforcement. The advantages of the wet process are discussed in detail.