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468 results on '"BAI Shuxin"'

111. Effects of SiC content on the mechanical and thermophysical properties of 3D Cf/SiC–Al composites

Author

Jia, Jinhao (author), Li, Cong (author), Chen, Qiang (author), Bai, Shuxin (author), Chang, J. (author), Xiong, Degan (author), Gao, Mingqi (author), Li, Shun (author), Xiao, Jin (author), Jia, Jinhao (author), Li, Cong (author), Chen, Qiang (author), Bai, Shuxin (author), Chang, J. (author), Xiong, Degan (author), Gao, Mingqi (author), Li, Shun (author), and Xiao, Jin (author)

Abstract

3D Cf/SiC–Al composites were achieved through the pressure infiltration of liquid Al–Si alloy into porous 3D Cf/SiC preform, which was produced by different cycles of precursor infiltration and pyrolysis. The effect of silicon carbide volume fraction on the microstructure, anisotropic mechanical response, and thermophysical characteristics of the 3D Cf/SiC–Al composites was investigated. The results demonstrated that the initial microstructure of 3D Cf/SiC can be retained, and the obtained Cf/SiC–Al composites presented remarkable anisotropy characteristics. As the silicon carbide ceramics content increased from 12.5 vol% to 41.8 vol%, the thermal conductivity and thermal expansion coefficient of 3D Cf/SiC–Al composites decreased, whereas the bending strength initially increased and then decreased in the Z-direction. The bending strength perpendicular (Z) to the carbon cloth layer of 3D Cf/SiC–Al composites was higher than that of parallel (X–Y) to the carbon cloth layer. However, a significant anisotropy in the thermal conductivity values was the opposite. The 3D Cf/SiC–Al composite with 1ow ceramic content (17 vol%) had a higher thermal conductivity in the X–Y direction (64 W m−1 K−1) than in the Z-direction (34 W m−1 K−1). The thermal expansion coefficient of all the 3D Cf/SiC–Al composites along the X–Y direction also decreased initially and then increased in the range of 100–450 °C, which presents low expansion characteristics., Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public., QN/Groeblacher Lab

Published
2022
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112. Modification of BaTiO3 for diversified applications by single Nd element substitution with wide doping range.

Author

Wang, Fenglin, Mao, Haijun, Chen, Xingyu, Li, Wei, Liu, Zhuofeng, Zhang, Weijun, and Bai, Shuxin

Abstract

In this work, A-site Nd doped BaTiO3 ceramics in the form of Ba1−xNd2x/3TiO3 with a wide substitution level range of x = 0–0.2 have been prepared via solid-state reaction method. Powder X-ray diffraction results reveal that Nd is completely incorporated into the BaTiO3 lattice in all specimens. Further analyses based on Rietveld refinement suggest that tetragonal and pseudo-cubic phases coexist in Ba1−xNd2x/3TiO3 ceramics with x ≤ 0.06, and the amount of tetragonal phase is raised with the increase of x value. When x value is larger than 0.08, only pseudo-cubic is observed. The generated V Ba ″ , Nd Ba · and V O · · defects, which are identified by X-ray photoelectron spectra, make the grain size displays a tendency of decrease first mainly due to the pining effect, and then increase ascribed to the accelerate of mass diffuse. By introducing such wide range of substitution level, Ba1−xNd2x/3TiO3 ceramics with colossal dielectric constant (x = 0.08), temperature-stable dielectric properties (x = 0.15), especially relaxor behavior (x = 0.20) noticed for the first time, are, respectively, received, which is closely related to the variation of phases and defects induced by the addition of Nd. This study may provide a special idea to modify BaTiO3 to satisfy diversified applications by single element with a wide doping range, and could lay the foundation of future works focusing on the various potential applications of Ba1−xNd2x/3TiO3 ceramics. [ABSTRACT FROM AUTHOR]

Published
2023
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140. Quasi-static and impact-initiated response of Zr55Ni5Al10Cu30 alloy

Author

Bai Shuxin, Shun Li, and Caimin Huang

Subjects
010302 applied physics, Amorphous metal, Materials science, Scanning electron microscope, Alloy, Metallurgy, 02 engineering and technology, Electron microprobe, engineering.material, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Microstructure, 01 natural sciences, Casting, Electronic, Optical and Magnetic Materials, Amorphous solid, 0103 physical sciences, Materials Chemistry, Ceramics and Composites, engineering, 0210 nano-technology, Ballistic impact
Abstract

The Zr55Ni5Al10Cu30 alloy was prepared by copper-mold casting method. The microstructure of the alloy was examined by integrating the X-ray diffraction, scanning electron microscope and electron probe microanalyzer. It was found that the alloy cast in the mold with 3 mm in diameter contains amorphous and Cu10Zr7 phases, while the alloys cast in the mold with 6 (D6) and 10 mm in diameter consist of Cu10Zr7, CuZr2 crystalline and amorphous phases. The quasi-static experiment result shows that the compressive fracture strength of D6 is up to 1560 MPa. Moreover, it was found that the Zr55Ni5Al10Cu30 alloy burned completely in air based on the evolution of bright spark during ballistic impact testing. The obviously reaming effect to impact target indicates that the Zr55Ni5Al10Cu30 alloy has a promising application in reactive material.

Published
2018

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