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| 1 | Effect of boron doping on waterproof and dielectric properties of polyborosiloxane coating on SiO2f/SiO2 composites显示文摘A hydrophobic coating of the silica fiber reinforced silica composites(SiO2f/SiO2) was synthesized by sol-gel method using methyltriethoxy-silane(MTES) and boric acid(B(OH)3) as raw materials. The relationship among boron doping, chemical structure of precursors and durability of hydrophobic coatings was discussed. The Si-O-B and methyl groups were successfully introduced in the gel precursors according to the FT-IR and XPS results. The resins were filled in the internal and surface holes of the SiO2f/SiO2 composites partially or completely, which is beneficial to reduce the physical adsorption of the moisture. In addition, hydroxyl groups of the SiO2f/SiO2 composites reacted with the resins and hydrophobic methyl groups were introduced, leading to the reduction of the chemical adsorption of water. Also, the boron doping was beneficial to enhancing the physical cross-linking between the coating and the SiO2f/SiO2 composites, and improved the adhesion of the coating to the substrate. The results show that the optimal hydrophobic coating with contact angle 130.33°, moisture absorption 0.33% and adhesion level 1 is obtained when the molar ratio of MTES to B(OH)3 is 10:4. The real permittivity of M10B4 is constant in the range of 2.32–2.51 and the dielectric tangent loss is constant in the range of 5.5 × 10-4–8.7 × 10-3. The hydrophobic coating has excellent dielectric properties. | Long XIA Siru LU Bo ZHONG Longnan HUANG Hua YANG Tao ZHANG Haibo HAN Pan WANG Li XIONG Guangwu WEN | 2019 | Chinese Journal of Aeronautics2019，32，8： | 5 |
| 2 | Friction and wear behavior of carbon fiber reinforced lithium aluminosilicate composites sliding against GCr15 steel显示文摘Carbon fibers reinforced lithium aluminosilicate matrix composites(Cf/LAS)were prepared by slurry infiltration combined with a hot press procedure.The friction,wear behavior,and wear mechanisms of Cf/LAS composites under dry sliding conditions were investigated.The results show that the coefficient of friction(COF)initially increased with the increase in carbon fiber content,and reached the maximum value of 0.20 for the 33%Cf/LAS composite.The COF increased sharply with increasing sample temperature from RT to 300℃.The COF remained stable in the temperature range of 300–500℃.The two wear mechanisms of LAS glass-ceramics are fatigue wear and abrasive wear.The Cf/LAS composites demonstrate slight spalling and shallow scratches.These results show that carbon fibers improve the mechanical properties and wear resistance of Cf/LAS composites. | Haibao MA Xin WU Long XIA Longnan HUANG Li XIONG Hua YANG Bo ZHONG Tao ZHANG Zhiwei YANG Feng GAO Guangwu WEN | 2020 | Friction2020，8，6： | 1 |
| 3 | A versatile interferometric technique for probing the thermophysical properties of complex fluids显示文摘Laser-induced thermocapillary deformation of liquid surfaces has emerged as a promising tool to precisely characterize the thermophysical properties of pure fluids.However,challenges arise for nanofluid(NF)and soft biofluid systems where the direct interaction of the laser generates an intriguing interplay between heating,momentum,and scattering forces which can even damage soft biofluids.Here,we report a versatile,pump-probe-based,rapid,and non-contact interferometric technique that resolves interface dynamics of complex fluids with the precision of~1 nm in thick-film and 150 pm in thin-film regimes below the thermal limit without the use of lock-in or modulated beams.We characterize the thermophysical properties of complex NF in three exclusively different types of configurations.First,when the NF is heated from the bottom through an opaque substrate,we demonstrate that our methodology permits the measurement of thermophysical properties(viscosity,surface tension,and diffusivity)of complex NF and biofluids.Second,in a top illumination configuration,we show a precise characterization of NF by quantitively isolating the competing forces,taking advantage of the different time scales of these forces.Third,we show the measurement of NF confined in a metal cavity,in which the transient thermoelastic deformation of the metal surface provides the properties of the NF as well as thermo-mechanical properties of the metal.Our results reveal how the dissipative nature of the heatwave allows us to investigate thick-film dynamics in the thin-film regime,thereby suggesting a general approach for precision measurements of complex NFs,biofluids,and optofluidic devices. | Gopal Verma Gyanendra Yadav Chaudry Sajed Saraj Longnan Li Nenad Miljkovic Jean Pierre Delville Wei Li | 2022 | Light(Science & Applications)2022，11，5： | 0 |
| 4 | Smart Manufacture Process and Structure for Composite Materials显示文摘It is difficult to ensure the manufacturing process of composites for the reason that there are complicated processes during curing process of composites. The cure cycle has a significant effect on the quality of the finished part. The traditional cure cycle based on empirical approach could not ensure the quality of cured products because of unstabilized performance, high cost of production and low efficiency. As complex intelligent manufacturing systems are developed increasingly in industry, the necessity of more user friendly operation system is becoming progressively importance for their utilization and market value. This paper introduces some of the recent technological advances in the intelligent manufacturing systems that will influence the design and development of relevant industry. | 张宝友 Zhang Deqing Wang Zhengping Huang Longnan Liu Zhiqiang Li Xiaofeng Xia Weiguang Li Chensha | 2001 | High Technology Letters2001，7，4： | 0 |
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