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Surface plasma treatment equipment uses low-temperature plasma technology to modify the surface of ultra-fine AP powder:
Ammonium perchlorate is a commonly used oxidant in composite solid propellants, modified double-base propellants and nitrate plasticized polyether (NEPE) propellants. It has the advantages of high oxygen content, high enthalpy of formation, and high thermal stability. At present, in order to increase the burning rate of propellants, ultrafine ammonium perchlorate has been widely used in propellants.
But as the particle size becomes smaller and the specific surface area increases, the ultrafine AP powder has strong hygroscopicity and is easy to agglomerate into lumps, which seriously affects its use effect in propellants. Using nitrocellulose (NC) to coat AP, the hygroscopicity of modified superfine AP decreases, which effectively solves the agglomeration of superfine AP. Using composite modifiers to modify the ultrafine AP, the modifier has a good anti-caking effect and has industrial application prospects.
The AP/PS/FAS composite film is obtained by coating ammonium perchlorate with polystyrene (PS) and dodecafluoroheptyltrimethoxysilane (FAS), which reduces the moisture absorption of AP. The above methods have in common that AP is coated and modified, but a large amount of coating agent may reduce the ability of the propellant, thereby affecting its use. Therefore, it is particularly important to find a new method for surface treatment of AP.
Surface plasma treatment equipment Low-temperature plasma technology to treat the powder can introduce active groups or form a protective film on the surface of the powder, thereby improving powder dispersion, compatibility, and mechanical properties. The technology has the advantages of simple process, high efficiency, strong continuity, no solvent, and low environmental pollution.
The low-temperature plasma technology performs surface treatment on the ultra-fine AP powder to reduce its moisture absorption performance, improve agglomeration and agglomeration, and obtain ultra-fine AP powder with good dispersibility. After using the surface plasma treatment equipment low temperature plasma technology to treat the ultrafine AP particles, the agglomeration phenomenon is improved. This is because during the discharge process, some large particles formed by agglomeration are broken up, and at the same time, the AP particles are charged with the same charge, and the particles repel each other, thereby dispersing the AP particles.
The hygroscopicity of ultra-fine AP after treatment is significantly lower than that of ultra-fine AP before treatment. This is because in the process of applying low-temperature plasma technology to treat ultra-fine AP, some nitrogen-containing groups and nitrogen-containing compounds are formed to cover the surface of ultra-fine AP powder by ionization, forming a water-repellent layer to prevent water from entering; it may also be due to ultra-fine AP. After the fine AP is processed, the surface energy decreases and the ability to absorb moisture decreases, which leads to the decrease of the hygroscopicity of the ultra-fine AP after the treatment.
After the surface plasma treatment equipment low-temperature plasma technology treats the ultrafine AP powder, the hygroscopicity of the ultrafine AP powder is significantly reduced, the agglomeration phenomenon is significantly improved, and the dispersibility becomes better. After the treatment, the structural properties and purity of the ultrafine AP powder did not change significantly. At the same time, the impact sensitivity of the ultrafine AP powder decreased by 7.1% and the friction sensitivity decreased by 6% after treatment.
Surface plasma treatment equipment Low temperature plasma technology to treat ultra-fine AP powder has a very good effect on improving its agglomeration and agglomeration. It provides a new way for similar surface treatment of energetic powder materials, which has certain reference and reference significance.
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