Phases in cement paste can be identified in micro scale by dynamic mechanical analysis (DMA) based modulus mapping owing to the characteristics of this technique: rapid, precise, high resolution and non-destructive. According to the storage modulus mapping which reflects the differences of elastic properties, the unhydrated clinker, as well as the high density calcium silicate hydrate (CSH) gel and low density CSH gel, which surrounded the clinker can be recognized with the assistance of morphology observation, components analysis and in-situ static indentation etc. Results show that the chemical composition of HD CSH and LD CSH is the same, while their storage modulus are 36GPa and 24GPa respectively, and the phase identification can be accomplished by taking the individual storage modulus into account. Therefore, blindness and repetition in traditional experiments can be avoided by employing the method of DMA-based modulus mapping, and then the properties of interested phase can be acquired with targeted approach.

A two-stage light gas gun is used to launch nonmetallic projectiles, which were heated cyclically before launch, impacting on woven stuffed shield. The damage model of woven stuffed shield impacted by projectiles of different materials was acquired. The effect of cyclic heating of nonmetallic projectile on the fragmentation characteristics of the projectile and the damage of woven stuffed shield was investigated. The nonmetallic projectile was heated cyclically in a temperature range of 20-150℃. Impact velocities of projectile varied in a range of 1.52-3.26 km/s. The impact angle was 0°. The results indicate that the perforation diameter of thin Al-plate impacted by ceramic projectile is smaller than that by Al-sphere when the size of the two projectiles are the same. The cyclically heated projectiles of ceramic and nylon can cause larger center impact perforations of woven stuffed bumper. Furthermore, the cyclic heating could enhance the damage capability of ceramic projectile but weaken that of nylon projectile on woven stuffed shield.

The UV aging resistance of the cross-linked polystyrene(CLPS) and CLPS /mica composites were comparatively studied. The results showed that the tensile strength and impact strength of the CLPS and the CLPS/mica composites decreased with the increasing irradiation time, but the retention rate of the tensile strength and impact strength of the CLPS/mica composites were substantially higher than that of CLPS, the higher mica content, the higher retention ratio. Infrared analysis showed that the CLPS had significant C=O absorption peaks in IR spectrum after irradiation for 18 days. Thermal gravimetric analysis showed that the thermal property of the CLPS/mica were better than the pure CLPS after UV aging. It was proved that mica could improve UV aging properties of the cross-linked polystyrene.

Plate tensile specimens were machined from a Ni-base single crystal (SC) superalloy DD33, holes with various diameters were electrochemically machined (ECM) in the middle of the specimens. The strain fields around the holes during room temperature tensile tests were in-situ observed by an ARAMIS - optical deformation analysis system based on the digital image correlation (DIC) technique and the fracture surface was observed by scanning electron microscope (SEM). It was demonstrated that the yield strength and ultimate tensile strength decreased with the increase of hole diameter from 0.5 mm to 0.9 mm. Strain concentrated in the vicinity of the hole. The maximum strain increased slightly during elastic deformation. However, once plastic deformation began, it increased rapidly above its elastic value. In addition, the maximum strain and strain gradients adjacent to the holes increased with the increase of the hole diameter from 0.5 mm to 0.9 mm. This work is critical for understanding the crack initiation around the cooling holes with different diameters in the SC blade.

The reaction products of a system of geopolymer could be great different due to the variation of the chemical composition of raw materials and the activated conditions. In the system of geopolymer containing calcium, the reaction mechanism, composition of products, and their structures could be more complex. Metakaolin (MK)-based geopolymer was prepared from metakaolin with different amount of five kinds of crystal calcium resources and two kinds of non-crystal calcium sources. The effect of calcium resource on the performance and reaction mechanism of the geopolymer was then systematically studied. The result showed that the dissolution of Si and Al related to the structure of the calcium resources and had a strong positive correlation, but no clear relationship with Ca. The compressive strength of MK-based geopolymer could decrease by addition of calcium resources. The compressive strength of geopolymer with non-crystal calcium resource was higher than that with crystal one. The dessolved amount of calcium from the calcium resource had a negative connection with the compressive strength. It provided the theoretical and experimental base for broadening the raw material resources of geopolymer system, and for utilization of industrial solid wastes containing calcium.

FEM calculation for the preparation process of SiC fiber and SiC/Ti-6Al-4V composite was carried out to investigate the effect of different processing parameters on the residual stress of the SiC fiber as well as the densification behavior and residual stress of the composite. The results show that, for the fabrication process of fibers, the axial thermal stress of the WC layer decreases with the decrease of deposition temperature and thickness of C layer. For the densification of composites, HIP temperature and sheath thickness have greater impact on the density, but HIP time and fiber volume fraction have smaller impact; with the increasing HIP temperature and decreasing sheath thickness, the density of the composite could be enhanced; the radial residual stress on the matrix greatly increases with the increase of HIP temperature and fiber volume fraction and decrease of sheath thickness appropriately; the hoop residual stress on the matrix greatly decreases with the increase of HIP temperature and sheath thickness, while decrease of HIP time appropriately. Finally the following processing parameters were recommended for preparation of SiC/Ti-6Al-4V composite with good quality: HIP temperature 950-960℃, HIP time 9 h and sheath thickness 70-80 mm and fiber volume fraction 45%-50%. FEM calculation results show some differences with those measured in the experiment for the residual stress of the composite, but with similar variation tendency.

