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| 1 | Preparation of HMX/TATB spherical composite explosive by droplet microfluidic technology显示文摘Polymer bonded explosives(PBXs)have high energy density,excellent mechanical properties and better thermal stability.In this study,droplet microfluidic technology was used to successfully prepare HMX/TATB microspheres.The effects of different binder types and binder concentrations on the morphology of the microspheres were studied,and results proved that NC/GAP(1:4)provides particles a regular spherical morphology and good dispersion.Subsequently,the influence of the concentration of the dispersed phase and the flow rate of the continuous phase on the particle size distribution of the microspheres was fully studied.The microspheres had narrow particle size distribution and high spherical shape.Under optimized process conditions,HMX/TATB microspheres were prepared and compared with the physical mixtures.The X-ray diffraction,differential scanning calorimetry,flow properties,bulk density,and mechanical sensitivity of the samples were also studied.Results showed that the crystal form of the microspheres remains unchanged,and the binder maintains good compatibility with explosives.In addition,the fluidity,bulk density,real density and safety performance of the microspheres are remarkably better than the physical mixture.This study provides a new method for preparing PBX with narrow particle size distribution,high spherical shape,excellent dispersion and high bulk density. | Bidong Wu Jinqiang Zhou Yunyan Guo Rui Zhu Dong Wang Chongwei An Jingyu Wang | 2023 | Defence Technology(防务技术)2023，21，3： | 3 |
| 2 | RDX crystals with high sphericity prepared by resonance acoustic mixing assisted solvent etching technology显示文摘In order to obtain high-quality spherical RDX crystal particles,the RDX crystals were suspended in a mixed solvent of cyclohexanone and cyclohexane,subsequently a solvent etching study was carried out under the action of vibration/acoustic flow coupled flow field,which generated by resonance acoustic mixing.The effects of solvent ratio,temperature,acceleration and experiment time on morphology as well as particle size of RDX crystals were studied.Not only were the morphology,particle size distribution and crystal form of RDX crystals determined,but also the thermal decomposition performance and mechanical sensitivity of spherical RDX were examined and discussed.Results indicated that under the process of solvent/non-solvent volume ratio at 1:2,temperature of 40℃,acceleration of 40 g and experiment time of 4 h,α-type RDX crystal with sphericity of 0.92 can be obtained.Furthermore,the median particle size(D_(50))of spherical RDX crystals is 215.8 μm with a unimodal particle size distribution(size span 1.34).For one thing,the thermal decomposition peak temperature of spherical RDX is about 2.5℃ higher than that of raw RDX,and apparent activation energy reaches 444.68 kJ/mol.For another thing,impact sensitivity and friction sensitivity of spherical RDX are 18.18% and 33.33% lower than that of raw RDX,respectively.It demonstrates that safety of spherical RDX under thermal,impact and friction stimuli has been improved. | Dongjie Liao Qian Liu Chunyan Li Ning Liu Mingchang Wang Chongwei An | 2023 | Defence Technology(防务技术)2023，28，10： | 1 |
| 3 | Depend- ence of particle morphology and size on the mechanical sensitivity and thermal stability of oetahydro-1,3,5,7- tetranitro-1,3,5,7-tetrazocine 显示文摘 | Song Xiaolan Wang Yi An Chongwei | 2008 | Journal of Hazard- ous Materials2008，159，23： | 1 |
| 4 | Dependence of particle morphology and size on the mechanical sensitivity and thermal stability of octahydro- 1,3,5,7-tetranitro 1,3,5,7-tetrazocine 显示文摘 | Song Xiaolan Wang Yi An Chongwei | 2008 | Journal of Hazardous Materials2008，159，： | 1 |
| 5 | Dependence of particle morphology and size on the mechanical sensitivity and thermal stability of octahydro-1, 3, 5, 7-tetranitro-1, 3, 5, 7-tetrazocine显示文摘 | SONG Xiaolan WANG Yi AN Chongwei | 2008 | Journal of Hazardous Materials2008，159，23： | 1 |
| 6 | Preparation and properties of HMX coated with a composite of TNT/energetic material显示文摘 | An Chongwei Wang Jingyu Xu Wenzheng | 2010 | Pro- pellants Explosives Pyrotechnics2010，35，4： | 1 |
| 7 | Surface coating of RDX with a composite of TNT and an energetic-polymer and its safety investigation显示文摘 | An Chongwei Li Fengsheng Song Xiaolan | 2009 | Propellants Explosives Pyro- technics2009，34，： | 1 |
| 8 | Study on rheological properties of CL-20/HTPB casting explo- sive显示文摘 | Li Haixing Wang Jingyu An Chongwei | 2014 | Central European Journal of Energetic Mate- rials2014，11，2： | 1 |
| 9 | Prepamfion and Performan- ces of Castable HTPB/CL-20 Booster Explosives显示文摘 | Jingyu Wang Chongwei an Gangli | 2011 | PropeUa- nts Explosives Pyrotechnics2011，2011，36： | 1 |
