Sol-Gel synthesis and characterization of SiC–B4C nano powder. Issue 5 (1st March 2021)

• Record Type: Journal Article
• Authors: Najafi, Abolhassan; Golestani-Fard, F.; Rezaie, H.R.; Saeb, Saviz Parsa
• Is Part Of: Ceramics international. Volume 47:Issue 5(2021)
• Page Start: 6376
• Page End: 6387
• Publication Date: 2021-03-01
• Subjects: Sol-gel -- Synthesis -- Boron carbide -- Silicon carbide -- Nanopowder; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2020.10.218
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: In the present research, SiC–B4 C nano powders were synthesized through sol–gel process in water–solvent–catalyst–dispersant system. In order to evaluate the formation mechanism of the product during sol-gel process, TEM, SEM, DTA/TG, BET, XRD, FTIR and DLS analysis methods were employed. The nanometric size of precursor was controlled by dispersing agents and controlling pH inside the sol. DLS analysis revealed that the particles of the precursor inside the sol were below 10 nm. FTIR results indicated that the (Si–O–B) bonds were formed in the dried gel powder, due to hydrolysis and condensation reactions. DTA analysis confirmed that the synthesis temperature was lower than 1400 °C. XRD results implied the presence of cubic β-SiC and the rhombohedral B4 C phases, which were formed simultaneously in the SiC–B4 C nanopowder. BET analysis indicated a high surface area for the particles of about 171.42 m 2 /g, and that the surfaces of these particles were meso porous. SEM analysis exhibited that SiC– B4 C particle size was in the range of 20–40 nm with homogenous morphology. Ultimately, the TEM/EDS microstructural analysis showed that B4 C and SiC particles were formed simultaneously and uniformly in the final product.