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Nanometer Al contained Ni and the preparing method

A technology of nano-nickel powder and nano-nickel, applied in the direction of coating, etc., can solve the problems of unfavorable combustion, incomplete combustion, low combustion efficiency, etc.

Active Publication Date: 2007-09-26
GUOBIAO BEIJING TESTING & CERTIFICATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, adding spherical aluminum powder, oxidant and combustion accelerant to the solid fuel propellant often causes incomplete combustion, and there is still some active aluminum in the residue after combustion, which is mainly due to the formation of a thin layer of dense oxidized aluminum on the surface of the spherical aluminum powder. The aluminum layer has an adverse effect on combustion, resulting in low combustion efficiency

Method used

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  • Nanometer Al contained Ni and the preparing method
  • Nanometer Al contained Ni and the preparing method
  • Nanometer Al contained Ni and the preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The preparation of nano-nickel clad aluminum powder is carried out according to the following steps:

[0041] (1), 130 grams of nickel sulfate (commercially available, analytically pure, molecular formula NiSO 4 ·6H 2 O) be dissolved in 3 liters of pure water, and add 10 grams of polyvinyl alcohol, stir to make it dissolve, obtain solution I;

[0042] (2) Soak 500 grams (the brand is FLQT3) of spherical aluminum powder (see Figure 3 for its electron microscope image) into 2 liters of sodium hydroxide aqueous solution with a concentration of 0.02 mol / liter; stir for 10 to 30 minutes to remove the surface of the aluminum powder 200 milliliters of aqueous solution containing 15 grams of potassium borohydride and 5 milliliters of hydrazine hydrate are poured into this container again, stir well, obtain solution II;

[0043] (3), solution I was poured into solution II, and continued to stir for 30 minutes to produce a precipitate;

[0044] (4), stop stirring, leave stands...

Embodiment 2

[0048] The chemical composition of the nano-nickel-clad aluminum powder prepared in Example 1 was analyzed.

[0049] Quantitative analysis was carried out by complexometric titration. Weigh 1 gram of nano-nickel-coated aluminum powder with a nickel content of 3wt% and place it in a 250-ml beaker, add 20 milliliters of 1:1 analytically pure HCl aqueous solution, after the nano-nickel-coated aluminum powder dissolves, add pure water to dilute to 200 milliliters. Take 20 ml of the above solution and adjust the pH value to <6. A small amount of ammonium fluoride was added to the solution as an aluminum ion masking agent. Add a few drops of 3% xylenol orange aqueous solution as indicator. Titrate the nickel in this solution with 0.05M EDTA (ethylenediaminetetraacetic acid) standard solution. The end point of the reaction changed from reddish purple to yellow. The nickel content in the solution can be calculated. The results show that the weight ratio of nickel in the nano-nick...

Embodiment 3

[0051] The nano-nickel-coated aluminum powder prepared in Example 1 was detected by transmission electron microscopy according to the usual method, and the results showed that the thickness of the nano-nickel layer was 120 nanometers (see Figure 2), indicating that a layer of nano-nickel was coated on the surface of the spherical aluminum powder.

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Abstract

The invention discloses a nanometer nickel-coated aluminum powder and the preparing method. On the surface of ball aluminum powder a layer of nanometer nickel is coated. The preparing method is that nickel salt and aluminum powder are stock; borohydride and hydrazine hydrate are used as reducing agent; the water solution of nickel salt is poured into the container of ball aluminum powder with water solution of reducing agent; it is not mixed rapidly until when the water solution of nickel salt becomes colorless the nanometer nickel-coated aluminum powder is generated. When the mixing is stopped, after the nanometer nickel-coated aluminum powder is sunk to the bottom rapidly, residual nanometer nickel powder on the upper of water solution is abandoned. After it is washed by water in many times and it is set statically, upper clearing solution is abandoned. Finally as it is filtered and it is dried in flow argon atmosphere, the nanometer nickel-coated aluminum powder with good dispersion is prepared. The invention is provided with high burning efficiency and large releasing energy. The preparing method is provided with simple producing process and easy operation. It can be produced in a large scale and the thickness of nanometer nickel layer can be controlled.

Description

technical field [0001] The invention relates to a nano-nickel-coated aluminum powder and a preparation method thereof. Background technique [0002] Spherical aluminum powder is widely used in metallurgy, chemical industry, fuel, explosives, deoxidizer, pesticide, etc. Spherical aluminum powder is widely used as energetic fuel in solid fuel propellants. However, adding spherical aluminum powder, oxidant and combustion accelerant to the solid fuel propellant often causes incomplete combustion, and there is still some active aluminum in the residue after combustion, which is mainly due to the formation of a thin layer of dense oxidized aluminum on the surface of the spherical aluminum powder. The aluminum layer has a detrimental effect on combustion, resulting in low combustion efficiency. [0003] Nano-nickel powder refers to nickel powder with particle size less than 100 nanometers. The particle size of nano-nickel powder is small, its specific surface is large, and its c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02
Inventor 高愈尊
Owner GUOBIAO BEIJING TESTING & CERTIFICATION CO LTD
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