Cheng J.,Nanjing University of Science and Technology |
Zhang R.-X.,Jiangsu University |
Fu D.-X.,Sichuan Petroleum Perforating Materials Co. |
Zhao F.-Q.,Xi'an Modern Chemistry Research Institute |
And 3 more authors.
Hanneng Cailiao/Chinese Journal of Energetic Materials | Year: 2015
An energetic Pb(II) complex (Pb(TANPyO)) of 2,4,6-triamino-3,5-dinitropyridine-1-oxide (TANPyO) was synthesized. The structure and properties were characterized by FT-IR spectroscopy, elemental analysis, TG-DTG and DSC, and the impact sensitivity, friction sensitivity and shock wave sensitivity were studied as well. The catalytic effect of Pb (TANPyO) on the thermal decomposition of ammonium perchlorate (AP) was analyzed by TG-DTG and DSC. Results show that the molecular formula of Pb (TANPyO) is Pb(C5H4N6O5). The impact sensitivity, friction sensitivity and shock wave sensitivity are 305 cm, 36 kg and 4.9 mm, respectively. Pb(TANPyO) has an exothermic peak with summit peak at 329.0℃ in the temperature range of 50-500℃ with 23.8% residues. Its apparent activation energy of exothermic decomposition reaction is 331.9 kJ·mol-1. The Pb(TANPyO) has significant catalytic effect on the thermal decomposition of AP. © 2015, Editorial Board of CHINESE JOURNAL OF ENGINEERING MATERIAL. All right reserved.
Li R.,Huazhong University of Science and Technology |
Shi Y.,Huazhong University of Science and Technology |
Liu J.,Heilongjiang Institute of Science and Technology |
Xie Z.,Sichuan Petroleum Perforating Materials Ltd |
Wang Z.,Huazhong University of Science and Technology
International Journal of Advanced Manufacturing Technology | Year: 2010
Tungsten-Copper (W-Cu) alloys are promising materials for electrical and thermal applications. However, its forming method still remains limited in conventional powder metallurgy technique which is not suitable for manufacturing parts with intricate shapes. In this work, selective laser melting technology was introduced for fabricating W-10 wt.% Cu alloys parts. The morphological feature of a single molten track was analyzed. The results show that liquid phase sintering with complete melting of the binder (Cu), but nonmelting of the structural metal (W), acts as the main mechanism in this process. The melting conditions of single layers in different processing parameters were investigated. The results show that a moderate melting zone can be acquired from an established process map. Moreover, investigations on multilayers forming show that the final density increases with the decrease of scan speed until it reaches a plateau due to the insufficient rearrangement in liquid phase sintering and the balling effect. © 2009 Springer-Verlag London Limited.
Chen F.,Chongqing University |
Jiang D.-Y.,Chongqing University |
Xie Z.,Sichuan Petroleum Perforating Materials Ltd. Co. |
Li R.-D.,Huazhong University of Science and Technology
Fenmo Yejin Cailiao Kexue yu Gongcheng/Materials Science and Engineering of Powder Metallurgy | Year: 2010
Using polyhedrons' tungsten powder and electrolytic copper powder as raw material, the skeleton of the shaped charge liner was prepared via laser sintering, and followed by infiltrating with copper at 1150°C and H2 atmosphere to achieve the W-Cu perforating bomb's shaped charge liner. And then XRD, SEM and so on were utilized for analyzing and characterzing. The results show that the shaped charge liner skeleton with density distributing homogeneously are produced by laser sintering. The density of laser sintered W-Cu alloy could not reach to full densification due to the limited liquid copper content in W-Cu composite powder without pressing exerted on the powder. However, the densification has increased to full density by the followed combinative infiltrating. By using theis technique, W-Cu shaped charge liner exhibits uniform density from the top to bottom compared with conventional mould pressing sample. Moreover, the target practice of the perferative bomb made of laser sintering-infiltratration technology shows that the prepared perforating bomb possesses on average penetration depth of 964 mm, which is 52% higher than that of the conventional mould pressing sample.
Li R.D.,Huazhong University of Science and Technology |
Liu J.H.,Heilongjiang Institute of Science and Technology |
Shi Y.S.,Huazhong University of Science and Technology |
Zhang L.,Central South University |
Du M.Z.,Sichuan Petroleum Perforating Materials Ltd
Powder Metallurgy | Year: 2010
90W-7Ni-3Fe parts were fabricated via selective laser melting. The influences of processing parameters on the densification and microstructure were highlighted in this work. The compositions and microstructures of as produced alloys were investigated through X-ray diffraction, energy dispersive X-ray spectroscopy and SEM respectively. It is found that the phase structures are not evidently influenced by processing parameters. The density, surface characteristic and microstructure of final parts are dependent on processing parameters. Decreasing the scan speed is able to eliminate balling effect, diminish surface roughness, induce more melted W particles and yield better densification. Narrowing the scan interval is capable of creating a better bonding condition between scan tracks, obtaining a lower surface roughness and improved density. Decreasing the powder layer thickness is favourable for the layers bonding, leading to a higher densification. © 2010 Maney Publishing.