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‎ 20.1001.1.17353351.1402.0.0.4.0

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Investigating the effect of temperature and time on the synthesis of mesoporous TiC nanoparticles by sol-gel method
Abolhassan Najafi * , Gholamreza Khalaj
Saveh Branch, Islamic Azad University , ab_najafi@iust.ac.ir
Abstract:   (528 Views)
In this research, titanium carbide nano-powder and nano-whiskers were synthesized using phenolic resin and titanium alkoxide as precursors through sol-gel process. The synthesis process was carried out in the four-way system of alkoxide-catalyst-dispersant-water. The results showed that it is possible to synthesize precursor particles inside the cell in sizes less than 10 nm by controlling pH and adding ammonium polycarboxylate (APC) as a dispersant. DTA analysis showed that primary TiC nucleats grow and crystallize at temperatures around 1200°C through carbothermal reduction reactions of precursor particles containing Ti and C, as well as initial TiC nucleats grow and crystallize at temperatures around 1400°C. XRD patterns were used to confirm the presence of TiC phase in preferential diffraction planes at 1400 °C. The size of the synthesized powder crystals showed that time and temperature control lead to the synthesis of particles with very fine crystals (less than 10 nm). FTIR studies show Ti-C bonds, so that the final product is mainly related to the formation of TiC. Surface studies show the specific surface area of TiC particles at 150 m2/g. The surfaces of these particles are porous and the size of these holes is in the meso range. The morphology of TiC powders is spherical, also the synthesized powders are polycrystalline and according to the microstructure images of the synthesized powder, its average size is very small in nanometer dimensions. Microstructural images showed that with the passage of time, TiC whiskers sprouted heterogeneously from the surface of the particles and grew during the storage period of 3 hours.
Keywords: Nanopowder, Nanowhisker, Mesopore, Sol-gel process, TiC
     
Type of Study: Research | Subject: New Methods of Processing and Fabrication of Ceramics
Received: 2023/11/20 | Accepted: 2024/01/23
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