Papers by Keyword: Infiltration

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Authors: Jing Wang, Yong Zhang, Wen Li Guo, Tong Xiang Liang, Chang Sheng Deng, Jing Ming Xu
Abstract: La0.8Sr0.2FeO3 electrodes modified with nanoparticles of La0.8Sr0.2MnO3 (LSF/LSM) were prepared by infiltration method. LSM solution had good wettability on LSF surfaces and good electrochemical compatibility with LSF. The impedance of half-cells incorporating the electrodes was also examined. The deconvolution of the impedance spectrum indicated that the peak positions are changed after the LSF infiltration. The LSF/LSM electrode exhibited smaller polarization resistance than pure LSF electrode. Finally, a transform from asymmetry to symmetry appeared in the polarization curves of LSF/LSM electrode with the increase of temperature.
Authors: Mafalda Guedes, José Maria F. Ferreira, Alberto C. Ferro
Abstract: This paper reports preliminary studies regarding a new fabrication process for aluminium alloy matrix particulate reinforced composites, which uses ceramic preforms with alumina and tailored amounts of reactive copper oxide, CuO. An Al2O3-CuO mixture with 75 mol% CuO was selected, aiming at a 10-40vol% reinforcement phase fraction in the final composite, after aluminium infiltration. Molten aluminium infiltration progress was studied as a function of ceramic’s composition, doping, and infiltration time. The resulting microstructures were investigated by OM, SEM, FESEM and EDS in order to establish the liquid aluminium infiltration profile at the metal/ceramic interface. Infiltration experiments showed that the 3CuO (s) + 2Al (l) → 3Cu (l) + Al2O3 (s) redox reaction is triggered at the experimental conditions used, but the infiltration process is slow and does not go to completion. The use of NaOH as a doping agent promotes effective infiltration of molten aluminium upon the ceramic green mixture.
Authors: Su In Lee, Hyun Jung Choi, Gyeong Seok Choi, Jae Sik Kang
Abstract: The airtightness performance of dilapidated dwellings is low. Infiltration occurs due to such low airtightness performance, causing the energy loss. Energy loss due to infiltration accounts for more than 30% of total energy loss in a building. Therefore, the airtightness performance should be considered by priority when retrofit of dilapidated dwelling is carried out. To improve the airtightness performance, numerous studies are underway. As a result, various products have been developed. The purpose of this study is to evaluate the performance of windbreak for improving the airtightness performance of dwelling and analyze the improvement level of airtightness performance of the room quantitatively after the windbreak is actually applied to dilapidated dwelling. In order to measure the airtightness performance of window where windbreak was applied, we measured the airtightness performance of window before and after windbreak was applied. Also, for the field performance evaluation, 27 dwellings were selected to measure the airtightness performance of the windbreak applied room. The measurement result showed that the infiltration rate of window where windbreak was applied decreased by approximately 48.66% in comparison to that before the windbreak was applied. And, The ACH50 (Air Change per Hour at 50 pascals of pressure) of the room where the windbreak was applied decreased by approximately 31.61%, confirming that the airtightness performance of window was improved through the application of windbreak.
Authors: G. Kapelski, A. Varloteaux
Authors: Jia Jiu Diao
Abstract: A series of advantages for resin matrix composites make it get extensive application in PCB Field. However, because the properties of composites depend on process crafts badly,unreasonable processing technology will lead forming difficult, and then redesign is needed. This affects production efficiency badly in PCB enterprise. According that composites forming process is huge and complicated, in order to evaluate whether it is rensonable on produce process. This paper try to discuss the technical method of improving the wettability of the composite material from the angle of the production process by increasing the infiltration area, gradually exhaust, increasing the total amount of the base material, pressure infiltration velocity difference and improve the shortcomings in the material production process review. This paper validates the methods useful and practical. It can get a better production effect of infiltration by increasing infiltration area, step by step exhaust, increasing the total matrix materials, speed difference infiltration, pressure type wait for infiltration. The rapid infiltration production technology not only improves the performance of composite materials, but also has important significance to improve the interfacial properties of the composites.
Authors: Piotr Kosiński, Robert Wójcik
Abstract: The paper presents the problem of windwashing in partitions including air permeable thermal insulations. There are technical solutions, which deliberately accept the filtration of air in the insulating layer, guided by the necessity of possible drying of building materials. Some scientific papers even suggest that the air infiltration decrease the heat losses through ventilation. In result there occur heat losses in building heat balance which are underestimated and therefore difficult to take into account during calculations. Heat changes on the inner surface of the building partition occur with a delay to the initiation of the wind. However, even the short-term local wind speed loads on thermal insulations result in temperature decreasing and therefore possible condensation on the inner surface of the building partition. The article presents laboratory measurements of air permeability of loose mineral wool and laboratory investigation of the impact of air filtration on heat transfer in lightweight partitions filled with loose thermal insulation.
Authors: Jia Ming Han, San Qing Su
Abstract: Pitted courtyard cave dwellings were used as a long-term living form in Baishe village. After field measurements, the size of local pitted courtyards and cave dwellings had been mastered, and the variation of average annual rainfall and monthly rainfall had been analyzed. By the experiment, the changes of physical and mechanical indexes could be showed with different water contents. At the same time, based on the literature, the relationship could be established between rainfall and water content. Basis in the expression of room rock stress and the Mohr-Coulomb strength criterion, the stability of the cave dwellings could be analyzed under different water contents, and the definition could be found of safety factor of loess cave. Then, the stability variation of loess cave dwelling could be obtained in different rainfall, and the evaluation results are given.
Authors: Stefan Junk, Rebecca Matt
Abstract: Today, 3D-printing with polymer plaster composites is a common method in Additive Manufacturing. This technique has proven to be especially suitable for the production of presentation models, due to the low cost of materials and the possibility to produce color-models. But nowadays it requires refinishing through the manual application of a layer of resin. However, the strength of these printed components is very limited, as the applied resin only penetrates a thin edge layer on the surface. This paper develops a new infiltration technique that allows for a significant increase in the strength of the 3D-printed component. For this process, the components are first dehydrated in a controlled two-tier procedure, before they are then penetrated with high-strength resin. The infiltrate used in this process differs significantly from materials traditionally used for infiltration. The result is an almost complete penetration of the components with high-strength infiltrate. As the whole process is computer-integrated, the results are also easier to reproduce, compared to manual infiltration. On the basis of extensive material testing with different testing specimen and testing methods, it can be demonstrated that a significant increase in strength and hardness can be achieved. Finally, this paper also considers the cost and energy consumption of this new infiltration method. As a result of this new technology, the scope of applicability of 3D-printing can be extended to cases that require significantly more strength, like the production of tools for the shaping of metals or used for the molding of plastics. Furthermore, both the process itself and the parameters used are monitored and can be optimized to individual requirements and different fields of application.
Authors: Dušan Dlhý, Peter Tomašovič, Ladislav Mihalčík
Abstract: The paper points at complex methodical approach when assessing noise coming from exterior into residential interior with emphasis on prevention and recommendations of WHO and EC in the phase of designing of building or territory. The ventilation system of the facade of particular building and its functional properties including acoustic and infiltration capability etc. should be designed and controlled upon ensuring complex function of such system and in compliance with the health and hygiene parameters of protected room.
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