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Preparation of TiC nanosheets by molten salt assisted carbon induced decomposition of Ti3AlC2
Received date: 2021-04-26
Online published: 2021-12-16
2D transition metal carbides are very attractive nanomaterials due to their unique properties.Using carbon black and Ti3AlC2 powder as raw materials,it was expected that Ti3AlC2 can be reduced by carbon in a molten salt environment to syn-thesize titanium carbide（TiC） nanosheets.The results showed that carbon black may induce the decomposition of Ti3AlC2 to syn-thesize TiC nanocrystals at low temperature.As the heating temperature increased,the degree of decomposition of Ti3AlC2 was gradually intensified.Ti3AlC2 could be seriously decomposed into Al,Ti,Ti2.9Al2.1 and TiC at low temperature（1 000~1 100 ℃）.Al and Ti could react with trace oxygen to produce a small amount of TiO2 and Al2O3.The generated TiC was nano-particle.The introduction of molten salt was a necessary condition to ensure the formation of TiC nanosheets.By optimizing the preparation process,the most suitable conditions for the synthesis of high content TiC nanosheets were obtained.The molar ra-tio of carbon black to Ti3AlC2 was 1.05∶1,and the mass ratio of NaCl to KCl was 1∶1.The mass ratio of the total salt to the mix-ture of carbon black and Ti3AlC2 was 2∶1.The mixed powders were put into the tubular furnace under the protection of Ar.After holding at 1 000 ℃ for 2 h,the samples with TiC as the main component were obtained by molten salt heat treatment.The morphology of TiC was fine nanosheets with thickness of about 10 nm and length of about 170 nm.
Key words： nanosheets; TiC; carbon black; molten salt synthesis
Yanli ZHANG , Zhen DAI , Dongming NIU , Baoyan LIANG . Preparation of TiC nanosheets by molten salt assisted carbon induced decomposition of Ti3AlC2[J]. Inorganic Chemicals Industry, 2021 , 53(12) : 95 -99 . DOI: 10.19964/j.issn.1006-4990.2021-0076
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