Abstract:Research status of welding at home and abroad is summarized about magnesium alloy and other metals, such as other magnesium alloy, aluminum alloy, steel, copper and copper alloy and titanium and titanium alloy.The research trends in this area are also proposed.

Abstract:A new technique called SILAR (Successive Ionic Layer Adsorption and Reaction) for the preparation
of ultra thin functional film and its development are introduced. The mechanism of the film nucleation and growth,the technics parameters effect,and the application situation are discussed and the main subjects to be deeply studied are poined out as well.

Abstract:The photoelectric conversation materials are the key part, which decides the conversation efficiency of
the thin film solar cells. The photoelectric conversation materials that can be used in the thin film solar cells mainly
include inorganic semiconductor materials and organic materials. In the present paper, the basic principle of thin film solar cells is introduced and the development of the two materials is reviewed. The advantage and disadvantage, the preparation methods and the future trends of every material are discussed.

Abstract:This paper reviews the researches on the constitutive relationships and shear performances of woven
preforms. Firstly, the classifications of the woven preforms are introduced, and the structures and properties of 3D woven preforms are analyzed. Then, the recent progresses of research related to the woven preforms are reviewed from the viewpoints of experimental method, constitutive theory and deformation simulation. The typical non-linear charac-teristics of the textile preforms are described, several models of constitutive relationship of woven preforms are introduced, and the progresses on the simulation of the fabric formability are reviewed. Finally,the existing problems and the investigation tendency of 3D textile performs are proposed.

Abstract:The solid model of the C/ E composite trellis wound structure and the mold of the sturcture were created by a 3D design software through deduction of the cylindrical helix and conical spiral parameter equation. Space correspondence can be realized on the base of the 3D model of the sturcture. It can reduce the development cycle and the development cost. It also can increase efficiency. The mold design method is feasible and is a kind of practical mold processing method.This method has been applied in project design.

Abstract:The mathematical model of fiber composite material winding steadily on ellipsoidalhead was established by application of differential geometry theory. The differential equations between winding angle/ center angle and axial coordinates were obtained,and then thickness of filament winding ellipsoidalhead was calculated by considering the geometrical relationship of winding path. The numerical example show that the calculation method reflects particular distribution rule of thickness on filament winding ellipsoidalhead, and the method can be applied to the preliminary design.

Abstract:This paper discusses the optimum design and welding process of the welding line. When the thichness
of the welding line area increases gradually, the strain in this area is coordinative. The improvement of mutual effect between welding line and EB can solve the problem of splash and the quality of welding line corresponds to the standard of GJB 1718A—2005. The mechanical properties of welding line, heat affect zone and raw material are approximately equivalent, the characteristics of the pressure vessel satisfy the design. The optimum design leads the stress of
welding line to decrease, the improvement of welding process increases the quality of welding line, the optimum design of welding line and improvement of welding process is the measure of improvement of welding quality and it is agreat significance of enhancement of pressure vessel performance.

Abstract:A polyferrocarbosilane( PFCS) was synthesized from polydimethylsilane ( PDMS) and ferrocene.
Nano-Fe3Si/ SiC composite ceramic absorbent can be obtained by pyrolyzing PFCS. It was systematically studied that electromagnetic parameter of absorbents was affected by some factors,for example,ferrocene,sintering temperature and holding time and so on. The results show 、and rincrease greatly by adding more ferrocene,raising sintering temperature and prolonging holding time.

Abstract:Two novel bis-benzocyclobutene-terminated monomers containing ether structure, BCB-1 and BCB-2
were synthesized by the nucleophillic reaction between 4-bromobenzocyclobutene and bisphenol A or N,by using cuprous chlorine as catalyzer. The cure behavior and processability of the two monomers were evaluated by DSC and rheometer. After curing,the thermal stability and dielectric properties of these cured resins were also investigated. The experimental results indicate that these monomers possess excellent processability,and that the cured resins derived from
them have good thermal stability and outstanding dielectric properties.

Abstract:The barium ferrite precursors gels were prepared with sol-gel process by using citric acid. The effect
of calcination temperature on its phase and the effect of multiple doping(Zr, Cu) on microwave absorbing properties were studied. The barium ferrite was synthesized at 1 200 for 1 h. The absorption properties of the ferrite could be improved by increasing doping content. The absorbing properties of the ferrite is the best,with reflection loss of -7. 81 dB at 10. 4 GHz when the content of copper and zirconium is 0. 8 (BaFe12-x(Cu0. 5Zr0. 5)x O19,x =0. 8).

