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Xiao F.,Beijing Aeronautical Science and Technology Research Institute | Jiang M.-C.,AVIC Composite Co. | Liu Q.,AVIC Composite Co. | Chen Z.-P.,Beijing Aeronautical Science and Technology Research Institute | Zhang B.-M.,Beihang University
Hangkong Cailiao Xuebao/Journal of Aeronautical Materials | Year: 2015

In the process of composites fluid molding, the filling time and pressure of resin can be forecasted with using computer-aided simulation software, which can provide reference design for the real molding process of resin flow. The simulation of the resin flow had been carried out for flap structural composite by using PAM-RTM software. According to the Darcy's law, the formula of permeability was deduced when the resin flow along reinforce fiber. The permeability of carbon fiber and suture fiber was tested and revised respectively. The simulation of the resin flow was carried out by using several runner means. The final reasonable injection port and runner were chosen according to simulation results. The chosen means were verified by the process experims, also the structural component was tested by using ultrasonic nondestructive testing. The results show that the theoretical filling time is almost consistent with the filling time measured by the experiments. It is not found that the internal defect is existed in structural components. The resin filling is enough, to prove that the simulation is valid. ©, 2015, Chinese Journal of Aeronautics. All right reserved.


Chen M.,AVIC Composite Co. | Qiu H.,AVIC Composite Co. | Zhang W.,CAS Institute of Process Engineering | Jiao J.,AVIC Composite Co. | Wang R.,North China Electrical Power University
Key Engineering Materials | Year: 2014

The pyrolysis ceramic dynamic process of ZrC ceramic precursor was characterized by means of on-line TG-DSC-FTIR-MS coupling technique, and the conversion mechanism of ZrC ceramic was investigated based on XRD, SEM, TEM and XRF. ZrC ceramic could be obtained at 1400°C lower than theoretic temperature when Zirconium element is reduced by carbon from ZrO2. The results showed that ZrC ceramic precursor presented storage stability and excellent solubility in toluene. Ethanol, carbon dioxide, acetone and tetrahydrofuran (THF) were given off before heat treatment at 1100°C, and the pyrolysis product held in the form of ZrO2 and amorphous carbon. ZrC crystals were gradually formed when heated up to 1200°C and obtained completely at 1400°C. This ZrC ceramic precursor provides promising candidate for oxidation resistance and ablation resistance ZrC-SiC ceramic matrix composites. © (2014) Trans Tech Publications.


Chen M.W.,AVIC Composite Co. | Qiu H.P.,AVIC Composite Co. | Jiao J.,AVIC Composite Co. | Zhang W.G.,CAS Institute of Process Engineering | And 4 more authors.
Advanced Materials Research | Year: 2014

The pyrolysis dynamic process of ZrB2 organic precursor, soluble in benzene homologues with polycarbosilane, was characterized by means of on-line TG-DSC-FTIR-MS coupling technique. The conversion mechanism of ZrB2 ceramic was investigated based on EDS, SEM and XRD. The results show that methylamine, methane, acetone and propene were given off before heat treatment at 1000°C, and the pyrolysis product of ZrB2 precursor existed in the form of ZrO2, B2O3 and amorphous carbon. ZrB2 crystals are obtained completely by the carbothermal reduction process with the release of carbon dioxide at 1500°C. © (2014) Trans Tech Publications, Switzerland.


Li X.Q.,AVIC Composite Co. | Qiu H.P.,AVIC Composite Co. | Jiao J.,AVIC Composite Co.
Advanced Materials Research | Year: 2014

The ZrC/SiC multi-components modified C/C composites were prepared by using a hybrid precursor containning polycarbosilane and organic zirconium-contained polymeric precursor as impregnant and C/C composites of low density as preform. The porosity, microstructure and mechanical properties of samples were characterized with mercury injection apparatus, scanning electron microscopy and universal electron testing machine respectively. The results show that the porosity and average pore diameter decrease firstly and increase subsequently with the increase of organic zirconium content of the precursor. When the content of organic zirconium is 50%, the porosity and average pore diameter reach minimum which were7.27% and 0.0795um respectively. The most probabilistic pore diameter shifted from 10-100um to 1-10um at the same time; Meanwhile, the flexural properties also increases and drops immediately as the content of organic zirconium in the precursor adds. When the content of organic zirconium is 25%, the flexural strength reaches maximum of 245.20MPa.The improved flexural properties is attributed to the proper bonding of fiber-matrix interface and the low porosity of samples. © (2014) Trans Tech Publications, Switzerland.


Li J.,AVIC Composite Co. | Shi F.,AVIC Composite Co. | Shi F.,Aerospace Research Institute of Materials And Processing Technology | Lyu J.,AVIC Shenyang Liming Aerospace engine Group Co. | And 2 more authors.
Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | Year: 2015

The electric-arc-produced graphene materials were characterized and evaluated by a series of methods such as X-ray photoelectron spectroscopy, Raman spectra, infrared spectroscopy and scanning electron microscope analysis. Results show that the content of C element in graphene is 89.77%, and those of O and N elements are 3.03% and 7.21%. The sample has been identified as multilayer graphene-based Raman spectra G peak and 2D peak position. Adsorption of water in graphene sample is also detected by infrared spectroscopy. The layer number and size of graphene layer structure are observed through microscopic observation. This paper summarized a series of test schemes to characterize graphene,which provides a basis of evaluation for the dissemination and application of graphene in composites. © 2015, BUAA Culture Media Group Ltd.. All right reserved.

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