AVIC Composites Co.

Beijing, China

AVIC Composites Co.

Beijing, China
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Gong M.,Beihang University | Yang J.,Beihang University | Li L.,Beihang University | Zhao X.,Beihang University | And 3 more authors.
Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | Year: 2017

The effects of bismaleimide tackifier with different contents on the styling effects, liquid composite molding processes and mechanical performances of the 0°/90° biaxial non-crimp fabric (NCF) were mianly studied. The thickness springback and C type springback researches were used to characterize the styling effects. The thickness compress and the bias extension test methods were used to characterize molding processes of NCF. And three-point bending experiment and interlaminar shear test were conducted on the mechanical properties of NCF. The experimental results show that bismaleimide tackifier plays significant styling effects on preform. The in-plane shear properties and the resistance of shear deformation of NCF with tackifier are obviously improved. The addition of tackifier has little effects on mechanical properties of the 0°/90° biaxial NCF. Tackifier can improve the performances of liquid composite molding processes of NCF, and preserve mechanical properties of the composites at the same time. © 2017, Chinese Society for Composite Materials. All right reserved.

Zhao Z.J.,Harbin Institute of Technology | Zhao Z.J.,AVIC Composites Co. | Zhang B.Y.,Harbin Institute of Technology | Du Y.,Harbin Institute of Technology | And 5 more authors.
Composites Part B: Engineering | Year: 2017

In this paper, a structure-conductive carbon fiber reinforced composites (CFRPs) were fabricated. Its mechanical and electrical properties were characterized. The contribution of its modifier, multi-wall carbon nanotube (MWCNT) to the overall EMS (electromagnetic shielding) effectiveness of CFRP was analyzed. To simultaneously enhance the mechanical strength and electrical conductivity, the MWCNT was well dispersed into aerospace grade epoxy base resin. Afterward, The MWCNT carrying resin was impregnated over unidirectional fiber yarns to produce unidirectional prepreg, and MWCNT modified CFRP (MWCNT-CFRP) laminates were molded in an autoclave. The static mechanical strength, electrical conductivities, and electromagnetic shielding (EMS) effectiveness of MWCNT-CFRPs were tested. Relative analysis verified the conductivity dependence of their EMS performance, indicating the promising prospect of MWCNT-CFRPs for EMS structural composite. © 2017

Guo M.,AVIC Composites Co. | Yi X.,AVIC Composites Co. | Liu G.,AVIC Composites Co. | Liu L.,AVIC Composites Co.
Composites Science and Technology | Year: 2014

A simple method has been developed to simultaneously increase the electrical conductivity and the interlaminar fracture toughness of carbon fiber reinforced composite laminates. The key component of this function integration is a nylon veil surface-loaded with silver nanowires. By interleaving the electrical function-integrated veils into the laminate, the GIC and GIIC is improved 118% and 227%, and the conductivity perpendicular to the fiber direction and through-thickness direction is enhanced over 100 and 10times, respectively. © 2014 Elsevier Ltd.

Guo M.-C.,Tsinghua University | Guo M.-C.,AVIC Composites Co. | He Y.-N.,Tsinghua University | Wang X.-G.,Tsinghua University
Acta Polymerica Sinica | Year: 2013

The liquid-crystal (LC) alignment properties of surface relief gratings (SRGs) of different azo polymers and their correlations with grating parameters and polarizations of writing beams were studied. Three azo polymers with different kinds of azo chromophores and different chromophore densities were used in this study. The contrasts (Tmax/Tmin) and optical photographs of different liquid crystal cells were compared to determine the alignment properties. For the gratings with a period of 800 nm recorded by p + p interfering Ar laser beams on the epoxy based azo polymer containing 4-cyanoazobenzene chromophores (BP-AZ-CN) films, the ability for aligning liquid crystal increased with the increase of grating depths. For gratings of the epoxy based azo polymer containing 4-carboxylazobenzene chromophores (BP-AZ-CA) with a period of 800 nm and the gratings of the polyacrylate based azo polymer containing 4-carboxylazobenzene chromophores (PA-AZ-CA) with a period of 1200 nm, the liquid crystal showed uniform alignment when the grating depth was in a range from 16 to 100 nm. For the BP-AZ-CA gratings with a similar depth, the liquid crystal showed better alignment on the gratings with a period of 800 nm than gratings with a period of 1200 nm. Compared with BP-AZ-CA and PA-AZ-CA gratings with a period of 1200 nm, liquid crystal shows a better alignment on the PA-AZ-CA gratings. For the PA-AZ-CA gratings inscribed by RCP + LCP interfering Ar laser beams, no unidirectional alignment was observed even for the gratings depths over 100 nm. Above results can offer a better understanding of the effect of polymer structures and grating parameters on the liquid crystal alignment performance.

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