A Facile Continuous Production of Hexagonal Boron Nitride Powders

Abstract

An intermediate-frequency furnace was used for continuous production of hexagonal boron nitride (h-BN) by heating a mixture of C3N6H6 and H3BO3 in a flowing nitrogen gas at 1800–1950 °C. The products were examined by XRD, Raman, FTIR, and SEM. The results indicate the as-synthesized products are h-BN flakes with a purity of 98.73 wt %. A possible reaction mechanism is discussed.

Mechanism of Hierarchical Porosity Development in Hexagonal Boron Nitride Nanocrystalline Microstructures for Biomedical and Industrial Applications

“…This synthetic procedure typically utilizes boric acid and melamine as reactants, relying solely on the reduction of boron by oxidation of an organic material as a source of nitrogen. During these reactions, flue gases such as NO x and CO x are generated in an inert atmosphere. , These reactions have been reported and described earlier by several researchers. ,− Other research has demonstrated the formation of melamine diborate (M2B), which occurs as a result of hydrogen bonding between melamine and boric acid . Under thermal treatment, the produced crystalline material forms the precursor of h-BN, (B 4 N 3 O 2 H), which is then converted to h-BN under high temperatures under inert atmospheres.…”

“…In one of the most feasible methods of synthesis, boric acid and melamine are exposed to high temperatures in an inert atmosphere . This method is one of the safest because, unlike other techniques where ammonia and hydrogen gases are used, this one employs only nonhazardous gases.…”

“…In one of the most feasible methods of synthesis, boric acid and melamine are exposed to high temperatures in an inert atmosphere. 32 This method is one of the safest because, unlike other techniques where ammonia and hydrogen gases are used, 33 this one employs only nonhazardous gases. This synthetic procedure typically utilizes boric acid and melamine as reactants, 34 relying solely on the reduction of boron by oxidation of an organic material as a source of nitrogen.…”

Magnetic Nanostructured White Graphene for Oil Spill and Water Cleaning

“…42 The preparation method via reduction of melamine diborate (M2B) is considered the safest one as high pressure and flammable or toxic gases such as hydrogen or ammonia are not needed. 43 h-BN can take different nanoscale morphologies depending on the applied synthesis method and the conditions used during preparation. 44 Different h-BN nanostructures have been reported by other researchers, such as nanotubes, 45 nanosheets, 46 nanomeshes, 48 nanoscrolls, 47 nanoflower-shaped materials, 48 and nanoribbons which have similar characteristics to graphene.…”

“…All of those methods are similar in that they use high temperatures (up to 1873 K) and high pressures (up to 5 GPa) . The preparation method via reduction of melamine diborate (M2B) is considered the safest one as high pressure and flammable or toxic gases such as hydrogen or ammonia are not needed . h-BN can take different nanoscale morphologies depending on the applied synthesis method and the conditions used during preparation .…”