Aluminum hydride surface coating modification method

A technology of aluminum trihydride and surface coating, applied in gaseous chemical plating, metal material coating process, coating and other directions, can solve the problems of decreased hydrogen content, explosion, easy decomposition, etc., and achieve the effect of improving stability

Active Publication Date: 2014-09-17
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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  • Aluminum hydride surface coating modification method
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  • Aluminum hydride surface coating modification method

Examples

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Embodiment 1

[0037]In this embodiment, the atomic deposition technology is used to coat the surface of the aluminum hydride powder with aluminum oxide having a thickness of 300 cycles (about 42nm), and the surface is coated and modified. The method includes the following steps:

[0038] S1: Weigh 0.05 grams of aluminum trihydride, spread it on the stainless steel filter of the powder holder, then put the powder holder into the atomic layer deposition reaction chamber, close the lid, start vacuuming, and the outlet of the chamber The pressure is 1Pa.

[0039] S2: Heating the cavity, the temperature inside the cavity is set at 50°C, during the heating process, nitrogen fluidizing gas is injected at 50 standard milliliters per minute to fully fluidize the powder, and the cavity outlet pressure is about 40Pa.

[0040] S3: After waiting for the temperature in the chamber to stabilize at 50°C, start the atomic layer deposition reaction. During the entire atomic layer deposition reaction process,...

Embodiment 2

[0050] The process of this embodiment is similar to that of Example 1, except that the quality of aluminum hydride, the temperature in the cavity, the flow rate of fluidization gas, the flow rate of carrier gas, the reaction time of aluminum hydride with the first precursor and the second precursor, etc. The key reaction parameters are different, and the cleaning time of the carrier gas is different. The specific differences are:

[0051] S1: different from step S1 in Example 1, the quality of aluminum trihydride is 2.50 grams;

[0052] S2: The difference from step S2 in Example 1 is that the temperature in the chamber is set to 90°C, and nitrogen gas is introduced at 300 standard milliliters per minute to fully fluidize the powder, and the outlet pressure of the chamber is about 300Pa;

[0053] S3: Different from step S3 in Example 1, the flow rate of the carrier gas is 75 standard milliliters per minute, the flow rate of the fluidizing gas is 100 standard milliliters per min...

Embodiment 3

[0063] The process of this embodiment is similar to that of Example 1, except that the quality of aluminum hydride, the temperature in the cavity, the flow rate of fluidization gas, the flow rate of carrier gas, the reaction time of aluminum hydride with the first precursor and the second precursor, etc. The key reaction parameters are different, and the cleaning time of the carrier gas is different. The specific differences are:

[0064] S1: different from step S1 in Example 1, the quality of aluminum trihydride is 5.00 grams;

[0065] S2: The difference from step S2 in Example 1 is that the temperature in the cavity is set to 130°C, and nitrogen gas is injected at 500 standard milliliters per minute to fully fluidize the powder, and the cavity outlet pressure is about 500Pa;

[0066] S3: Different from step S3 in Example 1, the flow rate of the carrier gas is 100 standard milliliters per minute, the flow rate of the fluidizing gas is 400 standard milliliters per minute, the ...

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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...

Claims

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Application Information

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IPC IPC(8): C23C16/455
Inventor 陈蓉刘潇单斌段晨龙王永庆文艳伟曾大文唐根
Owner HUAZHONG UNIV OF SCI & TECH
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