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18. Fine study of hierarchical interphase constructed by boron nitride and carbon nanotubes in SiCf/SiC composites.

Author

Yan, Bing, Fan, Benhui, Huang, Xiaozhong, Du, Zuojuan, Liu, Yu, Yue, Jianling, and Bai, Jinbo

Subjects
CARBON nanotubes, SILICON carbide fibers, CHEMICAL vapor deposition, BORON nitride, TRANSMISSION electron microscopy, FRACTURE strength, SILICON carbide
Abstract

A fine study of the interfacial part in the silicon carbide fiber (SiCf) reinforced silicon carbide (SiC) composites was conducted by transmission electron microscopy. The boron nitride (BN) and carbon nanotubes (CNTs) were progressively coated on the SiCf by chemical vapor deposition method to form a hierarchical structure. Three composites with different interfaces, SiCf–CNTs/SiC, SiCf@BN/SiC, and SiCf@BN–CNTs/SiC, were fabricated by polymer infiltration and pyrolysis method. The interfaces and microstructures of the three composites were carefully characterized to investigate the improvement mechanism of strength and toughness. The results showed that BN could protect the surface of SiCf from corrosion and oxidation so that improved the possibility of debonding and pullout. CNTs could avoid the propagation of cracks in the composites so that improved the damage resistance of the matrix. The synergistic reinforcement brought by BN and CNTs interfaces made the SiCf@BN–CNTs/SiC composites with a tensile fracture strength as high as 359 MPa, with an improvement of 23% compared to that of SiCf@BN/SiC. [ABSTRACT FROM AUTHOR]

Published
2024
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30. Synthesis and Characterization of Co3O4/rGO Composite Magnetic Microwave Absorbing Materials.

Author

Chen, Ailiang, Luo, Guanwen, Sun, Xintao, Qiao, Jinxi, Cao, Jiang, Du, Zuojuan, and Li, Bowen

Subjects
MICROWAVE materials, GRAPHENE oxide
Abstract

To prepare high-performance microwave absorbing materials, Co3O4/reduced graphene oxide (rGO) composite materials were prepared from graphite powder and cobalt acetate by a simplified hydrothermal method. It is demonstrated that the reflection loss (RL) and effective absorption bandwidth (EAB) of Co3O4/rGO composites can be adjusted in accord of demands. By changing the thickness and the compositional ratio of the material, the electromagnetic parameters, attenuation constant and eddy current effect of the material can be adjusted to obtain desired outcomes. The EAB of Co3O4/rGO composites can cover 97.5% of 4–18 GHz band when thickness is 2–5 mm. The maximum RL of the obtained composite reached -64.8 dB when the thickness was 2.8 mm, and the maximum EAB was 9.63 GHz when the thickness was 3.0 mm. Because of its lamellar micromorphology, Co3O4 /rGO prepared in this study has made a breakthrough in its microwave absorption properties such as the highest reflection loss and effective absorption bandwidth. The result of this study provided a new approach for designing microwave absorption capacity. [ABSTRACT FROM AUTHOR]

Published
2023
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31. Extraction of Cerium from Catalyst of Waste Automobile Exhaust Gas Purifier

Author

Luo Guanwen, Ma Yutian, Chen Ai-liang, Bowen Li, Chen Shengli, Lu Sujun, Pan Yujun, Du Zuojuan, Qiao Jinxi, and Mao Jiale

Subjects
Cerium, chemistry.chemical_compound, chemistry, Inorganic chemistry, chemistry.chemical_element, Hydrochloric acid, Leaching (metallurgy), Hydrogen peroxide, Platinum, Catalysis, Rhodium, Palladium
Abstract

Automobile exhaust catalyst has been more and more widely used for creating a green life. It contains abundant platinum, palladium, rhodium, and rare earth cerium, compared with primary resources. It’s necessary to efficiently recover valuable metals with great application value. The feasibility of leaching cerium from hydrochloric acid system is mainly analyzed from the perspective of thermodynamics in this paper. The leaching experiment of hydrochloric acid oxidation is carried out. The results show that the leaching rate of cerium reaches only 46% when the concentration of hydrochloric acid was 4 mol/L, the reaction temperature was 80 °C, the amount of hydrogen peroxide was 10 ml, the liquid–solid ratio was 10:1, the reaction time was 2 h, and the stirring speed was 450 r/min. According to the metal equilibrium, it is inferred that the formation of stable Ce–Zr solid solution makes the lower leaching rate of cerium.

Published
2021

32. The Formation Mechanism of the Third Phase in Nickel Electrolyte

Author

Mao Jiale, Ma Yutian, Qiao Jinxi, Chen Ai-liang, Bowen Li, Lu Sujun, Luo Guanwen, Chen Shengli, Zhang Peng, and Du Zuojuan

Subjects
inorganic chemicals, Hydrolysis, chemistry.chemical_compound, Nickel, Third phase, chemistry, Precipitation (chemistry), Inorganic chemistry, Extraction (chemistry), Hydroxide, chemistry.chemical_element, Raffinate, Electrolyte
Abstract

The third phase is generated inevitably, but affects the quality of the electric nickel product in the nickel metallurgical process. This paper studies the formation and the prevention mechanism of the third phase in the raffinate. The analysis of Fe-S–Si-H2O system shows that iron exists in the form of Fe3+ at the pH value ≤ 2.17. With pH increasing, Fe3+ begins to hydrolyze to form FeOH2+. FeOH2+ continues to hydrolyze to form Fe(OH)2+ at the pH value ≥ 4.72. Fe3+ is reduced and hydrolyzed to FeOH+ when the potential ≤ 0.21 V. The precipitation of Fe2SiO4 is reduced at the potential ≤ 0.35 V and 5 ≤ pH value ≤ 13.2 when the solution contains silicon dioxide. The analysis of the third phase shows that it is mainly iron hydroxide, iron polynuclear hydroxyl complex ions, and Fe-SO4 complexes. It provides theoretical guidance for the formation of the third phase in the extraction multiphase system. This also plays a positive role in the production of high-quality nickel products.

Published
2021

36. CALCULATION AND ANALYSIS OF THE EFFECTIVE ELECTROMAGNETIC PARAMETERS OF PERIODIC STRUCTURAL RADAR ABSORBING MATERIAL USING SIMULATION AND INVERSION METHODS

Author

Huang Xiaozhong, Ding Zhou, Du Zuojuan, and Qiang Wang

Subjects
Mathematical optimization, Materials science, Acoustics, 0103 physical sciences, Inversion methods, 02 engineering and technology, 021001 nanoscience & nanotechnology, 010306 general physics, 0210 nano-technology, Condensed Matter Physics, 01 natural sciences, Radar-absorbent material, Electronic, Optical and Magnetic Materials
Published
2016

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