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Synthesis and characterization of h-boron nitride by urea routes
Poster Presentation
Authors
Faculty of Material & Manufacturing Technologies, Malek Ashtar University of Technology, Tehran, Iran
Abstract
Boron nitride has many interesting and useful properties and therefore its use today is greatly expanded. Among the most important of these properties are high thermal conductivity, low thermal expansion, good thermal shock resistance, high electrical resistance, low dielectric constant, microwave transparency, non-toxicity, easy machining, lubrication, chemical stability and melt resistance of various metals. Due to the application and importance of boron nitride nanostructures in the electrical and electronic industries, automotive, oil and gas, optoelectronics, and semiconductors, choosing or developing an appropriate method for synthesizing these materials has become of great importance. In this study, the synthesis and characterization of hexagonal boron nitride powder with reduction of boric acid by urea were investigated. The selection criterion of the method was low economic cost and low production time. Boric acid and urea were used as raw materials with different ratios (1: 3, 1: 5, and 1: 7). The raw materials were dried after milling and heat-treated at 1200 ° C for three and five hours in a nitrogen atmosphere. Samples were oxidized at 850 ° C for 2 h to remove impurities. Acidifying was also used to remove residual impurities. The obtained powder characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). The results proved the successful synthesis of white boron nitride powder with alpha hexagonal structure and average particle size of submicron.
Keywords