Micro-nano structure Al-FeF3 compound fuel and preparation method thereof

Abstract

The invention discloses a micro-nano structure Al-FeF3 compound fuel and a preparation method thereof. The method includes the steps: adding aluminum powder, additives FeF3 and stearic acid into a planetary ball mill, and performing high-energy ball milling according to the ratio of grinding media to materials and process parameters; taking out materials, adding organic solvents, and naturally drying the materials to achieve passivation of the materials; cleaning the materials by the organic solvents, drying the cleaned materials, and packaging the dried materials. In the aspects of a structure and a form, the prepared micro-nano structure Al-FeF3 compound fuel has the advantages that the aluminum powder has a micron-sized form and accounts for 95% or more of the weight of the compound fuel, the additives FeF3 have a nano-sized form and are uniformly embedded into surface layers and the inside of the aluminum powder, the additives FeF3 can serve as metal fuels for solid rocket propellants to replace the aluminum powder, so that an ignition point of the aluminum powder can be reduced, low-temperature oxidation performance of the aluminum powder is improved, and two-phase loss of a rocket nozzle is reduced. A preparation process of the compound fuel is simple, preparation devices are mature, and industrial amplification can be achieved under a certain scale.

Description

technical field [0001] The invention relates to a kind of Al-FeF with micro-sodium structure 3 Composite fuel, specifically related to a method of preparing Al-FeF by utilizing the principle of high energy ball milling 3 Composite fuel and method for its preparation. Background technique [0002] The main components of modern composite solid propellants usually include binders, plasticizers, high-energy additives, oxidizers, metal fuels, curing agents, and other functional additives. The main function of the metal fuel is to increase the combustion heat of the propellant. In theory, Be, Mg, Al, B, Li and other metals are all excellent metal fuels, but Be is too toxic, B is difficult to burn, and Mg has a low ignition point but relatively low calorific value. In terms of comprehensive performance, due to the advantages of high density, low oxygen consumption and high combustion enthalpy, Al has a significant effect on improving the specific impulse of solid propellants. In...

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Problems solved by technology

Analysis of the development status of related technologies at home and abroad shows that the aluminum powder composite fuel with core-shell structure prepared by the coating method has the following disadvantages: First, the selection of different coating layers often requires the use of different coating methods and coating processes , many methods often have higher requirements on equipment and technology; second, many coatings have poor bonding strength with the aluminum powder body, and the shear force of the mixer during the propellant production process causes the coating to fall off; third, the coating Layer thickness and coating content are difficult to precisely control according to formulation requirements

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