Papers by Keyword: Interlayer

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Authors: Pavel A. Ivanov, Alexander S. Potapov, Tat'yana P. Samsonova
Abstract: Forward current-voltage characteristics of non-ideal Ti / 4H-SiC Schottky barriers with ideality factor n = 1.1 - 1.2 have been analyzed. The non-ideality is considered as a result of formation of a thin intermediate dielectric layer between the deposited titanium layer and 4H-SiC. Using experimental current-voltage characteristics, the electro-physical characteristics of Ti contacts such as the energy barrier height, the thickness of the intermediate layer and the energy distribution of the interface trap density are determined.
Authors: Hong Ying Zhu, Le Xiao Lin, Ji Yin Zhou, Zhuo Ran Hou, Yun Xia Wang, Ting Zhang, Hao Zhang
Abstract: By observing rock thin sections, starting from the analysis on rock samples, mercury injection curves, casting thin sections and scanning electron microscopy, a detailed study of under Jurassic Badaowan Formation of the North Lake Oilfield heterogeneity in terms of content is done for the prediction and evaluation of favorable reservoir.
Authors: Yasushi Fukuzawa, Shigeru Nagasawa, Shigehiko Takaoka
Abstract: To make the tungsten and copper joint, several methods has been tried using the diffusion bonding system. When the thin plating Ni layer was used as the interlayer on tungsten surface, it bonded with copper under low bonding temperature and short holding duration by the pulse electric current sintering (PECS) machine. The effects of bonding temperature, bonding duration time, bonding pressure and the difference of specimen shape on the bonding strength were investigated. The tensile strength of joints depended on these factors. Highest strength attained to the copper tensile strength.
Authors: Carlo Gualco, Marco Grattarola, Alberto Federici, Francesco Mataloni, Karol Iždinský, F. Simančik, Bernhard Schwarz, C. García-Rosales, I. López-Galilea
Abstract: In Plasma Facing Components (PFCs) for nuclear fusion reactors, the protective material, carbon based or tungsten, has to be joined to the copper alloy heat sink for optimum heat transfer. High temperature vacuum brazing is a possible joining process as long as a proper interlayer is introduced to mitigate the residual stresses due to the mismatch of thermal expansion coefficient (CTE). Pure copper can act as plastic compliant layer, however for carbon based materials a proper structuring of the joining surface is necessary to meet the thermal fatigue lifetime requirements. In this work pure molybdenum and tungsten/copper Metal Matrix Composites (W-wires in Cu-matrix) interlayers have been studied as alternative to pure copper for carbon based protective materials in flat tile configuration. Finite element simulations of the brazing process have been performed to evaluate the expected residual stress reduction near the metal-carbon interface. In fact it has been demonstrated that stiff low CTE interlayers can shift the peak stresses from the weak carbon-metal interface to the strongest metal-metal one. Relevant samples have been manufactured and subjected to preliminary metallographic and thermal shock tests. Results obtained so far are encouraging and active cooled mock-ups are being prepared for high heat flux testing. Research work is in progress as regards monoblock configuration with both Wf/Cu MMC and graded Cu/W plasma sprayed and HIPped layers.
Authors: Tao Cui
Abstract: Through systematically geologic survey and observation of hand specimen this paper have a comprehensive research on the characteristics of interlayers in bauxite deposit of Wuchuan-Zheng,an-Daozhen (WZD) area. There are two kinds of interlayers in WZD bauxite: black coaly interlayer and brown hematitic interlayer. Black coaly interlayer indicate reduce and inshore environment, brown hematitic interlayer represent oxidized and strong hydrodynamic environment. The appearance of interlayer with contrary feature indicate sedimentary environment of the WZD bauxite is very complex.
Authors: R. Kumar, M. Balasubramanian
Abstract: Rotary Friction welding is a process of solid state joining, broadly in shaft and pipe weld, in the field of automobile, defence, aeronautical, chemical and nuclear environment assembly pipe lines. Due to its some distinctive advantages similar to ease of fabricate, environmentally sociable, high fabrication value and appropriate for similar, dissimilar metal joint. Now a day’s Titanium alloy and stainless steel materials are very popular material in industrial application due to its high mechanical potency, and non-corrosive in nature. In this study an attempt was made to join commercial rod of Ti-6Al-4V and Stainless steel304L with some methods and evaluates the joint strength. Different intermediate metals are taking on in this process and the outcomes are witnesses. From that study the best method of in-between metal was analyzed by carry out mechanical and metallurgical test.
Authors: Tomáš Bittner, Petr Tej, Petr Bouška, Miroslav Špaček, Miroslav Vokáč
Abstract: The shear interaction of laminated glass belongs to the essential characteristics of this material. The impact of the increased temperature on deformation properties was tested within investigation of basic mechanical properties of laminated glass panes. The specimens of laminated glass with the size of 120 x 1100 mm loaded by four-point bending load were exposed to the effect of the gradually increasing temperature up to approximately 65 °C in a thermal chamber. The progress of the deformation was continuously monitored by a measuring device during both temperature rise and subsequent cooling. Four kinds of interlayers were tested in total. In this paper the obtained experimental results are compared to numerical FE analysis and also the degree of an interaction of particular interlayer is evaluated.
Authors: Tomáš Bittner, Petr Tej, Petr Bouška, Miroslav Vokáč
Abstract: The degradation of laminated glass as a result of increased temperature has become one of the important problem of reconstructions and designs of new glass structures, for instance high-rise buildings that are exposed to the impacts of an intensive heating caused e. g. by sunshine. The temperatures during heating can reach very high values, commonly from 60 to 70 °C. The effect of heating was simulated using the thermal chamber where the glass panes with the size of 120 x 1100 mm were heated. The deformation course under the increase of temperature was continually monitored by a measuring unit. In total six types of foils joining particular layers of glass were examined. In this paper the experimentally gained results are compared with a numeric computer analysis and the particular kinds of interlayers are evaluated using the loss of shear interaction.
Authors: Jia Geng Liu, Jing Tao Han, Jing Liu, Shuai Ji
Abstract: The diffusion bonding process of commercially pure titanium to Q235B is achieved using copper as interlayer. The microstructure, component distribution and phase formation at the interface is analyzed by the use of microscope, SEM and XRD, the mechanical property is also investigated through the shear test. There is a good bond at the interface from 900 to 1000°C, no big cracks and voids, Q235B/Cu interface is straight, and Cu/TA1 interface shows waviness. With the increase of diffusion temperature from 900 to 1000°C, the shear strength increases first ,and then drops, however, with the increase of holding time from 30 to 60 minutes, the shear strength drops all the time, the maximum shear strength is 80MPa at 950°C for holding time of 30 minutes.
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