Aluminum powder can reducing the mechanical sensitivity
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Author : LZH
Update time : 2023-07-25 18:43:55
What is aluminum powder? Nano-aluminum powder(purity 99.8%) with an average particle size of 100 nm was made by the Xi'an Modern Chemistry Research Institute. Micron-aluminum powder (purity 98.9%) with an average particle size of 20 μm made by Xi'an Aerospace Chemical Propulsion Co., Ltd. RDX with an average particle size of 123.6 μm was produced by Gan-su Yin-Guang Chemical Industry Group Co., Ltd. Paraffin wax with a melting point of 68 °C was produced by Petro China Fu-shun Petrochemical Company. The friction and impact sensitivity instrument (H3.5–10W) was employed to examine the sensitivity of explosives. An FEI QUANTA 600 field emission scanning electron microscope (FE-SEM) that FEI Co. USA manufactured was employed to investigate the explosive morphology. The accelerating voltage was 10 kV, and the tests were conducted in high vacuum mode. N2 adsorption–desorption measurements were carried out at 77 K using a Quantachrome Autosorb gas-sorption system to determine the specific surface area of nano-Al, micro-Al, and RDX separately. The specific surface area of nano-Al, micron-Al, and RDX are 22.22, 0.55, and 0.344 m2/g. The transmission electron microscopy (TEM) nano-Al tests were operated using a Hitachi (H 9000 NAR). The calibrated H3.5–10W drop-hammer impact sensitivity instrument measures the impact sensitivity of explosives. The weight of the drop hammer was 10 kg, and the weight of the explosive was 50 mg. The examination was conducted according to the drop height of each test. The test's 50% explored drop height is believed to be the impact sensitivity. The tests are divided into two groups, each with 25 rounds. The final result is the even value of all the test rounds in each group.
Aluminum powder can reducing the mechanical sensitivity Reducing the mechanical sensitivity of explosives is still a very effective way to improve the intrinsic safety of explosives manufacturing, transportation, storage, and other production links. Research on the influencing factors of the explosives' mechanical sensitivity can guide improving the explosive performance from the aspects of explosive formulation design, material pretreatment, the manufacturing process, etc. To further reveal the influence of NAP on the explosives' mechanical sensitivity, the RDX-based explosives with the same component ratio containing nano-sized and micron-sized aluminum powder were prepared with the same process separately. The surface atomic energy spectra, contact angle, and other properties were examined. Material Studio (MS) software was utilized for modeling the structure and calculating the structure parameters. The correlation between the structure-activity, aluminum powder size, explosive components, and impact-friction sensitivity was clarified. The paper's results provided a scientific reference for the future safety application of nano-aluminum powder in explosives. The friction sensitivity of the explosives is determined by the surface pressure of 3.92 MPa by the swing angle of 90° with the weight of 50 mg. The tests are also divided into two groups, with 25 rounds in each group. The average value of each group is obtained.
The deformation of micron-Al could not ignite RDX The wax has almost no influence on the sensitivity of RDX. Compared to the RDX + paraffin wax, the impact sensitivity of explosive 2, composed of micron-Al, is the lowest of all the materials. This should be attributed to the micron-Al that could not be deformed when explosive two was impacted, and the deformation of micron-Al could not ignite RDX, which eventually decreased the impact sensitivity of explosive 2. On the other hand, the impact sensitivity of explosive 1 is much higher than that of explosive 2, and RDX, accompanied by friction sensitivity, is also much higher than that of explosive 1. This should be attributed to RDX-based explosives' interface and microstructural characteristics with nano-Al. As the surface area of nano-Al is much larger than that of RDX particles, more paraffin wax is coated on the surface of nano-Al, meaning that the amount of RDX particles in explosive one are coated with less paraffin wax. To explosive 2, with the same amount of paraffin wax, micron-Al is more uniformly attached on the surface of RDX particles. Under the impact of the drop hammer, RDX is lubricated and buffered by micron-Al, resulting in the two explosives' different impact sensitivity. To friction sensitivity, explosive one is higher than explosive 2, which should be caused by nano-Al. The nano-Al has a higher specific surface area than micron-Al, which is easier to be ignited by friction. Compared with RDX and RDX + paraffin wax, the friction sensitivity of explosive 1 is higher than that of RDX + paraffin wax and RDX, which should be caused by the adsorption of paraffin wax between nano-Al and RDX.
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.
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