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Al-Na compound fuel and preparation method and application thereof

A composite fuel and mixture technology, applied in offensive equipment, explosives processing equipment, compressed gas generation and other directions, can solve the problems of reducing the surrounding gas flow rate, incomplete combustion of aluminum powder, low melting point of aluminum powder, etc., to improve combustion performance, Low cost, lower ignition point effect

Inactive Publication Date: 2018-12-25
HUBEI INST OF AEROSPACE CHEMOTECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, aluminum powder also has certain disadvantages as a metal fuel for solid missiles. The main performance is that the melting point of aluminum powder is low and the ignition point is high. Incomplete combustion of aluminum powder
The large condensed phase flows in the rocket engine, which will reduce the flow velocity of the surrounding gas and form the two-phase flow loss of the rocket engine, which will cause the aluminum powder energy to lose more than 10% compared with the theoretical calculation value

Method used

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  • Al-Na compound fuel and preparation method and application thereof
  • Al-Na compound fuel and preparation method and application thereof
  • Al-Na compound fuel and preparation method and application thereof

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preparation example Construction

[0051] A preparation method of Al-NaF composite fuel, the steps of the method comprising:

[0052] (1) Al powder and NaF are carried out high-energy ball milling, obtain mixture;

[0053] (2) after ball milling, passivating agent is used to passivate the mixture obtained in step (1);

[0054] (3) Take out the passivated product, dry it in the air, dry it, and sieve it to obtain the Al-NaF composite fuel.

[0055] In the described step (1), with the total mass of Al powder and NaF being 100%, the mass content of NaF is 1%-10%; Al powder is micron-sized particles or submillimeter-sized particles, and NaF is micron-sized particles ; Use a planetary ball mill for ball milling; the ball-to-material ratio (mass ratio) in the ball mill tank is 6-20:1 when ball milling, the ball refers to stainless steel balls, and the material refers to the mixture of Al powder and NaF; Protected by inert gas; the speed of ball milling is 250-400 rpm, the ball milling method is straight ball millin...

Embodiment 1

[0082] Add 36 grams of 20-50 μm aluminum powder and 4 grams of NaF into a 250ml stainless steel ball mill, then add 320 grams of stainless steel balls to the ball mill, fill the ball mill with a cover and fill it with nitrogen, and fix it in a planetary high-energy ball mill. Set the process parameters: the speed is 300 rpm, the working time is 8 hours, the ball milling method is ball milling for 5 minutes, stop for 30 seconds, and turn on the ball mill for high-energy ball milling.

[0083] After the ball milling, open the cover in the glove box and cool to room temperature, then transfer the ball-milled composite aluminum powder to a 500ml beaker, add about 150ml cyclohexane and stir well. Transfer the beaker to a fume hood and place it until the cyclohexane slowly volatilizes completely to obtain a solid powder. Dry the solid powder in an oven, and then sieve it with a 150 μm sieve to obtain 38.5 grams of sieved material, which is micro-sodium structure Al -NaF (NaF content...

Embodiment 2

[0093] Add 38.8 grams of 300-500 μm aluminum powder and 1.2 grams of NaF into a 250ml stainless steel ball mill jar, add about 400 grams of stainless steel balls to the ball mill jar, fill the ball mill jar with a cover and fill it with nitrogen, and fix it in a planetary high-energy ball mill. Set the process parameters: the speed is 400 rpm, the working time is 12 hours, and the ball milling mode is continuous operation. Turn on the ball mill for high-energy ball milling.

[0094] After ball milling, open the cover in the glove box and cool to room temperature, then transfer the ball-milled composite fuel to a 500ml beaker, add about 200ml of n-hexane and stir well. Transfer the beaker to a fume hood until the n-hexane volatilizes slowly and completely. After the solid powder was dried, it was sieved with a 200um aperture sieve, and the obtained 38.7g of undersieve was micro-sodium structure Al-NaF (NaF content 3%) composite fuel.

[0095] The micro-sodium structure Al-NaF...

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Abstract

The invention relates to Al-Na compound fuel and a preparation method and application thereof and belongs to the technical field of propellant preparation. The preparation method includes: micron-sized Al powder and NaF are added into the ball milling tank of a planetary ball mill according to a certain proportion, the weight of stainless steel grinding balls is determined according to ratio of grinding media to material, certain rotation speed is kept to perform ball milling under inert gas protection, the ball milling tank is opened in a glove box to add an inert stabilizing solvent after the ball milling is completed, the solvent is allowed to slowly volatilize in room-temperature air to complete the natural passivation of fuel, drying in a drying oven is performed after the solvent isvolatilized and dried to obtain solid, namely the Al-Na compound fuel. The micro-nano-structure Al-NaF compound fuel is used to replace aluminum powder to perform a propellant forming test to obtain apropellant containing the micro-nano-structure Al-NaF compound fuel.

Description

technical field [0001] The invention relates to an Al-NaF composite fuel and its preparation method and application, belonging to the technical field of propellant preparation. Background technique [0002] The main components of modern composite solid propellants usually include binders, plasticizers, high-energy additives, oxidizers, metal fuels, curing agents, and other functional additives. The main function of the metal fuel is to increase the combustion heat of the propellant. In theory, Be, Mg, Al, B, Li and other metals are all excellent metal fuels, but Be is too toxic, B is difficult to burn, and Mg has a low ignition point but relatively low calorific value. In terms of comprehensive performance, due to the advantages of high density, low oxygen consumption and high combustion enthalpy, Al has a significant effect on improving the specific impulse of solid propellants. In addition, because of its abundant raw materials and low cost, Al is widely used as a metal f...

Claims

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Application Information

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IPC IPC(8): C06D5/06C06B33/06C06B33/12C06B23/00C06B21/00
CPCC06B21/0058C06B23/005C06B33/06C06B33/12C06D5/06
Inventor 张思朱朝阳邱贤平余凯伦孙忠祥哈恒欣陈克海
Owner HUBEI INST OF AEROSPACE CHEMOTECHNOLOGY
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