In order to improve the recovery of ammonium perchlorate (AP) components in scrapped HTPB solid propellants, the AP in HTPB solid propellants were extracted by water/ethanol mixed solvent system. The effects of extraction time, extraction temperature, volume ratio of water/ethanol, ratio of liquid to material, thickness of sample and extraction rate on AP extraction rate were discussed. The extraction results were characterized by scanning electron microscopy (SEM). The results showed that the best process parameter for extracting AP components from HTPB solid propellants: the extraction temperature was 70°C, the extraction time was 6h, the volume ratio of water/ethanol was 1:1, the ratio of liquid to material was 6:1(water/ethanol volume and sample mass ratio, ml/g) and the extraction frequency was 2 times. Under this condition, the recovery of AP was 90.5% and the purity of AP was 91.1%.
Glass flake has excellent capacity of anti-infiltration, for perfecting the bonding of resin and glass flake, Using butyl titanate as the main material, the glass flake/TiO2 composite particle doped by Sn4+ at low temperature was prepared. SEM observation indicated that TiO2 particles covered the glass flake powder surface and form nanometer/micron structure. XRD showed TiO2 particle was amorphous, the particle size was very small or just formed halfcrystal. Acidity effected the growth speed of crystal and structure of growth elementary. SnCl4 could form heterogeneous crystal to lead the TiO2 film formation.
In connection with the weldability of dissimilar material between pure copper and 1Cr17Ni2 stainless steel and the low joint strength and quality stability,analyses on the factors which affect the quality of the welding are conducted,including the strcutural design of welded joint,welding material,technology parameters,manipulating skills.Rational structure and welding parameters are determined,technological test and qualification of welding procedure are conducted and mechanical property of welded joint,metallography and microstructure were observed and analyzed.
The exothermic behavior of propellant and propellant with core-shell particle has been monitored by DSC technique in dynamic heating conditions at four heating rates (β). And it was compared with that of propellant alone. Based on the comparison of experimental results, the decomposition peak temperature and apparent activation energy of propellant and propellant with core-shell particle was calculated. The results show that with the increase of heating rate, the decomposition peak temperature of propellant and propellant with core-shell particle shifted to the right. According to the calculated result of decomposition peak temperature and apparent activation energy, it can be seen that the core-shell particle had good compatibility with propellant.
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