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软硬混编预制体增强沥青基4D-C/C材料弯曲行为 总被引:2,自引:0,他引:2
以z向穿插炭棒、x-y向铺层纤维束法编织的软硬混编4D炭纤维预制体为增强体,采用沥青液相浸渍/炭化法制备了4D-C/C复合材料,研究了材料z向(炭棒方向)高温弯曲行为及损伤机理。结果表明:在室温~2 100℃范围,随着温度的升高,4D-C/C复合材料z向弯曲强度呈现先增加后减小的趋势,在室温~1 800℃时弯曲强度呈现增加的趋势,1 800℃后随着温度升高弯曲强度开始逐渐降低,但当温度达到2 100℃时其弯曲强度仍比室温下稍高。在室温~2 100℃范围,随着温度的升高,软硬混编预制体增强沥青基4D-C/C复合材料z向弯曲断裂应变一直呈增加的趋势,而弯曲弹性模量总体呈减小的趋势。室温下4D-C/C应力-应变曲线几乎为线性关系,高温下4D-C/C复合材料z向弯曲破坏更加趋向于非线性的破坏模式。损伤表征结果表明,随着温度的升高,材料破坏时的最大损伤逐渐增加。 相似文献
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996.
Ian Mabbett Jon Elvins Catherine Gowenlock Carol Glover Paul Jones Geraint Williams David Worsley 《Progress in Organic Coatings》2014
Near infrared (NIR) is becoming a popular option for rapid cure of coatings in the coil coating industry particularly where fast line speeds are required. The technology has the potential to reduce the cure time of a 20 μm polyester coating on a galvanised steel substrate from around 30 s via conventional heating methods down to <10 s under the lamps. Previous work suggested that the ideal situation in this case is to have a topcoat which is slightly transparent to NIR and an absorbing substrate to heat the coating from the substrate outwards in a two stage process which separates solvent removal from cross linking and film formation. This can be taken further by tinting the primer layer with a pigment that absorbs in the NIR region. In this study spectroscopy was used to show that a coated steel system could appear white in the visible region because of the reflectance of TiO2 but the NIR absorption could be altered by adding absorbing pigments such as carbon black. Lamp settings could be reduced by 20% to achieve equivalent cure with tinted primer systems. The potential degradation in corrosion protection afforded by carbon-black containing pigments at various loadings was assessed for model organic coatings applied to galvanised steel specimens. In situ scanning Kelvin probe studies showed that rates of corrosion-driven coating delamination by cathodic disbondment remained unchanged by pigment loadings of up to 3.5 wt%. 相似文献
997.
Hot corrosion is one of the main destructive factors in thermal barrier coatings (TBCs) which come as a result of molten salt effect on the coating–gas interface. Hot corrosion behavior of three types of plasma sprayed TBCs was evaluated: usual CSZ, layer composite of CSZ/Micro Al2O3 and layer composite of CSZ/Nano Al2O3 in which Al2O3 was as a topcoat on CSZ layer. Hot corrosion studies of plasma sprayed thermal barrier coatings (TBCs) were conducted in 45 wt% Na2SO4+55 wt% V2O5 molten salt at 1050 °C for 40 h. The graded microstructure of the coatings was examined using scanning electron microscope (SEM) and X-ray diffractometer (XRD) before and after hot corrosion test. The results showed that no damage and hot corrosion products was found on the surface of CSZ/Nano Al2O3 coating and monoclinic ZrO2 fraction was lower in CSZ/Micro Al2O3 coating in comparison with usual CSZ. reaction of molten salts with stabilizers of zirconia (Y2O3 and CeO2) that accompanied by formation of monoclinic zirconia, irregular shape crystals of YVO4, CeVO4 and semi-cubic crystals of CeO2 as hot corrosion products, caused the degradation of CSZ coating in usual CSZ and CSZ/Micro Al2O3 coating. 相似文献
998.
A Mo/TiN composite powder has been synthesized by a sol–gel method to improve the electrical performance and microstructural stability of the alkali metal thermal to electric converter electrode. The core (TiN)–shell (Mo) structure of the composite powder is confirmed by energy-dispersive X-ray spectroscopy and scanning electron microscopy. The composite powder is primarily composed of submicron (400–800 nm) particles that are coated on a core (>3–5 μm) particle. The Mo/TiN composite electrode exhibits high electrical conductivities of 1000 Scm−1 at 300 °C and 260 Scm−1 at 700 °C in an Ar atmosphere. The electrode exhibits excellent tolerance against grain growth during thermal cycling tests (R.T.↔800 °C), where the average growth rate of Mo grains in the Mo/TiN composite electrodes is controlled less than 0.5%/time (0.62→0.65 μm), while the growth rate in Mo electrodes is 306.7%/time (0.24→3.92 μm). It can be concluded that the Mo/TiN composite powder will suppress the degradation of the electrode and enhance the performance and durability of the unit cell at elevated temperatures. 相似文献
999.
Three-dimensional flower-like Bi2WO6 microspheres with the diameter of about 4 μm were prepared by a facile hydrothermal method using bismuth nitrate pentahydrate and sodium tungstate dihydrate as raw materials. A novel Ag-modified Bi2WO6 was synthesized through a simple and practical photoreduction process. The UV–vis diffuse reflectance spectra indicate that the Ag/Bi2WO6 samples have a significantly enhanced optical absorption in the visible light region than that of pure Bi2WO6 microspheres due to the surface plasmon resonance (SPR) of Ag nanoparticles on the surface of pure Bi2WO6. The photocatalytic activities of the as-prepared samples were evaluated by the decolorization of rhodamine B under simulated sun-light irradiation. The results reveal that the photocatalytic activities of the Ag/Bi2WO6 samples increase first and then decrease with increasing amount of loading Ag and the 1.0 wt% Ag-loaded Bi2WO6 sample exhibits the best photocatalytic activity compared with the other samples. The enhanced photocatalytic activity could be attributed to the synergistic effect of the strong SPR and the effective separation of photogenerated electrons and holes caused by Ag nanoparticles. 相似文献
1000.
Cu metal matrix composite with Y2W3O12 as a thermal expansion compensator was fabricated by high energy ball milling followed by compaction and sintering, and its thermal properties were explored for the potential applications as heat sinks in electronic industries, high precision optics, and space structures. The volume fraction of reinforcement was varied from 40% to 70% in order to tailor the composite for the simultaneous accomplishment of low thermal expansion and high thermal conductivity. The synthesis technique was optimized by varying the parameters like milling time from 1 to 20 h and sintering temperature from 600 to 1000 °C in order to achieve densified composites. The relative density of the composites is found to be around 90% for the 10 h milled powders followed by compaction at a pressure of 700 MPa and sintering at a temperature of 1000 °C. The thermal expansion of the composites exhibits linear behavior in the temperature range 200 to 800 °C and the low coefficient of thermal expansion (CTE) is found to be for Cu–70%Y2W3O12 composite whose value, 4.32±0.75×10−6/°C, matches with that of Si substrate. The thermal conductivities are found to increase with a decrease in the volume fraction of the reinforcement and decrease with an increase in the temperature for all the samples. The experimentally determined CTE and thermal conductivity values are found to be comparable to those predicted by the thermal expansion based Kerner and Turner model and the thermal conductivity based Maxwell model, respectively. 相似文献