Beneficial role of carbon black on the properties of TiC ceramics

• Published in: Ceramics international Vol. 46; no. 15; pp. 23544 - 23555
• Main Authors: Nguyen, Van-Huy, Pazhouhanfar, Yaghoub, Delbari, Seyed Ali, Shaddel, Shahrzad, Babapoor, Aziz, Mohammadpourderakhshi, Yasaman, Le, Quyet Van, Shokouhimehr, Mohammadreza, Shahedi Asl, Mehdi, Sabahi Namini, Abbas
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 15.10.2020
• Subjects: Carbon black; Characterization; Densification; Spark plasma sintering; TiC; UHTC; Characterization; Spark plasma sintering; Carbon black; Densification; UHTC; TiC
• ISSN: 0272-8842; 1873-3956
• DOI: 10.1016/j.ceramint.2020.06.125

This investigation aimed to study the influence of carbon black on the qualifications of TiC-based materials. For this objective, two samples, namely monolithic TiC and TiC-5 wt% carbon black were sintered by spark plasma sintering (SPS) method at 1900 °C. X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM) were used to characterize the as-sintered samples. Introducing carbon black enhanced the relative density of TiC significantly, reaching a near fully dense substance. Phase analysis and microstructural studies manifested the formation of non-stoichiometric TiCx in both ceramics. Although the introduction of carbonaceous additive considerably increased the thermal conductivity and flexural strength of TiC, standing at 25.1 W/mK and 658 MPa, respectively, its influence on the Vickers hardness was trivial (both ~ 3200 HV0.1 kg). Finally, the composite specimen presented a lower coefficient of friction (~ 0.31) on average compared to the undoped TiC (~ 0.34).