Papers by Keyword: Interface

Abstract: The aim of this study was to investigate the recycling of waste cured epoxy molding compound (c-EMC) which was generated as the mold residue in molding process of electronic component packages, by way of blending the pulverized mold residue with poly (vinyl chloride) (PVC) and other additives to prepare a reproduction composite. The influence of modified and non-modified c-EMC powder on structure and properties of the composites were analyzed by mechanical tests, vicat softening point test (VST) and scanning electron microscopy (SEM). The results showed that simple adding c-EMC powder could improve the stiffness and heat resistance of the composites, though decreased the mechanical strength of the composites. After being pretreated by silane coupling agent γ-aminopropyltriethoxysilane (KH-550), modified c-EMC powder had effective strengthening and toughening effects on the composites with the increasing powder content. Furthermore, better interfacial adhesion and higher VST value of the composites were observed in the presence of KH-550.

Abstract: A Detailed Transmission Electron Microscopy (TEM) Study Has Been Made of the Ageing Hardening Behavior of the γ₁-Ti₄Nb₃Al₉ Precipitation Phase in the γ-TiAl Matrix in Ti-Al-Nb System. it Is Revealed that the γ₁-Ti4Nb₃Al₉ Precipitate, which Is Formed by a Normal Quench at 1473k and Ageing Treatment at 1073K, Takes Needle-Like Morphology with a Growing Axis Parallel to [001] Direction of the Matrix. the Needle-Like Precipitates Act as Barrier Grid to Inhibit Dislocation Moving on the Slipping Plane {111} of the γ-TiAl Matrix, which Helps to Improve the Strength of the Alloy. the Effects of the Third Element Niobium to the Strengthen of High Nb Containing TiAl Alloys Lie in Not only Solid Solution, but Also Ageing Hardening. the Interfaces between Precipitate and Matrix Are Also Investigated.

Abstract: Crystallization behavior of melt aluminum on the surfaces of SiC whisker (SiCw) was analyzed based on the consideration to obtain the SiC-Al interfaces with the lowest energy in SiCw/Al composite. The interfacial structure was investigated to determine whether a specific orientation relationship exists between SiC and Al. Analysis results indicate that four kinds of orientation relationships possibly exist between SiC and Al when only the <110> crystal direction of the aluminum is considered as the firstly formed crystal direction along the concave joint line of <110> of the SiC whisker. Interfacial atom match bonding models were set up in theory and one kind of crystal orientation relationship has been proved by our previous experimental result.

Abstract: TiAl based intermetallic compound claddings were produced on TA15 alloy surface by using laser depositing technology to melt Ti-46Al-2Cr metal powders. An interface layer between TA15 substrate and the TiAl claddings was formed. The influence of laser power, scanning speed and number of cladding layers on the interface layer and the hardness of TiAl claddings were investigated. Higher laser power and lower scanning speed made the interface layer thicker. Increasing the laser power and especially the scanning speed could improve the hardness of the TiAl claddings. When the second TiAl layer was deposited, there was no interface layer formed between the two TiAl layers, but the hardness of the first layer decreased and the second TiAl layer was softer than the first layer due to the rough microstructure.

Abstract: Hardfacing alloys reinforced with WC/W₂C on Q235 steel plates were prepared by the method of flux-cored wire TIG and MIG welding. The interface microstructure and carbide morphology were investigated using optical microscopy and scanning electron microscopy (SEM). The effect of dissolving of WC/W₂C on the interface microstructure was discussed. It indicated that the C-W-Fe ternary brittle compound has formed on the interface due to dissolving of WC/W₂C and the dissolving degree of the particles by TIG is less than by MIG. Abrasion resistance was evaluated by wet sand rubber wear tests and the wear mechanism was studied. The results show that WC/W₂C particles play a key role in improving abrasion resistance.

Abstract: Well aligned ZnO nanowire arrays are fabricated by a simple vapor phase transport process. Field-emission scanning electron microscopy shows the nanorods have a uniform length of about 1 um with diameters of 100 nm. After modified by ZnS, ZnO/ZnS core/shell nanowire arrays are formed and the thickness of ZnS layer increase with the increase of treatment time. X-ray diffraction analysis confirms that the as-synthesized ZnO nanorods are c-axis orientated, the modification of ZnS shell induces weak ZnS (100) diffraction peak for the treatment time of 180 min. The effects of shell thickness as a function of ZnS treatment time on the Raman scattering properties are studied. The results suggest that the coating of ZnS shell will change the Raman energy position and intensity of the ZnO nanowires, crystal lattice expansion and reconstruction of the ZnO/ZnS interface are responsible for the observed changes.

Abstract: In researching the thermal transmit and elastic thermal stress properties between the interfaces of different materials, such as the bricks and the fire – resistant soil in the annual structural of the blast furnace. This paper presents a axis symmetric model to calculate the temperature, the elastic deformation and the stress. This model has the advantages of high accuracy, simple in structure and easy in calculation. The research of the thermal stress by the interfaces mechanics has never been reported before.

Abstract: Small cities (including small towns) make contribution rate of 94% to the process of urbanization in the last century's accelerating development of urbanization. Accompany with this special industrialization and urbanization background, the typical way of work-live settlements gradually formed. Via studying on the feature of Work-live settlements, this paper plans to discover the living mode of the southern small towns in feature of region, so as to produce significant meaning to the residential environment construction of Yangtze River delta. Besides, through introducing the concept of interface and the characteristic of interface superposition, this paper puts forward primary study and discussion aiming at the interface space.

Abstract: It is described that the acceleration signal is modulated to optical phase by Micheson interference device and demodulated by Synthetic-heterodyne signal demodulation(SHSD) ,when the error is compensated by alternating current phase tracking homodyne compensation scheme (PTAC). Then the digital signal proseccing system is designed with SOPC technology. And DSP and intelligent data communication interface run in parallel . The experiment has shown that when the virtual value of external acceleration signal is constant, in selected working frequency range, the system output signal can trace the vibration acceleration signal linearly and reliably.

Abstract: The eccentricity coextrusion flow of polymer melt was analyzed based on finite element simulations. Such simulated results as the fields of flow velocity, pressure and shear stress were obtained. Through the analysis of the results, the mechanism of the column interface forming in the axis-symmetry coextrusion flow path was obtained. For the coextrusion flow, if the low viscosity polymer flows near the die wall, the flow would be steady. Whereas, if the polymer with low viscosity is in the core and the high viscosity polymer at the outer region, Which is disadvantage in terms of energy, and the instability flow would occur. This is also accord with the least energy consume theory.