| 10 | Study on rheological properties of CL-20/HTPB casting explosive显示文摘 | Jingyu Wang Haixing li Chongwei an | 2014 | Central European Journal of Energetic Materials2014，11，2： | 1 |
| 11 | Process and performance of DAAF microspheres prepared by continuous integration from synthesis to spherical coating based on microfluidic system显示文摘In order to improve the energy output consistency of 3, 3’-diamino-4, 4’-azoxyfurazan(DAAF) in the new insensitive booster and the safety and efficiency in the preparation process, a continuous preparation system of DAAF from synthesis to spherical coating was designed and established in this paper, which combined ultrasonic micromixing reaction with microdroplet globular template. In the rapid micromixing stage, the microfluidic mixing technology with ultrasonic was used to synergistically strengthen the uniform and rapid mass transfer mixing reaction between raw materials to ensure the uniformity of DAAF particle nucleation-growth, and to prepare high-quality DAAF crystals with uniform structure and morphology and concentrated particle size distribution. In the microdroplet globular template stage, the microfluidic droplet technology was used to form a droplet globular template with uniform size under the shear action of the continuous phase of the dispersed phase solution containing DAAF particles and binder. The size of the droplet template was controlled by adjusting the flow rate ratio between the continuous phase and the dispersed phase. In the droplet globular template, with the diffusion of the solvent in the dispersed phase droplets, the binder precipitates to coat the DAAF into a ball, forming a DAAF microsphere with high sphericity, narrow particle size distribution and good monodispersity. The problem of discontinuity and DAAF particle suspension in the process was solved, and the coating theory under this process was studied. DAAF was coated with different binder formulations of fluororubber(F2604), nitrocellulose(NC) and NC/glycidyl azide polymer(GAP), and the process verification and evaluation of the system were carried out. The balling effects of large, medium and small droplet templates under different binder formulations were studied. The scanning electron microscope(SEM) results show that the three droplet templates under the three binder formulations exhibit good balling effect and narrow particle size distribution. The DAAF microspheres were characterized by powder X-ray diffraction(XRD), differential scanning calorimetry(DSC), thermo-gravimetric(TG) and sensitivity analyzer. The results showed that the crystal structure of DAAF did not change during the process, and the prepared DAAF microspheres had lower decomposition temperature and lower mechanical sensitivity than raw DAAF. The results of detonation parameters show that the coating of DAAF by using the above three binder formulations will not greatly reduce the energy output of DAAF, and has comparable detonation performance to raw DAAF. This study proves an efficient and safe continuous system from synthesis to spherical coating modification of explosives, which provides a new way for the continuous, safe and efficient preparation of spherical explosives. | Bidong Wu Jiahui Shi Mengsen Wei Rui Zhu Yi Liu Jinqiang Zhou Chongwei An Jingyu Wang | 2024 | Defence Technology(防务技术)2024，32，2： | 0 |
| 12 | Morphology prediction of dihydroxylammonium 5,5'-bistetrazole-1,1'-diolate (TKX-50) crystal in different solvent systems using modified attachment energy model显示文摘In order to theoretically study the growth morphology of dihydroxylammonium 5,5’-bistetrazole-1,1’-dio late(TKX-50)crystal in different solvent systems,crystal–solvent models were established,and then molecular dynamics(MD)methods were adopted as a means to simulate particle motion.Modified attachment energy(MAE)model was employed to calculate the growth morphology of TKX-50.The simulation results demonstrate that COMPASS force field and RESP charge are suitable for molecular dynamics simulation of TKX-50.The morphologically dominant growth surfaces of TKX-50 in vacuum are(020),(011),(11–1),(100)and(120),respectively.In water(H_(2)O)and N,N-dimethylformamide(DMF)solvents,the(11–1)face is the largest in the habit face,the growth rate of(020)face becomes faster.With the increase of temperature,the aspect ratios of TKX-50 crystal in DMF solvent increase,and the areas of the(120)faces decrease.In ethylene glycol/H_(2)O mixed solvent system with volume ratio of 1/1,aspect ratio of TKX-50 is relatively small.In formic acid/H_(2)O mixed solvents with different volume ratios(1/4,1/3,1/2,1/1 and 2/1),aspect ratio of TKX-50 is relatively small when volume ratio is 1/2. | Fang Chen Tao Zhou Lijie Li Chongwei An Jun Li Duanlin Cao Jianlong Wang | 2023 | Chinese Journal of Chemical Engineering2023，53，1： | 0 |
