Using steel slag and charcoal as raw materials, the steel slag/charcoal nano-/micro-composites with magnetic-resistance mixed loss mode were fabricated by a high-performance milling process, and then the composition, ...
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Using steel slag and charcoal as raw materials, the steel slag/charcoal nano-/micro-composites with magnetic-resistance mixed loss mode were fabricated by a high-performance milling process, and then the composition, phase structure, morphology, and electromagnetic (EM) characteristics of the products were characterized by XRD, EDS, SEM, and vector network analyzer, respectively. The results showed that EM characteristics of the products were strongly dependent on the content of the charcoal (WCharcoal). The real and imaginary parts of the permittivity of the steel slag/charcoal nano-/micro-composites significantly increased with the increasing WCharcoal. Among them, the steel slag/charcoal composites with WCharcoal=50wt% exhibited the best EM-wave absorption performance, with a maximum reflectivity value of -33.4dB, the effective bandwidth 15.2GHz(<-10dB) and 8.6 GHz (<-20 dB), respectively, which is a consequence of enhanced dielectric loss and a proper EM matching.
作者：
Kaijie LinGuangze TangYujiang WangXinxin MaKen YukimuraSchool of Materials Science and Engineering
Harbin Institute of TechnologyHarbin 150001China National Key Laboratory of Science and Technology on Precision Hot Processing of MetalsHarbin Institute of TechnologyHarbin 150001China National Key Laboratory for RemanufacturingAcademy of Armored Forces EngineeringBeijing 100072China State Key Lab of Advanced Welding Production TechnologyHarbin Institute of TechnologyHarbin 150001China
The Fe2O3 nanoparticles activated V2O5 nanotubes were achieved via a hydrolysis method. The TEM and SEM images of the nanotubes indicated that the Fe2O3 nanoparticles with the particle size of about 15 nm were dispers...
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Lead free textured K_(0.5)Na_(0.5)NbO_(3) piezoelectric ceramics have been prepared by reactive-templated grain growth method by using NaNbO_(3) with different morphologies as templates. The NaNbO_(3) template particl...
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ISBN:
(纸本)9781457711626
Lead free textured K_(0.5)Na_(0.5)NbO_(3) piezoelectric ceramics have been prepared by reactive-templated grain growth method by using NaNbO_(3) with different morphologies as templates. The NaNbO_(3) template particles with different edge length (10-20 (mu)m) and thickness (0.5-2.5 (mu)m) was synthesized through controlling Bi_(1.5)Na_(x-1.5)Nb_(x)O_(3x+3) precursor's layer numbers x from 2 to 6 by two-step molten salt methods. The crystalline phases and microstructure of textured K_(0.5)Na_(0.5)NbO_(3) were characterized by X-ray diffraction and scanning electron microscopy, respectively. It shows that all the K_(0.5)Na_(0.5)NbO_(3) ceramics are orthorhombic perovskite structure with {001} orientation. By using the template particles with a ratio of edge length to thickness (l/h)(velence)approx10, the textured ceramics with optimized piezoelectric properties was prepared. The results indicate that the enhanced properties of textured ceramics are concerned with the template morphology.
In the present work, silicon nitride nanowires (SNNWs) have been synthesized via nitriding cryomilled nanocrystalline silicon powder. The silicon powder exhibits a fine polycrystalline structure after the cryomilling ...
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A novel way was used to prepare dense B4C ceramics at a lower temperature by reactive sintering from carbon and boron elemental powders. Spark Plasma Sintering (SPS) technique, a rapid and non-conventional powder cons...
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ISBN:
(纸本)9780470927151
A novel way was used to prepare dense B4C ceramics at a lower temperature by reactive sintering from carbon and boron elemental powders. Spark Plasma Sintering (SPS) technique, a rapid and non-conventional powder consolidation method, was employed. The densification, microstructure and mechanical property of the as-prepared B4C ceramics were investigated. The reactive sintering process could be divided into two stages, corresponding to synthesis (1300∼1700°C) and densification (1700∼1900°C), respectively. At those stages, boron first reacted with carbon to form B4C, and then the in-situ densification of the as-synthesized B4C occurred and was enhanced by increasing sintering temperature. B4C ceramics with grain size of several hundred nanometers and high densification (98%) were obtained at 1800°C, a lower sintering temperature as compared with general hot press. Due to the high densification and purity as well as fine texture, the SPS-sintered B4C ceramics had high Vickers hardness (48.8GPa), Young's modulus (264.5GPa), fracture toughness (3.9MPa·m1/2) and flexure strength (450MPa).
In real life, people always move according to a certain paths, for example, walking from one side of corridor to the other side of it, but not passing through the wall, and so on. Therefore, all kinds of possible path...
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In the present work, tetragonal BaTiO3 particles down to 20 nm have been synthesized by low temperature aqueous co-precipitation method through composition control. Field emission scanning electron microscopy (FE-SEM)...
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In the present work, tetragonal BaTiO3 particles down to 20 nm have been synthesized by low temperature aqueous co-precipitation method through composition control. Field emission scanning electron microscopy (FE-SEM) images indicated that the precipitates contained fine (about 20-30 nm) faceted particles. The Raman spectra revealed that tetragonal phase appeared with the increase in Ba/Ti ratio in the precursor solution. The appearance of tetragonal phase in BaTiO3 nanoparticle was related with the lattice defect revealed by lattice parameter and lattice strain calculated by XRD results. The lattice defect can be modified through composition control.
In this paper, we establish nonlinear GP model between impact factor of sci-tech journal and related indexes based on genetic programming approach. The proposed GP model utilizes average authors, number of district, n...
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In this paper, Fe-Mn-Cu-Co spinel materials with high infrared radiation property were prepared by doping TiO2. The microstructure and infrared radiation with different doping contents of TiO2 were studied. The result...
In this paper, Fe-Mn-Cu-Co spinel materials with high infrared radiation property were prepared by doping TiO2. The microstructure and infrared radiation with different doping contents of TiO2 were studied. The results show that infrared radiation of spinel materials were increased by doping TiO2 and the infrared absorption intensities of diesel oil in the ranges of 3000-2800 and 1500-1300 cm−1 were increased after activated by spinel materials. Diesel surface tension and viscosity were reduced after adding the spinels. When the doping amount of TiO2 was 10%, the effects on the decrease of the surface tension and viscosity reached the maximum.
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