Method for preparing core-shell structure functional coating nano aluminium-nickel powder

Abstract

A preparing method of core-casing structure function coating nano aluminum-nickel powder comprises: using aluminum powder with a granule size of 60-100 nanometer as core, using nickel acetylacetonate as coating agent; adding nanometer aluminium powder into glycol dimethyl ether liquid, dispersing them evenly by mixing; adding nickel acetylacetonate into glycol dimethyl ether liquid, dissolving them completely by mixing to form homogeneously mixed liquid; mixing above two liquids, making the nickel acetylacetonate to absorpt spontaneously on nanometer aluminium powder in glycol dimethyl ether liquid; naturally volatilizing and drying the nanometer aluminium powder after completing absorption and then taking it out, and core-casing structure function coating nano aluminum-nickel powder is produced. The advantages of the invention are: function coating nano aluminum-nickel powder has good heat-releasing feature and thermostability, nickel and aluminum absorb with each other effectively while activity is retained so that the aluminum powder coated by metal nickel is effective; the reaction condition is controlled easily, operation thereof is convenient and easily, and the raw material is sufficient.

Description

(1) Technical field [0001] The invention relates to a method for preparing functionally coated nano-scale metal powder, in particular to a method for preparing functionally coated nano-aluminum-nickel powder with a core-shell structure. (2) Background technology [0002] In 1899, the Germans first proposed to add aluminum powder to explosives to improve the working ability of explosives, and obtained a patent in 1900. Since then, explosives containing aluminum powder have gradually developed and have become an important series of military mixed explosives. It is widely used in the fields of air-to-air weapons and ammunition, underwater weapons and ammunition, ship-to-ship weapons and ammunition, and air-to-ground weapons and ammunition. In order to improve the energy characteristics of fuel propellants such as missiles and rockets, metal powder is usually added to the propellant, and aluminum powder is the most widely used. Aluminum powder is selected because of its high hea...

AI Technical Summary

Problems solved by technology

The reason for the incomplete combustion of the nano-aluminum powder is that the aluminum powder has a thick oxide layer covering the surface of the particles, which will reduce the combustion rate and particle temperature during the combustion process, so that the combustion process will be terminated prematurely. If the particle size of the nano-aluminum powder Controlled within the range of 60-100 nanometers, it can maximize the complete combustion before the oxide layer prevents oxygen from diffusing to the core; if the aluminum powder particles are too fine, they will be oxidized too much before combustion, when the aluminum powder particles are smaller than 50 nanometers At this time, the weight ratio of the oxide coating layer to the entire aluminum powder particle will reach 60%. Since the oxide coating layer is a porous structure, after the surface layer of the aluminum powder particle is completely oxidized, the aluminum powder will be continuously oxidized as the exposure time prolongs. Oxidation can even lead to complete loss of reactivity of aluminum powder particles