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Yan K.,Zhejiang University | Zhang Y.-W.,Zhejiang University | Wang Y.-C.,The 718 Research Institute of CSIC | Liu J.-Z.,Zhejiang University | And 2 more authors.
Guti Huojian Jishu/Journal of Solid Rocket Technology | Year: 2013

The lithium perchlorate decomposition process under N2 atmosphere by five different heating rates was analyzed with TG-DSC simultaneous thermal analysis in the temperature range of room temperature to 900°C. Kinetic mechanism of lithium perchlorate decomposition was analyzed by both mass-change rate and energy performance of the chemical reaction process. αTG and αDSC were obtained from TG and DSC data, respectively. It was found that in the same heating-rate αDSC lags behind αTG and the delay increases with the increase in heating-rate. The decomposition process was divided into two-step consecutive reaction which should be fitted with two different mechanism function by single-scan rate method. The multi-scan rate method Friedman was applied to obtaining two sets of activation energies calculated from TG and DSC data respectively.


Ma Y.-L.,The 718 Research Institute of CSIC | Chen X.-M.,The 718 Research Institute of CSIC | Huang Q.,The 718 Research Institute of CSIC
Xiandai Huagong/Modern Chemical Industry | Year: 2015

To solve the problem of invariable ratio of anion and cation resin for high-tower separation and transportation, the ways of changing the output order and resetting endoscopy and anion resin export position are proposed. The variable ratio of disable anion and cation resin can be separated and transported. The flow rate control and matching are also analyzed in resin transfer process. The best selection is given based on the experiments. ©, 2015, China National Chemical Information Center. All right reserved.


Zheng L.-J.,The 718 Research Institute of CSIC | Jiang Y.-X.,The 718 Research Institute of CSIC | Li J.,The 718 Research Institute of CSIC | Tang J.-K.,The 718 Research Institute of CSIC
Xiandai Huagong/Modern Chemical Industry | Year: 2015

The effects of ball/material ratio and milling time on the self-corrosion hydrogen evolution from the aluminum super-corroding alloy prepared by mechanical alloying are studied. The self-corrosion hydrogen evolution of the aluminum based quaternary super-corrosion alloy is determined with the self-made device. The obtained super-corrosion alloy exhibits good self-corrosion hydrogen evolution property when the ball/material ratio and milling time are 5:1 and 60 hours, respectively. Under this condition, the alloy has the fastest hydrogen evolution reaction speed and achieves the maximum corrosion hydrogen evolution quickly in the shortest time. ©, 2015, China National Chemical Information Center. All right reserved.


Liu T.,The 718 Research Institute of CSIC | Wang S.-B.,The 718 Research Institute of CSIC | Wang Z.-W.,The 718 Research Institute of CSIC
Xiandai Huagong/Modern Chemical Industry | Year: 2011

Perfluoro-2-methyl-3-pentanone is the complete fluoride substitute of 2-methyl-3-pentanone, which has the property of preventing burning and has wide application in protecting molten magnesium and extinguishing agents. The main synthetic methods of perfluoro-2-methyl-3-pentanone are introduced and the advantages and disadvantages of above synthetic methods are analyzed. The reaction of pentafluoropropionyl fluoride and hexafluoropropylene is feasible in actual production, and the synthetic method of pentafluoropropionyl fluoride is introduced. The application of perfluoro-2-methyl-3-pentanone in protecting molten magnesium is introduced in detail, and the application of perfluoro-2-methyl-3-pentanone as extinguishing agents and cleaning compositions is briefly introduced. Application experiment indicates that perfluoro-2-methyl-3-pentanone has outstanding flame-retardant effect and has no impact on environment. At last, the development of perfluoro-2-methyl-3-pentanone is prospected.


Wu F.-C.,The 718 Research Institute of CSIC | Wang S.-B.,The 718 Research Institute of CSIC | Song F.-C.,The 718 Research Institute of CSIC | Yang X.-K.,The 718 Research Institute of CSIC
Xiandai Huagong/Modern Chemical Industry | Year: 2014

The purification process for trifluoromethanesulfonic anhydride is studied. Most of trifluoromethanesulfonic acid (CF3SO3H) can be removed by adding a suitable amount of phosphorus pentoxide. Subsequently, batch vacuum distillation is used to further remove the impurities. The results show that the content of CF3SO3H can be reduced to less than 0.5% via the reaction of CF3SO3H and P2O5. After vacuum batch distillation, the purity of trifluoromethanesulfonic anhydride can reach 99.5%. And the yield of trifluoromethanesulfonic anhydride is 70%.


Peng X.-G.,The 718 Research institute of CSIC | Tian Y.-M.,The 718 Research institute of CSIC | Bai L.,The 718 Research institute of CSIC | Fu G.,The 718 Research institute of CSIC
Hedianzixue Yu Tance Jishu/Nuclear Electronics and Detection Technology | Year: 2012

The paper introduces a new full-spectrum lithology density data acquisition system. It is capable to collect full spectrum data during well logging. This data acquisition system can generate a complete spectrogram, and provide more stratum information to satisfy users' needs. The logging tool is mainly based on field programmable logic device (FPGA), which is practical for data collecting and processing. The pulse conditioning circuit is designed to ensure the accuracy of detection. In order to ensure real-time data transmission, the dual port RAM is applied with the use of the high-speed AD, which is applicable for data quantizing. This new full-spectrum lithology density data acquisition system can be widely used in well logging industry because the spectrogram is accurate and the system operation is stable after simulation experiments in Modelsim and board testing.


Zhan H.-A.,The 718 Research Institute of CSIC | Zheng H.-Y.,The 718 Research Institute of CSIC | Zhao W.-Z.,The 718 Research Institute of CSIC | Wang Y.-C.,The 718 Research Institute of CSIC
Guti Huojian Jishu/Journal of Solid Rocket Technology | Year: 2010

The influence of four kinds of fillers on the mechanical properties, processing properties and ablation properties of RTV-2 silicone rubber used in inhibitor were studied. The results show that the fumed silica was the best reinforcing filler. There is an improvement of 3~4 times of tensile strength with the addition of sericite powder or hollow glass microspheres, but the general requirement of inhibitor can't be satisfied. The viscosity of rubber increases with increasing of fillers. The fumed silica must be treated before use, for its severe influence on viscosity, and other fillers can be used freely. All of these fillers can improve the anti-ablation of the material. The mass ablation rate and linear ablation rate of the RTV-2 silicone rubber are less than 0.050 g/s and 0.050 mm/s respectively, which means a reduction of over 60% and 80%, compared to that of a specified inhibitor of HTPB. These properties tend to satisfy technology need of some solid propellent inhibitor.


Fu Y.-J.,The 718 Research Institute of CSIC | Hao L.-C.,The 718 Research Institute of CSIC | Su H.,The 718 Research Institute of CSIC | Zhang G.-H.,The 718 Research Institute of CSIC | Hao R.-J.,The 718 Research Institute of CSIC
Gongcheng Lixue/Engineering Mechanics | Year: 2013

To learn more about the noise in the oscillation inside a cloud of bubbles, the nonlinear dynamics of a spherical cloud of bubbles have been simulated numerically with Lagrangian finite volume method. The simulations employ the fully nonlinear continuum bubbly mixture equations coupled with the Rayleigh-Plesset equation for the dynamics of bubbles. The impacts of initial bubble radius, void fraction and cloud radius on the noise are investigated by comparing the simulation results. The results show that the frequency of noise decreases with the increasing initial void fraction, cloud radius, and the noise intensity increases. The influence of initial bubble radius on the frequency of noise is minor, but the intensity decrease with it.

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