Spark plasma sintering of TiN ceramics codoped with SiC and CNT |
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| Authors: | Seyed Ali Delbari Behzad Nayebi Ehsan Ghasali Mohammadreza Shokouhimehr Mehdi Shahedi Asl |
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| Affiliation: | 1. Department of Mechanical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran;2. Ceramic Dept., Materials and Energy Research Center, Alborz, Iran;3. Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul 08826, Republic of Korea |
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| Abstract: | In this research, we investigated the effects of SiC and multi-walled carbon nanotube (MWCNTs) addition on the densification and microstructure of titanium nitride (TiN) ceramics. Four samples including monolithic TiN, TiN-5?wt% MWCNTs, TiN-20?vol% SiC and TiN-20?vol% SiC-5?wt% MWCNTs were prepared by spark plasma sintering at 1900?°C for 7?min under 40?MPa pressure. X-ray powder diffraction patterns and scanning electron microscope (SEM) micrographs of the prepared ceramics showed that no new phase was formed during the sintering process. The highest calculated relative density was related to the TiN ceramic doped with 20?vol% SiC, while the sample doped with 5?wt% MWCNTs presented the lowest density. In addition, the SEM investigations revealed that the addition of sintering aids e.g. SiC and MWCNTs leads to a finer microstructure ceramic. These additives generally remain within the spaces among the TiN particles and prohibit extensive grain growth in the fabricated ceramics. |
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| Keywords: | Carbon nanotube Microstructure Spark plasma sintering Silicon carbide Titanium nitride |
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