Boron powder is a kind of metal fuel with high gravimetric and volumetric calorific values, which has been widely used in military fields such as solid propellants, high-energy explosives, and pyrotechnics. However, the easily formed liquid oxide layer can adhere to the surface of boron powder and react with the hydroxyl (-OH) group of hydroxyl-terminated polybutadiene (HTPB) binder to form a gel layer that is detrimental to propellant processing and restricts the complete oxidation of boron powder. Therefore, to improve the combustion efficiency of boron powder, the ignition and combustion mechanisms of boron powder have been studied, and surface coating modification strategies have been developed by researchers worldwide, aiming to optimize the surface properties, improve the reaction activity, and promote the energy release of boron powder. This review discusses recent studies on the ignition and combustion mechanisms of boron powder. Moreover, the reported boron powder coating materials are classified according to the chemical structure and reaction mechanism. The mechanisms and characteristics of different coating materials are also summarized, and the mechanism diagrams of fluoride and metal oxide are provided.
Furthermore, promising directions for modification methods and the potential application prospects of boron powder are also proposed. Hexagonal boron nitride powder is a material that shows excellent thermal conductivity, heat and corrosion resistance, electric insulation, and lubrication/demolding performance and is used as an additive to various matrixes. Also, the BN coating agent is used as heat-resistant demolding material for various types of metal/glass by using its corrosion resistance and demolding characteristics. If you are looking for high quality, high purity, and cost-effective Boron powder, or if you require the latest price of Boron powder, please feel free to email contact mis-asia.