Uniform-sized and monodisperse ceria (CeO₂) hollow nanospheres were synthesized in a ethylene glycol aqueous solution with cerium nitrate hexahydrate (Ce(NO₃)₃·6H₂O) as cerium sources and polyvinylpyrrolidone (PVP) as surfactant. The synthesized products were characterized by means of Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray photoelectron spectrum (XPS), X-ray diffraction (XRD), N₂ adsorption-desorption and UV-Vis. The results show that the porous CeO₂ hollow nanospheres composed of small nanoparticles with cubic fluorite structure; the average diameter and wall thickness of the CeO₂ hollow nanospheres were about 400nm and 30 nm respectively; they have a high specific surface area of 76.86 m²g^-1 and BJH pore size about 3~5 nm. On the basis of time-dependent experiment, the relevant formation mechanism was proposed. The ceria hollow nanospheres show an excellent adsorption rate about 70% of heavy metal ions at room temperature for Cr(VI) solutions, which is 3 times higher than that of ceria powder.

Fusion weld of TA1/X80 composite plate was carried out by taking foils of TiNi, and NiCrMo as the double transition layer weld material. Then the microstructure, morphology, chemical and phase composition and mechanical properties of the weld metal were characterized by means of metallography, SEM, EDS, XRD. Results revealed that the weld seam with TA1/TiNi weld metal exhibited a microstructure with equiaxed grains, and the Ti content drastically descended along a line from TA1 side to TiNi side while Ni content gradual increases. The weld seam with TiNi/NiCrMo exhibited a dendritic microstructure and there existed a 40 μm wide transitional zone, and the Ti content rapidly reduced along a line from TiNi side to NiCrMo side, while Ni content decreased first and then restored, but Cr and Mo increased gradually. The weld seam of NiCrMo/X80 showed a mixed grain- and acicular-like microstructure, and the Fe content increased sharply at the interface. while the Ni content and Cr content reduced dramatically along a line from the NiCrMo side to the X80 side. The strength and toughness of welded joint are lower than that of the base metal area due to that there existed a certain number of brittle phases in the weld seams with TiNi and NiCrMo.

The resistance to repeated low-velocity impact of PU coated composite laminates of different thickness was evaluated. The composite laminates were fabricated by compression molding method, and then were sand-blasted in order to increase their surface roughness, and finally were coated with PU of the same thickness. The composite laminates with and without PU coating were impacted repeatedly using a pressure-assisted Instron-Dynatup 9250 instrumented drop-weight impact tester until all the specimens were perforated, and then ultrasonic C-scan was used to detect the delimitation area after testing. It is observed that the influence of PU on the resistance to repeated impact of composite laminates is gradually decreasing after repeated impacting with the increasing of impacted energy, so the damage area of specimens are increasing after repeated impact. In addition, with the increasing thickness of composite laminates, the influence of PU acting on the resistance to repeated impact for all laminates is enhanced so that the damage area of specimens is gradually decreasing.

The fluorescent films were produced by phosphors and silicones for LED packaging modules. Then the high-power white LEDs were fabricated based on these films and 455 nm Ga(In)N chip modules. The fluorescent films and the fabricated LEDs are characterized by absorption, fluorescent and electroluminescent spectra in details. It follows that the prepared films are smooth and uniform with high quality; the absorption peaks of the films based Y₃Al₅O₁₂:Ce³⁺ (YAG) phosphors are around 337 nm and 450 nm, respectively, corresponding to the f-d transition of Ce³⁺ in YAG phosphors; the fluorescent films with thickness of 1.00 mm are suitable for 2.8 W LED modules; the luminous efficiency of the fabricated LEDs can reach 76 lm/W. The influence of the ratio of red phosphors to yellow phosphors on the white LEDs was also examined in order to prepare the white LED with high color rendering index. Then white LEDs with the correlated color temperature T_c of 4460K, and the color rendering index of 91.7 was also obtained.

Using ethylenediamine functionalized graphene (GS-EDA) as nano-filler and maleic anhydride grafted polyolefin elastomer (POE-g-MAH) as toughening agent, the PP/POE-g-MAH/GS-EDA nanocomposites were prepared by melt blending method. The morphology and properties of nano-filler and the prepared nanocomposites were characterized in detail by means of Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), differential scanning calorimetric analysis (DSC), thermogravimetric analysis (TGA), mechanical properties, thermal deformation temperature and melt flow rate tests. The results indicated that EDA was successfully grafted onto GS. The reactions between the GS-EDA and POE-g-MAH could improve effectively the interfacial compatibility of blending systems and the dispersion of GS-EDA in the matrix. The tensile strength, elastic modulus and impact strength of the nanocomposites with 0.5 mass% GS-EDA increased by 25.2%, 32.5% and 26.9% respectively in comparison with those of PP/POE-g-MAH without GS-EDA. The comprehensive mechanical performance could also be acquired for the PP/POE-g-MAH/GS-EDA nanocomposite with 0.5 mass% GS-EDA. The crystalline temperature, melting temperature and the degree of crystalline of the PP/POE-g-MAH/GS-EDA composites increased due to the GS-EDA incorporation. The thermal stability of all the PP/POE-g-MAH/GS-EDA composites is improved, while the melt flow rate decreased gradually, with the addition of GS-EDA.