Aerospace Research Institute of Materials And Processing Technology

Beijing, China

Aerospace Research Institute of Materials And Processing Technology

Beijing, China
SEARCH FILTERS
Time filter
Source Type

Patent
AVIC Composites Company Ltd and Aerospace Research Institute of Materials And Processing Technology | Date: 2014-01-22

The present invention relates to a continuous carbon fiber laminated reinforced resin matrix composite material with high conductivity and toughness, an intermediate state composite conductive sheet thereof, and a finished composite product, characterized in that non-woven cloth, porous film or fabric having network structure and low surface density is used as a functional carrier, attached with silver nano-wires having high conductivity and nano dimension and other assistant conductive components such as carbon nanotube, graphene and etc., to prepare a composite conductive sheet with high conductivity and toughening potential, which is then interposed between the layers of conventional carbon fiber laminated composite material for curing and molding, thus to obtain a structural composite material having overall high conductivity and toughness. Such method with easy operation may obtain a composite material having high conductivity and toughness while the resistivity of the layer and between the layers is sharply lowered, without causing great addition to the weight of the composite material.


Zhou Y.,Aerospace Research Institute of Materials And Processing Technology | Liu B.,CAS Shenyang Institute of Metal Research
Journal of the European Ceramic Society | Year: 2013

Minimum lattice thermal conductivities and mechanical properties of polymorphous MPO4 (M=Al, Ga) are investigated by first principles calculations. The theoretical minimum thermal conductivities are found to be 1.02W(mK)-1 for α-AlPO4, 1.20W(mK)-1 for β-AlPO4, 0.87W(mK)-1 for α-GaPO4 and 0.88W(mK)-1 for β-GaPO4. The lower thermal conductivities in comparison to YSZ can be attributed to the lattice phonon scattering due to the framework of heterogeneous bonds. In addition, the low shear-to-bulk modulus ratio for both β-AlPO4 (0.38) and β-GaPO4 (0.30) is observed. Our results suggest their applications as light-weight thermal insulator and damage-tolerant/machinable ceramics. © 2013 Elsevier Ltd.


Gao Y.K.,Aerospace Research Institute of Materials And Processing Technology
Materials Science and Engineering A | Year: 2011

The fatigue strength for 1×10 7 cycles of 7050-T7451 aluminum alloy was determined for machined, laser-peened, and shot-peened specimens. Moreover, fatigue lives were compared under the same load conditions. Results show that the laser peening induces a deeper compressive residual stress layer and better surface finish, therefore, it improves fatigue properties more effectively. Fractographic examination and analysis shows that the fatigue cracks initiate in the subsurface layer beneath the compressive residual stress field for laser- and shot-peened specimens, whereas the fatigue cracks form at surface for as-machined ones. © 2011 Elsevier B.V.


Gao Y.K.,Aerospace Research Institute of Materials And Processing Technology | Wu X.R.,Aerospace Research Institute of Materials And Processing Technology
Acta Materialia | Year: 2011

The effect of shot peening on small crack growth and on the fatigue life of 7475-T7351 aluminum alloy has been investigated. The experimental results show that cracks initiate at second phase particles in the alloy and that fatigue crack growth rates are greatly reduced after shot peening treatment. Stress intensity factors for small cracks subjected both to external loads and to shot peening-induced residual stresses have been determined using weight function methods. Small crack growth rates and fatigue lives of naturally occurring small cracks in shot peened and unpeened specimens were calculated using small crack theory and a crack closure model. The predicted results agree well with the experimental data. The study demonstrates that fatigue life extension by shot peening can be attributed to beneficial compressive residual stresses in the surface layer, that the principle of superposition is applicable to fracture mechanics, and that the effect of residual stress on crack growth can be quantitatively analyzed using weight function methods. It is shown that the total fatigue lives for materials/structures containing residual stresses can be predicted by the crack closure-based small crack theory, provided that residual stresses are properly taken into account. © 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.


