Journal
CERAMICS INTERNATIONAL
Volume 46, Issue 15, Pages 23544-23555Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2020.06.125
Keywords
TiC; Carbon black; UHTC; Spark plasma sintering; Characterization; Densification
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Funding
- Aliyazh Sanat Sahand Ipak Company, Tabriz, Iran [971210-8]
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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 degrees 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 similar to 3200 HV0.1 kg). Finally, the composite specimen presented a lower coefficient of friction (similar to 0.31) on average compared to the undoped TiC (similar to 0.34).
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