Shanghai Aerospace Equipment Manufacture

Shanghai, China

Shanghai Aerospace Equipment Manufacture

Shanghai, China
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Zhou H.,Nanjing University of Science and Technology | Guo R.,Nanjing University of Science and Technology | Nan B.,Shanghai Aerospace Equipment Manufacture | Liu R.,Nanjing University of Science and Technology
Guofang Keji Daxue Xuebao/Journal of National University of Defense Technology | Year: 2017

Based on the demand of the spacecraft protection against the orbital debris, numerical simulation of a new designed stuffed corrugation-cored sandwich under hypervelocity impact was carried out. The hypervelocity impact process was obtained, and thereby the perforation of the sandwich and the characteristics of the debris cloud were analyzed. It can be seen that the phenomenon of stuffed corrugation-cored sandwich under hypervelocity impact is similar to that of Whipple structure, but the head velocity of the debris cloud is lower and the expansion velocity and expansion angle is larger. With the impact velocity increasing from 3 km/s to 10 km/s, the size of the sandwich perforation increases accordingly and the shape of the perforation becomes more irregular. Furthermore, the epoxy stuffed in the sandwich absorbs most impact energy of the debris while the front plate and the corrugation core absorb less energy. The research can provide some references for the design of orbital debris shield. © 2017, NUDT Press. All right reserved.


Su P.-B.,Shanghai Aerospace Equipment Manufacture | Wu X.-H.,Harbin Institute of Technology | Jiang Z.-H.,Harbin Institute of Technology | Yao Z.-P.,Harbin Institute of Technology
Corrosion and Protection | Year: 2014

The galvanic corrosion behavior between carbon fiber composite material and LY12 aluminum alloy was studied in NaCl solution. The results indicate that there was serious galvanic corrosion when the two kinds of materials were coupled in NaCl solution. The galvanic current was evidently affected by environmental temperature, electrolyte concentration and pH of electrolyte. As the coupled time increased, the galvanic current became lower. However, the galvanic current increased in the beginning then reduced lightly; finally it kept an upper levll in the acid and alkaline solutions. The galvanic corrosion current was the least in the neutral solution. The surface of corrosive LY12 aluminum alloy had obvious pit corrosion hole, the region of corrosion became much more flat.


Yao Z.,Harbin Institute of Technology | Xia Q.,Harbin Institute of Technology | Shen Q.,Harbin Institute of Technology | Ju P.,Shanghai Aerospace Equipment Manufacture | And 3 more authors.
Solar Energy Materials and Solar Cells | Year: 2015

In order to reduce the effects of solar energy on the instruments and the apparatus in the outer space, two different kinds of ceramic coatings were prepared on Ti6Al4V alloys by plasma electrolytic oxidation (PEO) in zirconate electrolytes. The phase composition, microstructure, thickness, and roughness of coatings were examined by XRD, SEM, EDS, thickness measurement gauge, and roughness measuring instrument, respectively. The infrared emissivity and solar absorbance of the ceramic coatings were studied with the UV-vis-NIR spectrophotometer and infrared reflectometer. The results show that ZrO2 coatings are dense and deep gray-green, and mainly composed of m-ZrO2, t-ZrO2. In addition, a small amount of TiO2, ZrTiO4, and the amorphous compound containing P exists in the coating. The intrinsic solar absorbance and emissivity of ZrO2 coatings are 0.92 and 0.76, respectively. The KZr2(PO4)3 coating is rough, thick, and white with the main crystalline of KZr2(PO4)3. The intrinsic solar absorbance and emissivity of the KZr2(PO4)3 coating are 0.62 and 0.91, respectively. For both coatings, the absorbance decreases while the emissivity increases due to an increase in the real surface area of the coatings by increasing thickness and roughness of the coatings as the PEO time progresses. The porous structure of the KZr2(PO4)3 is proved to be ideal for high emissivity and low absorbance materials with the lowest solar absorbance (0.239), the highest infrared emissivity (0.99), and a corresponding balance temperature of the coating of 276 K. © 2015 Elsevier B.V. All rights reserved.


Yao Z.,Harbin Institute of Technology | Su P.,Shanghai Aerospace Equipment Manufacture | Shen Q.,Harbin Institute of Technology | Ju P.,Shanghai Aerospace Equipment Manufacture | And 3 more authors.
Surface and Coatings Technology | Year: 2015

Ceramic coatings with high emission and low absorptance were prepared on Ti6Al4V alloy by plasma electrolytic oxidation (PEO) in zirconate electrolyte. The effects of current density and working frequency on the structure and thermal control properties of the coatings were investigated. The phase composition, microstructure, thickness and roughness of coatings were examined by XRD, SEM, EDS, thickness measurement gauge and roughness measuring instrument, respectively. Thermal control properties of the coatings were studied with a UV-VIS-NIR spectrophotometer and an infrared reflectometer. The results show that the coatings are porous and composed of a large amount of KZr2(PO4)3, and a little monoclinic ZrO2, tetragonal ZrO2 and ZrP2O7 as well. The thickness of the coatings increases with the increase of the current density or the decrease of the working frequency while the roughness of the coatings increases with the increase of the current density and the working frequency. The increase of current density reduces the absorptance, but improves the emissivity; the increase of working frequency improves the absorptance, but does not change emissivity apparently. The coating prepared at 10 A/dm2,5 0Hz and 50 min, has the lowest solar absorptance (0.34) and the highest infrared emissivity (0.9). © 2015 Elsevier B.V.

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