Morphological analysis and high-temperature phase stability of spark plasma sintered TiN-MWCNTs ceramic composite

Abstract The microstructure, mechanical properties, and phase stability of TiN+MWCNTs ceramic-based composite were studied. Ball milling spark plasma sintering (SPS) techniques adopted for synthesizing titanium nitride (TiN) composites containing 1, 3, 5 wt. percent (wt. %) multiwalled carbon nanotubes (MWCNT). At a temperature 1000 °C where the was investigated, effects MWCNT addition on thermal treatment characteristics fabricated explored. According to results, resultant effect ball ad-milled powders at 1800 played critical role in homogenous diffusion MWCNTs into TiN ceramic matrix. It further noted that different % nanotube helped stabilizing FCC-crystal phases this elevated temperature. A slight transformation observed microstructures, as core outer rim remained stable their crystallographic orientation. varying retained α-FCC both during after exposure 3 h. with 1wt. content exhibited highest hardness 40 GPa fracture toughness 12.22 MPa m 1/2 , while least value 12.5 recorded by unreinforced sample. alloying significantly enhanced strengthening toughening composites.