Abstract:In order to obtain the optimized factors of ultrasonic Electroless Ni-Co-P Plating by using orthogonal
design experiments,a group of orthogonal tests was arranged and the effect of different additives on electroplating solutions and deposits properties was investigated,concentrations of additives were determined,5 processing parameters
were selected. L16(45) orthogonal test scheme was designed,range analysis was employed to find out the influence sequence on the technology and thus the optimum formula and process were ensured. The test results on optimum condition show that the alloy deposits with 88. 71wt% Ni,3. 72wt% Co,5. 99wt% P are obtained. The obtained Ni-Co-P coating are in fine crystal grain size,well distributed on the substrate surface. The optimized factors are as follows:nickel salt is 40 g/ L,cobaltous sulfate in the solution is 2 g,sodium hypophosphite in the solution is 25 g/L,sodium citrate in the solution is 50 g/L,boric acid in the solution is 20 g/L,the others annexing agent in the solution is 20 to 40 g/L,the pH value is 7. 0,the temperature is 90.

Abstract:Carbon fiber reinforced plastics is one of typical difficult to machine materials which will easily bring on disfigurements such as burrs, delamination and avulsion during drilling. In order to improve the drilling quality,the carbon fiber/ epoxy(C/E) composite was studied, and a grinding drill and its new process were developed. Some experiments on the grinding tool were carried out. The results show that the thrust force decreases by 30% -50%, the tool life is improved by 3 to 5 times and the disfigurements are minimized compared with the traditional carbide twist drill.

Abstract:By applying three steps autoclave cure process with female mold and preimpregnation honeycomb cure
process with special mold and selecting glass fabric reinforced epoxy prepreg and corresponding material, a large curvature multi-band airborne C-sandwich radome was developed. The results of electric property testing and static testing show the selection of material,structure design and process are feasible. The minimum power transmission efficiency of the radome is 84%; all parameter meet the requirement. The 200% designing load testing was successful;the radome is in agreement with structure designing specifications.

Abstract:Ultrasonically welding of 12 滋m PET/30 滋m PE laminated films were investigated in this paper. The
results show that the welding vibration amplitude has little effect on the welded joint strength of the laminated films when it varies between 2-10 滋m. The maximum welded joint strength appears when the welding vibration amplitude is 4-7 滋m. The welded joint strength increases first and decreases lately follow the increase of the welding time and welding pressure. The welded joint strength of PET/ PE is related to its crystal degree. When the welding time, welding pressure and the vibration amplitude increase, the crystal degree in the welding zone decreases first and then in creases, the welded joint strength increases first and decreases then. The PET/ PE welded joints show a wider melting
area and an accidented fracture surface and characteristics of tough fracture.

Abstract:A low damage unwinding following system was designed to reduce the damage of fibers wear in reeling off
procedure during filament winding. By analyzing the characteristics of the winding bobbin and unwinding movement, a novel method of angle replacement control and a strategy of thread guide adaptive following were proposed. This thread guide movement realiazed automatic following for arbitrary winding linear by computer controlled servo motor driving. Practical application shows that the forth method is feasible,the results of the following system are satisfactory,the damage of fibers wear is eliminated effectively and the quality of wound composite products is improved.

Abstract:The Al2O3 particles reinforced TDE-85 resin-based composite materials was prepared;surface modification technique was applied to the Al2O3 particles by using silicon hydride coupling agent (SCA). The effect of surface modification on mechanical properties was studied. The solid reaction temperature of composite materials was measured and the activation energy was calculated, the tensile fracture surface was observed with a scanning electron microscope. The experimental results show that when the content of Al2 O3 particles is 2wt%, the reaction speed is faster. Moreover, when the content of silicon hydride coupling agent arrives at 4wt%, the surface modification of Al2O3 particles is the best, and the comprehensive mechanical properties of composite can be improved.

