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Aluminum powder can release a large amount of reaction heat

What is aluminum powder?

As nano-aluminum powder (NAP) can improve the detonation performance of aluminum-containing explosives, more and more explosives with NAP as the metal ingredient have been studied. It is believed that the added nano-sized aluminum powder can significantly enhance the mechanical sensitivity of explosives. However, the mechanism for the enhancement has not been clarified. To illuminate the effects of NAP on the mechanical sensitivity of explosives, two RDX-based aluminum-containing explosives with the same weight ratio and preparation process were investigated despite the aluminum powders with different nano-size and micron-size. The two explosives' morphology and surface atomic ratio were examined by scanning electron microscopy with energy-dispersive spectroscopy tests. Material Studio software calculated the contact angle and other microstructures properties of the explosives. Results revealed that the aluminum particle sizes and explosive components determined the impact and friction activity. This paper clarified the mechanism for the increase in explosives sensitivity by adding NAP, which provides a reference for the scientific and technical design of novel explosives.

 

Aluminum powder can release a large amount of reaction heat

For aluminized explosives, the aluminum powder can release a large amount of reaction heat in the secondary reaction following the detonation wave, which increases the detonation heat and specific volume of the explosive during detonation and also enables the explosive to have a higher work capacity. That is why it is called high-power or high explosive and has become one of the main research categories in the explosives field. In the study of the mechanism of the detonation reaction between aluminum powders and explosives, the secondary reaction theory of aluminum-containing explosives is proposed: the Al powder in the formulation does not participate in the reaction on the wavefront during the detonation. For the energy release reaction on the detonation wave front, Al powder is an inert endothermic substance, which will absorb the released energy by the explosive reaction from the detonation wave front. At the same time, the powder has good thermal conductivity (the thermal conductivity coefficient is 230 W/(m·K−1)). With the rapid expansion of the detonation products, part of the energy on the detonation wavefront is quickly transferred to the air. This will decrease the energy that supports the detonation propagation of explosives, which is macroscopically reflected in the decrease of detonation pressure and detonation velocity of the aluminized explosives with the increase in Al powder content. To improve the aluminized explosives' detonation energy output structure, the Al powder's time to participate in the detonation reaction is advanced.

 

Aluminum powder had a significant effect on the detonation performance

The size of the aluminum powder significantly affected the detonation performance of explosives. Small-sized aluminum powder is more likely to react with explosive detonation products with an advanced reaction time, large reaction volume, and fast energy release, which enhances the work capacity of explosives. Especially the addition of nano-sized aluminum powder can effectively improve the work capacity of explosives. Leonid Kaled et al. studied Alex nano-aluminum particles and their applications in liquid and solid rocket propellants. It is found that the most effective way to achieve complete combustion is the application of aluminum powder with a particle size of at least 1 to 2 orders of magnitude smaller than the one used in conventional solid propellants. Therefore, research on applying nano-aluminum powder in explosives has attracted more and more attention in recent years. Some researchers have systematically studied the characteristics of RDX-based explosives, such as detonation heat, detonation velocity, metal acceleration ability, underwater explosion energy, front curvature effect, etc. Some papers also reported the influence of nano-Al on the sensitivities of cyclo-trimethylene trinitramine (RDX)-based explosives, which clearly showed that adding nano-Al increased the explosive's mechanical sensitivity and flame sensitivity. However, the research in this field is not deep enough. The results just reflected the macroscopic performance of explosives and some basic theories. The role of microstructure on the materials' performance and relevant scientific theory is yet to be clarified. Until now, the mechanism of NAP inducing the increase in the explosives' mechanical sensitivity and flame sensitivity has not been understood. Previous results have not given enough illustration of the improvement and design of nano-Al-containing explosive formulations.

 

Price of aluminum powder

Aluminum powder particle size and purity will affect the product's Price, and the purchase volume can also affect the cost of Aluminum powder. A large amount of large amount will be lower. The Price of aluminum powder is on our company's official website.

 

Aluminum powder supplier

Mis-Asia is a reliable and high-quality global chemical material supplier and manufacturer. It has over 12 years of experience providing ultra-high quality chemicals and nanotechnology materials, including aluminum powder, nitride powder, graphite powder, sulfide powder, and 3D printing powder. If you are looking for high-quality and cost-effective aluminum powder, you are welcome to contact us or inquire any time.

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