| 13 | Crystal phase control and ignition properties of HNS/CL-20 composite microspheres prepared by microfluidics combined with emulsification techniques显示文摘Improved controllability and energy density of ignition agents are of great significance for the devel-opment of energetic composite materials.In this study,droplet microfluidics and emulsification tech-niques were combined to prepare HNS/CL-20 composite microspheres with polyglycidyl azide polymer(GAP)as the binder.The influence of binder content on the morphology of microspheres was investi-gated,and the microspheres were characterized and tested for particle size,crystal structure,thermal decomposition,dispersibility,mechanical sensitivity,combustion behavior and detonation performance.The results showed that microspheres prepared with a binder content of 3%had higher sphericity and particle size uniformity.The microspheres retained the crystal structure of both HNS and CL-20(ε-type).Compared with raw HNS,the microspheres had higher apparent activation energy,better safety per-formance,and good dispersibility.The ignition experiments and detonation performance tests show that HNS/CL-20 composite microspheres have excellent ignition performance,obvious combustion flame,and significant energy release effects,which are expected to achieve high energy and high-speed response of the igniter,thus improving the ignition reliability in special environments or systems. | Yi Liu Yunyan Guo Rui Zhu Jinqiang Zhou Zhengxu Lin Kai Han Chongwei An Jingyu Wang Bidong Wu | 2024 | Particuology2024，85，2： | 0 |
| 14 | Preparation of HNS microspheres by rapid membrane emulsification显示文摘In order to improve the dispersibility and loading efficiency of 2,2',4,4',6,6'-hexanitrostilbene(HNS),HNS microspheres were prepared by rapid membrane emulsification method with nitrocellulose(NC)as binder.The effects of NC solution concentration,stirring speed and polyvinyl alcohol(PVA)solution concentration on microspheres were investigated.It was characterized by scanning electron microscope(SEM),X-ray diffractometer(XRD),differential thermal analysis(DTA)and angle of repose analyzer.The results show that the HNS microspheres prepared with 5 wt%NC solution concentration,stirring speed of 100 rpm and 2 wt%PVA solution concentration have better regular morphology,higher sphericity,unchanged crystalline shape,increased activation energy and significantly improved dispersibility compared with the refined HNS.Rapid membrane emulsification has a series of advantages such as green,low cost and easy scale up,which provides a better way to prepare microspheres of energy materials. | Hongbiao Huo Baoyun Ye Yuhuai Shi Chenhe Feng Jiechao Wang Minjie Li Jiake Fan Lianqiang Li Jingyu Wang Chongwei An | 2023 | Particuology2023，，8： | 0 |
| 15 | One-step rapid preparation of CL-20/TNT co-crystal assembly and spheroidized coating based on droplet microfluidic technology显示文摘Energetic materials pose challenges in preparation and handling due to their contradictory properties of high-energy and low-sensitivity.The emergence of co-crystal explosives is a new opportunity to change this situation.If the co-crystal explosive is coated into spherical particles with uniform particle size distribution,this contradiction can be further reduced.Therefore,binder-coated hexanitrohexaazaisowurtzitane/2,4,6-trinitrotoluene(CL-20/TNT)co-crystal microspheres were prepared by droplet microfluidic technology in this work.The coating effects of different binder formulations of nitrocellulose(NC)and NC/fluorine rubber(F2604)on the co-crystal spheres were studied.The scanning electron microscopy(SEM)results showed that the use of droplet microfluidic technology with the above binders can provide co-crystal microspheres with regular spherical morphology,uniform particle size distribution and good dispersion.X-ray diffraction(XRD),fourier-transform infrared(FT-IR),differential scanning calorimetry(DSC)and thermo-gravimetric(TG)methods were employed to compare the properties of the co-crystal microspheres,raw material and pure co-crystal.The formation of CL-20/TNT co-crystal in the microspheres was confirmed,and the co-crystal microspheres exhibited better thermal stability than the raw material and pure co-crystal.In addition,the mechanical sensitivity and combustion performance of the co-crystal microspheres were further studied.The results showed that the co-crystal microspheres were more insensitive than CL-20 and pure co-crystal,and displayed excellent self-sustained combustion performance and theoretical detonation performance.This study provides a new method for the fast,simple and one-step preparation of CL-20/TNT co-crystal microspheres,with binder coating,uniform particle size distribution,and excellent performance level. | Jiahui Shi Bidong Wu Jinqiang Zhou Dawei Ren Dongxu Zhang Chongwei An Jingyu Wang | 2023 | Defence Technology(防务技术)2023，27，9： | 0 |
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