Aluminum hydride surface coating modification method

Abstract

The invention discloses an aluminum hydride surface coating modification method. A metal oxide or a metal substance with a nanometer thickness is deposited on the aluminum hydride powder surface to clad the aluminum hydride powder surface by adopting an atomic layer deposition technology, so as to improve the heat stability of the aluminum hydride powder. The method comprises the following steps: S1, putting aluminum hydride powder into a cavity and vacuumizing; S2, introducing a fluidized gas after the cavity is heated to the set temperature and the temperature is even and stable, so that aluminum hydride is pre-dispersed; S3, atomic layer deposition reaction, carrying out the atomic layer deposition reaction when the temperature inside the cavity achieves 50-130 DEG C; S4, repeating the atomic layer deposition reaction for a plurality of times, so that the powder surface deposition thickness is continuously increased, and controlling the thickness of the metal oxide or the metal deposited on the surface of the aluminum hydride powder by controlling the circulating times of the deposition reaction. Thus, a cladding layer of which the cladding thickness is 1-1,000nm is cladded on the surface of the aluminum hydride powder, so as to achieve stabilization of powder.

Description

technical field [0001] The invention belongs to the field of energetic materials, and more specifically relates to a method for modifying the surface of aluminum trihydride to stabilize it. Background technique [0002] Aluminum hydride is considered to have the potential to become the main energetic material in a new generation of solid rocket propellants due to its high combustion heat, theoretical specific impulse, low density, and environmental friendliness. According to different synthesis conditions, aluminum trihydride has crystalline phases such as α, α', β, and γ, among which the α phase is the most stable, and other phases will transform into α phase at about 100°C. α-AlH3 has extremely high mechanical sensitivity and is prone to explosion, which poses a great safety hazard in the process of propellant pharmaceuticals, transportation and storage. [0003] Since the first preparation of pure phase α-aluminum hydride in the 1970s, it has been accompanied by the rese...

AI Technical Summary

Problems solved by technology

[0006] In view of the above defects or improvement needs of the prior art, the present invention provides a method for coating and modifying the surface of aluminum hydride, which uses atomic deposition technology to coat a layer of metal oxide with a thickness of nanometer or submicron on the surface of aluminum hydride Or metal, to stabilize it, thereby solving the problem of insufficient thermal stability of aluminum hydride, easy decomposition and explosion, or the problem of hydrogen content reduction caused by other surface modification methods

Images