Gao Y.-K.,Aerospace Research Institute of Materials And Processing Technology
Applied Surface Science | Year: 2011

Surface integrity changes of TA2 pure titanium including surface topography, microstructure and nanohardness distribution along surface layer were investigated by different techniques of low energy high current pulsed electron beam treatments (LEHCPEBTs). The surface topography was characterized by SEM. Moreover, the TEM observation and X-ray diffraction analysis were performed to reveal the surface modification mechanism of TA2 pure titanium by LEHCPEBTs. The surface roughness was modified by electron beam treatment and the polishing mechanism was analyzed by studying the cross section microstructure of electron beam treated specimens by SEM and TEM. The results show that the surface finish obtains good polishing quality and there is no phase transformation but the dislocations by LEHCPEBT. Furthermore, the nanohardness in the surface modified layer is improved. The remelt and fine-grain microstructure of surface layer caused by LEHCPEBTs are the main polishing mechanism and the reason of modification of surface topography and the increment in nanohardness is mainly due to the dislocations and fine grains in the modified layer induced by LEHCPEBT. © 2011 Elsevier B.V. All rights reserved.


Patent
Aerospace Research Institute of Materials And Processing Technology | Date: 2013-08-28

A damping rubber spring for an automobile suspension, including: n rubber layers (2), n being a natural number not less than 3; n+1 metal partition layers (1) including an upper partition layer (4) and a lower partition layer (5), the n rubber layers (2) and the n+1 metal partition layers (1) being laminated alternately with each other, and the upper partition layer (4) being disposed in parallel with the lower partition layer (5), wherein an m-th rubber layer (2) starting from the upper partition layer (4) has a thickness or cross section area that is the same as that of an m-th rubber layer (2) starting from the lower partition layer (5).


Patent
Aerospace Research Institute of Materials And Processing Technology | Date: 2015-07-08

An auxiliary rubber spring for an automobile suspension, comprising: N layers of metal partitions, N being an integer greater than or equal to 1, and a transverse section of each metal partition being arc-shaped; N+1 rubber layers, the rubber layers being alternately lapped with the metal partitions, and a transversal section of each rubber layer being arc-shaped; a supporting plate provided with a first convex arc surface on one side thereof, the first convex arc surface being bonded to a first concave arc surface of an outermost rubber layer; and a connecting plate provided with a second concave arc surface on one thereof, the second concave arc surface being bonded to a second convex arc surface of another outermost rubber layer. The auxiliary rubber spring for an automobile suspension according to the present invention may increase fatigue resistance of the rubber spring and effectively extend service life thereof


Patent
Aerospace Research Institute of Materials And Processing Technology | Date: 2016-09-30

A method of reinforcing a metallic material includes adding graphene to an alcohol solution; subjecting the alcohol solution containing graphene to sonication; mixing a metal powder with the alcohol solution containing graphene; milling the metal powder and alcohol solution containing graphene mixture; drying the metal powder and alcohol solution containing graphene mixture to form a composite powder; subjecting the composite powder to a densification process followed by a hot isostatic pressing treatment to form a composite material; and molding the composite material by hot extrusion.


Patent
Aerospace Research Institute of Materials And Processing Technology | Date: 2016-09-30

A method for preparing a graphene/metal composite sheet includes adding polyvinyl alcohol into distilled water and heat to about 100 C. under stirring to prepare a polyvinyl alcohol solution; dispersing graphene in distilled water using ultrasonication to prepare a graphene solution; mixing the polyvinyl alcohol solution and the graphene solution to form a graphene/polyvinyl alcohol mixed slurry; after a metal sheet is subjected to a surface activation treatment, coating the graphene/polyvinyl alcohol mixed slurry onto the metal sheet at both upper and lower surfaces; vacuum sintering to remove the polyvinyl alcohol in the surface coating to obtain a graphene/metal plate; overlaying at least two graphene/metal plates and bonding them together via hot isostatic pressing to form multilayer graphene/metal plates; and hot rolling the bonded multilayer graphene/metal plates to form the graphene/metal composite sheet.


Patent
Aerospace Research Institute of Materials And Processing Technology | Date: 2013-08-28

An auxiliary rubber spring for an automobile suspension, comprising: N layers of metal partitions, N being an integer greater than or equal to 1, and a transverse section of each metal partition being arc-shaped; N+1 rubber layers, the rubber layers being alternately lapped with the metal partitions, and a transversal section of each rubber layer being arc-shaped; a supporting plate provided with a first convex arc surface on one side thereof, the first convex arc surface being bonded to a first concave arc surface of an outermost rubber layer; and a connecting plate provided with a second concave arc surface on one thereof, the second concave arc surface being bonded to a second convex arc surface of another outermost rubber layer. The auxiliary rubber spring for an automobile suspension according to the present invention may increase fatigue resistance of the rubber spring and effectively extend service life thereof.

Loading Aerospace Research Institute of Materials And Processing Technology collaborators
Loading Aerospace Research Institute of Materials And Processing Technology collaborators