Preparation method of iron-clad aluminum type composite powder and product thereof

Abstract

The invention discloses a preparation method of iron-clad aluminum type composite powder. The method comprises the following steps of: (a) adding micron aluminum powder to a fluidized bed and introducing a carrier gas, thereby performing a fluidization process of aluminum powder; (b) continuously introducing the carrier gas to empty air in the fluidized bed, and heating the fluidized bed so as to reach a predetermined temperature; and (c) adding carbonyl iron to a bubbler and heating to volatile carbonyl iron to be brought into the fluidized bed by the carrier gas to generate a vapor deposition reaction, thereby producing an iron-clad aluminum composite powder product. The invention further discloses the corresponding composite powder product and use of the composite powder product. Through the invention, the iron-clad aluminum type composite powder can be prepared without requiring a solvent, later separating and drying steps are saved, the prepared product has a uniform and dense coating layer, excellent thermal properties and good heat release concentration, and is especially applicable to the uses of the aspects in processing energetic materials, laser surface cladding and the like.

Description

technical field [0001] The invention belongs to the field of metal composite powder preparation, and more specifically relates to a method for preparing iron-clad aluminum composite powder and its products. Background technique [0002] Due to its high heat of combustion, ultra-fine aluminum powder is widely used in the field of energetic materials such as solid rocket propellants and high-energy explosives. However, micron-sized aluminum powder has slow combustion kinetics, long ignition delay, and incomplete combustion, so its potential high calorific value cannot be fully utilized. Studies have shown that the coating treatment of micron aluminum powder can effectively improve its combustion performance and increase the utilization rate of "effective aluminum". Among them, the improvement of thermal performance of micron aluminum powder coated with metal is particularly prominent. This is mainly because the metal-coated micron aluminum powder can prevent further oxidation...

AI Technical Summary

Problems solved by technology

Among them, the defect of the electroplating method is that the processing equipment is relatively complicated, difficult to control, and the manufacturing cost is high; although the electroless plating method is relatively simple in process, because aluminum is an amphoteric metal, it is unstable in acidic or alkaline plating solutions, and it is easy to cause plating problems. The decomposition of the liquid, correspondingly provides the difficulty of quality control in the preparation process to a large extent; for the chemical liquid deposition method, although it can achieve iron coating without corroding the original aluminum powder, the coating The uniformity of the Fe / Al composite powder is not good, and there is free Fe in the prepared Fe / Al composite powder

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