Abstract:The calculation was carried out on flow field of supersonic turbulent duct. Two supersonic turbulent
ducts with initial area ratios 2. 0 and 3. 0 were calculated at three specific heat ratios:1. 1, 1. 2 and 1. 3. The results included the changes of total enthalpy, Mach number, pressure in duct, static enthalpy and recovery enthalpy with in crease of the cross area of duct. It shows the total enthalpy is constant in tests, but other parameters change with the increase of cross area of duct due to test materials ablation. Mach number increases with the increase of cross area,the other parameters decrease. When cross area of duct increases by 20%, Mach number increasing amplitude is less than 9%, the pressure decreasing amplitude in duct exceeds 20%, the decreasing amplitudes of static enthalpy and recovery enthalpy are within 8% and 1%. The increasing or decreasing amplitudes of parameters in duct are higher with specific heat ratio increasing and lower with initial area ratio increasing.

Abstract:The aeroheating ablation and erosion experiment of composite materials in arc-heater was introduced in
this paper. By means of improving arc heating test facility and dust-injection system, a prescribed amount of graphite dust particles were injected into the high pressure arc-heater plenum, where these particks were mixed with the high temperature heater air and then drag accelerated through the heater supersonic nozzle to impact the heated nosetip test particles. The measurement and calculation methods of flow field parameters were established at the same time. And then, this paper briefly describes the particle erosion performance of C/ C and WC-C/C thermal shield composite materials. The results show that
the flow field with particles can satisfy the needs of ablation and erosion experiment because of its excellent performance,and the erosion performance of WC-C/ C is better than that of C/C on arc heating conditions.

Abstract:By taking needled-carbon fiber felts as framework,C/C composites with different density were fabricated by chemical vapor infiltration method (CVI),and then C/C-Cu composites were made by squeeze casting technique. Flexural properties of C/C-Cu and C/C containing different components content were tested and investigated.The experimental results indicate that flexural strength of C/ C-Cu composites with the density of 4. 59 g/ cm3 is higher than that of C/ C composites with the density of 1. 85 g/ cm3 in xydirection. Those C/ C-Cu composites in which copper matrix plays a role of toughening and strengthening have certain plasticity;flexural strength of C/ C-Cu composites with the density of 2. 04 g/ cm3 is lower than that of C/ C composites with the density of 1. 85 g/ cm3 in xy-direction.Those C/C-Cu composites with dispersive copper matrix have no plasticity.

Abstract:The ITO/ Kapton/ Al Films and the S781 white coatings were two typical thermal control coatings used
on spacecrafts. The effects of electron irradiations of different energy on the solar absorptance(琢s) of them were studied. The X-ray photoelectron spectra(XPS) and the scanning electronic microscope( SEM) were used to analyze the element contents and the morphologies of the samples. The results show that for the same irradiation flux, the s of thermal control coatings are degraded to different degree after different energy electron irradiation. The changes of the reflection spectrums, the morphologies and the atomic contents of the samples are similar due to the same mechanism after electron irradiation of different energy.

Abstract:The temperature and internal strain are most important factors, affecting the curing processing and
structure properties of composites. The double fiber Bragg grating (FBG) sensors were embedded in the prepreg glass fiber/ epoxy laminate composite structure to monitor the variable of temperature,viscosity and internal strain in the hot-press curing processing and briefly analyze the residual strain after curing. The experiments indicate that the FBG sensors can monitor the temperature and internal strain in the curing processing of composites and provide a basis for intelligent curing control. Once the composite is cured, the same sensor can be used to provide the information about the mechanical/ temperature changes in the performance of structure.

Abstract:Hygrothermal properties of carbon fiber reinforced resin matrix composites is one of the important
problems for structure application of advanced composites. With experimental research on domestic carbon fiber reinforced resin matrix composites CF3052/5284RTM, the basic mechanical properties of composites in different hygrothemal condition were tested, and the influence of hygrothermal condition on basic mechanical properties of composites was analysed. The results show that the effects of hygrothermal condition on basic mechanical properties of composites were different, and humidity has a larger effect than temperature, the domestic carbon fiber composites can keep higher tensile strength and shear strength in the hygrothermal condition, and hygrothermal properties is excellent.

Abstract:In order to evaluate the creditability of ash content and find out the main influence factor, test process and calculating style for ash content in carbon fibre is analysed. The uncertainties of various variables and their sources in the process of test are brought forward and calculated. The combined uncertainty and expanded uncertainty are finally obtained. When ash content is 亿0. 1%, the expanded uncertainty is 0. 03% and the uncertainty coming from repeatability of results of measurements is the main influence factor. When ash content is <0. 1%, the expanded uncertainty is 0. 01% and the uncertainty coming from system of measurements is bigger than that coming from repeated measurements and it is the main influence factor.